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Rapid and long-effective removal of broad-spectrum pollutants from aqueous system by ZVI/oxidants

Frontiers of Environmental Science & Engineering 2020年第5期14卷 147-156页

作者： Sana Ullah Xuejun Guo Xiaoyan Luo Xiangyuan Zhang Siwen Leng Na Ma palwasha faiz State Key Laboratory of Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China Department of Environmental and Conservation Sciences University of SwatMingora 19200Pakistan

Zero-valent iron(ZVI)technology has recently gained significant interest in the efficient sequestration of a wide variety of ***,surface passivation of ZVI because of its intrinsic passive layer would lead to the inferior reactivity of ZVI and its lower efficacy in contaminant ***,to activate the ZVI surface cheaply,continuously,and efficiently is an important challenge that ZVI technology must overcome before its wide-scale *** date,several physical and chemical approaches have been extensively applied to increase the reactivity of the ZVI surface toward the elimination of broad-spectrum ***,these techniques have several limitations such as low efficacy,narrow working pH,eco-toxicity,and high installation *** objective of this mini-review paper is to identify the critical role of oxygen in determining the reactivity of ZVI toward contaminant ***,the effect of three typical oxidants(H2O2,KMnO4,and NaClO)on broad-spectrum contaminants removal by ZV1 has been documented and *** reaction mechanism and sequestration efficacies of the ZVI/oxidant system were evaluated and *** technical basis of the ZVI/oxidant approach is based on the half-reaction of the cathodic reduction of the *** oxidants commonly used in the water treatment industry,i.e.,NaClO,O3,and H2O2,can be served as an ideal coupling electron *** the combination of these oxidants,the surface corrosion of ZVI can be continuously *** ZVI/oxidants technology has been compared with other conventional technologies and conclusions have been drawn.

关键词： Zero-Valent Iron(ZVI) Oxidants Heavy Metals(HMs) Metalloids Nitrate,Phosphate

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