• 关键词：复合光催化剂(MWNTs/TiO₂)  氯苯类化合物  光催化降解  动力学  路径

• 基金项目：国家自然科学基金资助项目(No.50778065);湖南省科学计划资助项目(No.2010SK3042);湖南省教育厅重点科研资助项目(No. 11A022)

• 张伟
• 1. 湖南城市学院城市建设系,益阳 413000;
  2. 湖南大学土木工程学院,长沙 410082;
  3. 湖南大学建筑安全与节能教育部重点实验室,长沙 410082

• 李黎武
• 湖南城市学院城市建设系,益阳 413000

• 张茜
• 1. 湖南大学土木工程学院,长沙 410082;
  2. 湖南大学建筑安全与节能教育部重点实验室,长沙 410082

• 徐舜开
• 1. 湖南大学土木工程学院,长沙 410082;
  2. 湖南大学建筑安全与节能教育部重点实验室,长沙 410082

• 张骅
• 1. 湖南大学土木工程学院,长沙 410082;
  2. 湖南大学建筑安全与节能教育部重点实验室,长沙 410082

• 摘要：研究复合光催化剂MWNTs/TiO₂对典型氯苯类有机化合物光催化降解动力学及主要光降解路径.结果表明,同一初始浓度和相同光催化降解实验条件下,60 min时典型氯苯类有机化合物的光降解率均达到90%以上.其中六氯苯和五氯苯的光催化降解速率常数分别为0.0664 h^-1和0.0670 h^-1,其大小明显高于其它氯苯类化合物.1,4-二氯苯的光催化降解反应速率常数仅为0.0430 h^-1,在典型氯苯类化合物中最小.三氯苯的3种同分异构体——1,2,3-三氯苯、1,2,4-三氯苯和1,3,5-三氯苯的光催化降解速率常数分别为0.0547 h^-1、0.0445 h^-1和0.0439 h^-1.六氯苯的主要光催化降解路径为:HCB→PeCB→1,2,4,5-TeCB→1,2,4-TCB→1,4-DCB.

• Abstract：The photodegradation kinetics and the main photodegradation process of typical chlorobenzene compounds by Multi-walled Carbon Nanotubes coated with titanium dioxide (MWNTs/TiO₂) were investigated. The results showed that the photodegradation rate of the typical chlorobenzene compounds could achieve 90% at 60 min with the same initial concentration and experimental conditions of photodegradation. The photodegradation rate constants of hexachlorobenzene (HCB) and pentachlorobenzene (PeCB) were 0.0664 h^-1 and 0.0670 h^-1, respectively, which were significantly higher than that of the other chlorobenzene compounds. However, the photodegradation rate constant of 1,4-dichlorobenzene (DCB) was only 0.0430 h^-1, which was the lowest within all the typical chlorobenzene compounds. The photodegradation rate constants of the three isomers of trichlorobenzene (TCB) were 0.0547 h^-1, 0.0445 h^-1 and 0.0439 h^-1 for 1,2,3-TCB, 1,2,4-TCB, and 1,3,5-TCB, respectively. The main photodegradation process of HCB was: HCB→PeCB→ 1,2,4,5-TeCB→1,2,4-TCB→1,4-DCB.

• Key words：composite photocatalysts(MWNTs/TiO₂)  chlorobenzenes  photocatalytic degradation  kinetic  process

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