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Arsenic removal adsorbent and preparation method thereof

An adsorbent and tetragonal technology, which is applied in the field of preparation of arsenic-removing adsorbent particles for drinking water, and can solve the problems of small mass loss and the like

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

[0010] The object of the present invention is to provide a kind of arsenic-removing adsorbent particles for drinking water and its preparation method in view of the problems existing in the prior art. Small quality loss, no dissolution, no secondary pollution, safe and reliable, suitable for long-term use and in the case of large changes in water flow pressure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] 1. Preparation of tetragonal sulfate lepidocrocite powder

[0077] The molar ratio of ferric chloride and sodium sulfate to Fe 3+ : SO4 2- =4:1 dissolved in the aqueous solution, stir and mix well at 20°C, wherein the iron ion concentration in the mixed solution is 0.4M; while stirring, quickly drop 2M sodium hydroxide solution into the above mixed solution, Until the pH value of the solution is 4.0; after stirring for 6 hours, slowly add 2M sodium hydroxide solution to pH 9.5, then stop stirring and let stand for 24 hours; centrifuge the settled solution, and then wash with deionized water after centrifugation Until the pH of the effluent is close to neutral, and the SO in the effluent 4 2- It cannot be detected by ion chromatography; the washed product is dried at 40°C to a moisture content of less than 1%, and ground to obtain a tetragonal sulfate lepidolite adsorbent powder.

[0078] 2. Preparation of adsorbent particles

[0079] Add the tetragonal sulfate lepidocrocite p...

Embodiment 2

[0087] 1. Preparation of tetragonal sulfate lepidocrocite powder

[0088] The molar ratio of iron sulfate and potassium sulfate to Fe 3+ : SO4 2- = 4:1 dissolved in the aqueous solution, stirring and mixing at 40°C, where the iron ion concentration in the mixed solution is 0.4M; while stirring, 4M sodium hydroxide solution is quickly added dropwise to the above mixed solution, Until the pH of the solution is 4.0; after stirring for 6 hours, slowly add 4M sodium hydroxide solution to pH 8.5, then stop stirring and let stand for 24 hours; centrifuge the solution after standing, and then wash with deionized water after centrifugation Until the pH of the effluent is close to neutral, and the SO in the effluent 4 2- It cannot be detected by ion chromatography; the washed product is dried at 40°C to a moisture content of less than 1%, and ground to obtain a tetragonal sulfate lepidolite adsorbent powder.

[0089] 2. Preparation of polymer binder

[0090] In a closed device, under the cond...

Embodiment 3

[0097] 1. Preparation of tetragonal sulfate lepidocrocite powder

[0098] The molar ratio of ferric chloride and potassium sulfate to Fe 3+ : SO4 2- =3:1 ratio dissolved in the aqueous solution, stir and mix well at 50°C, where the iron ion concentration in the mixed solution is 0.33M; while stirring, quickly drop 3M sodium hydroxide solution into the above mixed solution, Until the pH of the solution is 4.0; after stirring for 1 hour, slowly add 3M sodium hydroxide solution to pH 7.5, then stop stirring and let stand for 24 hours; centrifuge the solution after standing, and then wash with deionized water after centrifugation Until the pH of the effluent is close to neutral, and the SO in the effluent 4 2- It cannot be detected by ion chromatography; the washed product is dried at 40°C to a moisture content of less than 1%, and ground to obtain a tetragonal sulfate lepidolite adsorbent powder.

[0099] 2. Preparation of polymer binder

[0100] After dissolving polyvinyl alcohol (249...

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Abstract

The invention provides an arsenic removal adsorbent and a preparation method thereof. The adsorbent contains sulfate akaganeite and high-molecular material agglomerant. In the invention, the particles of the arsenic removal adsorbent have high adsorption property to have high adsorption selectivity to arsenic in drinking water, the adsorption capacity is high, the adsorbed particles have large strength under a drying state or a moisture state, the particle crushing rate is low during use, no adsorbent is dissolved out, and the arsenic removal adsorbent is suitable for being used for a long time and under the condition of larger water flow pressure change.

Description

Technical field [0001] The invention belongs to the technical field of adsorption materials, and particularly relates to a preparation method of adsorbent particles for removing arsenic from drinking water. Background technique [0002] For a long time, the harm to human health of drinking water containing arsenic has been the focus of attention. Recent studies have shown that long-term drinking of water with lower concentrations of arsenic can also cause many diseases. The newly promulgated drinking water sanitary standard (GB5479-2006) in 2006 stipulates that the limit of arsenic concentration in drinking water is 0.01mg / L, and the limit of arsenic concentration in the water quality indicators of small centralized water supply and decentralized water supply is 0.05mg / L. [0003] The removal methods of arsenic in water include adsorption method, iron salt coagulation precipitation method, electrocoagulation and reverse osmosis. Among them, adsorption technology is considered to...

Claims

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Application Information

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IPC IPC(8): B01J20/02B01J20/30
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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