Compound metal oxide de-fluorine sorbent

A composite metal and oxide technology, applied in the direction of adsorption water/sewage treatment, other chemical processes, chemical instruments and methods, etc., can solve the problems of narrow applicable pH range and small adsorption capacity

Active Publication Date: 2007-05-02
北京国中科创环境科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a composite metal oxide defluorination adsorbent, i.e. a transition metal (comprising Ti, V, Cr , Mn, Fe, Co, Ni, Cu,...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dissolving zinc sulfate, aluminum sulfate, and lanthanum chloride in a molar ratio of Zn:Al:La=0.5:4:1 to form an aqueous solution, stirring and mixing at room temperature;

[0021] Under stirring, add sodium hydroxide solution dropwise to the above solution until the pH of the solution is 9.0; let it stand for 24 hours;

[0022] Centrifugal washing and separation with deionized water until the pH of the effluent is close to neutral; the washed product is dried at 120°C to constant weight, and roasted at 250°C for 3 hours to obtain the composite metal oxide defluorination adsorbent of the present invention.

[0023] When the composite metal oxide defluorination adsorbent is used to treat fluorine-containing water (when the equilibrium concentration of fluorine ions in water is 25 mg / L, pH=7), the adsorption capacity to fluorine is 47 mg / g (that is, every gram of the composite metal Oxide defluorination adsorbent adsorbs 47 mg of fluorine).

Embodiment 2

[0025] Dissolving ferric chloride, aluminum sulfate and lanthanum nitrate in a molar ratio of Fe: Al: La = 1: 4: 1 to form an aqueous solution, stirring and mixing at room temperature;

[0026] Under stirring, add sodium carbonate solution dropwise to the above solution until the pH of the solution is 9.0; let it stand for 24 hours;

[0027] Centrifugal washing and separation with deionized water until the pH of the effluent is nearly neutral; the washed product is dried at 90°C to constant weight, and roasted at 500°C for 3 hours to obtain the composite metal oxide defluorination adsorbent of the present invention.

[0028] When the composite metal oxide fluorine-removing adsorbent is used to treat fluorine-containing water (when the equilibrium concentration of fluorine ions in water is 25 mg / L, pH=7), when the equilibrium concentration of fluorine ions in water is 25 mg / L, the adsorption capacity of fluorine is It is 75mg / g.

Embodiment 3

[0030] Dissolving manganese nitrate, aluminum nitrate and cerium nitrate in a molar ratio of Mn:Al:La=1.5:4:1 to form an aqueous solution, stirring and mixing at room temperature;

[0031] Under the condition of stirring, dropwise add the molar mass concentration of ammonia solution to the above solution until the pH of the solution is 9.5; let it stand for 24 hours; centrifugally wash and separate with deionized water until the pH of the effluent is nearly neutral; the product after washing is in Dry at 100°C to constant weight, and bake at 400°C for 2 hours to obtain the composite metal oxide fluorine removal adsorbent of the present invention.

[0032] When the composite metal oxide fluorine-removing adsorbent is used to treat fluorine-containing water (when the equilibrium concentration of fluorine ion in water is 25 mg / L, pH=7), the adsorption capacity for fluorine is 47 mg / g.

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Abstract

A complex metal oxide used as an adsorbent for removing fluorine from water is prepared from the transition metal chosen from Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn, aluminum and RE metal chosen from Ce and La in the mole ratio of (0.5-1.5): (2-6): (0.5-1.5) through dissolving them in water to become aqueous solution, dropping alkali solution to make its pH=9.0-9.5, laying aside, centrifugal washing and separating by deionized water, drying, and grinding.

Description

technical field [0001] The invention belongs to the technical field of adsorption materials, in particular to a composite metal oxide fluorine removal adsorbent. Background technique [0002] Fluorosis caused by drinking high-fluoride water is one of the most widely distributed endemic diseases in the world. In addition to Shanghai, other provinces, autonomous regions and municipalities in China have found drinking-water fluorosis. Therefore, there are strict requirements on the fluorine content in drinking water in the world. The World Health Organization stipulates that the allowable concentration of fluorine in drinking water is 0.6-1.5mg / L, and the maximum allowable concentration of fluorine in drinking water in my country is 1mg / L. The maximum allowable discharge concentration of fluorine inorganic compounds in wastewater is 10mg / L. Among the numerous methods for defluoridation of drinking water, adsorption is considered to be the most promising method. The key to the...

Claims

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Application Information

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IPC IPC(8): B01J20/06C02F1/28
Inventor 杨敏邬晓梅张昱豆小敏
Owner 北京国中科创环境科技有限责任公司
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