Surface hydroxyl groups mediated g-C3N4-Modified perovskite catalytic ozone oxidation interface activation and silicon salt resistance mechanism

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2024-06, Vol.490, p.151302, Article 151302
• Main Authors: Wang, Shengzhe, Li, Xianru, Xue, Weiyang, Gu, Bin, Han, Peiwei, Yao, Chenxing, Wei, Huangzhao, Sun, Chenglin
• Format: Article
• Language: English
• Subjects: Ozone catalytic oxidation; regulating ROS pathways; Silicon salt resistance; Surface hydroxyl groups; Water pollution control
• ISSN: 1385-8947
• DOI: 10.1016/j.cej.2024.151302

[Display omitted] •LFMO-CN were prepared for catalytic ozonation of Si-containing m-cresol wastewater.•The interface regulation of CN promotes the generation of surface hydroxyl groups.•Surface hydroxyl groups regulated reactive oxygen radicals (ROS) generation.•Surface hydroxyl groups reduced the energy barrier for ·OH production.•Silicon resistance of the LFMO-CN was maximized via the surface hydroxyl groups. Elucidating the activation mechanisms of ozone at the catalyst interface and enhancing the catalyst's resistance to salt are crucial for its practical application. In this study, LaFe0.26Mn0.74O3-δ-g-C3N4 (LFMO-CN) perovskite catalysts were prepared for catalytic ozonation treatment of silicon-containing m-cresol wastewater. The LFMO-50CN achieved 100 % m-cresol removal and 70.2 % mineralization. Compared to LFMO, the silicon resistance of LFMO-50CN was improved by 2.4 times. The interface regulation of CN promotes the generation of hydroxyl groups on the surface of LFMO-50CN. Density functional theory (DFT) calculation revealed that surface hydroxyl groups regulated reactive oxygen radicals (ROS) generation, reducing the energy barrier for ·OH production. The main pathway for the generation of ·OH was O3 → HO3· → ·OH. Furthermore, LFMO-50CN exhibited excellent stability over 15 cycles. This study systematically investigated the role of surface hydroxyl groups in controlling ozone activation and silicon salt resistance mechanisms, providing insights for catalyst design and application.