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| MWNTs/TiO2对典型氯苯类化合物的光催化降解研究 | |
| 引用本文： | 张伟,李黎武,张茜,徐舜开,张骅.MWNTs/TiO2对典型氯苯类化合物的光催化降解研究[J].环境科学学报,2012,32(3):631-638. |
| 作者姓名： | 张伟 李黎武 张茜 徐舜开 张骅 |
| 作者单位： | 1. 湖南城市学院城市建设系,益阳413000／湖南大学土木工程学院,长沙410082／湖南大学建筑安全与节能教育部重点实验室,长沙410082 2. 湖南城市学院城市建设系,益阳,413000 3. 湖南大学土木工程学院,长沙410082／湖南大学建筑安全与节能教育部重点实验室,长沙410082 |
| 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) |
| 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,60min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0.0664h-1和0.0670h-1,其大小明显高于其它氯苯类化合物.1,二氯苯的光催化降解反应速率常数仅为0.0430h4--1,在典型氯苯类化合物中最小.三氯苯的3种同分异构体——1,3-三氯苯、24-三氯苯和1,5-三氯苯的光催化降解速率常数分别为0.0547h2,1,,3,-1、0445h0.-1和0.0439h-1.六氯苯的主要光催化降解路径为:HCB→PeCB→1,2,3,5-TeCB→1,2,4-TCB→1,4-DCB. |
| 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 |
| 收稿时间： | 2011/7/19 0:00:00 |
| 修稿时间： | 2011/9/22 0:00:00 |
Study on photocatalytic degradation of typical chlorobenzenes with MWNTs/TiO2 |
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| ZHANG Wei,LI Liwu,ZHANG Qian,XU Shunkai and ZHANG Hua.Study on photocatalytic degradation of typical chlorobenzenes with MWNTs/TiO2[J].Acta Scientiae Circumstantiae,2012,32(3):631-638. | |
| Authors: | ZHANG Wei LI Liwu ZHANG Qian XU Shunkai and ZHANG Hua |
| Institution: | 1. Department of Auburn Construction, Hunan City University, Yiyang 413000;2. College of Civil Engineering, Hunan University, Changsha 410082;3. Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Hunan University, Changsha 410082;Department of Auburn Construction, Hunan City University, Yiyang 413000;1. College of Civil Engineering, Hunan University, Changsha 410082;2. Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Hunan University, Changsha 410082;1. College of Civil Engineering, Hunan University, Changsha 410082;2. Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Hunan University, Changsha 410082;1. College of Civil Engineering, Hunan University, Changsha 410082;2. Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Hunan University, Changsha 410082 |
| 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. |
| Keywords: | composite photocatalysts(MWNTs/TiO2) chlorobenzenes photocatalytic degradation kinetic process |
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