The influence of pH on the degradation of phenol and chlorophenols by potassium ferrate
The influence of pH on the degradation of phenol and chlorophenols by potassium ferrate
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DOI：
10.1016/j.chemosphere.2004.04.060
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发表时间：
2004-09-01
期刊：
影响因子：
8.8
通讯作者：
Ma, J
中科院分区：
文献类型：
--
作者：
Graham, N;Jiang, CC;Ma, J
本文研究了溶液pH对高铁酸钾与苯酚、对氯苯酚(Cl1)、2，4-二氯苯酚(DCP)、2，4，6-三氯苯酚(2，4，6-TCP)的水溶液反应的影响。高铁酸根离子的氧化还原电位和水溶液稳定性，以及解离化合物的反应性，都与pH有关。实验室测试的范围很广，包括pH值(5.8-11)和反应物浓度(高铁酸盐：化合物摩尔比为1：1到8：1)。由于三氯乙烯的非解离性质，还考察了其作为参比化合物的反应活性。高铁酸盐对化合物的降解程度与pH高度相关，最适pH(最大降解量)的大小顺序为：苯酚/CP、DCP、TCP；在最适pH下，这些化合物的降解程度相似。结果表明，对于所研究的苯酚和氯苯酚基团，氯取代基原子的增加对应着未解离化合物的反应性增加，而解离化合物的反应性降低。(C)2004爱思唯尔有限公司。保留所有权利。
This paper presents information concerning the influence of solution pH on the aqueous reaction between potassium ferrate and phenol and three chlorinated phenols: 4-chlorophenol (Cl?), 2,4-dichlorophenol (DCP), 2,4,6-trichlorophenol (TCP). The redox potential and aqueous stability of the ferrate ion, and the reactivity of dissociating compounds, are known to be pH dependent. Laboratory tests have been undertaken over a wide range of pH (5.8-11) and reactant concentrations (ferrate: compound molar ratios of 1:1 to 8:1). The reactivity of trichloroethylene was also investigated as a reference compound owing to its non-dissociating nature. The extent of compound degradation by ferrate was found to be highly pH dependent, and the optimal pH (maximum degradation) decreased in the order: phenol/CP, DCP, TCP; at the optimal pH the degree of degradation of these compounds was similar. The results indicate that for the group of phenol and chlorophenols studied, the presence of an increasing number of chlorine substituent atoms corresponds to an increasing reactivity of the undissociated compound, and a decreasing reactivity of the dissociated compound. (C) 2004 Elsevier Ltd. All rights reserved.