Silicification modified zero-valent iron and preparation method and application thereof
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A zero-valent iron, modified technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc. The effect of fixed performance, simple process and convenient operation
Active Publication Date: 2021-01-22
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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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.
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Embodiment 1
[0039] 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.
[0040] 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.
[0041] 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
[0043] 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 .
[0044] 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
The invention provides silicification modified zero-valent iron. The surface layer of the silicification modified zero-valent iron is a silicate-substituted silicon-containing oxide layer, and the silicification modified zero-valent iron is obtained through the following method that soluble silicate and micron iron powder serve as raw materials and are mixed in proportion, ball milling is conducted in the inert gas atmosphere, and the silicification modified zero-valent iron is obtained. The silicon-containing precursor and the micron zero-valent iron are mixed in proportion and then modifiedby adopting a mechanochemical way, and the obtained silicification modified zero-valent iron can be used as a sewage remediation agent, an underground water in-situ injection material and a permeablereactive barrier filling medium and is suitable for remediation and treatment of heavy metal polluted environments. Green silicate is used as a silicon source to perform surface silicification modification on micron zero-valent iron, operation is simple, cost is low, large-scale production is facilitated, and the prepared silicified zero-valent iron is good in dispersity, high in reduction activity and high in recycling performance and can be used for 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. [0004] technical background [0005] 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 u...
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