Post-irradiation effect and reductive dechlorination of chlorophenols at oxygen-free TiO2/water interfaces in the presence of prominent hole scavengers
文献类型：期刊论文
| 作者 | Serpone, N; Texier, I; Emeline, AV; Pichat, P; Hidaka, H; Zhao, J |
| 刊名 | JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
 |
| 出版日期 | 2000-09-29 |
| 卷号 | 136期号:3页码:145-155 |
| 关键词 | Pentachlorophenol Tio2 Particles Photolysis 2 4-dichlorophenol |
| ISSN号 | 1010-6030 |
| 英文摘要 | Heterogeneous photocatalysis with TiO2 nanoparticles for the detoxification of waste-waters and other media is typically achieved by oxidative pathways involving ultimately photogenerated surface-trapped holes (i.e, surface-bound (OH)-O-. radicals). However, reductive pathways may coexist. The degradation of 2,4-dichlorophenol (2,4-DCP) and pentachlorophenol (PCP) was examined in irradiated O-2-free aqueous media in the presence of prominent hole scavengers such as polyethyleneimine (PEI), triethylamine (TEA), 2-propanol (IPA) and ethylenediaminetetraacetic acid (in the EDTA(4-) state) to assess the role of photogenerated electrons. The presence of these scavengers imparts a blue-violet color to the nanoparticles corresponding to a broad absorption band in the 400-850 nm region. A post-irradiation effect was observed when irradiation was terminated, which we ascribe to an electron transfer from radical species formed by hole scavenging to the TiO2 particles (reminiscent of the doubling current phenomena in semiconductor electrodes). The two chlorophenols degraded in oxygen-free media, a process inhibited by PEI, TEA and IPA. In the presence of EDTA, degradation of 2,4-dichorophenol occurred by dechlorination only after a 120-min induction period, a process attributed to the accumulated electrons on the particle surface. HPLC analyses revealed that the intermediate products were not those expected from typical oxidative pathways in aerated aqueous media. The degradative process is inferred to take place first by electron attachment to the halophenol to yield phenoxy related radicals and then by secondary reactions with water and/or with each other. (C) 2000 Elsevier Science S.A. All rights reserved. |
| 语种 | 英语 |
| WOS记录号 | WOS:000089676300001 |
| 出版者 | ELSEVIER SCIENCE SA |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/76261]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Serpone, N |
| 作者单位 | 1.Concordia Univ, Dept Chem & Biochem, Montreal, PQ H3G 1M8, Canada 2.Ecole Cent Lyon, IFOS, Lab Photocatalyse Catalyse & Environm, CNRS,UMR, F-69131 Ecully, France 3.St Petersburg State Univ, Dept Gen Phys 2, St Petersburg 198904, Russia 4.Meisei Univ, Dept Chem, Ctr Global Environm Protect, Hino, Tokyo 1918506, Japan 5.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Lab Photochem, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Serpone, N,Texier, I,Emeline, AV,et al. Post-irradiation effect and reductive dechlorination of chlorophenols at oxygen-free TiO2/water interfaces in the presence of prominent hole scavengers[J]. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY,2000,136(3):145-155. |
| APA | Serpone, N,Texier, I,Emeline, AV,Pichat, P,Hidaka, H,&Zhao, J.(2000).Post-irradiation effect and reductive dechlorination of chlorophenols at oxygen-free TiO2/water interfaces in the presence of prominent hole scavengers.JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY,136(3),145-155. |
| MLA | Serpone, N,et al."Post-irradiation effect and reductive dechlorination of chlorophenols at oxygen-free TiO2/water interfaces in the presence of prominent hole scavengers".JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY 136.3(2000):145-155. |
入库方式： OAI收割
来源：化学研究所
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