The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science & Technology, Wuhan 430081, PR China.
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science & Technology, Wuhan 430081, PR China.
Environ Int. 2019 Sep;130:104898. doi: 10.1016/j.envint.2019.06.008. Epub 2019 Jun 20.
A unique heterostructure is developed based on a 3D photoactive semiconductor and a 0D CuO QDs for superb photocatalytic reduction CO into CO. It reported a novel and simple method to prepare a 3D g-CN foam with micron-sized porous structures using ultrastable foam as a soft template for the first time. Moreover, CuO QDs are loaded onto 3D g-CN foam through a simple photodeposition strategy. Systematically characterization demonstrated that g-CN foam not only act as an excellent carrier for CuO QDs, but also greatly improve the photocatalytic performance by enhancing CO adsorption and gas transfer. Simultaneously, the rationally designed g-CN foam/CuO QDs exhibited notablely enhancement in photocatalytic performance with 3.9 times and 11 times higher than that of g-CN foam and bulk g-CN powder. The excellent photocatalytic activity can be attributed to the unique porous structure and the synergistic effect between g-CN foam and CuO QDs, which can speed up the transfer of charge carriers and urged the cumulation of photo-generated electrons on the CuO QDs. Our work provides new ideas for constructing 0D/3D hierarchical photocatalytic systems, which may provide guidance on designing efficient photocatalysts to maximize photocatalyst kinetics.
基于 3D 光活性半导体和 0D CuO QDs 开发了一种独特的异质结构，可将 CO 出色地光催化还原为 CO。它首次报道了一种新颖而简单的方法，即使用超稳定泡沫作为软模板，首次制备具有微米级多孔结构的 3D g-CN 泡沫。此外，通过简单的光沉积策略将 CuO QDs 负载到 3D g-CN 泡沫上。系统的表征表明，g-CN 泡沫不仅可以作为 CuO QDs 的优异载体，而且通过增强 CO 吸附和气体转移，还可以大大提高光催化性能。同时，合理设计的 g-CN 泡沫/CuO QDs 的光催化性能显著提高，比 g-CN 泡沫和块状 g-CN 粉末分别提高了 3.9 倍和 11 倍。优异的光催化活性归因于 g-CN 泡沫和 CuO QDs 之间的独特多孔结构和协同效应，这可以加速载流子的转移，并促使光生电子在 CuO QDs 上积累。我们的工作为构建 0D/3D 分级光催化系统提供了新的思路，这可能为设计高效光催化剂以最大化光催化剂动力学提供指导。
