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

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...

AI Technical Summary

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.

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