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Method for synthesizing composite hydroxide of iron and aluminum, and application

A composite hydroxide and synthesis method technology, which is applied in the field of synthesis of iron-aluminum composite hydroxide as an adsorption material for arsenic removal, and achieves the effects of simple and easy-to-learn process, cheap price and simple synthesis method

Inactive Publication Date: 2007-10-10
GUILIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

But so far, there is no report about using iron-aluminum composite hydroxide as adsorbent to remove arsenic in water.

Method used

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Embodiment

[0016] To analyze pure FeCl 3 ·6H 2 O and AlCl 3 ·6H 2 O is the raw material, and the total concentration of iron and aluminum ions is guaranteed to be 1mol L -1 Under the conditions, the molar ratio Fe (III): Al (III) = 8: 2, calculate the required FeCl 3 ·6H 2 O and AlCl 3 ·6H 2 The amounts of O were 113.721 g and 25.394 g, respectively. Accurately weigh 111.424g of FeCl 3 ·6H 2 O and 24.881 g of AlCl 3 ·6H 2 O, in a small beaker, dissolved in water, quantitatively transferred to a 500ml volumetric flask and fixed to the mark to make a mixed solution of iron and aluminum. Pour the above mixed solution into a 2000ml beaker, and use 3mol·L -1 NaOH solution to adjust the pH value of the reaction solution to 5.0, continue to stir for about 30 minutes, and then use 0.1mol L -1 HNO 3 or 0.1mol·L -1 NaOH to adjust the pH of the solution to 7.4. Stirring was continued for 0.5 hour, the supernatant was removed after standing for clarification, and the precipitate was ...

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Abstract

This invention discloses a method for synthesizing Fe-Al composite hydroxide and its application. The method comprises: utilizing analytical pure FeCl3.6H2O and AlCl3.6H2O as the raw materials, calculating the raw material amounts according to Fe(III) / Al(III) mol ratio of (1-9):(9-1) with a total concentration of Fe(III) and Al(III) as 1 mol / L, preparing Fe(III) and Al(III) mixed solution, precipitating to obtain Fe-Al composite hydroxide, filtering, washing, drying, grinding, sieving to obtain the final product, and performing static adsorption of Fe-Al composite hydroxide to As at 25 plus and minus 1 deg.C. This invention has such advantages as low raw material cost, simple synthesis method, and simple As removal method by adsorption. The residual As concentration is decreased from 2 mg / L to lower than 0.01 mg / L after the Fe-Al composite hydroxide adsorption treatment.

Description

technical field [0001] The invention relates to a synthesis method and application of iron-aluminum composite hydroxide, an arsenic-removing adsorption material. Background technique [0002] The removal methods of arsenic in water at home and abroad mainly include precipitation method, coagulation precipitation method, adsorption method, ion exchange method, membrane separation method, etc. Among them, the adsorption method has the advantages of simple operation, good arsenic removal effect, and many kinds of adsorbents. attention. At present, the most widely used adsorbents for arsenic removal include activated carbon, activated iron oxide, activated aluminum oxide, slag, loaded and modified ion exchange resin method, etc. However, these arsenic-removing adsorbents have low adsorption capacity and limited adsorption capacity, and cannot make the arsenic concentration of the treated arsenic-containing water sample lower than 0.01 mg L -1 , did not meet the drinking water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/02B01J20/08C02F1/28C02F1/62
Inventor 朱义年梁美娜
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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