標題: Evaluating the sensitizing effect on the photocatalytic decoloration of dyes using anatase-TiO2
作者: Hsiao, Yu-Cheng
Wu, Tsai-Fang
Wang, Yu-Sheng
Hu, Chi-Chang
Huang, Chihpin
環境工程研究所
Institute of Environmental Engineering
關鍵字: Photocatalysis;Dye-sensitizing effect;Titanium dioxide;Dye decoloration;Photocurrent-voltage curve
公開日期: 27-Apr-2014
摘要: This work tries to clarify the contribution of the dye-sensitizing effect on the photocatalytic decoloration of dyes dissolved in aqueous media using an anatase TiO2 (A-TiO2) photocatalyst. The photocurrentvoltage (J-V) curves of a typical dye-sensitized solar cell (DSSC) with the A-TiO2 photoanodes adsorbed with various dyes, including methylene blue (MB), orange G (OG), rhodamine B (RhB), metanil yellow (MY), acid black 24 (AB24), and N719, are employed to demonstrate the sensitizing characteristics of dyes on A-TiO2. Unlike RhB, the MB, OG, MY, and AB24 cannot work as the photo-sensitizer on A-TiO2 from the J-V curves of DSSCs, reasonably due to the unmatched band position between dyes and A-TiO2. In the photocatalytic decoloration test of these dyes on A-TiO2 in aqueous media, dye adsorption onto A-TiO2 becomes the key factors affecting the photocatalytic decoloration rate because the generation of oxidants species (e.g., Oi(2)(-center dot), OH center dot or photo-excited holes) occurs on the A-TiO2 surface. The contribution of dye-sensitizing on the photocatalytic decoloration of RhB is negligible since the dye-sensitizing/electron-injection/dye-regeneration cycle cannot be completed in the degradation media while adsorbed RhB molecules are unstable when few photo-generated electrons have been injected into the conduction band of A-TiO2, probably leading to the decomposition of RhB. (C) 2013 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.apcatb.2013.11.014
http://hdl.handle.net/11536/23941
ISSN: 0926-3373
DOI: 10.1016/j.apcatb.2013.11.014
期刊: APPLIED CATALYSIS B-ENVIRONMENTAL
Volume: 148
Issue: 
起始頁: 250
結束頁: 257
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