State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, No. 122, Luoshi Road, Wuhan 430070, PR China.
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, No. 122, Luoshi Road, Wuhan 430070, PR China.
J Colloid Interface Sci. 2019 Jan 15;534:389-398. doi: 10.1016/j.jcis.2018.09.049. Epub 2018 Sep 15.
Usually, a ZnO nanorods array exhibits a relatively small effective surface area due to its smooth surface and large area density (the number of ZnO nanorods per unit area). In this work, a mesoporous ZnO nanorods array with a small area density and a large effective surface area was successfully synthesized on the surface of fluorine-doped tin dioxide (FTO) glass using a facile solution process, with ethylene glycol (EG) and water serving as the mixed solvent and cadmium ions serving as an additives. The area density, aspect ratio and specific surface area of mesoporous ZnO nanorods array can be controlled by adjusting the concentration of cadmium ions in the EG-HO mixed solution. The obtained ZnO nanorods array was applied as the photocatalyst for the photodegradation of methylene blue (MB) and showed a good catalytic performance that was dependent on the area density, rather than the specific surface area. This may be because a smaller area density of nanorods array can facilitate the diffusion of MB molecules and thus provide a larger effective surface area for MB adsorption, despite a large difference in their specific surface area. Therefore, this work can provide a guidance for synthesizing nanostructures with good photocatalytic activity on the devices.
通常情况下，由于 ZnO 纳米棒阵列具有光滑的表面和较大的面积密度（单位面积上的 ZnO 纳米棒数量），其有效表面积相对较小。在这项工作中，我们采用简便的溶液法，以氟掺杂氧化锡（FTO）玻璃为基底，以乙二醇（EG）和水的混合溶液为溶剂，以镉离子为添加剂，成功制备了具有小面积密度和大有效表面积的介孔 ZnO 纳米棒阵列。通过调节 EG-HO 混合溶液中镉离子的浓度，可以控制介孔 ZnO 纳米棒阵列的面积密度、纵横比和比表面积。所得 ZnO 纳米棒阵列被用作光催化剂，用于亚甲基蓝（MB）的光降解，其光催化性能取决于面积密度，而不是比表面积。这可能是因为较小的纳米棒阵列面积密度有利于 MB 分子的扩散，从而为 MB 吸附提供了更大的有效表面积，尽管它们的比表面积有很大差异。因此，这项工作可以为在器件上合成具有良好光催化活性的纳米结构提供指导。
