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Zero-valent iron composite material and preparation method and application thereof

A technology of composite materials and zero-valent iron, applied in the field of environmental chemistry, can solve the problems of particle surface active site decline, application hindrance, easy agglomeration, etc., and achieve the effects of easy popularization and application, convenient operation, and easy operation

Active Publication Date: 2021-10-22
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small size effect and surface area effect, nano-zero-valent iron is unstable, easy to agglomerate, and easily oxidized to form passivation layers of goethite (α-FeOOH), lepidocite (γ-FeOOH), and magnetite. (Fe3O4), leading to a decrease in the active sites on the particle surface, thus hindering its application

Method used

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  • Zero-valent iron composite material and preparation method and application thereof
  • Zero-valent iron composite material and preparation method and application thereof
  • Zero-valent iron composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] In this embodiment, a zero-valent iron composite material is prepared, and the specific process is as follows:

[0045] S1: Put 56g of reduced iron powder and 6g of boric acid into a ball mill jar, the rotating speed is 300r / min, and the ball milling time is 12h to obtain boric acid ball milled zero-valent iron (B-ZVI bm );

[0046] S2: Continue to put 2g of zeolite into the ball mill, keep the rotating speed at 300r / min, and the ball milling time is 12h to obtain the zero-valent iron composite material (ZB-ZVI bm ).

Embodiment 2

[0048] In this embodiment, a zero-valent iron composite material is prepared, and the specific process is as follows:

[0049] S1: Put 56g of reduced iron powder and 4.9g of boric acid into a ball mill jar, the rotating speed is 350r / min, and the ball milling time is 10h to obtain boric acid ball milled zero-valent iron (B-ZVI bm );

[0050] S2: Continue to drop 3g of zeolite into the ball mill, keep the rotating speed at 350r / min, and the ball milling time is 12h to obtain the zero-valent iron composite material (ZB-ZVI bm ).

Embodiment 3

[0052] In this embodiment, a zero-valent iron composite material is prepared, and the specific process is as follows:

[0053] S1: Put 5.6g of reduced iron powder and 0.4946g of boric acid into a ball mill jar, the rotating speed is 400r / min, and the ball milling time is 6h to obtain boric acid ball milled zero-valent iron (B-ZVI bm );

[0054] S2: Continue to put 0.6g zeolite into the ball mill, keep the rotating speed at 400r / min, and the ball milling time is 6h, to obtain the zero-valent iron composite material (ZB-ZVI bm ).

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Abstract

The invention provides a zero-valent iron composite material and a preparation method and application thereof. According to the zero-valent iron composite material, the technical defects that traditional zero-valent iron is prone to agglomeration and unstable can be overcome, surface active sites are increased, meanwhile, a porous material is further adopted for coating, and therefore the activity of boric acid zero-valent iron is kept. The zero-valent iron composite material can be prepared by adopting a ball milling method, the reaction condition is simple, operation is easy, and industrialization is convenient. The zero-valent iron composite material is applied to soil remediation, soil with pollutants being polybrominated diphenyl ethers and / or heavy metal and different pollution degrees can be treated and remedied, and the zero-valent iron composite material has good development prospects.

Description

technical field [0001] The invention belongs to the technical field of environmental chemistry, and in particular relates to a zero-valent iron composite material and a preparation method and application thereof. Background technique [0002] Soil is an important part of the human ecological environment and one of the main natural resources for human survival. However, various environmental problems are becoming more and more prominent at present, and soil pollution has become one of the serious environmental problems in the world. The main pollutants that cause soil pollution are heavy metals, persistent organic pollutants, and petroleum. Among them, it is very difficult to remediate the compound polluted soil mainly caused by heavy metals and organic matter. However, due to its pollution characteristics, heavy metals infiltrate into the soil, enter rivers and groundwater, which will cause local soil and groundwater pollution, and directly or indirectly affect local reside...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 方战强薛成杰
Owner SOUTH CHINA NORMAL UNIVERSITY
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