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首页> 外文期刊>Separation and Purification Technology >Electrochemical oxidation process combined with UV photolysis for the mineralization of nitrophenol in saline wastewater
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Electrochemical oxidation process combined with UV photolysis for the mineralization of nitrophenol in saline wastewater

机译：电化学氧化结合紫外光解法处理含盐废水中的硝基苯酚

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摘要

As a preliminary treatment for the subsequent desalinization process, a combination of heterogeneous electrocatalysis and homogeneous photolysis is developed to mineralize bio-refractory organic pollutants in the wastewater with high salinity. A response surface methodology is used to assess the individual and interactive effects of several operating parameters (initial substrate concentration, pH, current density and Na2SO4 concentration) on the mineralization efficiency (the total organic carbon (TOC) removal rate) of p-nitrophenol. Based on the experimental results, a semi-empirical expression is proposed, allowing to predict and optimize the 5-h TOC removal rate. Both pH and current density are found to be the most significant positive factors that affected the combined process. With respect to the individual electro-catalysis and photolysis process, a synergetic effect on TOC removal rate is found in such a combined process. The oxygen generated by the parasite reaction of electrolysis process is recognized to play a predominant role in the synergetic effect. The degradation kinetics of PNP follows a pseudo-first-order kinetics model and features a higher degradation rate coefficient in alkaline medium and in an appropriate flowrate range. Through the LC-MS analysis of degradation products, the denitration and substitution by hydroxyl radicals on aromatic ring prove to be the first step for the degradation of PNP by the combined process.
机译：作为后续脱盐过程的初步处理，开发了异质电催化和均相光解相结合的方法，以使高盐度废水中的生物难降解有机污染物矿化。响应面方法用于评估几个操作参数（初始底物浓度，pH，电流密度和Na2SO4浓度）对对硝基苯酚的矿化效率（总有机碳（TOC）去除率）的单独和交互作用。根据实验结果，提出了一个半经验表达式，可以预测和优化5-h TOC去除率。发现pH和电流密度都是影响组合过程的最重要的积极因素。关于单独的电催化和光解过程，在这种组合过程中发现了对TOC去除速率的协同作用。电解过程中的寄生虫反应产生的氧气被认为在协同作用中起主要作用。 PNP的降解动力学遵循拟一级动力学模型，在碱性介质中和合适的流速范围内具有较高的降解速率系数。通过降解产物的LC-MS分析，证明了芳香环上的脱氮和被羟基自由基取代是联合工艺降解PNP的第一步。

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