Photocatalytic decolorization of Remazol Black 5 and Remazol Brilliant Orange 3R?by mesoporous TiO₂

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• 作者：Chia-Yun Chen^a ; Meng-Cheng Cheng^b ; Arh-Hwang Chen^b ; ^{chenah@ms12.hinet.net}
• 关键词：Mesoporous TiO2 ; Azo dye ; Photocatalytic decolorization ; Kinetics ; Electron acceptor
• 刊名：Journal of Environmental Management
• 出版年：2012
• 出版时间：15 July, 2012
• 年：2012
• 卷：102
• 期：Complete
• 页码：125-133
• 全文大小：850 K

文摘

Mesoporous TiO₂ microparticles (TiO₂-11) were prepared through the micelle hydrothermal method using a 1:1?M ratio of 1-tetradecylamine:Ti(OiPr)₄. TiO₂-11 microparticles exhibited significantly higher decolorization percentage of Remazol Black 5 (RB5) and Remazol Brilliant Orange (3R) dyes than other TiO₂ microparticles formed with different molar ratios of 1-tetradecylamine:Ti(OiPr)₄, and P25 and anatase TiO_2. The results showed that the decolorization of the dyes by the microparticles was affected by the different irradiation wavelengths, catalyst dosages, dye concentrations, initial pH values, as well as electron acceptors. The kinetic experiments with varying initial pH values were in accordance with the second-order model. In addition, the adsorption study of the dyes in the dark fitted well with the Langmuir isotherm model. With the addition of 20?mmol/mL of three electron acceptors, H₂O₂, KBrO₃, and (NH₄)₂S₂O₈, the decolorization of the RB5 and 3R dyes increased by 54 % and 35 % , 59 % and 41 % , and 36 % and 33 % , respectively. Hence, this technique for the preparation of the mesoporous TiO₂ microparticles can facilitate more efficient decolorization of dyes in an aqueous solution.