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Application of activated aluminum oxide defluorination adsorbing material with different surface features

A technology of surface characteristics and adsorption materials, which is applied in the direction of adsorption of water/sewage treatment, other chemical processes, and purification of combustible gases. It can solve the problems of difference in fluoride ion adsorption effect, large reactor, and decrease in adsorption capacity, so as to improve the removal of fluoride. The effect of adsorption capacity

Active Publication Date: 2014-09-17
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Application of activated aluminum oxide defluorination adsorbing material with different surface features

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Experimental program
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Effect test

Embodiment 1~5

[0048] Fluorine (F - ) concentration, total dissolved solids (TDS), alkalinity, Cl - Concentration, hardness and other different water quality chemical characteristics, determined the specific process parameters for the preparation of active aluminum oxide fluorine removal adsorption materials with different surface characteristics, as shown in Table 1:

[0049] Table 1

[0050]

[0051] The preparation method of the active aluminum oxide fluorine removal adsorption material with different surface characteristics is as follows:

[0052] (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 mi...

Embodiment 6

[0057] 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:

[0058] (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...

Embodiment 7

[0063] Fluorine (F - ) concentration is 2~3mg / L, total dissolved solids (TDS) is - The concentration is <100mg / L, and the hardness is <250mg / 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:

[0064] (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 element to chlorine element in the mixed aqueous solution is 0.32:1); under the condition of full stirring, MgCl 2 and AlCl 3 The mixed aqueous solution is slowly added to the KOH aqueous solution and fully mixed to obtain a reaction system, and the MgCl 2 and AlCl 3 The mixed aqueous solution is slowly added to the KOH aqueous solution and the pH value of the reaction system is mon...

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Abstract

The invention relates to application of an activated aluminum oxide defluorination adsorbing material with different surface features. According to the activated aluminum oxide defluorination adsorbing material with different surface features, chloride ions which can be subjected to an ion exchange reaction with fluoride ions are imported to the surface of the activated aluminum oxide defluorination adsorbing material, so that the anion exchange capacity and the defluorination adsorbing capacity are greatly improved and then excellent defluorination adsorbing property is shown; meanwhile, compared with the traditional activated aluminum oxide, the preparation complexity and the preparation cost are not improved; the defluorination process of the activated aluminum oxide defluorination adsorbing material with different surface features is realized through a plurality of ways such as adsorption, complexation, chelation and ion exchange, and the adsorbing sites are rich, so that favorable adsorbing capability is achieved; the application process of the activated aluminum oxide defluorination adsorbing material with different surface features is convenient and the used equipment is simple; in long-term using process, after the activated aluminum oxide defluorination adsorbing material fully adsorbs, the excellent adsorbing capability can be recovered through simple lye desorption and regeneration operation.

Description

technical field [0001] The invention relates to an active aluminum oxide fluorine removal adsorption material, in particular to the application of the active aluminum oxide fluorine removal adsorption material with different surface features. Background technique [0002] Fluorine exists widely in the groundwater environment, and is mainly derived from the dissolution and release of fluorine in rocks, minerals and soils during natural geochemical processes. Fluorine pollution in groundwater is relatively common in my country. Except for Shanghai, drinking-water fluorosis that uses groundwater as a water source has been found in other provinces, autonomous regions and municipalities directly under the Central Government. The survey found that the probability of suffering from mild or above dental fluorosis among people who drink well water with a fluoride ion concentration of about 2.0mg / L for a long time is close to 50%; Dental fluorosis, skeletal fluorosis generally occurs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/58C02F9/02B01J20/08B01J20/30B01J20/34
Inventor 刘锐平曲久辉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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