Key Laboratory of Jiangxi Province for Persistent Pollutants Prevention Control and Resource Reuse, Nanchang Hangkong University, Nanchang, 330063, PR China; National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resources Utilization, Nanchang Hangkong University, Nanchang, 330063, PR China.
Key Laboratory of Jiangxi Province for Persistent Pollutants Prevention Control and Resource Reuse, Nanchang Hangkong University, Nanchang, 330063, PR China; National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resources Utilization, Nanchang Hangkong University, Nanchang, 330063, PR China.
Chemosphere. 2024 Sep;363:142996. doi: 10.1016/j.chemosphere.2024.142996. Epub 2024 Aug 2.
Photocatalytic degradation of pollutants coupled with hydrogen (H) evolution has emerged as a promising solution for environmental and energy crises. However, the fast recombination of photoexcited electrons and holes limits photocatalytic activities. Herein, an S-scheme heterojunction carbon doped-TiO/ZnInS (C-TiO/ZnInS) was designed by substituting oxygen sites within C-TiO by ZnInS. Under visible light irradiation, the optimal C-TiO/ZnInS exhibits a higher degradation efficiency (88.6%) of microcystin-LR (MC-LR), compared to pristine C-TiO (72.9%) and ZnInS (66.8%). Furthermore, the H yield of the C-TiO/ZnInS reaches 1526.9 μmol g h, which is 3.83 times and 2.87 times that of the C-TiO and ZnInS, respectively. Experimental and theoretical investigations reveal that an internal electric field (IEF) informed in the C-TiO/ZnInS heterojunction, accelerates the separation of photogenerated charge pairs, thereby enhancing photocatalytic efficiency of MC-LR degradation and H production. This work highlights a new perspective on the development of high-performance photocatalysts for wastewater treatment and H generation.
光催化降解污染物与氢气（H）的产生已成为应对环境和能源危机的一种很有前途的解决方案。然而，光激发电子和空穴的快速复合限制了光催化活性。本文通过用 ZnInS 取代 C-TiO 中的氧位，设计了一种 S 型异质结碳掺杂 TiO/ZnInS（C-TiO/ZnInS）。在可见光照射下，与原始 C-TiO（72.9%）和 ZnInS（66.8%）相比，最佳的 C-TiO/ZnInS 对微囊藻毒素-LR（MC-LR）的降解效率（88.6%）更高。此外，C-TiO/ZnInS 的 H 产率达到 1526.9 μmol g h，分别是 C-TiO 和 ZnInS 的 3.83 倍和 2.87 倍。实验和理论研究表明，C-TiO/ZnInS 异质结中存在的内电场（IEF）加速了光生载流子对的分离，从而提高了 MC-LR 降解和 H 产生的光催化效率。这项工作为开发用于废水处理和 H 生成的高性能光催化剂提供了新的视角。
