CN1193822C - High-activity ferric oxide adsorbant and its prepn - Google Patents
High-activity ferric oxide adsorbant and its prepn Download PDFInfo
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- CN1193822C CN1193822C CNB03153998XA CN03153998A CN1193822C CN 1193822 C CN1193822 C CN 1193822C CN B03153998X A CNB03153998X A CN B03153998XA CN 03153998 A CN03153998 A CN 03153998A CN 1193822 C CN1193822 C CN 1193822C
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Abstract
The present invention relates to a high-activity ferric oxide adsorbent and a preparation method thereof, which belongs to the technical field of water treatment. The present invention uses soluble trivalent inorganic ferric salt, alkali and a water soluble hydroxy polymer or a water soluble amido polymer as raw materials; the method of a solution precipitation reaction is used for synthesizing precipitation substances of ferric oxide at ordinary temperature; then, after water washing, dehydration and dryness, the high-activity ferric oxide adsorbent is obtained. The adsorption capacity of the adsorbent prepared by the method is 1.2 to 2.0 times of that of active aluminum oxide; the bulk density of the adsorbent is 1.5 to 2.1 times of that of the active aluminum oxide. The present invention has the advantages of low raw material price, good cyclic regeneration performance, etc., reduces the packing volume of the adsorbent for adsorption and dephosphorization technology, lengthens an operation cycle, and reduces operation expense; moreover, the adsorbent has simple preparation technology.
Description
Technical field
The present invention relates to a kind of iron oxide adsorbent and preparation method thereof, belong to water-treatment technology field.
Background technology
Excessive phosphorus causes the eutrophication of water body with other superfluous nutrient in the environment water, prevents that by the phosphorus of removing in the water body method that eutrophication takes place is proved to be the most permanently effective method.There is the operating condition strictness separately in conventional wastewater biological dephosphorization method and chemical precipitation dephosphorization method, produce secondary pollution, can not reclaim defective such as phosphor resource; And advantage such as the adsorption and dephosphorization method has that operation is simple and reliable, adsorbent reusable edible and phosphor resource reproducible utilization.
In the absorption method dephosphorization process, activated alumina commonly used is as adsorbent.But activated alumina has following deficiency: adsorption capacity is lower, and the optimization pH value scope that is suitable for is narrower, and its optimum operation pH value is 3, and aluminium ion has the stripping tendency under this pH value, and the aluminium ion of stripping has chronic bio-toxicity.Therefore causing particularly is the research of the compound adsorbent of bulk material with the ferriferous oxide to non-aluminium class both at home and abroad, for example iron-based hydrotalcite-like iron-calcium, iron-Magnesium coumpoud oxide adsorbent, and iron-cerium composite oxides adsorbent etc.Though above-mentioned new adsorbent respectively has advantage, but still exist or adsorption capacity relatively low, or the metal ion stripping is arranged, or the cost of raw material is than problems such as height.
Summary of the invention
At the deficiencies in the prior art and defective, the purpose of this invention is to provide a kind of highly active active oxidation iron adsorbent and preparation method thereof and in Application of Sewage.
Technical scheme of the present invention is as follows:
A kind of iron oxide preparation of adsorbent method, this method is carried out as follows:
(1) with the aqueous solution of water soluble hydroxy polymer or water-soluble amide based polyalcohol preparation 0.1～2.0wt%;
(2) stoichiometry of water-soluble trivalent inorganic molysite by mole concentration 0.2～1.5M added in the aforementioned macromolecule aqueous solution, make mixed solution, stirring is dissolved it fully;
(3) under condition of stirring, adding concentration is the strong base solution of 1.0～10.0M, and the pH value of control reaction solution obtains precipitated product between 2.5～5.5;
(4) the gained precipitated product is washed, dewatered, after the drying, promptly obtains the iron oxide adsorbent.
Water soluble hydroxy polymer of the present invention adopts polyvinyl alcohol; The water-soluble amide based polyalcohol adopts polyacrylamide.Described trivalent inorganic molysite is iron chloride, ferric nitrate or ferric sulfate.
Iron oxide adsorbent of the present invention is as the application of removing superfluous phosphorus in waste water and the environment water.
The present invention compared with prior art has the following advantages and the high-lighting effect: the adsorbents adsorb capacity height that is provided, its Unit Weight adsorbance are 1.2～2.0 times of activated alumina; Adsorbent density is big, and bulk density is 1.5～2.1 times of activated alumina, this means and can use less quantity of sorbent, and make packing volume less; Applicable pH range is wide, and it is 2～7 that normal temperature is optimized the pH scope down; The iron ion stripping meets all kinds of water standards, does not have other metal ion stripping problem; Adsorbent can the multiple adsorb-desorb-multiplexing circulation of regenerating, and adsorption capacity is stable, and the adsorbent loss is less, can make the operation cycle lengthening, and operating cost reduces.
The specific embodiment
With the degree of polymerization is 40-50, the aqueous solution of 000 water soluble hydroxy polymer or water-soluble amide based polyalcohol preparation 0.1～2.0wt%; With water-soluble trivalent inorganic molysite (as iron chloride, ferric nitrate or ferric sulfate etc.), add in the aforementioned macromolecule aqueous solution according to the stoichiometry of molar concentration 0.2～2.0M, stirring is dissolved it fully; Then under condition of stirring, adding concentration is the strong base solution of 1.0～10.0M, and addition is 2.5～5.5 to be advisable with the control pH value in reaction, after the stirring by certain hour makes the pH value remain unchanged and precipitates abundant dispersion, obtains precipitated product.Behind the washing of above-mentioned precipitated product process, dehydration, drying process, can obtain oxide of high activity iron adsorbent adsorbent.
Embodiment 1
The aqueous solution with the PVA of mean molecule quantity 1,845 (degree of polymerization 42) preparation 0.2wt% dissolves FeCl with this solution
3Preparation FeCl
3The mixed solution of concentration 1.5M.NaOH solution with 10M under stirring at normal temperature carries out precipitation reaction to mixed solution, and control reaction final states pH value is 2.5, stirs reaction is carried out fully.To precipitation wash, dewater, drying, adsorbent sample 1.By specific area measuring, this adsorbent sample specific area is 165.6m
2/ g is higher than common hydrated ferric oxide 40%; The X-ray diffraction result shows that this adsorbent is complete unformed shape material.
Sample 1 is used for absorption to phosphate solution phosphorus.In temperature is 25 ℃, and initial pH is 3.0, carries out adsorption test under the condition of initial phosphorus concentration 50mg/L.Two 100ml water samples are added 0.1g sample 1 and 0.1g reactive powder aluminium oxide respectively, and the adsorbance that records after the adsorption equilibrium is respectively: sample 1:37.9mg-P/g; Powder activity aluminium oxide: 27.8mg-P/g.Sample 1 is 1.36 times of activated alumina Unit Weight adsorbance.The bulk density of sample 1 is 1.33, is about 1.9 times of seed activity aluminium oxide, and sample 1 unit volume adsorbance is about 1.81 times of activated alumina among this embodiment.
Embodiment 2
The PVA solution of preparation 0.1wt% is with this solution dissolving Fe
2(SO
4)
3The mixed solution of compound concentration 0.2M.KOH solution with 1M under stirring at normal temperature carries out precipitation reaction to mixed solution, and control reaction final states pH value is 3.5, stirs reaction in 30 minutes and carries out fully.To precipitation wash, dewater, drying, adsorbent sample 2.
Sample 2 is used for absorption to phosphate solution phosphorus.In temperature is 25 ℃, and initial pH is 5.0, carries out adsorption test under the condition of initial phosphorus concentration 50mg/L.Two 100ml water samples are added 0.1g sample 2 and 0.1g reactive powder aluminium oxide respectively, and the adsorbance that records after the adsorption equilibrium is respectively: sample 2:28.9mg-P/g; Powder activity aluminium oxide: 22.6mg-P/g.Sample 2 is 1.28 times of activated alumina Unit Weight adsorbance.The bulk density of sample 2 is 1.30, is about 1.85 times of seed activity aluminium oxide.
Embodiment 3
With mean molecule quantity is the aqueous solution of the PAM preparation 2.0wt% of 3,000,000 (degree of polymerization 43,000), with this solution dissolving Fe (NO
3)
3The mixed solution of compound concentration 0.5M.NaOH solution with 5M under stirring at normal temperature reacts the mixed solution carrying out hydrolyzing and precipitating, and control reaction final states pH value is 4.5, stirs reaction in 30 minutes and carries out fully.To precipitation wash, dewater, drying, adsorbent sample 3.
Sample 3 is used for absorption to phosphate solution phosphorus.In temperature is 25 ℃, and initial pH is 5, carries out adsorption test under the condition of initial phosphorus concentration 50mg/L.To the 100ml water sample is the final state equilibrium concentration that reaches 0.5mg/L, needs to add 0.278g sample 3 and 0.934g powder activity aluminium oxide respectively, and sample 3 consumptions are 29.8% of activated alumina.The bulk density of sample 3 is 1.47, is about 2.1 times of activated alumina, and the adsorbent volume of sample 3 is 14.2% of activated aluminas among this embodiment.
4 pairs of samples 1 of embodiment to sample 3 carries out solubility test in the acid solution of pH=3, detect solution colourity behind the dissolving 24h, and the three is colourless, is lower than the comprehensive wastewater first discharge standard, and the iron ion solubility test is qualified.
Embodiment 5
Get the adsorption/desorption that adsorbent sample 1 carries out 5 cycles/regeneration cycle test, remove have an appointment 15% the reduction of preceding two cycle adsorption capacities, back three cycle adsorption capacities are basicly stable, recycle respond well.
Comparative example 6 (comparative example)
Get adsorbent sample 1 and powder activity aluminium oxide and under pH=3 and pH=9, carry out the test of embodiment 1 respectively.The former was 1.36 times of the latter's Unit Weight adsorbance when result showed pH=3; The former is 1.91 times of the latter's Unit Weight adsorbance during pH=9.
Claims (3)
1. iron oxide preparation of adsorbent method is characterized in that this method carries out as follows:
(1). with the aqueous solution of water soluble hydroxy polymer or water-soluble amide based polyalcohol preparation 0.1～2.0wt%;
(2). the stoichiometry of water-soluble trivalent inorganic molysite by mole concentration 0.2～1.5M added in the aforementioned macromolecule aqueous solution, make mixed solution, stirring is dissolved it fully;
(3). under condition of stirring, adding concentration is the strong base solution of 1.0～10.0M, and the pH value of reaction solution is controlled between 2.5～5.5, obtains precipitated product;
(4). the gained precipitated product is washed, dewatered, after the drying, promptly obtains the iron oxide adsorbent.
2. it is characterized in that in accordance with the method for claim 1: the water soluble hydroxy polymer described in the step (1) adopts polyvinyl alcohol; The water-soluble amide based polyalcohol adopts polyacrylamide.
3. it is characterized in that in accordance with the method for claim 1: the trivalent inorganic molysite described in the step (2) is iron chloride, ferric nitrate or ferric sulfate.
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| CNB03153998XA CN1193822C (en) | 2003-08-22 | 2003-08-22 | High-activity ferric oxide adsorbant and its prepn |
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| CN1193822C true CN1193822C (en) | 2005-03-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101804320A (en) * | 2010-05-04 | 2010-08-18 | 中国科学院生态环境研究中心 | Nano-level iron adsorbent for efficient dephosphorization |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215036B (en) * | 2005-04-25 | 2010-06-02 | 昆明理工大学 | Reproducible electric plating immobilization dephosphorizing agent chemical dephosphorylation method |
| CN102029145B (en) * | 2009-09-29 | 2012-12-19 | 清华大学 | Iron-based composite absorbing agent and preparation method thereof |
| CN103212373B (en) * | 2012-01-19 | 2015-06-10 | 崔文豪 | Soldering flux adsorbent and adsorption method thereof |
| CN103170302B (en) * | 2013-04-02 | 2014-11-12 | 中国科学院生态环境研究中心 | Active aluminum oxide fluoride-removal adsorbing material with different surface characteristics as well as preparation method and application thereof |
| CN106345400B (en) * | 2016-10-27 | 2022-05-20 | 中国科学院城市环境研究所 | Porous phosphorus removal adsorbent based on hydrated iron oxide and preparation method |
| CN108212128A (en) * | 2018-01-26 | 2018-06-29 | 山东星火科学技术研究院 | A kind of graphene adsorbent for oil desulfurization |
| CN111151231B (en) * | 2020-01-09 | 2021-10-15 | 浙江工业大学 | Method for regenerating denitration ferric chloride adsorbent |
| CN114314782A (en) * | 2021-12-21 | 2022-04-12 | 西安铭鼎盛源环保科技有限公司 | Preparation method of novel efficient phosphorus removal agent for sewage treatment |
| CN116474711A (en) * | 2023-05-15 | 2023-07-25 | 北京化工大学 | Efficient dephosphorization adsorbent and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101804320A (en) * | 2010-05-04 | 2010-08-18 | 中国科学院生态环境研究中心 | Nano-level iron adsorbent for efficient dephosphorization |
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