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O3氧化去除水中残杀威效果与机理
发表时间：2012-12-31 浏览量：1773 下载量：458
| 全部作者： | 沈吉敏，高国瀛，何雷，陈忠林 |
| 作者单位： | 哈尔滨工业大学市政环境工程学院，城市水资源与水环境国家重点实验室 |
| 摘 要： | 利用KMnO4、氯、O3及粉末活性炭(powdered activated carbon, PAC)对极性极大的消杀剂残杀威（propoxur；o-isopropoxyphenyl methylcarbamate，PHC）的去除能力进行考察，发现除O3以外，其他几种方法都不能很好地去除水中的PHC. 对O3氧化降解水中PHC的影响因素、动力学和机理进行研究，发现pH值、碳酸盐、羟基自由基抑制叔丁醇对O3氧化PHC的过程影响显著，说明O3氧化去除PHC受羟基自由基控制。动力学研究表明：O3分子与PHC的直接反应速率常数kD为38 L/(mol·s)；O3氧化去除水中PHC的表观速率kobs随pH值的升高而升高，室温条件下pH值为6.4，7.1，7.4，7.8，其对应的kobs分别为125，199，241，533 L/(mol·s)，PHC O3氧化过程中可能生成羟基PHC或脱甲基生成2-异丙氧基苯基氨基甲酸酯。 |
| 关 键 词： | 环境科学技术其他学科；O3氧化；残杀威；动力学；降解机理 |
| Title： | Effect and mechanism of ozonation degradation of propoxur in aqueous solution |
| Author： | SHEN Jimin, GAO Guoying, HE Lei, CHEN Zhonglin |
| Organization： | State Key Laboratory of Urban Water Resource and Environment, School of Municipal & Environmental Engineering, Harbin Institute of Technology |
| Abstract： | The present study investigates the degradation of very large polar propoxur (o-isopropoxyphenyl methylcarbamate，PHC) with potassium permanganate, chlorine, ozone and powdered activated carbon (PAC). The experimental results indicate that only ozone has a good removal efficiency on propoxur. The factors, kinetics and mechanism have been studied during the ozonation of propoxur. The results show that pH, carbonate and the radical inhibitor tertiary butyl alcohol affect the ozonation process of propoxur significantly, indicating the ozonation of propoxur is controlled by the radical inhibitor tertiary butyl alcohol. Kinetic studies have shown that the rate constant of the reaction of ozone with propoxur was found to be 38 L/(mol·s), the corresponding apparent rate constant was increased as pH increased. At room temperature, the corresponding apparent rate constant kobs for pH 6.4, 7.1, 7.4 and 7.8 were 125, 199, 241 and 533 L/(mol·s) respectively. The main degradation products identified were hydroxy propoxur or demethylation generation 2-isopropoxy-phenyl carbamate. |
| Key words： | other subjects of environmental science and technology; ozonation; propoxur; kinetics; mechanism of degradation |
| 发表期数： | 2012年12月第24期 |
| 引用格式： | 沈吉敏，高国瀛，何雷，等. O3氧化去除水中残杀威效果与机理[J]. 中国科技论文在线精品论文，2012，5（24）：2385-2392. |
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