Attapulgite-based adsorbing material for curing chromium in river sediments and preparation method of adsorbing material

Abstract

The invention discloses an attapulgite-based adsorbing material for curing chromium in river sediments and a preparation method of the adsorbing material. The preparation method comprises the following steps: cleaning attapulgite, modifying by a mixed solution prepared from 2-fluoropyrimidine-3-bisdiboron, phenyl propargyl sulfide, N-methyl-N-phenylthiourea and p-toluenesulfonic acid N-octadecyl ester so as to obtain a substance A; modifying the substance A through a mixed solution prepared from NbCl4, AlCl3, Co(NO3)2 and Mg(NO3)2 so as to obtain a substance B; modifying the substance B by a mixed solution of 1-phenacyl-3-phenylthiourea, benzothiophene-3-carbaldehyde and 4-methyl-2-methylthiopyrimidine so as to obtain a substance C; and modifying the substance C by a mixed solution prepared from (3-bromopropoxy) tert-butyldimethylsilane, methylene methanedisulfonate and S-propan-2-yl carbonochloridothioate, thereby obtaining the attapulgite-based adsorbing material for curing chromium in river sediments.

Description

technical field [0001] The invention belongs to the technical field of heavy metal pollution control in river bottom mud, and in particular relates to an attapulgite soil-based adsorption material for solidifying chromium in river bottom mud and a preparation method thereof. Background technique [0002] When heavy metals enter the water body, through ion exchange, adsorption, flocculation, co-precipitation, etc., most of them finally enter the river sediment and accumulate continuously in the sediment. The continuous enrichment of heavy metals in the sediment will cause harm to fish and benthic molluscs in the water body, and destroy the aquatic ecology of the river. When the oxidation-reduction conditions, salinity, pH, and the amount of natural or synthetic complexing agents in the water body change, some heavy metals in the sediment can undergo diffusion, desorption, dissolution, oxidation-reduction, complexation, etc. Under the influence of biological and other factors...

AI Technical Summary

Problems solved by technology

However, there are few studies on which stabilizers are more effective for different heavy metals.

In particular, there is still a lack of cheap and efficient solidification materials for solidifying chromium in polluted sediments. Therefore, the development of attapulgite soil-based adsorption materials for solidifying chromium in river sediments is of great significance for the treatment of heavy metal pollution in river sediments.