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Active aluminum oxide fluoride-removal adsorbing material with different surface characteristics as well as preparation method and application thereof

A surface feature and adsorption material technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve the problems of difference in fluoride ion adsorption effect, large reactor, and decrease in adsorption capacity, etc., to achieve improved removal Effect of fluorine adsorption capacity

Active Publication Date: 2013-06-26
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Problems solved by technology

However, activated alumina has the following disadvantages in the application process: low adsorption capacity leads to frequent regeneration, slow adsorption rate requires high empty bed residence time (EBCT), which leads to excessive reactor size and high engineering investment , the adsorption performance is greatly affected by the pH value, the adsorption capacity decreases after regeneration, the adsorption cycle is greatly shortened, and there is a risk of aluminum dissolution, etc.
Studies have shown that there are essential differences in surface properties and adsorption mechanisms of alumina with different composition and structural characteristics, such as specific surface area, particle size, surface charge, and surface functional groups, so that the adsorption effect on fluoride ions also shows significant differences.

Method used

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  • Active aluminum oxide fluoride-removal adsorbing material with different surface characteristics as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1～9

[0055] The preparation method of the active aluminum oxide fluorine removal adsorption material with different surface characteristics is as follows:

[0056] (1) The prepared concentration is 12Kg / m 3 Al 2 (SO 4 ) 3 Aqueous solution with a concentration of 0.5Kg / m 3 NaCl aqueous solution is mixed to obtain Al 2 (SO 4 ) 3 An aqueous solution mixed with NaCl (the molar ratio of aluminum to chlorine in the mixed aqueous solution is 8.2:1), and the concentration is 2.5Kg / m 3 NaOH aqueous solution; under the condition of full stirring, slowly add NaOH aqueous solution to Al 2 SO 4 Fully mix in the aqueous solution mixed with NaCl to obtain the reaction system, and slowly add the NaOH aqueous solution to the Al 2 SO 4 Monitor the pH value of the reaction system during the process of fully mixing the aqueous solution mixed with NaCl, when the equilibrium pH of the reaction system eq Values ​​are pH as shown in Table 1 eq value, stop adding NaOH aqueous solution; react un...

Embodiment 10～12

[0061] The preparation method of the active aluminum oxide fluorine removal adsorption material with different surface characteristics is as follows:

[0062] (1) The prepared concentration is 12Kg / m 3 Al 2 (SO 4 ) 3 Aqueous solution with a concentration of 0.5Kg / m 3 NaCl aqueous solution is mixed to obtain Al 2 (SO 4 ) 3 An aqueous solution mixed with NaCl (the molar ratio of chlorine to aluminum in the mixed aqueous solution is 8.2:1), and the concentration of the preparation is 2.5Kg / m 3 NaOH aqueous solution; under the condition of full stirring, the Al 2 SO 4 The aqueous solution mixed with NaCl is slowly added to the NaOH aqueous solution and fully mixed to obtain a reaction system, and the Al 2 SO 4 The aqueous solution mixed with NaCl is slowly added to the NaOH aqueous solution and the pH value of the reaction system is monitored during the process of thorough mixing. When the equilibrium pH of the reaction system eq Values ​​are pH as shown in Table 1 eq ...

Embodiment 13

[0066] Fluorine (F - ) concentration is 1~2mg / L, total dissolved solids (TDS) is 450mg / L, Cl - The concentration is >250mg / L, the hardness is >450mg / L, according to the water quality conditions, the preparation conditions of active aluminum oxide fluorine removal adsorption materials with different surface characteristics are as follows:

[0067] (1) The preparation concentration is 15Kg / m 3 KOH aqueous solution; the prepared concentration is 1Kg / m 3 MgCl 2 Aqueous solution and 20Kg / m 3 AlCl 3 aqueous solution is mixed to obtain MgCl 2 and AlCl 3 Mixed aqueous solution (the molar ratio of aluminum to chlorine in the mixed aqueous solution is 0.32:1); under fully stirred conditions, slowly add KOH aqueous solution to MgCl 2 and AlCl 3 Fully mix in the mixed aqueous solution to obtain a reaction system, and slowly add the KOH aqueous solution to the MgCl 2 and AlCl 3 Monitor the pH value of the reaction system during the mixing of the mixed aqueous solution, when the e...

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Abstract

The invention relates to a fluoride-removal adsorbing material for removing fluorides in drinking water and in particular relates to an active aluminum oxide fluoride-removal adsorbing material with different surface characteristics as well as a preparation method and an application of the active aluminum oxide fluoride-removal adsorbing material. The active aluminum oxide fluoride-removal adsorbing material with different surface characteristics is obtained by carrying out the processes including sufficient chemical reaction, ageing, drying, grinding and the like into an aluminum salt aqueous solution, a chlorine salt aqueous solution and an alkali aqueous solution, wherein the specific preparation process parameters are determined by water quality chemical characteristics of to-be-treated water. Based on active aluminum oxide fluoride-removal adsorbing material with different surface characteristics, the actions including complexing, condensing and the like are carried out to transfer free fluorides in the water into complexing fluorides, so that the adsorbing performances of the active aluminum oxide fluoride-removal adsorbing material with different surface characteristics are greatly improved, the adsorbing period is prolonged and the operation cost is reduced. Fluorides in the drinking water are removed by adopting the method disclosed by the invention, so that the treated water can reach the national drinking water standards.

Description

technical field [0001] The invention relates to a fluorine removal adsorption material for removing fluorine in drinking water, in particular to an active aluminum oxide fluoride removal adsorption material with different surface characteristics and a preparation method thereof, and the active aluminum oxide fluoride removal adsorption material with different surface characteristics in Application in removing fluoride from drinking water. Background technique [0002] There is relatively common groundwater fluorine pollution in my country. Fluorine removal and control technology in drinking water is a hot and difficult issue in domestic and foreign research. The commonly used defluoridation technologies at home and abroad mainly include activated alumina adsorption, electrodialysis, bone charcoal adsorption filtration, ion exchange resin bed filtration, aluminum salt coagulation precipitation method and membrane filtration. Various technical methods have different advantag...

Claims

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Application Information

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IPC IPC(8): B01J20/08B01J20/30C02F1/28C02F101/14
Inventor 曲久辉刘锐平巩文信刘会娟兰华春
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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