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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Electrodecomposition in Subcritical Water Using o-Xylene as a Model for Benzene, Toluene, Ethylbenzene, and Xylene Pollutants
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Electrodecomposition in Subcritical Water Using o-Xylene as a Model for Benzene, Toluene, Ethylbenzene, and Xylene Pollutants

机译：使用邻二甲苯作为苯，甲苯，乙苯和二甲苯污染物的模型在亚临界水中进行电分解

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摘要

The possibility of the combination of electrolysis and subcritical water as a novel electrolyte was investigated. A stainless steel reactor was used as an undivided electrochemical cell containing platinum as the anode and a stainless steel reactor as the cathode. At first, the effect of temperature on the electrolysis current as the main parameter was studied in a cell containing only pure water and a supporting electrolyte. It was realized that the electrolysis current (and, consequently, the electrolysis efficiency) increased linearly with temperature because of the change in viscosity and other physicochemical properties of subcritical water. As a result, at 553 K the electrolysis efficiency was over 14-fold higher than that under ambient conditions. The possibility of the applicability of the above combined techniques for the decomposition of o-xylene was also followed as a model for benzene, toluene, ethylbenzene, and xylene (BTEX) compounds. The effect of experimental conditions such as the electrolysis duration, the electrolysis voltage, and the temperature of subcritical water was investigated. Several decomposed products were identified. o-Xylene was directly electro-oxidized to 2-methylbenzyl alcohol and consecutively to the other oxidation products. Also, hydroxide ions were oxidized to oxygen molecules, where hydrogen was generated on the cathodic surface. The final oxidation product of the electro-oxidation reaction was identified as carbon dioxide. The results indicate that more than 95% of o-xylene can be decomposed under optimum conditions.
机译：研究了将电解和亚临界水组合作为一种新型电解质的可能性。不锈钢反应器用作不分隔的电化学电池，其中铂作为阳极，不锈钢反应器作为阴极。首先，在仅包含纯水和支持电解质的电池中研究了温度对电解电流的影响，这是主要参数。已经认识到，由于亚临界水的粘度和其他物理化学性质的变化，电解电流（以及因此的电解效率）随温度线性增加。结果，在553 K时，电解效率比在环境条件下高14倍以上。作为苯，甲苯，乙苯和二甲苯（BTEX）化合物的模型，还遵循了上述组合技术对邻二甲苯分解的适用性的可能性。研究了实验条件如电解时间，电解电压和亚临界水温度的影响。确定了几种分解产物。邻二甲苯被直接电氧化为2-甲基苄醇，然后被连续氧化为其他氧化产物。另外，氢氧根离子被氧化成氧分子，在阴极表面产生氢。电氧化反应的最终氧化产物被鉴定为二氧化碳。结果表明，在最佳条件下，可以分解超过95％的邻二甲苯。

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