T:Toxic;
79-01-6Relevant articles and documents
Kirchhoff,K. et al.
, p. 3861 - 3864 (1967)
Cloning of a novel dehalogenase from environmental DNA
Kimoto, Hisashi,Suye, Shin-Ichiro,Makishima, Hirokazu,Arai, Jun-Ichirou,Yamaguchi, Sachiko,Fujii, Yutaka,Yoshioka, Toshihito,Taketo, Akira
, p. 1290 - 1292 (2010)
Cloning of pce A, the gene of tetrachloroethene (PCE)- reductive dehalogenase, was undertaken from environmental DNA. Two genes were amplified using PCR primer deduced from pee A. Functional expression of these genes was unsuccessful in Escherichia coli, but PceA1 synthesized in vitro was enzymatically active. In recombinant E. coli, PceA1 formed a complex with host DnaK and caused filamentous growth.
Reductive dechlorination of tetrachloroethylene in soils by Fe(II)-based degradative solidification/stabilization
Hwang,Batchelor
, p. 3792 - 3797 (2001)
Fe(II)-based degradative solidification/stabilization (DS/S) is a modification of conventional solidification/stabilization (S/S) that uses Fe(II) as a reducing agent for chlorinated organics while immobilizing inorganic contaminants. Feasibility of the Fe(II)-based DS/S technology in treating soils contaminated with tetrachloroethylene (PCE) was tested in this study. The results of the PCE degradation experiments conducted in the presence of a humic acid suggest that natural organic matter would not significantly interfere with the degradative reaction by the Fe(II)-containing reactive species in DS/S systems. Solid-phase degradation experiments showed that the DS/S technology could effectively treat PCE in soils without substantial production of chlorinated intermediates. A pseudo-first-order rate law reasonably described degradation kinetics. The half-lives of PCE ranged from 13 to 335 days, which are within time spans allowable for typical in-situ DS/S application. Trichloroethylene (TCE) was the only chlorinated product observed in the solid-phase experiments, and its presence was generally transitory with the amount being less than 7% of the initial amount of PCE on a molar basis. A surface reaction appears to control observed PCE degradation kinetics rather than mass transfer to the reactive surface.
IR spectroscopic study of the dichloromethyl peroxyl radical and its deuterated analogs in the argon matrix
Baskir, E. G.,Nefedov, O. M.
, p. 2236 - 2240 (2022/01/22)
The dichloromethyl peroxyl radical (CHCl2OO?) and its deuterated analog formed in the reaction of the corresponding dichloromethyl radicals with O2 were studied by matrix IR spectroscopy. Dichloromethyl radicals are genera
Rational design of CrOx/LaSrMnCoO6 composite catalysts with superior chlorine tolerance and stability for 1,2-dichloroethane deep destruction
Tian, Mingjiao,Jian, Yanfei,Ma, Mudi,He, Chi,Chen, Changwei,Liu, Chao,Shi, Jian-Wen
, p. 62 - 72 (2018/11/24)
1,2-dichloroethane (1,2-DCE) is a representative industrial chlorinated volatile organic compound (CVOC) making great hazardous to the environment and human health. In this work, LaSrMnCoO6 (LSMC) double perovskite-type materials with high thermal stability and coke resistance in 1,2-DCE oxidation were prepared by a facile sol-gel method. Based on this, a series of CrOx/LaSrMnCoO6 catalysts (Cr/LSMC, CrOx loading = 5 to 20 wt.%) which combine the merits of CrOx (high activity and chlorine tolerance) and LaSrMnCoO6 were synthesized and adopted in deep oxidation of 1,2-DCE for the first time. As expected, obvious synergistic effects between CrOx and LSMC on 1,2-DCE destruction were observed. Amongst, 10 wt.% CrOx/LaSrMnCoO6 (10Cr/LSMC) shows the best catalytic activity with 90% of 1,2-DCE destructed at 400 °C. Furthermore, the outstanding catalytic durability and water resistance of 10Cr/LSMC in 1,2-DCE oxidation were also demonstrated. In addition to this, the reaction pathway of 1,2-DCE decomposition over Cr/LSMC materials was discussed based on the results of online product analysis. We found that the enhanced catalytic performance of Cr/LSMC materials can be reasonably attributed to their high reducibility, excellent 1,2-DCE adsorption capability, and large amounts of surface active lattice oxygen species. It can be anticipated that the Cr/LSMC catalysts are promising materials for CVOC elimination and the results from this work could also provide some new insights into the design of catalysts for CVOC efficient destruction.
Chlorination reactions relevant to the manufacture of trichloroethene and tetrachloroethene; Part 2: Effects of chlorine supply
Sutherland, Iain W.,Hamilton, Neil G.,Dudman, Christopher C.,Jones, Peter,Lennon, David,Winfield, John M.
, p. 149 - 156 (2014/04/03)
The behaviour of 1,1,2,2-tetrachloroethane and trichloroethene in chlorination reactions where the supply of chlorine is varied, either by change in chlorocarbon: Cl2 feed ratio or the quantity of supported copper(II) chloride catalyst or by the use of an anhydrous hydrogen chloride/dioxygen feed as the source of chlorine, i.e. oxychlorination conditions, is described. Depending on the exact conditions used, the products are trichloroethene, pentachloroethane or tetrachloroethene. The products and the conditions under which they are observed are both in harmony with a previously proposed reaction scheme in which there is interplay between heterogeneous and homogeneous reactions. It is possible to define sets of reaction conditions which lead to improvements in selectivity towards the formation of either CHCl=CCl2 or CCl2=CCl2 without significant formation of oligomeric species.
