Influences of Porous Structurization and Pt Addition on the Improvement of Photocatalytic Performance of WO3 Particles
Influences of Porous Structurization and Pt Addition on the Improvement of Photocatalytic Performance of WO3 Particles
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DOI：
10.1021/am507935j
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发表时间：
2015-02-11
影响因子：
9.5
通讯作者：
Okuyama, Kikuo
中科院分区：
文献类型：
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作者：
Arutanti, Osi;Nandiyanto, Asep Bayu Dani;Okuyama, Kikuo
三氧化钨（WO₃）在太阳能相关材料应用中表现出优异的性能。然而，这种材料稀有且昂贵。因此，使用较少量的WO₃开发高效材料是不可避免的。在这项研究中，我们研究了如何制备含有铂（Pt，作为助催化剂）且具有均匀球形大孔（作为使大分子能够进入以及光线穿透到催化剂内部偏远区域的介质）的WO₃颗粒，使其具有高光催化性能。目前的颗粒是通过对含有WO₃纳米颗粒、Pt溶液和聚苯乙烯（PS）球（作为胶体模板）的前驱体溶液进行喷雾干燥制备的。光催化研究表明，颗粒形态的变化（从表面光滑的致密结构，到表面粗糙的致密结构，再到多孔结构）以及添加Pt有效地提高了相对于WO₃纳米颗粒的光催化性能。我们的结果表明，最佳的前驱体（使用PS/WO₃质量比为0.32且含有Pt助催化剂制备）所提供的WO₃颗粒的光催化速率是纯10nm WO₃纳米颗粒的5倍以上。此外，该催化剂可以有效地回收利用，其光催化活性没有明显下降。光催化反应现象的提出机制也支持了实验结果。
Tungsten trioxide (WO3) displays excellent performance in solar-related material applications. However, this material is rare and expensive. Therefore, developing efficient materials using smaller amounts of WO3 is inevitable. In this study, we investigated how to create high photocatalytic performance of WO3 particles containing platinum (Pt, as a co-catalyst) and homogeneously spherical macropores (as a medium to enable access of large molecules and light penetration into the remote internal regions of the catalyst). The present particles were prepared by spray drying of a precursor solution containing WO3 nanoparticles, Pt solution, and polystyrene (PS) spheres (as a colloidal template). Photocatalytic studies showed that changes in particle morphology (from dense with smooth surfaces, to dense with rough surfaces, to porous structures) and added Pt effectively improved the photocatalytic performance over WO3 nanoparticles. Our results showed that the best precursor (prepared using a PS/WO3 mass ratio of 0.32 and containing Pt co-catalyst) provided WO3 particles with a photocatalytic rate of more than 5 times that of pure 10 nm WO3 nanoparticles. Moreover, the catalyst can be effectively recycled without an apparent decrease in its photocatalytic activity. The experimental results were also supported by a proposal mechanism of the photocatalytic reaction phenomenon.