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

作　　者：Sana Ullah Xuejun Guo Xiaoyan Luo Xiangyuan Zhang Siwen Leng Na Ma Palwasha Faiz 

机构地区：[1]State Key Laboratory of Environment Simulation,School of Environment,Beijing Normal University,Beijing 100875,China [2]Department of Environmental and Conservation Sciences,University of Swat,Mingora 19200,Pakistan

出　　处：《Frontiers of Environmental Science & Engineering》2020年第5期147-156,共10页环境科学与工程前沿（英文）

基　　金：Authors greatly acknowledge the support from the National Natural Science Foundation of China(Grant No.21876011);the National Key Research and Development Program of China(No.2017YFA0605001);the Fund for Innovative Research Group of the National Natural Science Foundation of China(No.51721093).

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

分 类 号：X703[环境科学与工程—环境工程]