Preparation method for modified kieselguhr composite adsorbing material

Abstract

The invention discloses a preparation method for a modified kieselguhr composite adsorbing material. The method comprises the following steps of: 1) dissolving chitosan in the solution of a trivalent ferric salt, adding kieselguhr into the solution, and uniformly mixing the materials; 2) adding ethanol into the mixture to obtain a sediment, and filtering, washing and drying the sediment; and 3) adding the product obtained in the step 2) into the solution of ethanol of glutaraldehyde to be subjected to cross-linking reaction, and filtering, washing and drying the sediment. The preparation method has the beneficial effect that the kieselguhr prepared by the method is large in specific surface area and high in adsorption capacity. A dynamic absorbing experiment on Congo red shows that the highest adsorbing capacity of a composite material can be up to 1,250mg / g and the time for the balance of adsorption is not more than 10min.

Description

technical field [0001] The invention relates to a preparation method of a modified diatomite composite adsorption material. Background technique [0002] It is estimated that there are more than 100,000 commercially available dyes worldwide, and the discharge of dye wastewater exceeds 700,000 tons per year. Many dyes are toxic or even carcinogenic, posing a serious threat to aquatic organisms. Moreover, since dyes are refractory organic compounds with complex chemical structures, bacteria in conventional activated sludge cannot engulf and destroy them. Common biochemical treatment often makes the effluent unstable and difficult to meet discharge standards. Physical and chemical methods, such as: electrolytic coagulation method, chemical oxidation method, photocatalytic method, air flotation method, etc. Although these methods have relatively good treatment effects, they have strict operating conditions, poor stability, and high cost, making it difficult to promote and implem...

AI Technical Summary

Problems solved by technology

[0005] At present, the low adsorption capacity of natural diatomite minerals is common, and the dyes in printing and dyeing wastewater cannot be effectively removed. It needs to be modified to further improve its adsorption performance.

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