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首页> 外文期刊>Journal of Hazardous Materials >Dechlorination of chlorophenols using magnesium-palladium bimetallic system
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Dechlorination of chlorophenols using magnesium-palladium bimetallic system

机译：镁钯双金属体系对氯酚的脱氯

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Ninety-four percent removal of 10 mg L~(-1) of pentachlorophenol (PCP) was achieved by treatment with 154.5 mM Mg~0 and 0.063 mM K_2PdCl_6 in the presence of 175 mM acetic acid in 1 h reaction time. Dechlorination of PCP was found to be sequential and phenol was identified as the end product along with accumulation of trace concentrations of tetra- and trichlorophenols. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) revealed that palladium in its metallic form (Pd~0) produced by reduction of Pd~(4+), was spatially separated from magnesium granules when acid was included in the reaction. These colloidal palladium particles generated active reductive species of hydrogen and dechlorinated chlorophenols. In the absence of acid, the efficiency of dechlorination of PCP by Pd/Mg~0 system was very low and chief mechanism of removal of the compound was through sorption onto solid surfaces. Thus, it was important to include acid in the system to: (a) facilitate corrosion of Mg~0 and reduction of Pd~(4+) to Pd~0, (b) provision of protons to produce H_2, (c) retard formation of insoluble oxides and hydroxides that may deposit on the magnesium granules and sorb PCP and its partially dechlorinated products and. Application of 154.5 mM Mg~0/0.063 mM K_2PdCl_6 on PCP, 2,4,5-trichlorophenol (TCP) and 2-chlorophenol (MCP) with organic chloride equivalence showed that the rate and extent of removal increased with decrease in number of chlorine atoms on phenol.
机译：在175 mM乙酸存在下，在1 h反应时间内，用154.5 mM Mg〜0和0.063 mM K_2PdCl_6处理，可去除10 mg L〜（-1）五氯苯酚（PCP）94％。发现五氯苯酚的脱氯是连续的，苯酚与痕量浓度的四氯苯酚和三氯苯酚一起被鉴定为最终产物。扫描电子显微镜（SEM）和能量色散X射线光谱（EDX）分析表明，当酸中包含Pd〜（4+）时，还原成Pd〜（4+）的金属形式的钯（Pd〜0）在空间上与镁颗粒分离。反应。这些胶体钯颗粒产生了氢和脱氯氯酚的活性还原物种。在不存在酸的情况下，Pd / Mg〜0体系对PCP的脱氯效率非常低，去除该化合物的主要机理是通过吸附在固体表面上。因此，重要的是在系统中加入酸，以：（a）促进Mg〜0的腐蚀和Pd〜（4+）还原为Pd〜0，（b）提供质子产生H_2，（c）阻滞形成不溶性氧化物和氢氧化物，可能沉积在镁颗粒上并吸收PCP及其部分脱氯产物；以及。 154.5 mM Mg〜0 / 0.063 mM K_2PdCl_6在具有有机氯当量的PCP，2,4,5-三氯苯酚（TCP）和2-氯苯酚（MCP）上的应用表明，去除率和程度随氯数量的减少而增加苯酚上的原子。

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