ICCAS OpenIR
Highly selective deethylation of rhodamine B: Adsorption and photooxidation pathways of the dye on the TiO2/SiO2 composite photocatalyst
Chen, F; Zhao, JC; Hidaka, H
2003
Source PublicationINTERNATIONAL JOURNAL OF PHOTOENERGY
ISSN1110-662X
Volume5Issue:4Pages:209-217
AbstractThe photocatalytic degradation of Rhodamine B (RhB) with TiO2 and TiO2/SiO2 in the aqueous dispersion was investigated under both the visible light (lambda > 480 nm) and UV irradiation. The detailed photocatalytic oxidative process of RhB under these different conditions was revealed by measurement of the isoelectric points of the catalysts, UV-VIS spectra, HPLC and LC-MS. RhB adsorbs on the surface of TiO2/SiO2 particles by the positively-charged diethylamino group while, in the case of net TiO2, it adsorbs through the negatively-charged carboxyl group under the experimental conditions (pH similar to 4.3). In the RhB-TiO2/SiO2 system, RhB firstly underwent a highly selective stepwise deethylation process before the destruction of the chromophore structure under visible light irradiation. The average yield of the every deethylation step was higher than 86%. It is confirmed that visible light-induced photocatalytic degradation of dye proceeds on the surface of catalysts rather than in the bulk solution and active oxygen species preferentially attack the molecular portion that connects directly to the surface of catalysts. This work provides a possibility for the modification of the surface characteristics of TiO2 to adsorb effectively the special colored organic molecules in selective mode for selective modification or deeply extent photooxidation.
Indexed BySCI
Language英语
WOS IDWOS:000184280800002
PublisherPHOTOENERGY CENTER AIN SHAMS UNIV,
Citation statistics
Cited Times:149[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/80952
Collection中国科学院化学研究所
Corresponding AuthorHidaka, H
Affiliation1.Meisei Univ, Frontier Res Ctr Global Environm Protect, Tokyo 1918506, Japan
2.Chinese Acad Sci, Inst Chem, Lab Photochem, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Chen, F,Zhao, JC,Hidaka, H. Highly selective deethylation of rhodamine B: Adsorption and photooxidation pathways of the dye on the TiO2/SiO2 composite photocatalyst[J]. INTERNATIONAL JOURNAL OF PHOTOENERGY,2003,5(4):209-217.
APA Chen, F,Zhao, JC,&Hidaka, H.(2003).Highly selective deethylation of rhodamine B: Adsorption and photooxidation pathways of the dye on the TiO2/SiO2 composite photocatalyst.INTERNATIONAL JOURNAL OF PHOTOENERGY,5(4),209-217.
MLA Chen, F,et al."Highly selective deethylation of rhodamine B: Adsorption and photooxidation pathways of the dye on the TiO2/SiO2 composite photocatalyst".INTERNATIONAL JOURNAL OF PHOTOENERGY 5.4(2003):209-217.
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