Mechanism of photodecomposition of H2O2 on TiO2 surfaces under visible light irradiation
Mechanism of photodecomposition of H2O2 on TiO2 surfaces under visible light irradiation
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DOI：
10.1021/la010035s
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发表时间：
2001-06-26
期刊：
影响因子：
3.9
通讯作者：
Zhao, JC
中科院分区：
文献类型：
--
作者：
Li, XZ;Chen, CC;Zhao, JC
研究了可见光照射（λ> 420 nm）下过氧化氢在TiO 2表面的光分解，发现一个有趣的结果，在可见光照射下，在TiO 2和H2 O2的存在下，水杨酸等小有机化合物会被降解，尽管单独的TiO 2或H2 O2不能吸收可见光来分解H2 O2或小有机化合物。研究了H2 O2浓度、pH值、光照波长等因素对H2 O2降解的影响。H_2O_2的光降解反应遵循零级动力学过程，（OH）-O-.自由基检测可见光照射的水性TiO 2悬浮液中的电子顺磁共振实验。H2 O2在TiO 2表面上的分解反应机理涉及Ti-IV-OOH表面络合物的光诱导电子转移。
Photodecomposition of hydrogen peroxide on TiO2 surfaces under visible irradiation (lambda > 420 nm) was investigated, and an interesting result was found that small organic compounds such as salicylic acid were degraded in the presence of TiO2 and H2O2 under visible irradiation, although either TiO2 or H2O2 alone cannot absorb visible light to decompose H2O2 or small organic compounds. Furthermore, the effects of H2O2 concentration, pH, and the wavelength of irradiation light on the degradation of H2O2 were studied. The photodegradation of H2O2 occurred via a zero-order process, and (OH)-O-. radicals were detected by electron paramagnetic resonance experiments in visible-light-irradiated aqueous TiO2 suspensions. A reaction mechanism for the decomposition of H2O2 on the TiO2 surfaces is proposed involving a photoinduced electron transfer of the surface complexes of =Ti-IV-OOH.