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首页> 外文期刊>Environmental toxicology and chemistry >Oxidation kinetics of pentachlorophenol by manganese dioxide.
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Oxidation kinetics of pentachlorophenol by manganese dioxide.

机译：二氧化锰对五氯苯酚的氧化动力学。

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摘要

This study examined the abiotic transformation kinetics of pentachlorophenol (PCP) by manganese dioxide (MnO2) at different solution chemistry and initial concentrations of PCP and MnO2. The measured PCP transformation rates were found to be on the order of 1.07 with respect to [PCP] and 0.91 and 0.87 with respect to [MnO2] and [H+], respectively. Dissolved Mn2+ and Ca2+ as background electrolytes considerably decreased the reaction rate because of their adsorption and hence blocking of active sites on MnO2 surfaces. The dechlorination number, 0.59 chloride ions per transformed PCP after a 1-h reaction, suggests that a fraction of the transformed PCP was not dechlorinated and may be coupled directly to dimeric products. Gas chromatography/ mass spectrometry and liquid chromatography/mass spectrometry/mass spectrometry techniques were used to identify two isomeric nonachlorohydroxybiphenylethers as major products and 2,3,5,6-tetrachloro-1,4-hydroquinone and tetrachlorocatechol as minor products. Productidentification suggested that the reaction may include two parallel reactions to form either dimers or 2,3,5,6-tetrachloro-1,4-hydroquinone and tetrachlorocatechol via simultaneous dehydrochlorination and hydroxylation.
机译：这项研究检查了二氧化锰（MnO2）在不同溶液化学和PCP和MnO2的初始浓度下五氯苯酚（PCP）的非生物转化动力学。发现测得的PCP转化率相对于[PCP]约为1.07，相对于[MnO2]和[H +]约为0.91和0.87。溶解的Mn2 +和Ca2 +作为背景电解质，由于它们的吸附，因此阻塞了MnO2表面上的活性位，因此大大降低了反应速率。在1小时的反应后，每份转化的PCP的脱氯数为0.59个氯离子，这表明一部分转化的PCP未被脱氯，可以直接与二聚产物偶联。气相色谱/质谱和液相色谱/质谱/质谱技术用于鉴定两种异构的九氯羟基联苯醚为主要产物，而2,3,5,6-四氯-1,4-对苯二酚和四氯邻苯二酚为次要产物。产品鉴定表明该反应可包括两个平行反应，通过同时脱氯化氢和羟基化反应形成二聚物或2,3,5,6-四氯-1,4-氢醌和四氯邻苯二酚。

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