Effect of copper ions on the formation of hydrogen peroxide from photocatalytic titanium dioxide particles
Effect of copper ions on the formation of hydrogen peroxide from photocatalytic titanium dioxide particles
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DOI：
10.1016/s0021-9517(03)00197-0
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发表时间：
2003-10-01
影响因子：
7.3
通讯作者：
Fujishima, A
中科院分区：
文献类型：
--
作者：
Cai, RX;Kubota, Y;Fujishima, A
反应性自由基如羟基自由基（OH.），过氧化氢（H2 O2）和超氧阴离子（O-2（-））是驱动二氧化钛（TiO 2）光催化反应（例如生物细胞的光杀伤）的主要动力。在这里，铜离子的光催化TiO 2上的H2 O2的形成的影响进行了研究。在氧气吹扫的溶液中，通过加入少量的铜离子，H2 O2的形成急剧增加至20倍。通过使用芬顿反应，可以将形成的H2 O2转化为OH。一种高度反应性的自由基。相反，在氮气吹扫的溶液中，即使在电子受体银离子（Ag+）的存在下，也没有H2 O2形成。这些结果清楚地表明，H2 O2从光激发的TiO 2的还原位点产生，并指示提高光催化效率的有效途径。(C)2003年爱思唯尔公司All rights reserved.
Reactive radicals such as hydroxyl radical (OH.), hydrogen peroxide (H2O2), and superoxide anion (O-2(-)) are the main power driving titanium dioxide (TiO2) photocatalytic reactions, for example, photokilling of biological cells. Here, the effect of copper ions on the formation of H2O2 over photocatalytic TiO2 was investigated. Under an oxygen-purged solution, formation of H2O2 was increased dramatically up to 20 times by the addition of a small amount of copper ions. By using the Fenton reaction, the H2O2 formed can be converted into OH. a highly reactive radical. In contrast, under nitrogen-purged solution, no H2O2 was formed even in the presence of an electron acceptor, silver ion (Ag+). These results clearly show that H2O2 was generated from the reduction site of the photoexcited TiO2 and indicate an effective way to increase the photocatalytic efficiency. (C) 2003 Elsevier Inc. All rights reserved.