Photocatalytic remote oxidation with various photocatalysts and enhancement of its activity
Photocatalytic remote oxidation with various photocatalysts and enhancement of its activity
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DOI：
10.1039/b504752h
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发表时间：
2005-07
影响因子：
--
通讯作者：
W. Kubo;T. Tatsuma
中科院分区：
文献类型：
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作者：
W. Kubo;T. Tatsuma
研究了不同类型光催化剂，包括TiO_2、缺氧TiO_2、板钛矿TiO_2、ZnO、WO_3、负载金属（Au、Pt、Ag和Pd）的TiO_2和负载金属（Au、Pt和Ag）的ZnO的光催化远程氧化性能。这些光催化剂均表现出远距离氧化活性。其中，Pt负载的TiO 2表现出最高的活性;使十八烷基三乙氧基硅烷改性的玻璃表面超亲水化需要2分钟，而裸露的纳米TiO 2需要24分钟。由于不含有机化合物制备的TiO 2膜的远程氧化活性与含有有机杂质的普通TiO 2膜的远程氧化活性几乎相同，远程氧化所必需的活性物质不是由有机杂质光催化产生的，而是由环境物质如O2和H2O产生的。TiO_2和Pt-TiO_2的光催化远程氧化可应用于聚偏氟乙烯等材料，但对聚四氟乙烯的光催化远程氧化效果不佳。芬顿和H2 O2-UV反应中观察到相同的趋势，其中产生羟基自由基，这表明与羟基自由基一样强的氧化物种参与远程氧化。
Photocatalytic remote oxidation with various photocatalysts, anatase TiO2, oxygen deficient TiO2, brookite TiO2, ZnO, WO3, metal (Au, Pt, Ag and Pd)-loaded anatase TiO2 and metal (Au, Pt and Ag)-loaded ZnO, were investigated. All these photocatalysts exhibited activities for remote oxidation. Among them, Pt-loaded TiO2 exhibited the highest activity; it took 2 min to make the octadecyltriethoxysilane-modified glass surfaces super-hydrophilic, while bare anatase TiO2 took 24 min. Since the remote oxidation activity of a TiO2 film that was prepared without organic compounds was almost the same as that of a normal TiO2 film, which contains organic impurities, the active species essential to the remote oxidation is not generated photocatalytically from the organic impurities but from ambient species such as O2 and H2O. The photocatalytic remote oxidation by TiO2 and Pt–TiO2 could be applied to poly(vinylidenefluoride) and many other materials but not to Teflon. The same trend was observed for Fenton and H2O2-UV reactions, in which hydroxyl radical is generated, suggesting that an oxidizing species as strong as a hydroxyl radical is involved in the remote oxidation.