水体系中十二烷基苯磺酸钠的光化学氧化动力学研究  

Kinetic study on photochemical oxidation of sodium dodecylbenzene sulfonate in aqueous solution

作　　者：单体兴[1] 高先池[1] 杨桂朋[1] 

机构地区：[1]中国海洋大学海洋化学理论与工程技术教育部重点实验室,山东青岛266100

出　　处：《海洋环境科学》2010年第3期387-391,共5页Marine Environmental Science

基　　金：教育部科学技术研究重点项目(105105);教育部新世纪优秀人才支持计划项目(NCET-04-0643);山东省"泰山学者"建设工程专项经费资助(JS200510016)

摘　　要：系统研究了在天然日光和高压汞灯照射下十二烷基苯磺酸钠（SDBS）在蒸馏水、人工海水和天然海水中的光降解情况。结果发现,SDBS的光化学氧化的速率会受到溶液介质、光源、重金属离子、光敏剂以及pH的影响。SDBS的光化学氧化反应符合一级动力学规律,其一级反应速率常数为0.0184 min-1～0.0281 min-1。SDBS在蒸馏水中的光降解速率大于在人工海水和天然海水中的光降解速率,其主要原因是蒸馏水中溶解更多的氧。天然海水中重金属离子Zn2＋和Cd2＋能加快SDBS的光氧化速率,光敏剂的加入也会加快SDBS的光氧化速率。此外,酸性条件下有利于SDBS的光降解。The photochemical degradation of sodium dodecylbenzene sulfonate（SDBS）was systematically studied in distilled water,artificial seawater and natural seawater under radiation of the high-pressure mercury lamp（HPML） or sunlight.The results showed that the photooxidation rates of SDBS were affected by the medium,lamp-house,heavy metal ions,photosensitizer and pH.The photochemical degradation of SDBS can be fitted with first-order reaction kinetics.The constants of the first-order reaction rate range from 0.0184 min-1 to 0.0281 min-1.The photolysis of SDBS was faster in distilled water than artificial seawater or natural seawater,presumably due to the more dissolved oxygen in distilled water.The Zn2＋or Cd2＋ added in seawater were increased the photo-oxidation rate of SDBS.The results also showed that the photosensitizers such as humic acid and acetone could enhance the photooxidation of SDBS.In addition,SDBS was more easily photo-degradated in acidic condition than alkaline condition.

关 键 词：十二烷基苯磺酸钠(SDBS) 光化学氧化 动力学 水溶液 

分 类 号：P734.2[天文地球—海洋化学]