Diatomite-based adsorbent material for immobilizing mercury in river sediments

Abstract

The invention discloses a diatomite-based adsorbent material for immobilizing mercury in river sediments. A preparation method for the diatomite-based adsorbent material comprises the following steps: cleaning diatomite and then modifying the cleaned diatomite with a mixed solution prepared from hexamethyldisiloxane, 2-amino-3,5-dichloropyridine, tetrakis(vinyldimethylsiloxy)silane and 4-cyanomethyltetrahydropyran so as to prepare a substance A; modifying the substance A with a mixed solution prepared from SnCl4, CeCl3, Cu(NO3)2 and Mn(NO3)2 so as to prepare a substance B; modifying the substance B with a mixed solution prepared from 3-methylthiodiphenylamine, 2-amino-3-chloropyrazine and 5-bromo-6-azauracil so as to prepare a substance C; and modifying the substance C with a mixed solution prepared from octamethylcyclotetrasiloxane, 3-methylthiodiphenylamine and 2-octoxytetrahydro-2H-pyran so as to obtain the diatomite-based adsorbent material for immobilizing mercury in river sediments.

Description

technical field [0001] The invention belongs to the technical field of heavy metal pollution control in river bottom mud, in particular to a diatomite-based adsorption material used for solidifying mercury in river bottom mud. 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, it will break away from the sediment and be rel...

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 mercury in polluted sediments. Therefore, the development of diatomite-based adsorption materials for solidifying mercury in river sediments is of great significance for the treatment of heavy metal pollution in river sediments.