ABSTRACT Electron‐transfer‐involved persulfate‐based advanced oxidation processes (ET‐AOPs) are attractive for wastewater treatment because of their high selectivity and environmental robustness. However, ET‐AOPs are intrinsically dual‐site reaction requiring efficient electron transfer between persulfate‐binding and pollutant‐binding sites. This constraint is often obscured in powder catalysts but becomes critical when reactions in integrated catalytic membranes or devices, where spatial separa