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A double-coated soil remediation agent for heavy metal polluted soil and its preparation method

A soil remediation agent and double-layer coating technology, which is applied in the field of double-layer coating soil remediation agent and preparation for heavy metal-contaminated soil, can solve the problems of loose, fragile, and easy leakage of the coating layer, and achieve strong adsorption , Improve the contact probability and prolong the service life

Active Publication Date: 2021-07-13
浙江中地净土科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of preparation method of double-layer coated soil remediation agent for heavy metal polluted soil, for solving single sodium alginate coated nanometer zero-valent iron in the prior art. Soil remediation agents have problems such as relatively loose structure, fragility, and easy leakage. At the same time, the present invention will also provide a double-layer coated soil remediation agent for heavy metal contaminated soil; in addition, the present invention will also provide a double-layer Method for remediating heavy metal polluted soil with coated soil remediation agent
The invention uses iron manganese oxide and sodium alginate to double-coat nanometer zero-valent iron, which overcomes technical problems such as relatively loose structure, fragility, and easy leakage of a single sodium alginate coating layer.

Method used

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  • A double-coated soil remediation agent for heavy metal polluted soil and its preparation method

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Effect test

Embodiment 1

[0036] A preparation method for double-layer coated soil remediation agent for heavy metal polluted soil, comprising:

[0037] Step 1. Under the protection of an inert gas, mix the nano-zero-valent iron and sodium alginate with a molar ratio of 1:0.2 to obtain a sodium alginate / nano-zero-valent iron blend; mix sodium alginate / nano-zero-valent iron The iron blend is added to the calcium chloride solution (the mass fraction of the calcium chloride solution is 3%, and the amount added is twice the mass of sodium alginate) for cross-linking reaction. The temperature of the cross-linking reaction is 20°C and the time is 90min. , spray-dried to obtain sodium alginate gel microspheres coated with nanometer zero-valent iron;

[0038] Step two, FeCl 3 ·6H 2 O and FeSO 4 ·7H 2 O is added to water to form a mixed solution, and then alkaline potassium permanganate solution (dissolve potassium permanganate in water to form a 2wt% potassium permanganate solution, then add sodium hydroxi...

Embodiment 2

[0041] A preparation method for double-layer coated soil remediation agent for heavy metal polluted soil, comprising:

[0042] Step 1. Under the protection of an inert gas, mix the nanometer zero-valent iron and sodium alginate with a molar ratio of 1:1.0 to obtain a sodium alginate / nano-zerovalent iron blend; mix sodium alginate / nano-zerovalent iron The iron blend is added to the calcium chloride solution (the mass fraction of the calcium chloride solution is 3%, and the amount added is twice the mass of sodium alginate) for cross-linking reaction. The temperature of the cross-linking reaction is 50°C and the time is 30min. , spray-dried to obtain sodium alginate gel microspheres coated with nanometer zero-valent iron;

[0043] Step two, FeCl 3 ·6H 2 O and FeSO 4 ·7H 2 O is added to water to form a mixed solution, and then alkaline potassium permanganate solution (dissolve potassium permanganate in water to form a 2wt% potassium permanganate solution, then add sodium hydr...

Embodiment 3

[0046] A preparation method for double-layer coated soil remediation agent for heavy metal polluted soil, comprising:

[0047] Step 1. Under the protection of inert gas, mix the nano-zero-valent iron and sodium alginate with a molar ratio of 1:0.4 evenly to obtain a sodium alginate / nano-zero-valent iron blend; mix sodium alginate / nano-zero-valent iron The iron blend is added to the calcium chloride solution (the mass fraction of the calcium chloride solution is 3%, and the amount added is twice the mass of sodium alginate) for cross-linking reaction. The temperature of the cross-linking reaction is 30°C and the time is 60min. , spray-dried to obtain sodium alginate gel microspheres coated with nanometer zero-valent iron;

[0048] Step two, FeCl 3 ·6H 2 O and FeSO 4 ·7H 2 O is added to water to form a mixed solution, and then alkaline potassium permanganate solution (dissolve potassium permanganate in water to form a 2wt% potassium permanganate solution, then add sodium hyd...

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Abstract

The invention relates to the technical field of soil remediation agents, in particular to a preparation method of a double-layer coated soil remediation agent for heavy metal contaminated soil, comprising: uniformly mixing nanometer zero-valent iron and sodium alginate, and then adding it to a calcium chloride solution Carry out the cross-linking reaction to obtain the sodium alginate gel microspheres coated with nano-zero-valent iron; mix the sodium alginate gel microspheres coated with nano-zero-valent iron and iron-manganese composite oxide evenly, and dry them in vacuum to obtain A double-coated soil remediation agent was obtained. The invention uses iron-manganese oxide and sodium alginate to double-coat the nanometer zero-valent iron, and overcomes the technical problems of a single sodium alginate coating layer structure being relatively loose, fragile, and easy to leak. It has a strong adsorption effect on heavy metal ions, especially the passivation effect on heavy metal ions such as chromium and lead.

Description

technical field [0001] The invention relates to the technical field of soil remediation agents, in particular to a double-coated soil remediation agent for heavy metal polluted soil and a preparation method. Background technique [0002] Human activities such as mining, metal smelting, farmland sewage irrigation, sludge agricultural use, and the application of fertilizers and pesticides have caused a large amount of soil heavy metal pollution, which seriously threatens ecological balance, food safety and human health. Among them, cadmium (Cd), mercury (Hg), arsenic (As), chromium (Cr) and lead (Pb) are considered to be the "five poisons" among the main heavy metal pollutants. The "National Soil Pollution Survey Bulletin" shows that the total exceeding rate of soil in the country is 16.1%, and the pollution type is dominated by inorganic models. The exceeding standard rate was 19.4%. Mining and metallurgy activities are the main source of heavy metal pollution. Whether it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/50
CPCC09K17/50
Inventor 陈庆昝航陈涛司文彬白涛
Owner 浙江中地净土科技有限公司