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Compound arsenic-removing adsorbent and preparation method thereof

An adsorbent, composite metal technology, applied in chemical instruments and methods, other chemical processes, alkali metal compounds, etc., to achieve high selectivity and good ion selectivity

Active Publication Date: 2011-07-06
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a kind of adsorbent for removing arsenic in drinking water and its preparation method for the problems existing in the above-mentioned prior art. Dissolution, no secondary pollution problem, safe and reliable, suitable for long-term use and in the case of large changes in water pressure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] 1. Preparation of composite metal oxide powder

[0071] Ferrous chloride and zirconium sulfate are dissolved in a molar ratio of Fe: Zr=0.1:0.01 to form an aqueous solution, stirred and mixed; under stirring, slowly dripping a potassium hydroxide solution with a concentration of 6M in the above solution, Until the pH of the solution is 9.0; stand for 4 hours;

[0072] Centrifuge the mixed solution after standing still, then add deionized water to the centrifuged solid and stir evenly, then perform centrifugation, then add deionized water to stir evenly and centrifuge, repeatedly add water and stir well Centrifuge, wash the centrifuged solid until the pH of the supernatant after centrifugation is neutral and the conductivity is 2 ; The product after centrifugal treatment is dried at 40° C. to obtain a composite metal oxide arsenic-removing adsorbent powder with a moisture content of 1%.

[0073] 2. Preparation of adsorbent particles

[0074] Add the composite oxide pow...

Embodiment 2

[0082] 1. Preparation of composite metal oxide powder

[0083] Dissolve ferrous sulfate and ceric sulfate in a molar ratio of Fe: Ce=0.15:0.15 to form an aqueous solution, stir and mix; while stirring, slowly add 6M potassium hydroxide solution dropwise to the solution pH is 9.0; stand for 4 hours;

[0084] Centrifuge the mixed solution after standing still, then add deionized water to the centrifuged solid and stir evenly, then perform centrifugation, then add deionized water to stir evenly and centrifuge, repeatedly add water and stir well Centrifuge, wash the centrifuged solid until the pH of the supernatant after centrifugation is neutral and the conductivity is 2 ; The product after centrifugal treatment is dried at 40° C. to obtain a composite metal oxide arsenic-removing adsorbent powder with a moisture content of 1%.

[0085] 2. Preparation of polymer binder

[0086] In a closed device, under the condition that the stirring rate is 150rpm, the polyvinyl formal powder i...

Embodiment 3

[0093] 1. Preparation of composite metal oxide powder

[0094] Dissolve ferrous sulfate and ceric sulfate in water at a molar ratio of Fe: Ce=0.3:0.05 to form an aqueous solution, stir and mix well; while stirring, slowly dropwise add potassium hydroxide with a concentration of 4M to the above aqueous solution solution until the pH of the solution is 9.0; stand for 24 hours;

[0095] Centrifuge the mixed solution after standing still, then add deionized water to the centrifuged solid and stir evenly, then perform centrifugation, then add deionized water to stir evenly and centrifuge, repeatedly add water and stir well Centrifuge, wash the centrifuged solid until the pH of the supernatant after centrifugation is neutral and the conductivity is 2 ; The product after centrifugal treatment is dried at 40° C. to obtain a composite metal oxide arsenic-removing adsorbent powder with a moisture content of 2%.

[0096] 2. Preparation of polymer binder

[0097] After dissolving polyvi...

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Abstract

The invention provides an arsenic-removing adsorbent for drinking water and a preparation method thereof. The adsorbent contains composite metal oxide and a polymer material binder. The arsenic-removing adsorbent has high adsorption property, high adsorption selectivity on arsenic in the drinking water, and high adsorption capacity; adsorbent particles have high strength in a dry state or in a moist state, and the adsorbent has low breakage rate of the particles and cannot be dissolved out during use; and the adsorbent is used under the conditions of long time and larger change of waterflow pressure.

Description

technical field [0001] The invention belongs to the technical field of adsorbent materials, in particular to a preparation method of adsorbent particles for arsenic removal in drinking water. Background technique [0002] For a long time, the harm of drinking arsenic-containing water to human health has been the focus of people's attention. Studies in recent years have shown that long-term drinking of water containing low concentrations of arsenic can also lead to the occurrence of many diseases. In 2006, the newly promulgated sanitary standard for drinking water (GB5479-2006) stipulates that the limit of arsenic concentration in drinking water is 0.01 mg / L, and the limit of arsenic concentration in water quality indicators for small-scale centralized water supply and decentralized water supply is 0.05mg / L. [0003] Methods for removing arsenic in water include adsorption, iron salt coagulation precipitation, electrocoagulation, and reverse osmosis. Among them, the adsorp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/02B01J20/28B01J20/30B01J2/20
Inventor 张昱赵蓓豆小敏杨敏高迎新于建伟
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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