Distinguishing homogeneous advanced oxidation processes in bulk water from heterogeneous surface reactions in organic oxidation

• DOI: 10.1073/pnas.2302407120
• Publication Date: 2023-05-08T19:17:50Z
• Authors: Ying-Jie Zhang; Jie-Jie Chen; Gui-Xiang Huang; Wen-Wei Li; Han-Qing Yu; Menachem Elimelech
• Keywords: Persulfate; Nanomaterial-based catalyst; Advanced oxidation process; Catalytic Oxidation

Clarifying the reaction pathways at solid-water interface and in bulk water solution is of great significance for design heterogeneous catalysts selective oxidation organic pollutants. However, achieving this goal daunting because intricate interfacial reactions catalyst surface. Herein, we unravel origin with metal oxide catalysts, revealing that radical-based advanced processes (AOPs) prevail but not on solid surfaces. We show such differing widely exist various chemical (e.g., high-valent Mn3+ MnOX) Fenton Fenton-like catalytic Fe2+ FeOCl catalyzing H2O2, Co2+ Co3O4 persulfate) systems. Compared degradation polymerization one-electron indirect AOP homogeneous reactions, provide unique surface properties to trigger surface-dependent coupling a two-electron direct oxidative transfer process. These findings fundamental understanding interface, which could guide nanocatalysts.