TY - JOUR
ID - 10.1016/j.jes.2021.02.015
TI - Liquid-phase hydrodechlorination of trichloroethylene driven by nascent H2 under an open system: Hydrogenation activity, solvent effect and sulfur poisoning
AU - Weilai Wang
AU - Fan Zhang
AU - Yunfei Zhang
AU - Lei Xu
AU - Yuansheng Pei
AU - Junfeng Niu
VL - 33
IS - 10
PB -
SP - 96
EP - 106
PY -
JF - Journal of Environmental Sciences
JA - J. Environ. Sci.
UR - http://www.jesc.ac.cn/jesc_en/ch/reader/view_abstract.aspx?file_no=S1001074221000619&flag=1
KW - Corresponding author.;Hydrogenation;Air flotation;Trichloroethylene;Sulfur poisoning
AB - 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 H2 (Nas-H2) 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-H2 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 NO3− 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.
ER -