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Arsenic removal adsorbent and preparation method thereof

An adsorbent, Sifang technology, applied in the field of preparation of arsenic removal adsorbent particles for drinking water, can solve the problem of small quality loss

Active Publication Date: 2013-06-19
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 leucophyte powder

[0077] The molar ratio of ferric chloride and sodium sulfate is Fe 3+ : SO4 2-= 4:1 ratio is dissolved in the aqueous solution, at 20 ℃, stirring and mixing, wherein, the iron ion concentration in the mixed solution is 0.4M; under stirring, quickly add 2M sodium hydroxide solution dropwise to 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 dropwise to pH 9.5, then stop stirring and let stand for 24 hours; centrifuge the solution after standing, and then wash with deionized water after centrifugation solids until the pH of the effluent is near 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 tetragonal sulfate wofrogynite arsenic-removing adsorbent powder.

[0078] 2. Preparation of adsorbent...

Embodiment 2

[0087] 1. Preparation of tetragonal sulfate leucophyte powder

[0088] Molar ratio of ferric sulfate and potassium sulfate to Fe 3+ : SO4 2- =4:1 ratio is dissolved in the aqueous solution, at 40 ℃, stirring and mixing, wherein, the iron ion concentration in the mixed solution is 0.4M; under stirring, rapidly dropwise add 4M sodium hydroxide solution 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 dropwise to pH 8.5, then stop stirring and let stand for 24 hours; centrifuge the solution after standing, and then wash the centrifuge with deionized water. solids until the pH of the effluent is near 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 tetragonal sulfate wofrogynite arsenic-removing adsorbent powder.

[0089] 2. Preparation of polymer binder

[009...

Embodiment 3

[0097] 1. Preparation of tetragonal sulfate leucophyte powder

[0098] The molar ratio of ferric chloride and potassium sulfate is Fe 3+ : SO4 2- =3:1 ratio is dissolved in the aqueous solution, at 50 ℃, stirring and mixing, wherein, the iron ion concentration in the mixed solution is 0.33M; in the case of stirring, quickly add 3M sodium hydroxide solution dropwise to the above mixed solution, Until the pH value of the solution is 4.0; after stirring for 1 hour, slowly add 3M sodium hydroxide solution dropwise to pH 7.5, then stop stirring and let stand for 24 hours; centrifuge the solution after standing, and then wash the centrifuge with deionized water. solids until the pH of the effluent is near 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 tetragonal sulfate wofrogynite arsenic-removing adsorbent powder.

[0099] 2. Preparation of po...

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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 in particular relates to a preparation method of arsenic-removing adsorbent particles for drinking water. Background technique [0002] For a long time, the harm of drinking arsenic-containing water to human health has been the focus of attention. Research in recent years has shown that drinking water with lower concentrations of arsenic for a long time can also lead to the occurrence of many diseases. The new drinking water hygiene standard (GB5479-2006) promulgated 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, adsorp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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