CN115920828A - Magnetic lanthanum-based adsorbent, preparation method thereof and method for enriching phosphorus in water body - Google Patents
Magnetic lanthanum-based adsorbent, preparation method thereof and method for enriching phosphorus in water body Download PDFInfo
- Publication number
- CN115920828A CN115920828A CN202310014933.5A CN202310014933A CN115920828A CN 115920828 A CN115920828 A CN 115920828A CN 202310014933 A CN202310014933 A CN 202310014933A CN 115920828 A CN115920828 A CN 115920828A
- Authority
- CN
- China
- Prior art keywords
- magnetic
- lanthanum
- phosphorus
- based adsorbent
- water body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910052746 lanthanum Inorganic materials 0.000 title claims abstract description 141
- 239000003463 adsorbent Substances 0.000 title claims abstract description 136
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 title claims abstract description 135
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 133
- 239000011574 phosphorus Substances 0.000 title claims abstract description 133
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 133
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 55
- 238000001179 sorption measurement Methods 0.000 claims abstract description 48
- 239000002244 precipitate Substances 0.000 claims abstract description 40
- 239000007787 solid Substances 0.000 claims abstract description 40
- 239000007900 aqueous suspension Substances 0.000 claims abstract description 34
- 238000003795 desorption Methods 0.000 claims abstract description 32
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 238000000926 separation method Methods 0.000 claims abstract description 19
- 150000002603 lanthanum Chemical class 0.000 claims abstract description 18
- 238000005406 washing Methods 0.000 claims abstract description 16
- 238000004321 preservation Methods 0.000 claims abstract description 15
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 48
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 36
- 238000007885 magnetic separation Methods 0.000 claims description 19
- 229920001223 polyethylene glycol Polymers 0.000 claims description 19
- 239000002202 Polyethylene glycol Substances 0.000 claims description 18
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 15
- ICAKDTKJOYSXGC-UHFFFAOYSA-K lanthanum(iii) chloride Chemical compound Cl[La](Cl)Cl ICAKDTKJOYSXGC-UHFFFAOYSA-K 0.000 claims description 14
- 239000012535 impurity Substances 0.000 claims description 9
- 238000001354 calcination Methods 0.000 claims description 8
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 claims description 6
- 239000004021 humic acid Substances 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 6
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 4
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 4
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 4
- 239000001509 sodium citrate Substances 0.000 claims description 4
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- FYDKNKUEBJQCCN-UHFFFAOYSA-N lanthanum(3+);trinitrate Chemical compound [La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FYDKNKUEBJQCCN-UHFFFAOYSA-N 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- 229960001484 edetic acid Drugs 0.000 claims description 2
- 238000011534 incubation Methods 0.000 claims 1
- 239000002594 sorbent Substances 0.000 claims 1
- 238000004065 wastewater treatment Methods 0.000 abstract description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 22
- 230000000694 effects Effects 0.000 description 20
- 239000000243 solution Substances 0.000 description 20
- 238000003756 stirring Methods 0.000 description 18
- 239000008367 deionised water Substances 0.000 description 11
- 229910021641 deionized water Inorganic materials 0.000 description 11
- 230000007935 neutral effect Effects 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 238000009210 therapy by ultrasound Methods 0.000 description 11
- YXEUGTSPQFTXTR-UHFFFAOYSA-K lanthanum(3+);trihydroxide Chemical compound [OH-].[OH-].[OH-].[La+3] YXEUGTSPQFTXTR-UHFFFAOYSA-K 0.000 description 9
- -1 lanthanum ions Chemical class 0.000 description 7
- 239000002351 wastewater Substances 0.000 description 7
- 239000002585 base Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003657 drainage water Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000012851 eutrophication Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- CZMAIROVPAYCMU-UHFFFAOYSA-N lanthanum(3+) Chemical compound [La+3] CZMAIROVPAYCMU-UHFFFAOYSA-N 0.000 description 2
- 239000008239 natural water Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000012258 stirred mixture Substances 0.000 description 2
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 description 1
- CKMXBZGNNVIXHC-UHFFFAOYSA-L ammonium magnesium phosphate hexahydrate Chemical compound [NH4+].O.O.O.O.O.O.[Mg+2].[O-]P([O-])([O-])=O CKMXBZGNNVIXHC-UHFFFAOYSA-L 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 125000003827 glycol group Chemical group 0.000 description 1
- NNLJGFCRHBKPPJ-UHFFFAOYSA-N iron lanthanum Chemical compound [Fe].[La] NNLJGFCRHBKPPJ-UHFFFAOYSA-N 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- DJFBJKSMACBYBD-UHFFFAOYSA-N phosphane;hydrate Chemical compound O.P DJFBJKSMACBYBD-UHFFFAOYSA-N 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 1
- 229940057847 polyethylene glycol 600 Drugs 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- 229910052567 struvite Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Images
Abstract
The invention provides a magnetic lanthanum-based adsorbent, a preparation method thereof and a method for enriching phosphorus in a water body, belonging to the technical field of adsorbent preparation and wastewater treatment, wherein the method for preparing the magnetic lanthanum-based adsorbent comprises the following steps: containing gamma-Fe with magnetic property 2 O 3 Adding a cross-linking agent and a water-soluble lanthanum salt into the aqueous suspension, adjusting the pH value to be alkaline, carrying out heat preservation reaction for a period of time, collecting solid precipitates, washing with water, and roasting to obtain the magnetic lanthanum-based adsorbent. The disclosure also provides a method for enriching phosphorus in a water body by using a magnetic lanthanum-based adsorbent, which comprises the following steps: magnetic lanthanum-based adsorbentAdding into a phosphorus-containing water body for adsorption; after the magnetic lanthanum-based adsorbent is adsorbed and saturated, carrying out solid-liquid separation, eluting phosphorus on the magnetic lanthanum-based adsorbent by using a desorption agent, and collecting desorption liquid; adding the desorbed magnetic lanthanum-based adsorbent into the phosphorus-containing water again for adsorption, and enriching the phosphorus in the water into desorption solution in such a reciprocating way; wherein the total phosphorus concentration in the phosphorus-containing water body is 0.3-10 mg/L.
Description
Technical Field
The disclosure belongs to the technical field of adsorbent preparation and wastewater treatment, and particularly relates to a method for preparing a magnetic lanthanum-based adsorbent and a method for enriching phosphorus in a water body, and more particularly relates to a method for preparing a magnetic lanthanum-based adsorbent, a magnetic lanthanum-based adsorbent and a method for enriching phosphorus in a water body by using the magnetic lanthanum-based adsorbent.
Background
The problem of water quality reduction caused by water eutrophication is the most common global water pollution problem, and the excessive phosphorus intake is the main reason for water eutrophication. In addition, phosphorus is an indispensable nutrient element for life, and as a scarce non-renewable resource, how to realize the recycling of phosphorus resources is also an urgent problem to be solved.
The existing water phosphorus recovery technology is mainly based on a struvite precipitation method and a crystallization principle. The applicable scene of the phosphorus recovery process is mainly concentrated on the anaerobic process of a sewage treatment plant or tail water of a sludge anaerobic digestion unit, and the requirement on the concentration of a phosphorus solution is 60-300mg P/L. However, these phosphorus recovery processes currently suffer from several drawbacks, such as: the method is limited by application scenes, the yield of sludge in the wastewater to be treated is large, the treatment cost is high, the phosphorus recovery efficiency is low, and the like, and part of chemical reagents added in the treatment process can easily cause scaling and blockage of process pipelines, so that the continuous use of the process pipelines is influenced. If the technical processes are applied to the treatment of low-concentration phosphorus-containing wastewater (such as TP is less than or equal to 10mg P/L), the problem of unsatisfactory treatment effect caused by the loss of a large amount of phosphorus often exists, so that the treatment of the low-concentration phosphorus-containing water body cannot be realized.
Disclosure of Invention
In order to solve the technical problems, the disclosure provides a magnetic lanthanum-based adsorbent, a preparation method thereof and a method for enriching phosphorus in a water body, so as to at least partially solve the technical problems.
In order to solve the technical problem, the technical scheme provided by the disclosure is as follows:
as a first aspect of the present disclosure, there is provided a method of preparing a magnetic lanthanum-based adsorbent, comprising:
containing gamma-Fe with magnetic property 2 O 3 Adding a cross-linking agent and a water-soluble lanthanum salt into the aqueous suspension, adjusting the pH value to be alkaline, carrying out heat preservation reaction for a period of time, collecting solid precipitates, washing with water, and roasting to obtain the magnetic lanthanum-based adsorbent.
In one embodiment, wherein:
magnetic gamma-Fe 2 O 3 The mol ratio of the water-soluble lanthanum salt to the water-soluble lanthanum salt is 1:0.5-1: 4;
the water soluble lanthanum salt comprises at least one of: lanthanum chloride, lanthanum nitrate;
the addition amount of the cross-linking agent is gamma-Fe containing magnetism 2 O 3 0.1-1% of the volume of the aqueous suspension;
the crosslinking agent includes any one of the following:
polyethylene glycol, ethylenediamine, sodium citrate and ethylene diamine tetraacetic acid.
In one embodiment, wherein:
adjusting the pH to alkaline comprises adjusting the pH to 10-12 with a base;
the base comprises: at least one of sodium hydroxide, potassium hydroxide and ammonia water.
In one embodiment, wherein:
the temperature for heat preservation is 50-60 ℃;
the reaction time is kept at 8-12 h.
In one embodiment, wherein:
the parameters of the magnetic lanthanum-based adsorbent prepared by roasting comprise:
the roasting temperature is 90-250 ℃;
the roasting time is 5-24h.
As a second aspect of the present disclosure, there is provided a magnetic lanthanum-based adsorbent, which is prepared by the method of preparing the magnetic lanthanum-based adsorbent in the above-described example.
As a third aspect of the present disclosure, there is provided a method for enriching phosphorus in a water body using a magnetic lanthanum-based adsorbent, comprising:
adding a magnetic lanthanum-based adsorbent into a phosphorus-containing water body for adsorption;
after the magnetic lanthanum-based adsorbent is adsorbed and saturated, carrying out solid-liquid separation, eluting phosphorus on the magnetic lanthanum-based adsorbent by using a desorption agent, and collecting desorption liquid;
adding the desorbed magnetic lanthanum-based adsorbent into the phosphorus-containing water again for adsorption, and enriching the phosphorus in the water into desorption solution in such a reciprocating way;
wherein, the total phosphorus concentration in the phosphorus-containing water body is 0.3-10 mg/L;
wherein the magnetic lanthanum-based adsorbent is the magnetic lanthanum-based adsorbent prepared by the method in the above example.
In one embodiment, the desorbent comprises at least one of NaOH, naCl;
the concentration of NaOH is 1-1.25 mol/L;
the concentration of NaCl is 0-1.875 mol/L;
the desorption time is 2-6h.
In one embodiment, the pH value of the phosphorus-containing water body is 2-12;
impurities in the phosphorus-containing water body include: cl - 、NO 3 - 、HCO 3 - 、Ca 2+ 、Mg 2+ And at least one of humic acid.
In one embodiment, the solid-liquid separation mode comprises at least one of super magnetic separation and electromagnetic separation.
Based on the technical scheme, the method for preparing the magnetic lanthanum-based adsorbent and the method for enriching phosphorus in the water body provided by the disclosure at least have one of the following beneficial effects:
(1) According to the embodiment of the disclosure, the magnetic gamma-Fe is added 2 O 3 Adding cross-linking agent and water-soluble lanthanum salt into the aqueous suspension, and using the cross-linking agent to make the magnetic gamma-Fe-contained in the aqueous suspension 2 O 3 And lanthanum ions in aqueous solution, and magnetic gamma-Fe 2 O 3 Form stable chemical bond with lanthanum ion to make magnetic gamma-Fe 2 O 3 And lanthanum ions are connected with each other to form a net structure; then, the pH of the solution is adjusted to be alkaline, and lanthanum is separatedConverting the ion into lanthanum hydroxide with stable structure to form magnetic gamma-Fe 2 O 3 And a lanthanum hydroxide complex. And roasting to obtain the magnetic lanthanum-based adsorbent with a stable structure.
(2) According to the embodiment of the disclosure, the magnetic lanthanum-based adsorbent is added into the phosphorus-containing wastewater, and the strong adsorption capacity of lanthanum hydroxide in the magnetic lanthanum-based adsorbent to phosphorus is utilized, so that the phosphorus in the water body can be adsorbed, the enrichment of phosphorus is realized, and the phosphorus removal effect is higher. The magnetic lanthanum-based adsorbent after adsorbing phosphorus is subjected to magnetic solid-liquid separation and then subjected to desorption treatment, so that the magnetic lanthanum-based adsorbent can be regenerated. The desorbed magnetic lanthanum-based adsorbent is re-added into the phosphorus-containing water body, so that the enrichment of phosphorus in the water body can be realized again. In addition, the magnetic lanthanum-based adsorbent provided by the disclosure has strong structural stability and adsorption stability, can perform continuous multiple adsorption-desorption cycles in the phosphorus-containing wastewater treatment process, and still has high capacity of enriching phosphorus in a water body after multiple cycles.
(3) According to the embodiment of the disclosure, the magnetic lanthanum-based adsorbent provided by the disclosure has wide application range to different pH values and has stronger specific adsorption capacity to phosphorus.
Drawings
FIG. 1 is a schematic flow chart of a process for enriching phosphorus in a water body using a magnetic lanthanum-based adsorbent in an embodiment of the present disclosure;
FIG. 2 is a graph showing the adsorption effect of magnetic lanthanum-based adsorbents prepared at different calcination temperatures on phosphorus-containing water according to the embodiment of the present disclosure;
FIG. 3 is a graph showing the adsorption effect of magnetic lanthanum-based adsorbents prepared by using different cross-linking agents on phosphorus-containing water according to the embodiment of the present disclosure;
FIG. 4 is a graph comparing the effect of the magnetic lanthanum-based adsorbent in example 2 of the present disclosure on the enrichment of phosphorus in phosphorus-containing water at different pH values;
fig. 5 is a comparison graph of the effect of the magnetic lanthanum-based adsorbent in the presence of coexisting ions in the phosphorus-containing water body for phosphorus enrichment in example 2 of the present disclosure.
Detailed Description
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
Aiming at the problem that the treatment effect of low-concentration phosphorus-containing wastewater is poor due to phosphorus loss in the process of treating the low-concentration phosphorus-containing wastewater in the related technology, the disclosure provides a magnetic lanthanum-based adsorbent, a preparation method thereof and a method for enriching phosphorus in a water body, so that the enrichment of phosphorus in the low-concentration phosphorus-containing wastewater is realized through the magnetic lanthanum-based adsorbent, and a higher phosphorus removal effect is realized.
In view of the above, as a first aspect of the present disclosure, there is provided a method for preparing a magnetic lanthanum-based adsorbent, comprising:
containing gamma-Fe with magnetic property 2 O 3 Adding a cross-linking agent and a water-soluble lanthanum salt into the aqueous suspension, adjusting the pH value to be alkaline, carrying out heat preservation reaction for a period of time, collecting solid precipitates, washing with water, and roasting to obtain the magnetic lanthanum-based adsorbent. Those skilled in the art will appreciate that the magnetic material may contain gamma-Fe 2 O 3 Adding cross-linking agent and water-soluble lanthanum salt into the aqueous suspension, and using the cross-linking agent to make the magnetic gamma-Fe-contained in the aqueous suspension 2 O 3 And lanthanum ions in aqueous solution, and magnetic gamma-Fe 2 O 3 Form stable iron-lanthanum chemical bond with lanthanum ions to ensure that the magnetic gamma-Fe 2 O 3 And lanthanum ions are connected with each other to form a network structure. Then, the pH value of the solution is adjusted to be alkaline, lanthanum ions are converted into lanthanum hydroxide with stable structure, and magnetic gamma-Fe is formed 2 O 3 And a lanthanum hydroxide complex. And roasting to obtain the magnetic lanthanum-based adsorbent with a stable structure.
Magnetic gamma-Fe according to embodiments of the present disclosure 2 O 3 And water-soluble lanthanum salt in a molar ratio of 1:0.5-1:4, wherein, the magnetic gamma-Fe 2 O 3 For commercial products, the water-soluble lanthanum salt comprises at least one of: lanthanum chloride and lanthanum nitrate. The magnetic lanthanum-based adsorbent prepared in the proportion range provided by the disclosure has higher adsorption capacity when adsorbing pollutants, and simultaneously has higher magnetic separation efficiency in the desorption process, and the magnetic lanthanum-based adsorbent has higher magnetic separation efficiencyThe pollutant may be a phosphorus-containing water body.
According to the embodiment of the disclosure, the addition amount of the cross-linking agent is magnetic gamma-Fe 2 O 3 0.1-1% of the volume of the aqueous suspension. As will be understood by those skilled in the art, e.g., magnetic gamma-Fe is included 2 O 3 When the volume of the aqueous suspension is 100mL, the dosage of the added cross-linking agent is 0.1-1mL, and the magnetic gamma-Fe is in the range 2 O 3 Certain adsorption sites are still reserved in the process of forming a net shape by crosslinking with water-soluble lanthanum salt, so that the prepared magnetic adsorbent has higher adsorption performance.
According to an embodiment of the present disclosure, the cross-linking agent includes any one of polyethylene glycol, ethylenediamine, sodium citrate, and disodium ethylenediamine tetraacetic acid, wherein the cross-linking agent is preferably polyethylene glycol, which is presumed to be due to the fact that the optional cross-linking agents have partial positive charge groups and partial negative charge groups, and the negative charge groups have a certain repulsion effect on phosphate groups in subsequent phosphorus-containing wastewater treatment, so as to influence phosphorus enrichment. In the case of polyethylene glycol, the molecular chain is longer, and multiple sites can be provided for lanthanum salt and magnetic gamma-Fe 2 O 3 The properties of the mutually cross-linked polyethylene glycol groups are mild, thereby facilitating the lanthanum salt and the magnetic gamma-Fe 2 O 3 And (4) phase crosslinking. The polyethylene glycol selected in the embodiments of the present disclosure may be polyethylene glycol 124, polyethylene glycol 600, polyethylene glycol 2000, or the like.
According to an embodiment of the present disclosure, adjusting the pH to alkaline comprises: adjusting the pH value to 10-12 with alkali; the bases used therein include: at least one of sodium hydroxide, potassium hydroxide and ammonia water. Adjusting the pH value to be alkaline, and preserving the temperature for a period of time, wherein the temperature for preserving the temperature is 50-60 ℃; the reaction time is kept at 8-12 h.
In embodiments of the disclosure, the pH is adjusted to alkaline with a base to facilitate magnetic γ -Fe 2 O 3 Cross-linking with lanthanum salt to form lanthanum ion in net structure, and converting into lanthanum hydroxide with more stable structure to obtain magnetic gamma-Fe 2 O 3 And a lanthanum hydroxide compound to increase the structural stability of the prepared magnetic lanthanum-based adsorbent. By keeping the magnetic composite product warm for a period of timeThe intermediate treatment is beneficial to forming lanthanum hydroxide with a more complete crystal structure, and the adsorption capacity of the magnetic lanthanum-based adsorbent to phosphorus in the application process is improved.
According to the embodiment of the disclosure, the solid precipitate after heat preservation for a period of time is collected, washed with water to remove redundant alkali liquor in the solid precipitate, and then roasted to prepare the magnetic lanthanum-based adsorbent, wherein the parameters of the magnetic lanthanum-based adsorbent prepared by roasting include: the roasting temperature is 90-250 ℃, wherein the roasting temperature is more preferably 150-200 ℃; the calcination time is 5-24h, wherein the calcination time is more preferably 10-15h.
In the embodiment of the disclosure, the solid precipitate after washing with water is roasted, which is helpful for improving the stability of the crystal structure of lanthanum hydroxide, and the magnetic lanthanum-based composite can form a porous structure through roasting treatment, and other impurities in the porous structure can be burnt out, so that the adsorption sites on the surface of the magnetic lanthanum-based adsorbent are increased. If the calcination temperature is further increased based on the calcination temperature, the crosslinking agent polyethylene glycol in the precursor of the magnetic lanthanum-based composite may be charred, thereby affecting the crystalline integrity of lanthanum hydroxide in the magnetic lanthanum-based adsorbent.
According to an embodiment of the present disclosure, as a second aspect of the present disclosure, there is provided a magnetic lanthanum-based adsorbent produced by the above method.
According to an embodiment of the present disclosure, as a third aspect of the present disclosure, there is provided a method for enriching phosphorus in a water body using a magnetic lanthanum-based adsorbent.
Fig. 1 is a schematic flow chart of a method for enriching phosphorus in a water body by using a magnetic lanthanum-based adsorbent in the embodiment of the disclosure.
As shown in fig. 1, the method for enriching phosphorus in water by using magnetic lanthanum-based adsorbent comprises the following steps: adding a magnetic lanthanum-based adsorbent into a phosphorus-containing water body for adsorption; after the magnetic lanthanum-based adsorbent is adsorbed and saturated, carrying out magnetic solid-liquid separation, eluting phosphorus on the magnetic lanthanum-based adsorbent by using a desorption agent, and collecting desorption liquid; adding the desorbed magnetic lanthanum-based adsorbent into the phosphorus-containing water again for adsorption, and enriching the phosphorus in the water into desorption liquid in a reciprocating manner; wherein, the total phosphorus concentration in the phosphorus-containing water body is 0.3-10 mg/L, and the phosphorus-containing water body belongs to a low-concentration phosphorus-containing water body; the magnetic lanthanum-based adsorbent is prepared by adopting the method for preparing the magnetic lanthanum-based adsorbent provided in the embodiment.
According to the embodiment of the disclosure, the magnetic lanthanum-based adsorbent is added into the phosphorus-containing water body for adsorption, the amount of the added magnetic lanthanum-based adsorbent is 0.05-5 g/L, and the adsorption time is 0.5-5 hours, wherein the addition amount and the adsorption time of the magnetic lanthanum-based adsorbent can be determined according to the amount of the phosphorus-containing water body, the magnetic lanthanum-based adsorbent is detected to be saturated by the phosphorus-containing water body, and the magnetic lanthanum-based adsorbent is indicated to be saturated by adsorption when the content of phosphorus in the phosphorus-containing water body is not changed any more.
According to the embodiment of the disclosure, the magnetic lanthanum-based adsorbent after saturated adsorption is subjected to solid-liquid separation, and the solid-liquid separation mode comprises at least one of super-magnetic separation and electromagnetic separation, and mainly utilizes the principle of magnetic phase adsorption.
According to an embodiment of the present disclosure, the desorption of phosphorus on the magnetic lanthanum-based adsorbent is performed with a desorbent, wherein the desorbent comprises at least one of NaOH, naCl, wherein a combination of NaOH and NaCl is preferred. Wherein the concentration of NaOH is 1-1.25 mol/L; the concentration of NaCl is 0-1.875 mol/L; the desorption time is 2-6h.
In the embodiment of the disclosure, the magnetic lanthanum-based adsorbent is placed in the desorption agent to desorb phosphorus on the adsorbent, and the main principle of desorption is to utilize metal ions to compete for adsorption sites on the surface of the magnetic lanthanum-based adsorbent, so that the phosphorus is eluted from the magnetic lanthanum-based adsorbent, and a phosphorus-containing enrichment solution is obtained.
According to the embodiment of the disclosure, the magnetic lanthanum-based adsorbent treatment can be applied to the water body with the pH value of 2-12 of the phosphorus-containing water body, which shows that the magnetic lanthanum-based adsorbent is not limited by the acidity and alkalinity of the water body, and can realize multi-scenario application.
According to embodiments of the present disclosure, a magnetic lanthanum-based adsorbent comprises Cl - 、NO 3 - 、HCO 3 - 、Ca 2+ 、Mg 2+ In HA (humic acid)At least one impurity in the phosphorus-containing water can still maintain higher dephosphorization efficiency.
The technical solution of the present disclosure is further illustrated by the following specific embodiments and the accompanying drawings. It should be noted that the following specific examples are illustrative only, and the scope of the present disclosure is not limited thereto. The chemicals and raw materials used in the following examples were either commercially available or self-prepared by established methods of preparation.
1. Preparation of magnetic lanthanum-based adsorbent
Example 1
5mmol of gamma-Fe is taken 2 O 3 Performing ultrasonic treatment on ethanol and water for 10min respectively, performing magnetic separation, and pouring 80mL of deionized water to obtain magnetic gamma-Fe 2 O 3 The aqueous suspension of (a). Then, uniformly stirring the magnetic gamma-Fe 2 O 3 Adding 0.1% polyethylene glycol and 10mmol lanthanum chloride into the aqueous suspension, stirring at high speed (1000 rpm) to obtain a uniform state, adding NaOH solution to adjust the pH to be pH =10, and reacting at 50 ℃ for 8h to obtain a solid precipitate. And (3) washing the solid precipitate with water for several times until the pH value is neutral, pouring the solid precipitate into a crucible, and roasting for 12 hours at 90 ℃ to obtain the magnetic lanthanum-based adsorbent.
Example 2
5mmol of gamma-Fe is taken 2 O 3 Performing ultrasonic treatment on ethanol and water for 10min respectively, performing magnetic separation, and pouring 80mL of deionized water to obtain magnetic gamma-Fe 2 O 3 The aqueous suspension of (a). Then, magnetic gamma-Fe is added to the uniformly stirred mixture 2 O 3 0.3% of polyethylene glycol and 7.5mmol of lanthanum chloride are added into the aqueous suspension, and after stirring at a high speed (1000 rpm) to a uniform state, KOH solution is added to adjust the pH to be pH =11, and the mixture is reacted at 60 ℃ for 9 hours with heat preservation to obtain a solid precipitate. And (3) washing the solid precipitate with water for several times until the pH value is neutral, pouring the solid precipitate into a crucible, and roasting for 12h at the temperature of 150 ℃ to obtain the magnetic lanthanum-based adsorbent.
Example 3
5mmol of gamma-Fe is taken 2 O 3 Performing ultrasonic treatment on ethanol and water for 10min respectively, performing magnetic separation, and pouring 80mL of deionized water to obtain magnetic gamma-Fe 2 O 3 The aqueous suspension of (a). Then, uniformly stirring the magnetic gamma-Fe 2 O 3 Adding 0.6% polyethylene glycol and 10mmol lanthanum chloride into the aqueous suspension, stirring at high speed (1000 rpm) to obtain a uniform state, adding ammonia water to adjust the pH of the solution to be pH =12, and carrying out heat preservation reaction at 60 ℃ for 10 hours to obtain a solid precipitate. And then washing the solid precipitate with water for several times until the pH value is neutral, pouring the solid precipitate into a crucible, and roasting for 12 hours at 200 ℃ to obtain the magnetic lanthanum-based adsorbent.
Example 4
5mmol of gamma-Fe is taken 2 O 3 Performing ultrasonic treatment on ethanol and water for 10min respectively, performing magnetic separation, and pouring 80mL of deionized water to obtain magnetic gamma-Fe 2 O 3 The aqueous suspension of (a). Then, uniformly stirring the magnetic gamma-Fe 2 O 3 Adding 1% polyethylene glycol and 20mmol lanthanum chloride into the aqueous suspension, stirring at a high speed (1000 rpm) to be in a uniform state, adding a mixed solution of NaOH and KOH to adjust the pH of the solution to be pH =12, and carrying out heat preservation reaction at 60 ℃ for 10 hours to obtain a solid precipitate. And (3) washing the solid precipitate with water for several times until the pH value is neutral, pouring the solid precipitate into a crucible, and roasting for 12 hours at the temperature of 250 ℃ to obtain the magnetic lanthanum-based adsorbent.
Example 5
5mmol of gamma-Fe is taken 2 O 3 Respectively performing ultrasonic treatment on ethanol and water for 10min, performing magnetic separation, and pouring 80mL of deionized water to obtain magnetic gamma-Fe 2 O 3 The aqueous suspension of (a). Then, magnetic gamma-Fe is added to the uniformly stirred mixture 2 O 3 0.3% of polyethylene glycol and 7.5mmol of lanthanum chloride are added into the aqueous suspension, and after stirring at a high speed (1000 rpm) to a uniform state, KOH solution is added to adjust the pH to be pH =12, and the mixture is reacted at 60 ℃ for 9 hours with heat preservation to obtain a solid precipitate. And (3) washing the solid precipitate with water for several times until the pH value is neutral, pouring the solid precipitate into a crucible, and roasting for 12 hours at 90 ℃ to obtain the magnetic lanthanum-based adsorbent.
Example 6
5mmol of gamma-Fe is taken 2 O 3 Respectively performing ultrasonic treatment on ethanol and water for 10min, performing magnetic separation, and pouring 80mL of deionized water to obtain magnetic gamma-Fe 2 O 3 The aqueous suspension of (a). Then, the magnetic flux is uniformly stirredgamma-Fe of nature 2 O 3 Adding 0.3% polyethylene glycol and 7.5mmol lanthanum chloride into the aqueous suspension, stirring at a high speed (1000 rpm) to a uniform state, adding KOH solution to adjust the pH to be 12 = pH, and carrying out heat preservation reaction at 60 ℃ for 9 hours to obtain a solid precipitate. And (3) washing the solid precipitate with water for several times until the pH value is neutral, pouring the solid precipitate into a crucible, and roasting for 12h at 120 ℃ to obtain the magnetic lanthanum-based adsorbent.
Example 7
5mmol of gamma-Fe is taken 2 O 3 Performing ultrasonic treatment on ethanol and water for 10min respectively, performing magnetic separation, and pouring 80mL of deionized water to obtain magnetic gamma-Fe 2 O 3 The aqueous suspension of (a). Then, uniformly stirring the magnetic gamma-Fe 2 O 3 0.3% of polyethylene glycol and 7.5mmol of lanthanum chloride are added into the aqueous suspension, and after stirring at a high speed (1000 rpm) to a uniform state, KOH solution is added to adjust the pH to be pH =12, and the mixture is reacted at 60 ℃ for 9 hours with heat preservation to obtain a solid precipitate. And (3) washing the solid precipitate with water for several times until the pH value is neutral, pouring the solid precipitate into a crucible, and roasting for 12h at 200 ℃ to obtain the magnetic lanthanum-based adsorbent.
Example 8
5mmol of gamma-Fe is taken 2 O 3 Performing ultrasonic treatment on ethanol and water for 10min respectively, performing magnetic separation, and pouring 80mL of deionized water to obtain magnetic gamma-Fe 2 O 3 The aqueous suspension of (a). Then, uniformly stirring the magnetic gamma-Fe 2 O 3 0.3% of polyethylene glycol and 7.5mmol of lanthanum chloride are added into the aqueous suspension, and after stirring at a high speed (1000 rpm) to a uniform state, KOH solution is added to adjust the pH to be pH =12, and the mixture is reacted at 60 ℃ for 9 hours with heat preservation to obtain a solid precipitate. And (3) washing the solid precipitate with water for several times until the pH value is neutral, pouring the solid precipitate into a crucible, and roasting for 12 hours at the temperature of 250 ℃ to obtain the magnetic lanthanum-based adsorbent.
Fig. 2 is a diagram illustrating an adsorption effect of the magnetic lanthanum-based adsorbent prepared at different calcination temperatures on a phosphorus-containing water body in the embodiment of the present disclosure.
As shown in fig. 2, the magnetic lanthanum-based adsorbent (example 2) prepared by calcination at 150 ℃ has a higher phosphorus-containing adsorption capacity on the phosphorus-containing water body, and it is hypothesized that at this temperature, the magnetic lanthanum-based adsorbent forms a porous structure, has fewer impurities in pores and larger pore diameter and specific surface area, and provides more adsorption sites for phosphorus-containing water body adsorption.
Example 9
5mmol of gamma-Fe is taken 2 O 3 Performing ultrasonic treatment on ethanol and water for 10min respectively, performing magnetic separation, and pouring 80mL of deionized water to obtain magnetic gamma-Fe 2 O 3 The aqueous suspension of (a). Then, uniformly stirring the magnetic gamma-Fe 2 O 3 0.3% of ethylenediamine and 7.5mmol of lanthanum chloride were added to the aqueous suspension, and after stirring at a high speed (1000 rpm) until a uniform state was obtained, a KOH solution was added to adjust the pH to pH =12, and the reaction was carried out at 60 ℃ for 9 hours to obtain a solid precipitate. And (3) washing the solid precipitate with water for several times until the pH value is neutral, pouring the solid precipitate into a crucible, and roasting for 12h at the temperature of 150 ℃ to obtain the magnetic lanthanum-based adsorbent.
Example 10
5mmol of gamma-Fe is taken 2 O 3 Performing ultrasonic treatment on ethanol and water for 10min respectively, performing magnetic separation, and pouring 80mL of deionized water to obtain magnetic gamma-Fe 2 O 3 The aqueous suspension of (a). Then, uniformly stirring the magnetic gamma-Fe 2 O 3 Adding 0.3% of disodium ethylene diamine tetraacetate and 7.5mmol of lanthanum chloride into the aqueous suspension, stirring at a high speed (1000 rpm) to be in a uniform state, adding KOH solution to adjust the pH value to be =12, and carrying out heat preservation reaction at 60 ℃ for 9 hours to obtain a solid precipitate. And (3) washing the solid precipitate with water for several times until the pH value is neutral, pouring the solid precipitate into a crucible, and roasting for 12 hours at the temperature of 150 ℃ to obtain the magnetic lanthanum-based adsorbent.
Example 11
5mmol of gamma-Fe is taken 2 O 3 Performing ultrasonic treatment on ethanol and water for 10min respectively, performing magnetic separation, and pouring 80mL of deionized water to obtain magnetic gamma-Fe 2 O 3 The aqueous suspension of (a). Then, uniformly stirring the magnetic gamma-Fe 2 O 3 The aqueous suspension of (a) was added with 0.3% sodium citrate and 7.5mmol lanthanum chloride, stirred at high speed (1000 rpm) to a uniform state, added with KOH solution to adjust pH to =12, and reacted at 60 ℃ for 9 hours with heat preservation to obtain a solid precipitate. Washing the solid precipitate with water several times until the pH is neutral, pouring the solid precipitate into a crucible, maintaining at 150 deg.CAnd roasting for 12 hours to obtain the magnetic lanthanum-based adsorbent.
Fig. 3 is a diagram illustrating an adsorption effect of a magnetic lanthanum-based adsorbent prepared by using different cross-linking agents on a phosphorus-containing water body in an embodiment of the present disclosure.
As shown in fig. 3, the magnetic lanthanum-based adsorbent prepared by the method of the present disclosure has a high phosphorus-containing adsorption amount even without using a cross-linking agent due to the use of polyethylene glycol PEG as a cross-linking agent, wherein the blank group is that no cross-linking agent is added.
2. Phosphorus-containing water body enriched by magnetic lanthanum-based adsorbent
Application example 1
0.05g/L of the magnetic lanthanum-based adsorbent in the embodiment 1 is added into natural phosphorus-containing water with the initial concentration of 0.3mg P/L for adsorption for 0.5h, after the adsorption is saturated, a super-magnetic system is used for carrying out magnetic solid-liquid separation, 1mol/L of NaOH desorbent is used for desorbing the phosphorus-containing magnetic lanthanum-based adsorbent, the desorption is carried out for 2h at the temperature of 30 ℃, the magnetic lanthanum-based adsorbent after the super-magnetic separation is added into the phosphorus-containing water again after the desorption, the operation is repeated for 10 cycles in the same way, the phosphorus in the natural water is enriched into the desorption solution, and the specific enrichment effect is shown in Table 1.
Application example 2
Adding 1g/L of the magnetic lanthanum-based adsorbent in the embodiment 2 into natural phosphorus-containing water with the initial concentration of 2mg P/L for adsorption for 4h, carrying out magnetic solid-liquid separation through a super magnetic system after the adsorption is saturated, desorbing the phosphorus-containing magnetic lanthanum-based adsorbent by adopting a desorption agent mixed by 2mol/L NaOH and 1mol/L NaCl, desorbing for 4h at the temperature of 60 ℃, adding the magnetic lanthanum-based adsorbent subjected to the super magnetic separation into the phosphorus-containing water again after the desorption, and repeating the cycle for 10 cycles in such a way, so that the phosphorus in the natural water is enriched into the desorption liquid, wherein the specific enrichment effect is shown in Table 1.
Application example 3
Adding 2g/L of the magnetic lanthanum-based adsorbent in example 3 into domestic phosphorus-containing sewage with the initial concentration of 5mg P/L for adsorption for 4h, carrying out magnetic solid-liquid separation by an electromagnetic system after the adsorption is saturated, desorbing the phosphorus-containing magnetic lanthanum-based adsorbent by adopting a mixed desorbent of 2.5mol/L NaOH and 1.875mol/L NaCl, keeping the temperature at 40 ℃ for 4h, adding the magnetically separated magnetic lanthanum-based adsorbent into the phosphorus-containing water again after the desorption, and repeating the cycle for 10 cycles in such a way, wherein phosphorus in the domestic sewage is enriched into the desorption solution, and the specific enrichment effect is shown in Table 1.
Application example 4
Adding 5g/L of the magnetic lanthanum-based adsorbent in the embodiment 4 into industrial phosphorus-containing drainage water with the initial concentration of 10mg P/L for adsorption for 5h, carrying out magnetic solid-liquid separation through an electromagnetic system after the adsorption is saturated, adopting 2mol/L of NaOH desorbent for desorption of the phosphorus-containing magnetic lanthanum-based adsorbent, desorbing for 6h at the temperature of 80 ℃, adding the magnetic lanthanum-based adsorbent subjected to electromagnetic separation into a phosphorus-containing water body again after the desorption, repeating for 10 cycles in the above manner, enriching phosphorus in the industrial drainage water into desorption liquid, and specifically enriching the effect as shown in Table 1.
TABLE 1 comparison of phosphorus enrichment results using different magnetic lanthanum-based adsorbents from examples 1-4
As shown in table 1, the magnetic lanthanum-based adsorbents provided in embodiments 1 to 4 of the present disclosure have high adsorption performance, magnetic separation efficiency, and desorption performance for different phosphorus-containing water bodies, and can realize enrichment of phosphorus in different phosphorus-containing water bodies.
Application example 5
The magnetic lanthanum-based adsorbent in example 2 was added to phosphorus-containing water bodies with different pH values and initial concentrations of 10mg P/L for 12h of adsorption, after saturation of adsorption, magnetic solid-liquid separation was performed by a supermagnetic system, and the effect of the magnetic lanthanum-based adsorbent on the amount of phosphorus adsorbed by the magnetic lanthanum-based adsorbent at different pH values was tested as shown in fig. 4.
As shown in fig. 4, the magnetic lanthanum-based adsorbent provided in example 2 can adsorb phosphorus-containing water bodies with different pH values and has a good phosphorus removal effect, wherein especially phosphorus-containing water bodies with pH =2-9 have a high adsorption capacity, and even in a strongly alkaline environment with strong alkalinity, the magnetic lanthanum-based adsorbent provided by the present disclosure can treat wastewater with different scenes, and has a wide pH application range.
Application example 6
The magnetic lanthanum-based adsorbent in example 2 was added to a phosphorus-containing water body (10 mg P/L) containing different impurities for 12h of adsorption, after saturation of adsorption, magnetic solid-liquid separation was performed by a supermagnetic system, and the effect of the magnetic lanthanum-based adsorbent of different impurities on the amount of phosphorus adsorption was tested as shown in fig. 5.
As shown in fig. 5, the dotted line in fig. 5 indicates that when the water body only contains phosphate ions, the magnetic lanthanum-based adsorbent in example 2 can achieve a phosphorus adsorption amount of 65mg/g for the phosphorus-containing water body. After different impurities are added into the phosphorus-containing water body, part of the impurities interfere the phosphorus-enriching performance of the magnetic lanthanum-based adsorbent to a certain extent, so that the phosphorus-enriching effect of the magnetic lanthanum-based adsorbent is slightly reduced, such as Cl - 、NO 3 - 、HCO 3 - 、Mg 2+ HA (humic acid), etc.; but for the content of Ca 2+ For the phosphorus-containing water body, when the magnetic lanthanum-based adsorbent is used for enrichment, a Ca-P-La compound is possibly formed in the adsorbent, so that the effect of enriching phosphorus by the adsorbent is enhanced. It is also illustrated by fig. 5 that the magnetic lanthanum-based adsorbents provided by the present disclosure have a strong specific adsorption capacity for phosphorus.
The above-described embodiments, objects, technical solutions and advantages of the present disclosure are further described in detail, it should be understood that the above-described embodiments are only examples of the present disclosure, and should not be construed as limiting the present disclosure, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. A method of preparing a magnetic lanthanum-based adsorbent comprising:
containing gamma-Fe with magnetic property 2 O 3 Adding a cross-linking agent and a water-soluble lanthanum salt into the aqueous suspension, adjusting the pH value to be alkaline, carrying out heat preservation reaction for a period of time, collecting solid precipitates, washing with water, and roasting to obtain the magnetic lanthanum-based adsorbent.
2. The method of claim 1, wherein the magnetic γ -Fe 2 O 3 The mol ratio of the water-soluble lanthanum salt to the water-soluble lanthanum salt is 1:0.5-1: 4;
wherein the water-soluble lanthanum salt comprises at least one of: lanthanum chloride, lanthanum nitrate;
wherein the addition amount of the cross-linking agent is the magnetic gamma-Fe 2 O 3 0.1-1% of the volume of the aqueous suspension;
the crosslinking agent comprises any one of the following substances:
polyethylene glycol, ethylenediamine, sodium citrate and ethylene diamine tetraacetic acid.
3. The method of claim 1, wherein the adjusting the pH to alkaline comprises adjusting the pH to 10-12 with a base;
the base comprises: at least one of sodium hydroxide, potassium hydroxide and ammonia water.
4. The method of claim 1, wherein the temperature of the incubation is 50-60 ℃; the reaction time is kept at 8-12 h.
5. The method of claim 1, wherein the parameters for calcining to produce the magnetic lanthanum-based sorbent comprise:
the roasting temperature is 90-250 ℃;
the roasting time is 5-24h.
6. A magnetic lanthanum-based adsorbent prepared by the method of any of claims 1-5.
7. A method for enriching phosphorus in a water body by using a magnetic lanthanum-based adsorbent comprises the following steps:
adding a magnetic lanthanum-based adsorbent into a phosphorus-containing water body for adsorption;
after the magnetic lanthanum-based adsorbent is adsorbed and saturated, carrying out solid-liquid separation, eluting phosphorus on the magnetic lanthanum-based adsorbent by using a desorption agent, and collecting desorption liquid;
adding the desorbed magnetic lanthanum-based adsorbent into a phosphorus-containing water body again for adsorption, and enriching phosphorus in the water body into desorption solution in a reciprocating manner;
wherein the total phosphorus concentration in the phosphorus-containing water body is 0.3-10 mg/L;
wherein the magnetic lanthanum-based adsorbent is the magnetic lanthanum-based adsorbent of claim 6.
8. The method of claim 7, wherein the desorbent comprises at least one of NaOH, naCl;
the concentration of NaOH is 1-1.25 mol/L;
the concentration of the NaCl is 0-1.875 mol/L;
the desorption time is 2-6h.
9. The method of claim 7, wherein the phosphorus-containing water body has a pH of 2-12;
the impurities in the phosphorus-containing water body comprise: cl - 、NO 3 - 、HCO 3 - 、Ca 2+ 、Mg 2+ And at least one of humic acid.
10. The method of claim 7, wherein the solid-liquid separation comprises at least one of a super magnetic separation and an electromagnetic separation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310014933.5A CN115920828A (en) | 2023-01-05 | 2023-01-05 | Magnetic lanthanum-based adsorbent, preparation method thereof and method for enriching phosphorus in water body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310014933.5A CN115920828A (en) | 2023-01-05 | 2023-01-05 | Magnetic lanthanum-based adsorbent, preparation method thereof and method for enriching phosphorus in water body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115920828A true CN115920828A (en) | 2023-04-07 |
Family
ID=86656040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310014933.5A Pending CN115920828A (en) | 2023-01-05 | 2023-01-05 | Magnetic lanthanum-based adsorbent, preparation method thereof and method for enriching phosphorus in water body |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115920828A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080058206A1 (en) * | 2006-04-14 | 2008-03-06 | The Board Of Regents Of The Nevada System Of Higher Education | Arsenic absorbing composition and methods of use |
| CN107694542A (en) * | 2017-09-28 | 2018-02-16 | 中国科学院广州地球化学研究所 | A kind of adsorbent for zwitterion absorption and preparation method thereof |
| CN109433153A (en) * | 2018-11-19 | 2019-03-08 | 浙江农林大学 | A kind of lignin porous charcoal and its preparation method and application that Nano-lanthanum hydroxide is modified |
| CN111389343A (en) * | 2020-04-17 | 2020-07-10 | 中国科学院生态环境研究中心 | Lanthanum-based loaded magnetic nano adsorption phosphorus removal material and synthesis method thereof |
| AU2020101505A4 (en) * | 2020-07-27 | 2020-08-27 | Guangxi University | Method for Preparing Magnetically-Responsive Aminated Cellulose-Based Material for Adsorption of Heavy Metals and Application Method Thereof |
| CN113145063A (en) * | 2020-12-01 | 2021-07-23 | 北京师范大学珠海校区 | Magnetic lanthanum-loaded attapulgite clay phosphorus removal adsorbent and preparation and application methods thereof |
| CN113600133A (en) * | 2021-07-05 | 2021-11-05 | 广州大学 | Phosphorus removal adsorbent and preparation method and application thereof |
| US20220126267A1 (en) * | 2019-11-01 | 2022-04-28 | Guangzhou University | Co-pyrolyzed sludge biochar modified by lanthanum carbonate, preparation method and use thereof |
-
2023
- 2023-01-05 CN CN202310014933.5A patent/CN115920828A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080058206A1 (en) * | 2006-04-14 | 2008-03-06 | The Board Of Regents Of The Nevada System Of Higher Education | Arsenic absorbing composition and methods of use |
| CN107694542A (en) * | 2017-09-28 | 2018-02-16 | 中国科学院广州地球化学研究所 | A kind of adsorbent for zwitterion absorption and preparation method thereof |
| CN109433153A (en) * | 2018-11-19 | 2019-03-08 | 浙江农林大学 | A kind of lignin porous charcoal and its preparation method and application that Nano-lanthanum hydroxide is modified |
| US20220126267A1 (en) * | 2019-11-01 | 2022-04-28 | Guangzhou University | Co-pyrolyzed sludge biochar modified by lanthanum carbonate, preparation method and use thereof |
| CN111389343A (en) * | 2020-04-17 | 2020-07-10 | 中国科学院生态环境研究中心 | Lanthanum-based loaded magnetic nano adsorption phosphorus removal material and synthesis method thereof |
| AU2020101505A4 (en) * | 2020-07-27 | 2020-08-27 | Guangxi University | Method for Preparing Magnetically-Responsive Aminated Cellulose-Based Material for Adsorption of Heavy Metals and Application Method Thereof |
| CN113145063A (en) * | 2020-12-01 | 2021-07-23 | 北京师范大学珠海校区 | Magnetic lanthanum-loaded attapulgite clay phosphorus removal adsorbent and preparation and application methods thereof |
| CN113600133A (en) * | 2021-07-05 | 2021-11-05 | 广州大学 | Phosphorus removal adsorbent and preparation method and application thereof |
Non-Patent Citations (3)
| Title |
|---|
| 周凤珍;李文秋;王文静;郭惠玲;: "载镧钙基蒙脱土吸附剂的制备及其吸附性能研究", 化工新型材料, no. 07, 15 July 2020 (2020-07-15) * |
| 孟顺龙;胡庚东;宋超;范立民;陈家长;徐跑;: "镧改性吸附剂废水除磷技术研究进展", 环境科学与技术, no. 2, 15 December 2012 (2012-12-15), pages 2 - 3 * |
| 牛利民, 邓春玲, 宁平: "稀土吸附剂对废水深度除磷研究", 云南环境科学, no. 03, 25 September 2004 (2004-09-25) * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102161781B (en) | Modified chitosan material capable of absorbing heavy metal ions and preparation method thereof | |
| CN107381926B (en) | Thallium-containing wastewater purification and thallium element enrichment recovery method and application thereof | |
| CN109534432B (en) | Preparation method of biochar modified material for removing phosphorus in eutrophic water body | |
| CN108273472B (en) | Preparation method of adsorbent capable of efficiently and selectively adsorbing selenious acid roots | |
| CN1500736A (en) | Preparing Method for magnetic active carbon used for water treatment | |
| CN112044404A (en) | Amidoxime group modified cyclodextrin/sodium alginate gel ball composite adsorption material and preparation method and application thereof | |
| CN112316906A (en) | Preparation method of ferromagnetic amino-modified lanthanide metal organic framework material and application of material in adsorption and dephosphorization | |
| CN107252674A (en) | A kind of dephosphorization agent based on ferronickel binary hydrotalcite | |
| CN103599745A (en) | Modified calcium silicate and its application in sewage dephosphorization | |
| CN113385144A (en) | Porous material adsorbent and preparation method and application thereof | |
| CN111892229B (en) | Method for deeply purifying and efficiently recovering trace phosphorus in biochemical tail water | |
| CN112058233A (en) | Preparation method and application of magnetic porous biochar modified by lanthanum hydroxide | |
| CN113929492B (en) | Preparation method of hydrotalcite-like composite material for phosphorus recovery, product and application thereof | |
| CN114768780A (en) | Preparation method and application of Zn-Fe Prussian blue analogue composite material | |
| CN113372523B (en) | Transition metal ion modified sulfonic acid covalent organic framework material and preparation and application thereof | |
| CN116809034B (en) | Preparation method of dephosphorizing agent based on rare earth modified gangue | |
| CN113559820A (en) | Preparation method, application and recovery method of phosphorus removal adsorbent for fosfomycin pharmaceutical wastewater | |
| CN115920828A (en) | Magnetic lanthanum-based adsorbent, preparation method thereof and method for enriching phosphorus in water body | |
| CN110064378B (en) | Magnetic chitosan carbon sphere with high adsorption performance and preparation method and application thereof | |
| CN114733486A (en) | Preparation method of phosphorus-removing modified biochar | |
| CN109395692B (en) | Preparation of modified magnetic perlite adsorbent and method for enriching rare earth from heavy yttrium rare earth wastewater | |
| CN109248648B (en) | Modified bauxite for adsorbing heavy metal ions in wastewater | |
| CN114768752A (en) | Fly ash loaded hydrotalcite-like compound composite adsorbent, preparation method and application | |
| CN110681344B (en) | Zirconium series nano hybrid material and application method thereof | |
| CN113087063A (en) | Method for deeply removing phosphorus in high-salinity wastewater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |