The capacity and mechanisms of various oxidants on regulating the redox function of ZVI

作     者：Siqi Zou Qun Chen Yang Liu Yuting Pan Gang Yao Zhicheng Pan Bo Lai Siqi Zou;Qun Chen;Yang Liu;Yuting Pan;Gang Yao;Zhicheng Pan;Bo Lai

作者机构：State Key Laboratory of Hydraulics and Mountain River EngineeringCollege of Architecture and EnvironmentSichuan UniversityChengdu 610065China Sino-German Centre for Water and Health ResearchSichuan UniversityChengdu 610065China Department of Central Transportation CenterWest China HospitalSichuan University/West China School of NursingSichuan UniversityChengdu 610065China Institute of Environmental EngineeringRWTH Aachen UniversityAachen 52072Germany Sichuan University Yinbin ParkYibin Institute of Industrial TechnologyYibin 644044China Laboratory of Wastewater Treatment Technology in Sichuan ProvinceHaitian Water GroupChengdu 610065China 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2021年第32卷第6期

页      面：2066-2072页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0817[工学-化学工程与技术] 081701[工学-化学工程] 0703[理学-化学] 

基　　金：financial support from Key R&D projects of the Sichuan Science and Technology Plan Project(No.19ZDYF0612) Guiding Plan for Transfer and Transformation of Scientific and Technological Achievements of Sichuan Science and technology plan project(No.20ZHSF0257) the National Natural Science Foundation of China(No.51878423)。 

主　　题：Zero-valent iron Oxidizer Redox Mechanisms p-Nitrophenol 

摘      要：It is well known that zero-valent iron(ZVI)could catalyze the oxidation of various oxidants to realize the rapid oxidation removal of pollutants.However,in this study,we found that the addition of different oxidants could regulate the redox function of ZVI system.In three different co-treatment systems,the effects of different oxidizers(peroxymonosulfate(PMS),persulfate(PDS),hydrogen peroxide(H_(2)O_(2)))dosages on the ratios of oxidative degradation rate and reductive degradation rate of p-nitrophenol(PNP)were studied.The effect of the H+released from oxidizers and the generated reactive oxygen species(ROS)in ZVI/PMS,ZVI/PDS,ZVI/H_(2)O_(2)systems were detailed discussed.Especially,the contribution of generated ROS for reductive degradation of PNP was quantified in the ZVI/H_(2)O_(2)system.Based on the results of TOC removal,UV-vis absorption spectra,and intermediates concentration curves,it was found that the degradation of PNP changed from reduction to oxidation with the increase of oxidant proportion.When the molar ratio of ZVI to oxidizer equal to 100,PNP was mainly degraded by reduction accompanied by slight oxidation.Combined with the results of SEM-EDS and XPS,it was confirmed that the enhanced degradation of PNP under the addition of oxidant was mainly related to the generated ROS,the additional H+,and the corrosion products of ZVI.