Song Bo, Wang Tingting, Sun Honggang, Shao Qian, Zhao Junkai, Song Kaikai, Hao Luhan, Wang Li, Guo Zhanhu
Marine College, Shandong University, Weihai, 264209, Peoples R China.
Dalton Trans. 2017 Nov 21;46(45):15769-15777. doi: 10.1039/c7dt03003g.
In this study, carbon nanodots (C-dots)/WO photocatalysts were prepared via a two-step hydrothermal method. The morphologies and optical properties of the as-prepared materials were investigated. Compared with the prepared WO and C-dots, the C-dots/WO possessed stronger photocatalytic capability and excellent recyclability for photocatalytic elimination of Rhodamine B. For example, the achieved first order reaction rate constant of 0.01942 min for C-dots/WO was ∼7.7 times higher than that of the prepared WO. The enhanced photocatalytic activity of C-dots/WO was attributed to the enhanced light harvesting ability and efficient spatial separation of photo-excited electron-hole pairs resulting from the synergistic effect of WO and C-dots. The high photocatalytic activity of C-dots/WO remained unchanged even after 3 cycles of use. Meanwhile, a possible mechanism of C-dots/WO for the enhanced photocatalytic activity was proposed.
在本研究中，通过两步水热法制备了碳纳米点（C点）/WO光催化剂。对所制备材料的形貌和光学性质进行了研究。与制备的WO和C点相比，C点/WO具有更强的光催化能力和优异的光催化降解罗丹明B的可回收性。例如，C点/WO达到的一级反应速率常数为0.01942 min，约为所制备WO的7.7倍。C点/WO光催化活性的增强归因于WO和C点的协同效应导致的光捕获能力增强和光生电子-空穴对的有效空间分离。即使经过3次使用循环，C点/WO的高光催化活性仍保持不变。同时，提出了C点/WO光催化活性增强的可能机制。
