Liquid-phase hydrodechlorination of trichloroethylene driven by nascent H_(2)under an open system:Hydrogenation activity,solvent effect and sulfur poisoning  

作　　者：Weilai Wang Fan Zhang Yunfei Zhang Lei Xu Yuansheng Pei Junfeng Niu 

机构地区：[1]State Key Laboratory of Water Environment Simulation,School of Environment,Beijing Normal University,Beijing 100875,China [2]Research Center for Eco-Environmental Engineering,Dongguan University of Technology,Dongguan 523808,China

出　　处：《Journal of Environmental Sciences》2021年第10期96-106,共11页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51878169);the Guangdong Innovation Team Project for Colleges and Universities(No.2016KCXTD023);Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme(2017);Guangdong Basic and Applied Basic Research Foundation(No.2019A1515110497)。

摘　　要：Hydrodechlorination is a promising technology for the remediation of water body contaminated with trichloroethylene(TCE).In this work,the liquid-phase hydrogenation of TCE by Raney Ni(R-Ni)and Pd/C under an open system have been studied,in which nascent H_(2)(Nas-H_(2))generated in situ from the cathode acted as a hydrogen source.Experimental results showed that TCE was completely eliminate from the solution through the synergistic effects of hydrodechlorination and air flotation due to the formation of continuous micro/nano-sized Nas-H_(2)bubbles from the cathode.Furthermore,the effects of inorganic anions and organic solvents on R-Ni and Pd/C hydrogenation activity were investigated,respectively.The results showed that NO_(3)^(-) and acetonitrile can form a competitive reaction with TCE;Sulfur with lone-pair electrons will cause irreversible poisoning to these two catalysts,and have a stronger inhibitory effect on Pd/C.This work helps to realize the separation of volatile halogenated compounds from water environment and provides certain data support for the choice of catalyst in the actual liquid-phase hydrogenation system.

关 键 词：Nascent H_(2) HYDROGENATION Air flotation TRICHLOROETHYLENE Sulfur poisoning 

分 类 号：X52[环境科学与工程—环境工程]