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A kind of silicified modified zero-valent iron and its preparation method and application

A zero-valent iron modification technology, applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage treatment, etc., can solve the problems of easy deactivation, passivation, and agglomeration, and achieve good results The effect of separation and fixing performance, convenient operation and simple process

Active Publication Date: 2021-10-15
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, zero-valent iron often has the defects of easy passivation, easy agglomeration, and easy loss of activity during use. decreased activity
In response to this defect, the predecessors used measures such as pickling, ultrasonication, and magnetization to remove or alleviate the inhibition effect caused by the oxide layer on the surface of zero-valent iron. However, the formation of this oxide layer in aqueous solution is unavoidable.

Method used

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  • A kind of silicified modified zero-valent iron and its preparation method and application
  • A kind of silicified modified zero-valent iron and its preparation method and application
  • A kind of silicified modified zero-valent iron and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 5 g of reduced micron iron powder and 0.16 g of layered sodium disilicate were mixed and placed in a ball mill jar, ball milled for 4 hours under an argon atmosphere at a milling speed of 500 rpm / min, washed and dried.

[0039] Taking 100mL of simulated hexavalent chromium polluted water body with a concentration of 2.5g / L as the remediation object, add 0.2g of the above-mentioned prepared iron silicide sample (Si-mZVI BM ), under constant temperature conditions, the rotating speed is 200rpm / min shaker reaction, after regular sampling, measure the hexavalent chromium content with a spectrophotometer.

[0040] At the same time, unsilicified ball-ground iron (mZVI) was milled in the same way BM ) is a controlled test, see the results Figure 4 shown. After 100 minutes of reaction, the removal rate of hexavalent chromium in the silicified modified zero-valent iron system reached 100%, while the removal rate of hexavalent chromium in the non-silicided iron system was less...

Embodiment 2

[0042] Take 10 grams of reduced micron iron powder, add 0, 0.165, 0.33, 0.66, 1, 1.3 g of sodium silicate respectively, mix them in a ball mill jar, and ball mill for 5 hours under an argon atmosphere at a ball mill speed of 550 rpm / min, wash Drying, respectively marked as mZVI BM 、1#mZVI BM 、2#mZVI BM 、3#mZVI BM 、4#mZVI BM and 5#mZVI BM .

[0043] Taking 100mL of simulated hexavalent chromium-contaminated water body with a concentration of 2g / L as the restoration object, add 0.2g of the silicified modified zero-valent iron sample prepared above, and react on a shaking table at a constant temperature with a rotation speed of 200rpm / min. After sampling, the content of hexavalent chromium was measured with a spectrophotometer, and the results were as follows: Figure 5 shown. 3#mZVI after 60min reaction BM The removal rate of hexavalent chromium reaches 97%, 4#mZVI BM Secondly, the removal rate of hexavalent chromium is 72%, and the removal of hexavalent chromium by all...

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Abstract

A silicified modified zero-valent iron, the surface layer of which is a silicon-containing oxide layer substituted by silicate, obtained by the following method: soluble silicate and micron iron powder are mixed in proportion as raw materials, prepared by ball milling in an inert gas atmosphere to obtain silicified Modified zero valent iron. In the present invention, the silicon-containing precursor and micron zero-valent iron are mixed in proportion and modified by mechanochemical means, and the obtained silicified modified zero-valent iron can be used as sewage restoration agent, groundwater in-situ injection material and permeable reaction wall filling medium , suitable for the remediation and treatment of heavy metal polluted environments. The invention uses green silicate as the silicon source to carry out silicification modification on the surface of micron zero-valent iron. The operation is simple, the cost is low, and it is convenient for large-scale production. Moreover, the prepared silicided zero-valent iron has good dispersibility, high reduction activity, and is recyclable. It has strong performance and can be used for the treatment of water and soil polluted by various heavy metals.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental materials and restoration of polluted water bodies, and in particular relates to siliconized modified zero-valent iron. [0002] The present invention also relates to the preparation method of the silicified modified zero-valent iron. [0003] The present invention also relates to the application of the silicified modified zero-valent iron in repairing water bodies polluted by various heavy metals. Background technique [0004] With the rapid development of industry and agriculture, the problem of heavy metal pollution in global water is becoming more and more serious. The heavy metal ions entering the environment are difficult to be biodegraded, but they are easily enriched by biotransformation. Long-term exposure or use of water polluted by such heavy metals will bring serious danger to surrounding residents and the ecological environment. For example, long-term use of ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/70
CPCC02F1/705C02F2101/22
Inventor 虞敏达郑明霞毛旭辉席北斗何小松孙源媛傅雪梅
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI