Photooxidation of the phenylazonaphthol AO20 on TIO2:: kinetic and mechanistic investigations
Photooxidation of the phenylazonaphthol AO20 on TIO2:: kinetic and mechanistic investigations
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DOI：
10.1016/s0045-6535(01)00118-7
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发表时间：
2001-11-01
期刊：
影响因子：
8.8
通讯作者：
Kalt, A
中科院分区：
文献类型：
--
作者：
Galindo, C;Jacques, P;Kalt, A
研究了悬浮态二氧化钛对单偶氮染料AO 20的光催化和光敏降解。动力学和机理的细节已阐明使用UV/维斯，FTIR和TCO技术。已经证明，染料分子吸附到载体材料上对于该方法有效是必不可少的。此外，即使它们的机制在早期阶段有所不同，但光降解和光敏化导致非常相似的最终分解产物。实际上，锚定到氧化物表面的原始染料系统地经历快速分解，直到其转化为CO2或脂肪酸（甲酸、乙酸、草酸），其与羟基自由基或捕获的空穴反应相当缓慢。(C)2001爱思唯尔科技有限公司版权所有。
The results of the photocatalytic and photosensitized degradations of the monoazo dye AO20 in aqueous solution using suspended titanium dioxide are presented. Kinetic and mechanistic details have been elucidated using UV/Vis, FTIR and TCO techniques. It was proven that adsorption of dye molecules onto the support material is essential for the processes to be effective. Moreover, even if their mechanisms differ during the early stages, photocatalysis and photosensitization lead to very similar ultimate breakdown products. Indeed, the original dye anchored to the oxide surface systematically undergoes fast decomposition until it is transformed into CO2 or aliphatic acids (formic, acetic, oxalic acids), which react rather slowly with hydroxyl radicals or trapped holes. (C) 2001 Elsevier Science Ltd. All rights reserved.