CN106345400A - Porous phosphorus removal adsorbent based on hydrated iron oxide and preparation method thereof - Google Patents
Porous phosphorus removal adsorbent based on hydrated iron oxide and preparation method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/12—Naturally occurring clays or bleaching earth
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0225—Compounds of Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt
- B01J20/0229—Compounds of Fe
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
- B01J20/08—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04 comprising aluminium oxide or hydroxide; comprising bauxite
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a porous phosphorus removal adsorbent based on hydrated iron oxide and a preparation method thereof. The porous phosphorus removal adsorbent is formed by an active component and a carrier, wherein the active component is beta-FeOOH, and the carrier uses kaolin, silica and alumina powder as structural aids. The main preparation method comprises the following steps: slurry preparation, slurry foaming, gelation, slurry injection molding, blank mold unloading, and blank drying. The method is characterized in that cheap and efficient hydrated iron oxide powder is used as the active component and the inorganic compound is used as the carrier, and the prepared porous adsorbent can not only retain the efficient phosphorus removal performance of the hydrated iron oxide powder, but also has the characteristic of easy recovery, and is conducive to realize the recycling of adsorbents and the recovery of phosphorus resources. The rich porous structure of the porous phosphorus removal adsorbent can effectively reduce the mass transfer resistance of phosphate in the adsorbent, which greatly promotes the phosphorus adsorption capacity and adsorption efficiency of the block phosphorus removal agent. The porous phosphorus removal adsorbent has a good application prospect for reducing phosphorus in natural water body and tail water discharge from sewage treatment plants.
Description
Technical field
The invention belongs to stain disease and natural water adsorption and dephosphorization with resource field and in particular to one kind will efficiently be removed
The method that phosphorus inorganic powder is shaped to the porous material of lightweight high porosity.
Background technology
Nitrogen, P elements enter water body and can cause body eutrophication, cause algal bloom in water, Dissolved Oxygen in Water is sharp
Subtract, serious threat is hydrobiological to survive and human health.Research shows, phosphorus is the major control in most eutrophication waters
Factor, total phosphorus in water concentration reaches the risk that 0.02 mg/l has just possessed eutrophication, when total phosphorus concentration reaches 0.5 mg/l
In water, cyanophyceae starts raised growth.Therefore, for preventing and treating body eutrophication, go the phosphorus in eliminating water particularly important.Meanwhile, phosphorus is again
A kind of valuable agricultural resource, is the requisite biological element of production estimation, with the exhaustive exploitation of the mankind, the earth
Phosphor resource has arrived the very deficient stage.Famous environment scholar James Ai Ersi and Ai Linna Bennett
(nature, 2011,478,7367:29-31) points out, with mankind's activity, the biochemical cycles quilt of P elements in nature
Destroy.Phosphorus in earth land, flows to city through agricultural product, and then in city, metabolic conversion enters urban water-body, finally
Flow to natural water, the phosphorus circulation of nature becomes a unidirectional path.Therefore, real in the urgent need to a kind of suitable technology
The circulation and stress of existing phosphor resource.
Absorption method is had many good qualities compared with traditional chemical precipitation method and bioanalysises dephosphorization.Chemical precipitation method needs to consume
Substantial amounts of chemical drugss, with high costs；In order to reach relatively low phosphate concentration, need to maintain higher concentration of metal ions,
Cause secondary pollution；The precipitating sludge producing also will be processed further.Bioanalysises dephosphorization process operation stability is poor, by waste water
Physical and chemical index impact larger, and the bod content in strong depend-ence water.Absorption rule has process stabilizing, easy and simple to handle, goes
Except efficiency high, the advantages of do not produce other by-product.Its maximum feature is that chemical precipitation method and bioanalysises all do not enable phosphorus
Recovery, and adsorbed phosphorus in absorption method, desorbing can be realized by simple chemical treatment, thus realize phosphor resource time
Receive.The core of absorption method is to develop efficient, cheap adsorbent.
Hydrated metal oxide has very abundant surface hydroxyl, with the phosphate radical in water body, ligand exchange can occur
Effect, thus the efficiently phosphorus in adsorbed water body.β-feooh is one of numerous crystal formation of hydrated ferric oxide, it is characterized in that x penetrates
Line diffraction maximum corresponds to standard card jcpds#034-1266, and β-feooh is 26.7 mg/g to the saturated extent of adsorption of phosphorus, better than exhausted
Most of inorganic compound.Simultaneously with respect to have the more hydrous zirconium oxide(HZO) of high phosphorus saturated adsorption capacity and hydration lanthanide oxide
For, the material cost of β-feooh is inexpensively a lot, therefore possesses the application potential in environmental area.
Although the powder of β-feooh has very high phosphorus absorption property, during practical application, when the powder of β-feooh
End puts into water body, and β-feooh can disperse visibly homogeneous thus forming stable colloidal sol.Therefore, it is extremely difficult to by material after the completion of absorption
Material separates from water body, thus limiting the application of material.
Porous material has the advantages that density is little, light weight, specific surface area big, than high mechanical properties.There is through-hole structure
And the material of higher porosity, be conducive to the active component in material to be fully contacted with the phosphate radical in water.Compared to common
Close material, porous material reduces the diffusional resistance in material internal for the phosphate radical, thus improve the dynamic absorption of material
Efficiency.Meanwhile, porous material possesses certain mechanical strength, under conditions of being applied to certain water impact intensity.
Content of the invention
The purpose of the present invention is by a kind of porous material forming method, adds some structural promoters to construct β-feooh
Become the porous adsorbent of a kind of lightweight, through-hole structure, high porosity, can be applicable to the phosphorus of actual cities stain disease and natural water
Remove.Solve the shortcoming that β-feooh powder body material is not readily separated in actual application, reclaims difficulty, simultaneously loose many
The structure in hole being capable of the efficient absorption property of reserved materials.
A kind of porous phosphorus removing adsorbent based on ferric hydrous oxide of the present invention and preparation method, comprise the following steps.
1) prepare powder: β-feooh, Kaolin, aluminium oxide and SiO 2 powder are mixed according to a certain percentage.
2) prepare coagulant liquid: using water as dispersion phase, the wherein mass concentration of acrylamide is 1 ~ 30 wt%, n to coagulant liquid,
The mass concentration of n '-methylene-bisacrylamide is 0.1 ~ 5 wt%, and water soluble dispersing agent mass concentration is 0.1 ~ 10 wt%, then
With ammonia, the ph of coagulant liquid is adjusted to 9 ~ 11.
3) prepare slurry: by powder and the step 2 of step 1)) coagulant liquid mixes, and puts in ball mill mixing tank, using ball milling
Machine grinds slurrying.
4) slurry foaming: the slurry that step 3) is obtained takes out, and adds surfactant, is more quickly stirred with mechanical agitator
Mix foaming.
5) gelation reaction: when step 4) carries out to a certain extent, that is, slurry has expanded to suitable volume, is continuing
Under conditions of being slowly stirred, it is added dropwise over n, n, n ', n '-tetramethylethylenediamine, addition is 5 ~ 50/100 ml, Ran Houzai
Add the initiator that certain density persulfate aqueous solution reacts as initiated gelization.
6) slurry injection molding and the idiosome demoulding: after the completion of step 5), rapidly the foamed slurry that step 5) obtains is injected mould
In tool, after the completion of waiting pulp gel, wash away additional size with clear water, realize the idiosome of molding and the disengaging of mould.
7) idiosome is dried: the porous material higher to obtain porosity, mechanical strength, selects heat drying method,
To obtain the porous material that porosity is higher, adsorption efficiency is higher, then select freeze-drying.
As described in step 1), when preparing powder, Ju Ti Pei Fang is the mass percent of β-feooh is 20 ~ 80 %, Kaolin
Mass percent be 10 ~ 20 %, the gross mass percentage ratio of aluminium oxide and SiO 2 powder is 10 ~ 70%, and ratio is m
(al2o3):m(sio2)=18:7.
As step 2) as described in, when preparing gel, water soluble dispersing agent used refers to that one kind has in intramolecular simultaneously
Lipophile and the interfacial agent of two kinds of opposite nature of hydrophilic, can prevent sedimentation and the coacervation of granule, including but not limited to
Sodium tripolyphosphate, sodium hexameta phosphate, sodium citrate and sodium pyrophosphate.
As described in step 3), powder is mixed with coagulant liquid, prepare the slurry that solid content is 40 ~ 60 wt%.
As step 2) and step 5) as described in, gel reaction select gel be acrylamide n, n '-di-2-ethylhexylphosphine oxide third
Acrylamide system, and select n, n, n ', n '-tetramethylethylenediamine can produce over cure as the catalyst of gelation reaction, selection
The persulfate of acid group free radical as the initiator of gelation reaction, including potassium peroxydisulfate, sodium peroxydisulfate and Ammonium persulfate. etc..
As described in step 4), surfactant is added to be foamed, it includes but is not limited to sodium n-alkylbenzenesulfonate, fat
Fat polyoxyethylenated alcohol sodium sulfate, AESA, sodium laurylsulfate etc.；Obtained according to step 3)
The quality of slurry, the concentration adding foaming agent is 0 % ~ 5 wt%, until the volume of the disposed slurry that foams is 0 ~ 4 times of initial volume；
It is not added with the material also protection domain for this invention that foaming agent obtains.
Described in step 7), the specific procedure that idiosome is dried is as follows, and it is unnecessary that the wet embryo absorbent cloth that step 6) is obtained washes away
Then wet embryo is put into air dry oven by moisture, in 60 ~ 150 DEG C of heat dryings until completely removing the water combining in idiosome,
Finally obtain the higher porous adsorbent of porosity, mechanical strength；Or the wet embryo absorbent cloth obtaining step 6) is washed
Remove excessive moisture, be then placed in freezing in -18 DEG C in refrigerator, until the water combining in idiosome freezes, after then freezing completely
Idiosome put in vacuum freeze drier, lyophilization until completely remove idiosome in ice, finally again that lyophilization is complete
Idiosome put in air dry oven, in 80 ~ 110 DEG C of heat dryings, obtain the porous that porosity is higher, adsorption efficiency is higher
Adsorbent.
Compared with existing phosphate adsorbent, acquired by the present invention, have the beneficial effect that 1) present invention preparation be one
Plant porous monolithic adsorbent, there is very little density (0.3 ~ 0.9 g/cm3), very high porosity (70 ~ 90%), contained
Hole mainly based on through hole, average pore size be 0.1 ~ 1 mm；2) adsorbent of the present invention has very high phosphorus ligands effect,
From hydrated metal oxide as the main active of adsorbent, give material superior phosphorus adsorption capacity, special hole
Road structure, reduces the diffusional resistance in material internal for the phosphate, gives material superior dynamic absorption efficiency；3) present invention
Selected β-feooh as main active, compared to other inorganic material, β-feooh had concurrently phosphorus adsorption capacity big and
Advantage with low cost, greatly reduces the Material Cost of material；4) raw material of the present invention is cheap and easily-available, and processing technology is simply easy
Operation, product physicochemical property is stable, can be easier to realize industrialized production.Therefore, the present invention is body eutrophication
The recovery of preventing and treating and valuable agricultural resource provides a practicable solution, has extraordinary environmental benefit
And economic benefit.
Brief description
Fig. 1 is the digital photographing figure of the porous adsorbent being obtained for mould heat drying with cube；
Fig. 2 is the digital photographing figure of the porous adsorbent being obtained for mould lyophilization with cube.
Specific embodiment
Describe a kind of porous phosphorus removing absorption based on ferric hydrous oxide of the present invention below by specific embodiment
Agent and preparation method.Unless stated otherwise, technological means used in the present invention are the side well known to the research worker of this area
Method.In addition, this specific implementation method is illustrative, it does not limit the scope of the invention, the spirit and scope of the present invention are by weighing
Sharp claim is limited.For researcher in this field, on the premise of without departing substantially from invention spirit and scope, to these
In embodiment, the control parameter of the selection of material and preparation carries out various changes and falls within protection scope of the present invention.
Embodiment 1.
First, by 30 g β-feooh and 10 g Kaolin, 7.2 g al2o3Powder, 2.8 g sio2Powder mixes.
2nd, 6 g acrylamides, appropriate n, n '-methylene-bisacrylamide and sodium citrate are added in 50 ml water, then
With ammonia, solution ph is adjusted to 10.
3rd, the powder that step one obtains is mixed with the coagulant liquid that step 2 obtains, puts into planetary ball mill and grind slurrying,
Obtain the slurry that solid content is 50 wt%.
4th, the slurry that step 3 obtains is taken out, add Surfactant SDS 0.1 g, then use machine
Tool agitator is stirred vigorously, until slurry volume is expanded to 2 times of original state.
5th, under the conditions of continuously stirred, it is added dropwise over n, n, n in slurry with dropper ', n '-tetramethylethylenediamine 15,
It is subsequently adding the Ammonium persulfate. that 2 ml mass concentrations are 10 wt%.
6th, the rapid slurry obtaining step 5 injects in the mould of 1.7*1.7*1.7cm, until gelation reaction is complete
Terminate, the wet embryo of solidification is removed from the molds, is then repeatedly cleaned with clear water.
7th, with absorbent towels, unnecessary water in wet embryo is absorbed, then put into material in air dry oven, in 105 DEG C
Under the conditions of be dried 4 h.
According to the material of example 1 gained, apparent density is 0.89 g cm-3；True according to composition each in material feedstock
Density and mass percent, the real density calculating obtained porous adsorbent is 3.3 g cm-3, the hole of therefore material
Rate is 73 %.
Embodiment 2.
First, by 30 g β-feooh and 10 g Kaolin, 7.2 g al2o3Powder, 2.8 g sio2Powder mixes.
2nd, 6 g acrylamides, appropriate n, n '-methylene-bisacrylamide and sodium citrate are added in 50 ml water, then
With ammonia, solution ph is adjusted to 10.
3rd, the powder that step one obtains is mixed with the coagulant liquid that step 2 obtains, puts into planetary ball mill and grind slurrying,
Obtain the slurry that solid content is 50 wt%.
4th, the slurry that step 3 obtains is taken out, add Surfactant SDS 0.1 g, then use machine
Tool agitator is stirred vigorously, until slurry volume is expanded to 2 times of original state.
5th, under the conditions of continuously stirred, it is added dropwise over n, n, n in slurry with dropper ', n '-tetramethylethylenediamine 15,
It is subsequently adding the Ammonium persulfate. that 2 ml mass concentrations are 10 wt%.
6th, the rapid slurry obtaining step 5 injects in the mould of 1.7*1.7*1.7cm, until gelation reaction is complete
Terminate, the wet embryo of solidification is removed from the molds, is then repeatedly cleaned with clear water.
7th, with absorbent towels, unnecessary water in wet embryo is absorbed, be then placed in freezing 4 h in -18 DEG C in refrigerator, then
Idiosome after freezing is put in vacuum freeze drier, idiosome complete for lyophilization is finally put into by lyophilization 12 h again
In air dry oven, in 105 DEG C of heat drying 2 h.
According to the material of example 2 gained, apparent density is 0.486 g cm-3；True according to composition each in material feedstock
Density and mass percent, the real density calculating obtained porous adsorbent is 3.3 g cm-3, the hole of therefore material
Rate is 85 %.
Embodiment 3.
This example, using the porous adsorbent adsorption and dephosphorization based on ferric hydrous oxide, is carried out according to the following steps.
The porous adsorbent that 1.839 g examples 1 are obtained puts into the potassium dihydrogen phosphate that 1000 ml prepare, phosphorous
2.5 mg/l(are with p element Mass Calculation), adsorb at room temperature；Take a sampled point every 3 h, monitor 48 h altogether；Adopt
Sample is measured using molybdate spectrophotography, calculates the unit adsorbance of material, and with the time as abscissa, makes
The phosphorus adsorption curve of material；The data that the Fitting Calculation goes out is as follows.
The phosphorus absorption property of example 1 gained porous adsorbent: intend First order dynamic model matching equilibrium adsorption capacity be
1.159 mg/g, correlation coefficient r2=0.998；The equilibrium adsorption capacity intending second-order kineticses models fitting is 1.749 mg/g, related
Coefficient r2=0.997；The clearance of 48 hours is 66.7 %.
Embodiment 4.
This example, using porous adsorbent adsorption and dephosphorization based on ferric hydrous oxide, different from example 3 is using real
Porous adsorbent obtained by example 2 carries out phosphorus adsorption experiment, carries out according to the following steps.
The potassium dihydrogen phosphate that porous adsorbent input 1000 ml that 1.705 g examples 2 are obtained prepare, phosphorous 2.5
Mg/l(is with p element Mass Calculation), adsorb at room temperature；Take a sampled point every 3 h, monitor 48 h altogether；The sample adopted
Measured using molybdate spectrophotography, calculate the unit adsorbance of material, and with the time as abscissa, make material
Phosphorus adsorption curve；The data that the Fitting Calculation goes out is as follows.
The phosphorus absorption property of example 2 gained porous adsorbent: intend First order dynamic model matching equilibrium adsorption capacity be
1.784 mg/g, correlation coefficient r2=0.981；The equilibrium adsorption capacity intending second-order kineticses models fitting is 2.813 mg/g, related
Coefficient r2=0.976；The clearance of 48 hours is 99 %.
Embodiment 5.
This example, using porous adsorbent adsorption and dephosphorization based on ferric hydrous oxide, different from example 4 is, by example
Porous material obtained by 2 is used for removing the phosphorus in true nature water body, rather than the artificial solution containing phosphate prepared, by following step
Suddenly carry out.
From natural water physical behavior be muddiness, grey black, smelly, main water quality index is as follows.
Certain river natural water water quality index of table three.
| Index | ph | Turbidity (ntu) | nh3- n(mg/l) | P(mg/l) |
| Numerical value | 7.29 | 159 | 9.77 | 0.53 |
Porous adsorbent obtained by 1.76 g examples 2 is added and tests in natural waters to 150 ml, the response time is
12 h, with remaining phosphorus in molybdate metric measurement experiment water body, record phosphorus in the experiment natural water after absorption dense
Spend for 0 mg/l, clearance is 100 %.
Claims (7)
1. a kind of porous phosphorus removing adsorbent based on ferric hydrous oxide and preparation method are it is characterised in that comprise the following steps:
1) prepare powder: β-feooh, Kaolin, aluminium oxide and SiO 2 powder are mixed according to a certain percentage；
2) prepare coagulant liquid: using water as dispersion phase, the wherein mass concentration of acrylamide is 1 ~ 30 wt% to coagulant liquid；n,n’-
The mass concentration of methylene-bisacrylamide is 0.1 ~ 5 wt%, and water soluble dispersing agent mass concentration is 0.1 ~ 10 wt%, then uses ammonia
Water adjusts the ph of coagulant liquid to 9 ~ 11；
3) prepare slurry: by powder and the step 2 of step 1)) coagulant liquid mixed, puts in ball mill mixing tank, ground using ball mill
Grind slurry；
4) slurry foaming: the slurry that step 3) is obtained takes out, and adds surfactant, then sent out with the quick stirring of mechanical agitator
Bubble；
5) gelation reaction: when step 4) carries out to a certain extent, that is, slurry has expanded to suitable volume, is continuing slowly
Under conditions of stirring, it is added dropwise over n, n, n ', n '-tetramethylethylenediamine, addition is 5 ~ 50/100 ml, then adds
The initiator that certain density persulfate aqueous solution reacts as initiated gelization；
6) slurry injection molding and the idiosome demoulding: after the completion of step 5), rapidly the foamed slurry that step 5) obtains is injected in mould,
After the completion of waiting pulp gel, wash away additional size with clear water, realize the idiosome of molding and the disengaging of mould；
7) idiosome is dried: the porous material higher to obtain porosity, mechanical strength, selects heat drying method, to
Obtain the porous material that porosity is higher, adsorption efficiency is higher, then select freeze-drying.
2. a kind of porous phosphorus removing adsorbent based on ferric hydrous oxide according to claims 1 and preparation method, its
It is characterised by: when step 1 prepares powder, Ju Ti Pei Fang is the mass percent of β-feooh is 20 ~ 80 %, kaolinic quality
Percentage ratio is 10 ~ 20 %, and aluminium oxide is 10 ~ 70 % with the gross mass percentage ratio of SiO 2 powder, and ratio is m (al2o3):m
(sio2)=18:7.
3. a kind of porous phosphorus removing adsorbent based on ferric hydrous oxide according to claims 1 and preparation method, its
Be characterised by: when step 2 prepares gel, water soluble dispersing agent used refer to a kind of intramolecular have simultaneously lipophile and
The interfacial agent of two kinds of opposite nature of hydrophilic, can prevent sedimentation and the coacervation of granule, including but not limited to tripolyphosphate
Sodium, sodium hexameta phosphate, sodium citrate and sodium pyrophosphate etc..
4. a kind of porous phosphorus removing adsorbent based on ferric hydrous oxide according to claims 1 and preparation method, its
It is characterised by: in step 3), powder is mixed with coagulant liquid, prepare the slurry that solid content is 40 ~ 60 wt%.
5. a kind of porous phosphorus removing adsorbent based on ferric hydrous oxide according to claims 1 and preparation method, its
Be characterised by: in step 2) in select gel be acrylamide n, n '-methylene-bisacrylamide system, in step 5)
Middle selection n, n, n ', n '-tetramethylethylenediamine can produce persulfate free radical as the catalyst of gelation reaction, selection
Persulfate is as the initiator of gelation reaction, including but not limited to potassium peroxydisulfate, sodium peroxydisulfate and Ammonium persulfate. etc..
6. a kind of porous phosphorus removing adsorbent based on ferric hydrous oxide according to claims 1 and preparation method, its
It is characterised by: add surfactant to be foamed in step 4), it includes but is not limited to sodium n-alkylbenzenesulfonate, fat
Polyoxyethylenated alcohol sodium sulfate, AESA, sodium laurylsulfate etc.；The slurry being obtained according to step 3)
Quality, the concentration adding foaming agent is 0 % ~ 5 wt%, until the volume of the disposed slurry that foams is 0 ~ 4 times of initial volume；It is not added with
The material that foaming agent obtains also is the protection domain of this invention.
7. a kind of porous phosphorus removing adsorbent based on ferric hydrous oxide according to claims 1 and preparation method, its
It is characterised by: the specific procedure that step 7) idiosome is dried is as follows, and the wet embryo absorbent cloth that step 6) is obtained washes away excessive moisture,
Then wet embryo is put into air dry oven, in 60 ~ 150 DEG C of heat dryings until completely removing the water combining in idiosome, finally
To the higher porous adsorbent of porosity, mechanical strength；Or it is unnecessary that the wet embryo absorbent cloth obtaining step 6) washes away
Moisture, is then placed in freezing in -18 DEG C in refrigerator, until the water combining in idiosome freezes completely, then by the idiosome after freezing
Put in vacuum freeze drier, lyophilization is until remove the ice in idiosome completely, finally again by idiosome complete for lyophilization
Put in air dry oven, in 80 ~ 110 DEG C of heat dryings, obtain the porous adsorbent that porosity is higher, adsorption efficiency is higher.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107952422A (en) * | 2017-12-07 | 2018-04-24 | 中国科学院城市环境研究所 | A kind of porous heavy metal absorbent based on biomass carbon and preparation method thereof |
| CN110427733A (en) * | 2019-09-09 | 2019-11-08 | 河北工程大学 | Algae concentration acquisition methods based on phosphorus circulation |
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| CN107952422A (en) * | 2017-12-07 | 2018-04-24 | 中国科学院城市环境研究所 | A kind of porous heavy metal absorbent based on biomass carbon and preparation method thereof |
| CN110427733A (en) * | 2019-09-09 | 2019-11-08 | 河北工程大学 | Algae concentration acquisition methods based on phosphorus circulation |
| CN110427733B (en) * | 2019-09-09 | 2022-11-29 | 河北工程大学 | Method for obtaining algae concentration based on phosphorus cycle |
| CN111039658A (en) * | 2019-12-31 | 2020-04-21 | 广东省水利水电科学研究院 | Phosphorus removal ceramsite and preparation method thereof |
| CN113926424A (en) * | 2021-10-12 | 2022-01-14 | 北京尚水清源水处理技术有限公司 | Preparation method of phosphorus removal agent |
| CN115231692A (en) * | 2022-09-23 | 2022-10-25 | 中科格润(唐山)环境技术有限公司 | Synchronous nitrogen and phosphorus removal filler and preparation method thereof |
| CN116832765A (en) * | 2023-07-18 | 2023-10-03 | 水利部交通运输部国家能源局南京水利科学研究院 | Fine-particle sediment dephosphorization adsorbent and preparation method thereof |
| CN116832765B (en) * | 2023-07-18 | 2023-12-01 | 水利部交通运输部国家能源局南京水利科学研究院 | Fine-particle sediment dephosphorization adsorbent and preparation method thereof |
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