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首页> 外文期刊>Journal of Colloid and Interface Science >Dechlorination of chlorophenols by magnesium-silver bimetallic system
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Dechlorination of chlorophenols by magnesium-silver bimetallic system

机译：镁银双金属体系对氯酚的脱氯

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摘要

More than 85% of 10 mg L-1 of pentachlorophenol (PCP) was removed by magnesium/silver (206/1.47 mM) bimetal system in the presence of acetic acid. Dechlorination was found to be sequential and phenol was identified as the ultimate hydrocarbon skeleton along with some accumulation of tetra-, tri-, and dichlorophenols. The dechlorination reaction was found to follow second-order kinetics. Lower PCP removal efficiency (35%) was observed when the reaction was carried out in the absence of acid using Mg-0/Ag system. When the reaction was conducted using Mg-0 alone in the presence of acid, substantial sorption Of PCP Occurred with very low efficiency of PCP dechlorination. Dechlorination studies on 10 mg L-1 initial concentrations of 2,3,4,6-tetrachlorophenol (2,3,4,6-TeCP) and 2,4,5-trichlorophenol (2,4,5-TCP), under identical conditions as to PCP, revealed that dechlorination efficiency and reaction rate constants decrease with decreasing number of chlorine atoms on the target compound. A correlation (R-2 > 0.9) between the dechlorination rate constants and E-LUMO for chlorophenols was obtained. (c) 2006 Elsevier Inc. All rights reserved.
机译：在乙酸存在下，通过镁/银（206 / 1.47 mM）双金属系统除去了超过85％的10 mg L-1五氯苯酚（PCP）。发现脱氯是连续的，苯酚与四，三和二氯苯酚的一些积累一起被确定为最终的烃骨架。发现该脱氯反应遵循二级动力学。当使用Mg-0 / Ag体系在无酸条件下进行反应时，观察到较低的PCP去除效率（35％）。当在酸存在下仅使用Mg-0进行反应时，发生PCP大量吸附，而PCP脱氯效率非常低。在以下条件下对10 mg L-1初始浓度的2,3,4,6-四氯苯酚（2,3,4,6-TeCP）和2,4,5-三氯苯酚（2,4,5-TCP）进行脱氯研究与PCP相同的条件表明，脱氯效率和反应速率常数随目标化合物上氯原子数量的减少而降低。获得了氯酚的脱氯速率常数与E-LUMO之间的相关性（R-2> 0.9）。 （c）2006 Elsevier Inc.保留所有权利。

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