Abstract: Developing non-radical PMS-activated degradation systems with excellent anti-interference and selectivity is a valuable strategy for solving the inefficiency of radical systems in actual aqueous conditions. Herein, MnFe-LDH modified by the ultrathin g-C₃N₄ (LCNx) was designed to achieve the electron transfer pathway (ETP) of PMS activation for antibiotics degradation. The ultrathin g-C₃N₄ can provide plenty of Ï€ delocalized electrons to improve the electronic cloud density of the Fe site, which promotes the PMS adsorption but keeps O-O bond stable in PMS to generate Fe-PMS* complex. Mn site supplements the electrons of the Fe site, and also facilitates the electron transfer from the pollutant to the Fe-PMS*. The LCNx/PMS system exhibits an efficient electron transfer-dominated non-radical degradation pathway, resulting in the optimum efficient degradation activity of 96.9 % within 20 min for tetracycline (TC) and a reaction rate constant of 0.149 min^-1, which is 3.24 times that of pure MnFe-LDH. LCNx has excellent environmental adaptability and high stability, allowing it to maintain effective catalytic activity in actual water bodies and industrial wastewater. This study provides a wonderful perspective to significantly enhance the non-radical pathway dominated by electron transfer to pollutant degradation in the actual environment.

Key words: MnFe-LDH, g-C₃N₄, PMS adsorption, Non-radical pathway, Electron transfer pathway