Decomposition of trichloroethylene and 2,4-dichlorophenol by ozonation in several organic solvents.
Decomposition of trichloroethylene and 2,4-dichlorophenol by ozonation in several organic solvents.
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DOI：
10.1016/j.chemosphere.2004.08.081
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发表时间：
2004-12
期刊：
影响因子：
8.8
通讯作者：
T. Tsai;K. Okawa;Y. Nakano;W. Nishijima;M. Okada
中科院分区：
文献类型：
--
作者：
T. Tsai;K. Okawa;Y. Nakano;W. Nishijima;M. Okada
研究了有机溶剂的化学性质对臭氧分解非解离性三氯乙烯（TCE）和解离性2,4-二氯苯酚（2,4- dcp）分解速率常数的影响。有机溶剂中臭氧化分解TCE和2,4- dcp的反应动力学与TCE或2,4- dcp浓度有关，服从一级反应动力学。非解离性TCE和解离性2,4- dcp在有机溶剂中的速率常数顺序不同，表明非解离性和解离性化合物的臭氧化速率取决于有机溶剂的化学性质。臭氧氧化对未解离的TCE的分解是一个简单的亲电反应，该反应与溶剂的受体数（AN）有关。另一方面，解离性2,4- dcp的分解依赖于化合物的解离，并与溶剂的供体数（DN）有关。最后，乙酸中的TCE转化为氯化中间体和氯离子，然后这些中间体不断被氧化为氯气。
The effects of chemical characteristics of organic solvents on the decomposition rate constants of undissociative trichloroethylene (TCE) and dissociative 2,4-dichlorophenol (2,4-DCP) by ozonation were studied. The TCE and 2,4-DCP decomposition by ozonation in organic solvents followed to the first-order reaction kinetics with respect to TCE or 2,4-DCP concentration. The orders of the rate constants among organic solvents for undissociative TCE and dissociative 2,4-DCP were different indicating that the ozonation rates for undissociative and dissociative compounds were dependent on the chemical property of organic solvent. The decomposition of undissociative TCE by ozonation was a simple electrophilic reaction, which was dependent on acceptor number (AN) of the solvent. On the other hand, the decomposition of dissociative 2,4-DCP was dependent on by the dissociation of the compounds and would be dependent on donor number (DN) of the solvent. Finally, TCE in acetic acid was transformed to chlorinated intermediates and chloride ion and then these intermediates were continuously oxidized to chlorine gas.