Forming method of efficient composite type electrical fluoride removing adsorbent

Abstract

The present invention relates to the field of adsorbent preparation, specifically to a forming method of an efficient composite type electrical fluoride removing adsorbent. The method comprises the following steps: 1) adding polyvinyl alcohol to water under stirring at a room temperature, swelling, and heating until the polyvinyl alcohol is completely dissolved; 2) cooling the resulting polyvinylalcohol aqueous solution from the step 1), adding a carboxylic acid solution under stirring; carrying out esterification and crosslinking in water bath with a temperature of 40-100 DEG C to obtain anesterification product solution, cooling the solution to the room temperature; 3) adding an active metal oxide, a conductive material and a dispersing agent to the resulting esterification product solution from the step 2), extruding the resulting mixture under pressure of 0.5-10 Mpa into strips, then cutting into sections to obtain wet particles with the required size; carrying out a post-crosslinking treatment and drying. The method of the present invention has the following advantages that: the polyvinyl alcohol and the carboxylic acid are selected as the binders, the biological toxicity is low, and the reaction conditions are mild; the formed adsorbent has high strength, high toughness, less adsorption capacity loss, small swelling, no metal or toxic organic compound dissolving, and the water quality is safe after treating.

Description

technical field [0001] The invention relates to the field of preparation of adsorbents, in particular, the invention relates to a preparation method of a conductive high-efficiency composite electro-catalyzed fluorine removal adsorbent. Background technique [0002] Fluorine is one of the essential trace elements for the human body. The appropriate concentration of fluorine in drinking water is 0.5-1.0 mg / L. Adequate intake of fluorine can make bones and teeth firm, reduce the incidence of dental caries, and also stimulate the excitatory conduction of the nervous system. , calcium and phosphorus metabolism, parathyroid function, cellular enzyme system and reproductive process play an important role. When the drinking water lacks fluoride, it is easy to suffer from dental caries; but if drinking water with a fluoride concentration higher than 1.0mg / L for a long time, it will cause dental fluorosis, bone fluorosis and other symptoms of fluorosis, and some data show that long-t...

AI Technical Summary

Problems solved by technology

[0004] (1) Most of the adsorbent materials are in the form of powder, and there is no suitable molding method, and many of the molding methods are expensive, which is not conducive to popularization and application;

[0005] (2) The adsorbent prepared by the existing molding method has poor crushing strength and is easy to swell, which is not conducive to the filling, processing and regeneration of the adsorption tower / tank / column;

[0006] (3) Some molding processes make the adsorbent after molding contain harmful substances, which will dissolve organic matter and metals during use, which will affect water quality and safety

[0007] (4) The forming process causes the specific surface area of ​​the adsorbent to decrease, and the adsorption capacity is greatly lost