ICCAS OpenIR
Post-irradiation effect and reductive dechlorination of chlorophenols at oxygen-free TiO2/water interfaces in the presence of prominent hole scavengers
Serpone, N; Texier, I; Emeline, AV; Pichat, P; Hidaka, H; Zhao, J
2000-09-29
Source PublicationJOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
ISSN1010-6030
Volume136Issue:3Pages:145-155
AbstractHeterogeneous 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.
KeywordPentachlorophenol Tio2 Particles Photolysis 2 4-dichlorophenol
Indexed BySCI
Language英语
WOS IDWOS:000089676300001
PublisherELSEVIER SCIENCE SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/76262
Collection中国科学院化学研究所
Corresponding AuthorSerpone, N
Affiliation1.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
Recommended Citation
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.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Serpone, N]'s Articles
[Texier, I]'s Articles
[Emeline, AV]'s Articles
Baidu academic
Similar articles in Baidu academic
[Serpone, N]'s Articles
[Texier, I]'s Articles
[Emeline, AV]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Serpone, N]'s Articles
[Texier, I]'s Articles
[Emeline, AV]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.