Preparation method of mesoporous print material capable of selectively adsorbing cadmium ions

Abstract

The invention discloses a preparation method of a mesoporous print material capable of selectively adsorbing cadmium ions and belongs to the field of chemistry. The preparation method comprises the following steps: 1, dropwise adding tetraethoxysilane to a mixed solution of sodium hydroxide and cetrimonium bromide for reaction, and then processing to obtain a MCM-41 material; 2, washing the MCM-41 material; 3, adding a methanol solution to Cd(NO3)2.4H2O; 4, then adding 3-[2-(2-aminoethylamino) ethylamino] propyl-thimethoxy silane (AAAPTS) for reaction, then adding purified MCM-41, and then adding epichlorohydrin and reacting while stirring; 5, soaking for 4 hours while stirring to remove Cd<2+>; and 6, washing and drying to obtain the mesoporous print material. The mesoporous print material obtained according to the method is non-toxic and harmless, is large in adsorption capacity and strong in environmental protection property, is not soluble in water, and can be repeatedly used.

Description

technical field [0001] The invention relates to a method for preparing a mesoporous imprinted material, in particular to a method for preparing a mesoporous imprinted material which selectively absorbs cadmium ions, and belongs to the field of chemistry. Background technique [0002] At present, the traditional adsorption material is mainly activated carbon, which has the following two disadvantages. First, the adsorption capacity is small, generally around 4mg / g; second, it lacks selectivity and specificity. Heavy metals and organic pollutants are usually mixed in the environment. Under such mixed conditions, the adsorption effect of activated carbon on organic matter is better than that of heavy metal compounds. In this way, in the actual environmental wastewater treatment, organic matter and other metals will compete with cadmium for adsorption. sites, leading to a decrease in the specific and selective adsorption capacity of cadmium and a poor adsorption effect. [0003...

AI Technical Summary

Problems solved by technology

In some conferences, scholars have proposed a preparation method for the preparation of cadmium ion-imprinted mesoporous materials, but no process technology scheme and parameters have been seen. From the above research overview, it can be seen that current research is mostly focused on silica gel-based surfaces. In terms of imprinting or polymers, these synthetic products mostly contain organic groups or Fe3O4, which have poor environmental friendliness and poor adaptability under increasingly stringent environmental protection requirements, and the final adsorption capacity of the above synthesis is relatively small

[0004] A dual-template mesoporous lead ion-imprinted adsorbent was prepared by a one-step method. In some conferences, scholars proposed a preparation method for preparing cadmium ion-imprinted mesoporous materials, but no technical scheme and parameters were found. From the above From the research overview, it can be seen that the current research focuses on surface imprinting or polymers based on silica gel. These synthetic products mostly contain organic groups or Fe3O4, which are poor in environmental friendliness and poor in adaptability under increasingly stringent environmental protection requirements. Moreover, the final adsorption capacity of the above synthesis is relatively small

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