Degradation of vinyl chloride (VC) by the sulfite/UV advanced reduction process (ARP): effects of process variables and a kinetic model.
Degradation of vinyl chloride (VC) by the sulfite/UV advanced reduction process (ARP): effects of process variables and a kinetic model.
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DOI：
10.1016/j.scitotenv.2013.03.060
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发表时间：
2013-06
期刊：
影响因子：
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通讯作者：
Xu Liu;S. Yoon;B. Batchelor;A. Abdel-Wahab
中科院分区：
文献类型：
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作者：
Xu Liu;S. Yoon;B. Batchelor;A. Abdel-Wahab
氯乙烯（VC）由于其毒性和致癌性对人类和环境构成威胁。在这项研究中，先进的还原工艺（阿普），结合亚硫酸盐和紫外线光破坏VC。VC的降解符合准一级动力学，考察了几种实验因素对降解速率常数的影响。最大的速率常数在pH 9时观察到，但完全脱氯在pH 11时获得。较高的亚硫酸盐剂量和光照强度，发现增加速率常数线性。当VC初始浓度低于1.5mg/L时，反应速率常数略有下降，随后在1.5 ~ 3.1mg/L之间基本保持不变。提出了亚硫酸盐光解产生的活性物种与VC反应的降解机理。一个动力学模型，描述了系统中的主要反应，并能够解释的依赖性的速率常数的实验因素检查。本研究为多种卤代污染物的去除提供了一种新的处理技术。
Vinyl chloride (VC) poses a threat to humans and environment due to its toxicity and carcinogenicity. In this study, an advanced reduction process (ARP) that combines sulfite with UV light was developed to destroy VC. The degradation of VC followed pseudo-first-order decay kinetics and the effects of several experimental factors on the degradation rate constant were investigated. The largest rate constant was observed at pH9, but complete dechlorination was obtained at pH11. Higher sulfite dose and light intensity were found to increase the rate constant linearly. The rate constant had a little drop when the initial VC concentration was below 1.5mg/L and then was approximately constant between 1.5mg/L and 3.1mg/L. A degradation mechanism was proposed to describe reactions between VC and the reactive species that were produced by the photolysis of sulfite. A kinetic model that described major reactions in the system was developed and was able to explain the dependence of the rate constant on the experimental factors examined. This study may provide a new treatment technology for the removal of a variety of halogenated contaminants.