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Photooxidative N-demethylation of methylene blue in aqueous TiO2 dispersions under UV irradiation
Zhang, TY; Oyama, T; Aoshima, A; Hidaka, H; Zhao, JC; Serpone, N
2001-05-10
Source PublicationJOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
ISSN1010-6030
Volume140Issue:2Pages:163-172
AbstractMethylene blue (MB) is a representative of a class of dyestuffs resistant to biodegradation. Its decomposition was examined in aqueous TiO2 dispersions under W illumination to assess the influence of temperature, pH, concentration of dissolved oxygen (DOC), initial concentration of R IB, and light intensity on the kinetics of decomposition. Hypsochromic effects (i.e. blue shifts of spectral bands) resulting from N-demethylation of the dimethylamino group in MB occurs concomitantly with oxidative degradation. The maximum quantity of MB adsorbed on TiO2, and the kinetics of degradation of MB and of total organic carbon (TOC) removal were also measured at constant pH 4. Photobleaching of MB solutions takes place at low DOCs and is caused by a reversible reductive process involving photogenerated electrons on TiO2. The rate of degradation of MB remains fairly constant regardless of whether the dispersion was purged with oxygen prior to irradiation or with air during the light irradiation period, The photocatalytic process depends on light intensity, but not on the total light energy absorbed. The photoreaction followed pseudo-first-order kinetics even at high MB concentrations (0.3 mM). The temperature dependence of the photodegradation kinetics was assessed (E-a = 8.9 kJ/mol), as well as the relative photonic efficiency, xi (r), relative to phenol (0.48). (C) 2001 Elsevier Science B.V. All rights reserved.
KeywordMethylene Blue Photocatalytic Reaction Titanium Dioxide N-demethylation
Indexed BySCI
Language英语
WOS IDWOS:000168385200009
PublisherELSEVIER SCIENCE SA
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Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/76732
Collection中国科学院化学研究所
Corresponding AuthorHidaka, H
Affiliation1.Meisei Univ, Frontier Res Ctr Global Environm Protect, Hino, Tokyo 1918506, Japan
2.Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
3.Concordia Univ, Dept Chem & Biochem, Montreal, PQ H3G 1M8, Canada
4.Tianjin Univ, Coll Chem Engn & Technol, Dept Appl Chem, Tianjin 300072, Peoples R China
Recommended Citation
GB/T 7714
Zhang, TY,Oyama, T,Aoshima, A,et al. Photooxidative N-demethylation of methylene blue in aqueous TiO2 dispersions under UV irradiation[J]. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY,2001,140(2):163-172.
APA Zhang, TY,Oyama, T,Aoshima, A,Hidaka, H,Zhao, JC,&Serpone, N.(2001).Photooxidative N-demethylation of methylene blue in aqueous TiO2 dispersions under UV irradiation.JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY,140(2),163-172.
MLA Zhang, TY,et al."Photooxidative N-demethylation of methylene blue in aqueous TiO2 dispersions under UV irradiation".JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY 140.2(2001):163-172.
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