形状定制的WO₃微/纳米晶体的合成及WO₃/TiO₂复合材料的光催化活性
Synthesis of Shape-Tailored WO₃ Micro-/Nanocrystals and the Photocatalytic Activity of WO₃/TiO₂ Composites.
作者信息
Székely István, Kovács Gábor, Baia Lucian, Danciu Virginia, Pap Zsolt
机构信息
Faculty of Chemistry and Chemical Engineering, Babeș-Bolyai University, Arany János 11, Cluj-Napoca RO-400028, Romania.
Faculty of Physics, Babeș-Bolyai University, M. Kogălniceanu 1, Cluj-Napoca RO-400084, Romania.
出版信息
Materials (Basel). 2016 Mar 31;9(4):258. doi: 10.3390/ma9040258.
A traditional semiconductor (WO₃) was synthesized from different precursors via hydrothermal crystallization targeting the achievement of three different crystal shapes (nanoplates, nanorods and nanostars). The obtained WO₃ microcrystals were analyzed by the means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and diffuse reflectance spectroscopy (DRS). These methods contributed to the detailed analysis of the crystal morphology and structural features. The synthesized bare WO₃ photocatalysts were totally inactive, while the P25/WO₃ composites were efficient under UV light radiation. Furthermore, the maximum achieved activity was even higher than the bare P25's photocatalytic performance. A correlation was established between the shape of the WO₃ crystallites and the observed photocatalytic activity registered during the degradation of different substrates by using P25/WO₃ composites.
通过水热结晶法，以三种不同的晶体形状（纳米片、纳米棒和纳米星）为目标，从不同前驱体合成了一种传统半导体（WO₃）。通过X射线衍射（XRD）、扫描电子显微镜（SEM）和漫反射光谱（DRS）对所得WO₃微晶进行了分析。这些方法有助于对晶体形态和结构特征进行详细分析。合成的裸WO₃光催化剂完全没有活性，而P25/WO₃复合材料在紫外光辐射下具有高效性。此外，所达到的最大活性甚至高于裸P25的光催化性能。通过使用P25/WO₃复合材料，在不同底物降解过程中观察到的光催化活性与WO₃微晶的形状之间建立了相关性。
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