Research Progress in Theory and Technology of Fluorine Removal by Alumina-based Adsorbents
Excessive concentration of fluoride ions(F-)in water can cause harm to the environment and human health.Common methods for fluoride removal in drinking water include adsorption,coagulation precipitation,electrochemical method,membrane separation,etc.The adsorption method has been widely used in the field of groundwater fluoride removal due to its low cost,high reuse rate,and significant fluoride removal effect.Alumina-based adsorption materials have rich surface active sites and strong affinity for fluoride ions,so they are one of the most widely studied adsorption materials at present.This paper describes the methods of metal modification and surface activation of Activated alumina and the basic principle of defluorination,analyzes the main factors affecting adsorption,such as pH,types of coexisting ions,temperature,adsorbent dosage,contact time,etc.which provides a reference for the follow-up research of alumina-based adsorption defluorination,and puts forward research suggestions.
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