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Magnetic soil remediation agent for heavy metal pollution of soil as well as preparation method and application of magnetic soil remediation agent

A soil remediation agent and heavy metal technology, applied in the field of soil remediation, can solve the problem of high cost, achieve the effects of inhibiting absorption, significantly passivating fixation, and increasing adsorption capacity

Active Publication Date: 2021-09-17
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the market price of silicate-based heavy metal passivators is as high as 5,000-10,000 yuan / t. Although it can effectively modify heavy metal-contaminated farmland soil, the cost is too high

Method used

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  • Magnetic soil remediation agent for heavy metal pollution of soil as well as preparation method and application of magnetic soil remediation agent
  • Magnetic soil remediation agent for heavy metal pollution of soil as well as preparation method and application of magnetic soil remediation agent
  • Magnetic soil remediation agent for heavy metal pollution of soil as well as preparation method and application of magnetic soil remediation agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1 prepares magnetic soil remediation agent of the present invention

[0039] One, prepare magnetic soil remediation agent of the present invention

[0040] Choose the magnetic material Fe 3 o 4 , γ-Fe 2 o 3 As the core body, heavy metal collectors ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid trisodium salt (NTA), (S,S)-ethylenediamine-N,N-disuccinic acid trisodium salt (EDDS) and mercaptoethylamine were used as modifiers, and the silica after activation by strong alkali was used as the repair agent aggregate to prepare a collection functional magnetic soil repair agent with amino and mercapto groups.

[0041] Prepare magnetic soil remediation agent of the present invention, operate according to the following steps:

[0042] (1) Preparation of SiO 2 Aggregate: SiO with a purity of 97% 2 Powder as raw material, according to SiO 2 :NaOH mass ratio 1:0.1~0.15 Add solid NaOH (purity 99%), roast at 800°C for 30-60min, after the discharge is c...

Embodiment 2

[0059] Embodiment 2 Application of soil remediation agent of the present invention

[0060] One, the pot test research of soil remediation agent product of the present invention

[0061] In order to study the soil remediation agent of the present invention on the remediation effect of soil heavy metal pollution and the influence on the absorption of heavy metals by plants, a field test was carried out with Chinese cabbage as the object, and the morphological changes of soil heavy metals Pb, Cu, Cr, Cd, Hg, As were emphatically carried out Analysis and effects on crop growth.

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Abstract

The invention discloses a magnetic soil remediation agent for soil heavy metal pollution and a preparation method and application thereof. The magnetic soil remediation agent is prepared by taking remediation agent aggregate and a magnetic material core body as raw materials and taking a heavy metal collecting agent as a modifier; wherein the repairing agent aggregate is silicon dioxide activated by strong base; the magnetic material core body is prepared from magnetic materials of Fe3O4 and gamma-Fe2O3; and the modifier is prepared from ethylene diamine tetraacetic acid (EDTA), nitrilotriacetic acid trisodium salt (NTA), (S,S)-ethylene diamine-N,N-disuccinic acid trisodium salt (EDDS) and mercaptoethylamine. The remediation agent can effectively passivate heavy metals in soil, reduce the effective state content of the heavy metals and inhibit the absorption of plants to the heavy metals.

Description

technical field [0001] The invention relates to soil remediation technology, in particular to a magnetic soil remediation agent for soil heavy metal pollution and its preparation method and application. Background technique [0002] With the continuous acceleration of the industrialization process, various pollutants containing heavy metals continue to enter the surrounding farmland soil through various channels such as industrial waste gas, pesticides and fertilizers, sewage irrigation, and waste accumulation and transfer, causing serious soil heavy metal pollution (Cd, Pb, As, Cr and other pollution). Due to the irreversible and non-degradable characteristics of soil heavy metals, these heavy metals will bring great harm after entering the farmland soil, not only have a negative impact on the number and population structure of soil microorganisms, but also interfere with the normal metabolism of crops, resulting in reduced crop yields, Quality drops. In addition, after t...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08C09K101/00
CPCC09K17/40B09C1/08C09K2101/00B01J20/06B01J20/10B01J20/22B01J20/28009B01J20/28021B01J20/3204B01J20/3223B01J20/3265B01J20/3293C09K17/46
Inventor 陈涛晏波黄剑
Owner SOUTH CHINA NORMAL UNIVERSITY
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