Lowering of photocatalytic activity of TiO2 particles during oxidative decomposition of benzene in aerated liquid
Lowering of photocatalytic activity of TiO2 particles during oxidative decomposition of benzene in aerated liquid
复制标题
曝气液体中苯氧化分解过程中TiO2颗粒光催化活性的降低
DOI：
10.1016/j.apcatb.2009.11.008
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发表时间：
2010
影响因子：
22.1
通讯作者：
M. Matsumura
中科院分区：
文献类型：
--
作者：
T. D. Bui;A. Kimura;S. Ikeda;M. Matsumura
在纯苯中悬浮tio2颗粒，进行tio2光催化反应。苯和大多数有机化合物一样，被氧化分解成二氧化碳。然而，随着反应的继续，苯释放二氧化碳的速率逐渐降低，这与其他非芳香族有机化合物（如醇或酸）的情况相反。为了弄清TiO2活性下降的原因，我们用化学和物理方法分析了TiO2溶液中和表面产生的中间体。鉴定出了几种中间体：酚类化合物、醛类、羧酸类和高分子物质。在这些产物中，儿茶酚和聚合物物质是导致TiO2光催化活性降低的主要原因，而这些物质只在TiO2粉末表面被观察到。
TiO2-photocatalyzed reaction was conducted in pure benzene in which TiO2particles were suspended. Benzene was oxidatively decomposed into CO2, as most of organic compounds. However, the rate of CO2evolution from benzene was gradually lowered as the reaction continued, which was in contrast to the cases of other non-aromatic organic compounds, such as alcohols or acids. To clarify the reason for the decrease in activity of TiO2, intermediates produced in the solution phase and on the surface of TiO2were analyzed using chemical and physical techniques. Several kinds of intermediates were identified: phenolic compounds, aldehydes, carboxylic acids, and polymeric substance. Of these products, catechol and polymeric substance, which were observed only on the surface of TiO2powder, were found to be responsible for the lowering of the photocatalytic activity of TiO2.
影响因子：
5.5
作者：
Ohno, T;Tokieda, K;Matsumura, M
通讯作者：
Matsumura, M