文献类型：期刊文献

英文题名：Synergistic Catalysis of Tungsten Disulfide and Manganese Ions for the Degradation of Dimethyl Disulfide Using Chlorine Dioxide

作者：Zhao, Tao[1]; Zhang, Pengkang[1]; Ma, Lijuan[1]; Wei, Shihao[1]; Qiu, Yangming[1]; Liu, Bangguo[1]; Chen, Xiurong[1,2]

机构：[1] National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20230430263)

语种：英文

外文关键词：Catalytic oxidation - Chlorine compounds - Density functional theory - Manganese compounds - Pesticides - Reaction rates - Tungsten compounds

摘要：Dimethyl disulfide (DMDS) is a familiar odorant found at chemical and pesticide sites, characterized by a low odor threshold and high volatility. In this study, a catalytic degradation system for DMDS using ClO2/Mn2+/WS2 was developed. The residual rate of DMDS decreased to 10.58% within 80 min under the following reaction conditions: 400 μM ClO2, 20 μM Mn2+, 80 μM WS2, and a pH of 7.0. XPS analysis confirmed the co-catalytic synergistic effect of WS2 and Mn2+. The metal valence cycling is the primary factor that enhances the activation of ClO2 for DMDS degradation. EPR tests and quenching experiments investigated the critical reactive oxygen species (ROS) in the reaction process, including 1O2, ·OH, and ClO2. In the initial 10 min of the fast reaction stage, 1O2 (44.48% reaction rate contribution) and ClO2 (55.52% reaction rate contribution) played the primary oxidation roles. ·OH (49.16% reaction rate contribution) and ClO2 (50.84% reaction rate contribution) became dominant during the slower reaction stage in the last 70 min. Further, density functional theory (DFT) calculations, in conjunction with GC-MS and ICS analyses, were used to predict potential degradation pathways of DMDS. This study presents a practical approach for efficiently removing DMDS in pesticide facilities and chemical industrial parks. ? 2023, The Authors. All rights reserved.