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Sulfhydryl-smectite composite material for treating heavy metal pollution of soil and preparation method thereof

A montmorillonite and composite technology, applied in soil conditioning materials, chemical instruments and methods, organic fertilizers, etc., can solve the problems of limited heavy metal adsorption capacity, insignificant repair effect, low adsorption selectivity, etc., and achieve large-scale convenience. Promotion and application, the effect of facilitating the promotion and use, and the simple process method

Active Publication Date: 2012-09-12
广东省地质实验测试中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these mineral improvers in the prior art have a certain passivation and repair effect on heavy metal pollution in soil, they have limited adsorption capacity (3-35 mg / g) and low adsorption selectivity (cannot adsorb various heavy metals) for heavy metals. , Not wide application, weak combination (easy to desorb), insignificant repair effect, large usage, high cost, serious secondary pollution and other disadvantages, so it still needs to be greatly improved and researched to adapt to and meet the heavy metal pollution in soil The practical need for governance fixes

Method used

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  • Sulfhydryl-smectite composite material for treating heavy metal pollution of soil and preparation method thereof
  • Sulfhydryl-smectite composite material for treating heavy metal pollution of soil and preparation method thereof
  • Sulfhydryl-smectite composite material for treating heavy metal pollution of soil and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] In this example, a mercapto-montmorillonite composite material for treating heavy metal pollution in soil is obtained by modifying the montmorillonite after acid activation treatment with a mercapto-containing complex using natural clay calcium-based montmorillonite as the matrix. The composite material, its preparation method is as follows:

[0029] (1) Evenly disperse the natural clay calcium-based montmorillonite in the hydrochloric acid solution according to the mass ratio of clay montmorillonite: 20% hydrochloric acid solution = 1: 100, and stir at 80° C. for 4 hours; centrifuge, wash 3 times, After centrifugation, dry at 110°C to obtain the acid-activated montmorillonite; then uniformly disperse the acid-activated montmorillonite in distilled water according to the mass ratio of acid-activated montmorillonite:water=1:100 to obtain an aqueous solution of montmorillonite;

[0030] (2) According to the volume ratio of mercapto complex: ethanol: water=1:8:0.5, the thr...

Embodiment 2

[0034] In this example, a mercapto-montmorillonite composite material for treating heavy metal pollution in soil is obtained by modifying the montmorillonite after acid activation treatment with a mercapto-containing complex using natural clay calcium-based montmorillonite as the matrix. The composite material, its preparation method is as follows:

[0035] (1) Evenly disperse the natural clay calcium-based montmorillonite in the hydrochloric acid solution according to the mass ratio of clay montmorillonite: 20% hydrochloric acid solution = 1:50, and stir at 60°C for 4 hours; centrifuge, wash 3 times, After centrifugation, dry at 110°C to obtain the acid-activated montmorillonite; then uniformly disperse the acid-activated montmorillonite in distilled water according to the mass ratio of acid-activated montmorillonite: water = 1:60 to obtain an aqueous solution of montmorillonite;

[0036] (2) According to the volume ratio of mercapto complex: ethanol: water=1:8:0.5, the three...

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Abstract

The invention discloses a sulfhydryl-smectite composite material for treating heavy metal pollution of soil, which is prepared by modifying acid-activated smectite with a sulfhydryl complex. The invention also discloses a preparation method of the composite material. Massive effective active functional group-SH is embedded into the smectite interlayer and grafted onto the smectite surface to form the sulfhydryl-smectite composite material, thereby obviously enhancing the adsorption capacity of the material; and the sulfhydryl-smectite composite material is combined more firmly, and has wide application range. The invention effectively enhances the restoration effect, has the advantages of simple and feasible technique, low cost, high safety and secondary pollution, is suitable for restoring heavy metal mediumly / heavily polluted soil, and also has obvious effect on combined pollution caused by cadmium, lead, nickel and various other toxic heavy metal elements.

Description

technical field [0001] The invention relates to the technical field of soil heavy metal pollution treatment and restoration, in particular to a mercapto-montmorillonite composite material and a preparation method thereof. Background technique [0002] The treatment and repair methods of heavy metal pollution in soil can be summarized into three categories: purification, passivation, and harm avoidance. Among them, passivation treatment has a wide application prospect because of its low cost and obvious effect. Passivation is a soil pollution control technology that reduces the environmental mobility and biological toxicity by changing the form of heavy metals in the soil. Its technical measures include heat treatment, vitrification, soil amendments, microbial methods, etc. Among them, heat treatment and vitrification will completely and irreversibly destroy the natural properties of the soil, so they cannot be used for farmland soil pollution remediation. Although the micro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/42
Inventor 冯超刘文华赵秋香李媛媛陈亚刚黄晓纯李海萍朱霞萍
Owner 广东省地质实验测试中心
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