Photosensitized degradation of dyes in polyoxometalate solutions versus TiO2 dispersions under visible-light irradiation: Mechanistic implications
文献类型：期刊论文
| 作者 | Chen, CC; Zhao, W; Lei, PX; Zhao, JC; Serponer, N |
| 刊名 | CHEMISTRY-A EUROPEAN JOURNAL
 |
| 出版日期 | 2004-04-19 |
| 卷号 | 10期号:8页码:1956-1965 |
| 关键词 | Photodegradation Polyoxometalates Reaction Mechanisms Titanium Oxide Visible-light Irradiation |
| ISSN号 | 0947-6539 |
| DOI | 10.1002/chem.200305453 |
| 英文摘要 | This article examines the photoxidation of a dye (rhodamine-B, RhB) by visible-light irradiation in the presence of a polyoxometalate (12-tungstosilicic acid, H4SiW12O40), and compares it with the analogous process in the presence of TiO2. The photoreaction processes were examined by UV-visible spectroscopy, fluorescence spectroscopy, high-performance liquid chromatography (HPLC), liquid chromatography/mass spectral techniques (LC-MS), and total organic carbon (TOC) assays in order to identify the intermediates produced. Formation of oxygen species, such as H2O2 and O-2(.-), was also investigated to clarify the details of the reaction pathway. With the Use Of SiW12O404- ions as the photocatalyst, the photoreaction leads mainly to N-dealkylation of the chromophore skeleton. In contrast, cleavage of the whole conjugated chromophore structure predominates in the presence of TiO2. Strong O-2(.-)/HO2.- ESR signals were detected in the TiO2 dispersions, whereas only weak ESR signals for the O-2(.-) radical ion were seen in the SiW12O404- solutions during the irradiation period. Experimental results imply that reduction of O-2 occurs by different pathways in the two photocatalytic systems. |
| 语种 | 英语 |
| WOS记录号 | WOS:000221025200011 |
| 出版者 | WILEY-V C H VERLAG GMBH |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/55367]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Zhao, JC |
| 作者单位 | 1.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Lab Photochem, Beijing 100080, Peoples R China 2.Concordia Univ, Dept Chem & Biochem, Montreal, PQ H3G 1M8, Canada |
| 推荐引用方式 GB/T 7714 | Chen, CC,Zhao, W,Lei, PX,et al. Photosensitized degradation of dyes in polyoxometalate solutions versus TiO2 dispersions under visible-light irradiation: Mechanistic implications[J]. CHEMISTRY-A EUROPEAN JOURNAL,2004,10(8):1956-1965. |
| APA | Chen, CC,Zhao, W,Lei, PX,Zhao, JC,&Serponer, N.(2004).Photosensitized degradation of dyes in polyoxometalate solutions versus TiO2 dispersions under visible-light irradiation: Mechanistic implications.CHEMISTRY-A EUROPEAN JOURNAL,10(8),1956-1965. |
| MLA | Chen, CC,et al."Photosensitized degradation of dyes in polyoxometalate solutions versus TiO2 dispersions under visible-light irradiation: Mechanistic implications".CHEMISTRY-A EUROPEAN JOURNAL 10.8(2004):1956-1965. |
入库方式： OAI收割
来源：化学研究所
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