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首页> 外文期刊>Journal of Hazardous Materials >Effects of solvent, pH, salts and resin fatty acids on the dechlorination of pentachlorophenol using magnesium-silver and magnesium-palladium bimetallic systems
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Effects of solvent, pH, salts and resin fatty acids on the dechlorination of pentachlorophenol using magnesium-silver and magnesium-palladium bimetallic systems

机译：溶剂，pH，盐和树脂脂肪酸对镁银和镁钯双金属体系对五氯苯酚脱氯的影响

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摘要

The effects of pH, organic co-solvent, salts such as sodium chloride, sodium sulfate, and co-pollutants, resin and fatty acids (RFAs) on the dechlorination of pentachlorophenol (PCP) by magnesium/silver (Mg/Ag) and magnesium/palladium (Mg/Pd) systems were examined in the present investigations. Such studies provide relevant information about the applicability of bimetallic systems for remediation of raw wastewaters (such as pulp bleaching effluents) or groundwater. Removal efficiencies of 10mgL~(-1) PCP by Mg/Pd and Mg/Ag systems at the end of 1 h reaction were 93% and 78%, respectively, in the presence of acetone (1% v/v). On the other hand, the removal efficiencies were 86% and 70% for reactions conducted in alcoholic solvents (1% v/v) using Mg/Pd and Mg/Ag systems, respectively. The efficiencies of PCP removal by the two bimetallic systems could be correlated to the dipole moments of co-solvents used. The second order reaction rate constant for PCP removal by Mg/Ag system was highest (0.03 L mg~(-1) min~(-1)) in the absence of any pH-control mechanism. Optimum pH for the dechlorination of PCP by Mg/Pd system was found to be ～5.5 and > 92% of the compound was removed within 15 min of reaction. Presence of chlorinated and non-chlorinated resin fatty acids (RFAs) resulted in substantial reduction in the rate and extent of PCP removal by Mg/Ag system whereas dechlorination by Mg/Pd remained unaffected. Presence of sodium sulfate or sodium chloride in the reaction phase reduced the rate and extent of PCP removal by Mg/Ag system. PCP dechlorination by Mg/Pd system was adversely impacted by the addition of sodium chloride and unaffected by the presence of sodium sulfate.
机译：pH，有机助溶剂，氯化钠，硫酸钠等盐和助污染物，树脂和脂肪酸（RFA）对五氯苯酚（PCP）镁/银（Mg / Ag）和镁脱氯的影响在本研究中对钯（Mg / Pd）系统进行了检查。此类研究提供了有关双金属系统对原废水（例如纸浆漂白废水）或地下水的修复性适用性的相关信息。在丙酮（1％v / v）存在下，反应1 h结束时，Mg / Pd和Mg / Ag系统去除10mgL〜（-1）PCP的效率分别为93％和78％。另一方面，在含Mg / Pd和Mg / Ag体系的含酒精溶剂（1％v / v）中进行的反应的去除效率分别为86％和70％。两种双金属系统去除PCP的效率可能与所用助溶剂的偶极矩相关。在没有任何pH控制机制的情况下，Mg / Ag体系去除PCP的二级反应速率常数最高（0.03 L mg〜（-1）min〜（-1））。通过Mg / Pd体系对PCP进行脱氯的最佳pH值约为5.5，在15分钟内去除了92％以上的化合物。氯化和非氯化树脂脂肪酸（RFA）的存在导致Mg / Ag系统去除PCP的速率和程度大大降低，而Mg / Pd脱氯的效果仍然不受影响。反应阶段中硫酸钠或氯化钠的存在降低了Mg / Ag体系去除PCP的速度和程度。 Mg / Pd体系对PCP的脱氯反应受到氯化钠添加的不利影响，并且不受硫酸钠存在的影响。

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