Detection of active oxidative species in TiO2 photocatalysis using the fluorescence technique
Detection of active oxidative species in TiO2 photocatalysis using the fluorescence technique
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DOI：
10.1016/s1388-2481(00)00006-0
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发表时间：
2000-03-01
影响因子：
5.4
通讯作者：
Hashimoto, K
中科院分区：
文献类型：
--
作者：
Ishibashi, K;Fujishima, A;Hashimoto, K
活性氧化物种(主要对应于羟基自由基)。通过测量香豆素或对苯二甲酸与二氧化钛薄膜光催化剂反应产生的荧光，定量研究了二氧化钛薄膜光催化剂在充气水溶液中的光催化活性。在紫外光照射下，水溶液中的香豆素和氢氧化钠溶液中的对苯二甲酸在二氧化钛薄膜光催化剂上转化为高荧光羟基产物。对生成的羟基化合物的分析提供了对生成的活性氧化物种的灵敏和特定的监测。活性物种的形成速度可以由生成的羟基产物浓度增加的时间依赖性来确定。利用这种荧光方法，考察了光强对活性氧化物种生成效率的影响。结果表明，在50mW·cm~(-2)~15 mW·cm~(-2)的紫外光强范围内，活性氧化物种的生成效率是恒定的，这与文献[1]的结果一致。最近报道了通过使用其他技术进行OH检测。(C)2000 Elsevier Science S.A.保留所有权利。
The active oxidative species (mainly corresponding to hydroxyl radicals ( . OH)) produced on TiO2 film photocatalyst in aerated aqueous solution have been quantitatively investigated by measuring the fluorescence derived by the reaction with either coumarin or terephthalic acid. Upon UV light illumination, coumarin in aqueous solution and terephthalic acid in NaOH solution were converted on the TiO2 film photocatalyst to highly fluorescent hydroxy products. Analysis of the resultant hydroxy compounds provides sensitive and specific monitoring of the generated active oxidative species. The rate of active species formation could be determined by the time dependence of the increase in concentration of the resultant hydroxy products. Using this fluorescence method, the effect of light intensity on the generation efficiency of active oxidative species was examined. The obtained results show that the efficiency of active oxidative species formation is constant at the UV intensity from 50 mu W cm (-2) to 15 mW cm (-2), which is consistent with the results for . OH detection reported recently by the use of other techniques. (C) 2000 Elsevier Science S.A. All rights reserved.