Li Shu-Ting, Chang Ling, Wang Kai, Xie Jianhui, Chen Wei, Huang Guo-Bo, Yin Hongfei
School of Pharmaceutical and Chemical Engineering, Taizhou University, Jiaojiang 318000, Zhejiang Province, PR China.
School of Pharmaceutical and Chemical Engineering, Taizhou University, Jiaojiang 318000, Zhejiang Province, PR China.
Chemosphere. 2023 Nov;341:140117. doi: 10.1016/j.chemosphere.2023.140117. Epub 2023 Sep 7.
The exploration of efficient heterogeneous catalysts for persistent organic pollutant removal is extremely attractive. In the present work, MnO/MnO photo-Fenton catalysts were designed by a facile hydrothermal route to activate peroxymonosulfate (PMS) under visible light irradiation for organic pollutant degradation. The optimized MnO/MnO heterojunction shows excellent Rhodamine B (RhB) removal efficiency, whose apparent kinetic constant is 11.9 and 5.36 times as high as the MnO and MnO. Meanwhile, there is a neglectable attenuation in catalytic performance after 5 recycling runs. Based on the active species trapping experiments, the non-radical process contributes more than the radical process during RhB degradation. Moreover, factors including the dosage of PMS, initial RhB concentration, initial pH, the presence of various anions, different organic pollutants, and water sources are investigated. Systematical characterizations reveal that the enlarged specific surface areas and the efficient charge separation aroused from the Z-scheme mechanism are attributed to the enhanced photo-Fenton performance. The present work contributes to the construction of the Mn-based photo-Fenton catalyst with efficient PMS activation capacity for environmental remediation.
探索用于去除持久性有机污染物的高效非均相催化剂极具吸引力。在本工作中，通过简便的水热路线设计了MnO/MnO光芬顿催化剂，以在可见光照射下活化过一硫酸盐（PMS）用于有机污染物降解。优化后的MnO/MnO异质结表现出优异的罗丹明B（RhB）去除效率，其表观动力学常数分别是MnO和MnO的11.9倍和5.36倍。同时，经过5次循环运行后，催化性能的衰减可忽略不计。基于活性物种捕获实验，在RhB降解过程中，非自由基过程比自由基过程贡献更大。此外，还研究了PMS用量、初始RhB浓度、初始pH值、各种阴离子的存在、不同有机污染物以及水源等因素。系统表征表明，由Z型机制引起的比表面积增大和电荷有效分离归因于光芬顿性能的增强。本工作有助于构建具有高效PMS活化能力的锰基光芬顿催化剂用于环境修复。
