Chemical Engineering Journal ( IF 15.1 ) Pub Date : 2022-04-25 , DOI: 10.1016/j.cej.2022.136584 Yong Zhang , Junyi Qiu , Bicheng Zhu , M.V. Fedin , Bei Cheng , Jiaguo Yu , Liuyang Zhang
Covalent organic frameworks (COFs) are burgeoning crystalline porous materials with great potential in photocatalysis, but their applications are mainly restricted by the speedy recombination rate of charge carriers. Herein, a step-scheme heterojunction ZnO/COF(TpPa-Cl) is fabricated by a simple electrostatic self-assembly method, and its photocatalytic H2O2 production performance is also investigated. The S-scheme heterojunction between ZnO and TpPa-Cl contributes to enhanced light absorption, promoted reactant adsorption capacity, increased redox power, and efficient separation and transfer of photogenerated charge carriers, leading to an improved photocatalytic H2O2 evolution activity. The optimal composite possesses the maximum H2O2 evolution rate of 2443 μmol·g−1·h−1 under simulated solar light irradiation, which is about 3.3 and 8.7 times higher than pristine ZnO nanoparticles and TpPa-Cl, respectively. Moreover, the charge transfer pathway in S-scheme heterojunction photocatalysts is well elucidated. This investigation provides designing guidelines in the construction of other COF-based S-scheme heterojunctions.
中文翻译:
用于改善光催化 H2O2 生产性能的 ZnO/COF S 型异质结
共价有机骨架(COFs)是新兴的结晶多孔材料,在光催化方面具有巨大潜力,但其应用主要受限于电荷载流子的快速复合率。在此,通过简单的静电自组装方法制备了阶梯式异质结ZnO/COF(TpPa-Cl),并研究了其光催化H 2 O 2生产性能。ZnO和TpPa-Cl之间的S型异质结有助于增强光吸收,提高反应物吸附能力,增加氧化还原能力,有效分离和转移光生载流子,从而提高光催化H 2 O 2释放活性。最优复合材料具有最大 H模拟太阳光照射下2 O 2的释放速率为2443 μmol·g -1 ·h -1,分别是原始ZnO纳米粒子和TpPa-Cl的3.3倍和8.7倍。此外,S型异质结光催化剂中的电荷转移途径也得到了很好的阐明。该研究为构建其他基于 COF 的 S 型异质结提供了设计指南。