文献类型：期刊文献

英文题名：Application of ascorbic acid to enhance trichloroethene degradation by Fe(III)-activated calcium peroxide

作者：Zhang, Xiang[1]; Gu, Xiaogang[2]; Lu, Shuguang[1]; Brusseau, Mark L.[3]; Xu, Minhui[1]; Fu, Xiaori[1]; Qiu, Zhaofu[1]; Sui, Qian[1]

机构：[1] State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China; [2] Shanghai Urban Construction Design & Research Institute [Group] Co., Ltd, Shanghai, 200125, China; [3] Soil, Water and Environmental Science Department, School of Earth and Environmental Sciences, The University of Arizona, 429 Shantz Building, Tucson, AZ, 85721, United States

年份：2017

卷号：325

起止页码：188

外文期刊名：Chemical Engineering Journal

收录：EI(收录号：20172103685576)

语种：英文

外文关键词：Precipitation (chemical) - Calcium compounds - Electron spin resonance spectroscopy - Iron compounds - Degradation - Groundwater - Paramagnetic resonance - Peroxides - Remediation - Oxidation

摘要：The enhancement effect of an environmentally friendly reducing agent, ascorbic acid (AA), on trichloroethene (TCE) degradation by Fe(III)-activated calcium peroxide (CP) was evaluated. The addition of AA accelerated the transformation of Fe(III) to Fe(II), and the complexation of Fe(III)/Fe(II) with AA and its products alleviated the precipitation of dissolved iron. These impacts enhanced the generation of reactive oxygen species (ROSs). Investigation of ROSs using chemical probe tests, electron paramagnetic resonance (EPR) tests, and radical scavenger tests strongly confirm large production of hydroxyl radicals (HO[rad]) that is responsible for TCE degradation. The generation of Cl? from the degraded TCE was complete in the enhanced CP/Fe(III)/AA system. The investigation of solution matrix effects showed that the TCE degradation rate decreases with the increase in solution pH, while Cl?, SO42? and NO3? anions have minor impact. Conversely, HCO3? significantly inhibited TCE degradation due to pH elevation and HO[rad] scavenging. The results of experiments performed using actual groundwater indicated that an increase in reagent doses are required for effective TCE removal. In summary, the potential effectiveness of the CP/Fe(III)/AA oxidation system for remediation of TCE contaminated groundwater has been demonstrated. Additional research is needed to develop the system for practical implementation. ? 2017 Elsevier B.V.