Effects of hydroxyl radicals and oxygen species on the 4-chlorophenol degradation by photoelectrocatalytic reactions with TiO2-film electrodes
文献类型：期刊论文
| 作者 | Yang, Juan1; Dai, Jun1; Chen, Chuncheng2; Zhao, Jincai2 |
| 刊名 | JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
 |
| 出版日期 | 2009-11-15 |
| 卷号 | 208期号:1页码:66-77 |
| 关键词 | Tio2-film Electrode Oxygen Species H2o18 Mineralization 4-cp |
| ISSN号 | 1010-6030 |
| DOI | 10.1016/j.jphotochem.2009.08.007 |
| 英文摘要 | The supported nano-TiO2 electrode was prepared by sol-gel and hydrothermal method, and the photoelectrocatalytic degradation of 4-chlorophenol (4-CP) under UV irradiation has been investigated to reveal the roles of hydroxyl radicals and dissolved oxygen species for TiO2-assisted photocatalytic reactions. The degradation kinetics, the formation and decay of intermediates, the isotopic tracer experiments with H2O18, the removal yield of total organic carbon and the formation of active radical species in the presence of oxygen or not were examined by HPLC, GC-MS, TOC and spin-trap ESR spectrometry. It was found that most of (OH)-O-center dot radicals in the primary hydroxylated intermediates derived from the oxidation of adsorbed H2O or HO- by photo-holes in the electrochemically assisted TiO2 photocatalytic system. It also indicates that the enhancement in the separation efficiency of photogenerated charges by applying a positive bias (+0.5V vs SCE) has little role in the following decomposition and mineralization of these hydroxylated intermediates in the absence of oxygen. According to above experimental results, the pathway of 4-CP photocatalytic degradation was deduced initially. Due to the combined effect of (OH)-O-center dot radicals and dissolved oxygen species, the hydroxylated 4-chlorphenol, via cis, cis-3-chloromuconic acid, was decomposed into low molecular weight acid and CO2. (C) 2009 Elsevier B.V. All rights reserved. |
| 语种 | 英语 |
| WOS记录号 | WOS:000271595300010 |
| 出版者 | ELSEVIER SCIENCE SA |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/65781]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Yang, Juan |
| 作者单位 | 1.Henan Polytech Univ, Dept Phys Chem, Jiaozuo 454003, Henan, Peoples R China 2.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Juan,Dai, Jun,Chen, Chuncheng,et al. Effects of hydroxyl radicals and oxygen species on the 4-chlorophenol degradation by photoelectrocatalytic reactions with TiO2-film electrodes[J]. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY,2009,208(1):66-77. |
| APA | Yang, Juan,Dai, Jun,Chen, Chuncheng,&Zhao, Jincai.(2009).Effects of hydroxyl radicals and oxygen species on the 4-chlorophenol degradation by photoelectrocatalytic reactions with TiO2-film electrodes.JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY,208(1),66-77. |
| MLA | Yang, Juan,et al."Effects of hydroxyl radicals and oxygen species on the 4-chlorophenol degradation by photoelectrocatalytic reactions with TiO2-film electrodes".JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY 208.1(2009):66-77. |
入库方式： OAI收割
来源：化学研究所
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