In Situ Time-Resolved Energy-Dispersive XAFS Study on Photodeposition of Rh Particles on a TiO2 Photocatalyst
In Situ Time-Resolved Energy-Dispersive XAFS Study on Photodeposition of Rh Particles on a TiO2 Photocatalyst
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DOI：
10.1021/jp8010537
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发表时间：
2008-04
影响因子：
3.7
通讯作者：
K. Teramura;S. Okuoka;S. Yamazoe;Kazuo Kato;T. Shishido;Tsunehiro Tanaka
中科院分区：
文献类型：
--
作者：
K. Teramura;S. Okuoka;S. Yamazoe;Kazuo Kato;T. Shishido;Tsunehiro Tanaka
这是第一篇通过原位时间分辨能量色散X射线吸收精细结构（DXAFS）分析，从液固悬浮液中的Rh三价离子水溶液中观察光沉积的实时行为和固定在TiO2光催化剂上的Rh金属颗粒的连续结构变化的报告。 DXAFS分析发现，Rh三价离子吸附在TiO2光催化剂的表面上，然后通过接受电子还原成Rh金属颗粒，因为通过EXAFS光谱的傅立叶变换评估的Rh-Rh键的配位数和通过ICP分析确定的Rh三价离子的量随着光照射时间的延长而线性增加和减少， 分别。 Rh金属颗粒的生成速率和Rh三价离子的减少速率取决于牺牲试剂的类型，并且往往按照对应于甲醇>乙醇≫1-丙醇>2...的顺序变慢。
It is the first report to observe the real-time behavior of photodeposition and the continuous structural change of Rh metal particles anchored on a TiO2 photocatalyst from an aqueous solution of Rh trivalent ions in the liquid—solid suspension by an in situ time-resolved energy-dispersive X-ray absorption fine structure (DXAFS) analysis. The DXAFS analysis uncovered that the Rh trivalent ions are adsorbed on the surface of the TiO2 photocatalyst, followed by reducing to the Rh metal particles by acceptance of electrons because the coordination number of a Rh—Rh bond evaluated by the Fourier transforms of EXAFS spectra and the amount of the Rh trivalent ions determined by the ICP analysis linearly increased and decreased with elongation of photoirradiation time, respectively. The generation rates of the Rh metal particles and the diminution rates of the Rh trivalent ions depended on the type of sacrificial reagents and tends to become slower in the order corresponding to methanol > ethanol ≫ 1-propanol >2...