ICCAS OpenIR
Effect of transition metal ions on the TiO2-assisted photodegradation of dyes under visible irradiation: A probe for the interfacial electron transfer process and reaction mechanism
Chen, CC; Li, XZ; Ma, WH; Zhao, JC; Hidaka, H; Serpone, N
2002-01-17
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY B
ISSN1520-6106
Volume106Issue:2Pages:318-324
AbstractThe effect of metal ions (Cu2+, Fe3+, Zn2+, Al3+, and Cd2+) on the photodegradation of several dyes: sulforhodamine B (SRB), alizarin red (AR), and malachite green (MG) has been investigated in aqueous TiO2 dispersions under visible irradiation (lambda > 420 nm). Trace quantities of transition metal ions such as Cu2+ and Fe3+ having suitable redox potentials alter the electron-transfer pathway involving the dye, O-2 and TiO2 particles, and markedly depress the photodegradation of all three dyes under visible irradiation. Other metal ions, such as Zn2+, Cd2+, and Al3+, have only a slight influence on the photoreaction by altering the adsorption of dyes. Photogeneration of H2O2 and reactive radicals, and the changes in fluorescence emission of SRB in TiO2 aqueous dispersions were examined to elucidate the role of the metal ions. Addition of Cu2+ or Fe3+ decreases the reduction Of O-2 by the conduction electrons, subsequently blocks the formation of reactive oxygen species (O-.,(OH)-O-.), and depresses the degradation of dyes under visible irradiation. We deduce that the reduction Of O-2 is essential for the photodegradation of dyes under visible irradiation.
DOI10.1021/jp0119025
Indexed BySCI
Language英语
WOS IDWOS:000173357100014
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:306[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/79364
Collection中国科学院化学研究所
Corresponding AuthorZhao, JC
Affiliation1.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Lab Photochem, Beijing 100080, Peoples R China
2.Iwaki Meisei Univ, Frontier Res Ctr Global Environm Protect, Hino, Tokyo 191, Japan
3.Concordia Univ, Dept Chem & Biochem, Montreal, PQ H3G 1M8, Canada
Recommended Citation
GB/T 7714
Chen, CC,Li, XZ,Ma, WH,et al. Effect of transition metal ions on the TiO2-assisted photodegradation of dyes under visible irradiation: A probe for the interfacial electron transfer process and reaction mechanism[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2002,106(2):318-324.
APA Chen, CC,Li, XZ,Ma, WH,Zhao, JC,Hidaka, H,&Serpone, N.(2002).Effect of transition metal ions on the TiO2-assisted photodegradation of dyes under visible irradiation: A probe for the interfacial electron transfer process and reaction mechanism.JOURNAL OF PHYSICAL CHEMISTRY B,106(2),318-324.
MLA Chen, CC,et al."Effect of transition metal ions on the TiO2-assisted photodegradation of dyes under visible irradiation: A probe for the interfacial electron transfer process and reaction mechanism".JOURNAL OF PHYSICAL CHEMISTRY B 106.2(2002):318-324.
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