The polarized electric field on Fe2O3/g-C3N4 for efficient peroxymonosulfate activation: A synergy of 1O2, electron transfer and pollutant oxidation

Abstract The non-radical mechanism is needed further exploration to develop non-radical. Based on theoretical calculation and experiments, a mechanism of polarization electric field promoting non-radical reaction on Fe2O3/g-C3N4 was proposed. With the polarization electric field, the electron polarization distribution and electron donation of hydroxy compounds achieve and promote electron transfer, thereby enhancing the non-radical mechanism of surface-bound reactive complex and 1O2. Therefore, the kinetics reaction rate of bisphenol A in Fe2O3/g-C3N4/peroxymonosulfate (PMS) is 17.7 times faster than Fe2O3/PMS. The main ways of electron transfer and 1O2 combined by pollutants, Fe2O3/g-C3N4 and PMS are proposed. Benefiting from the non-free radical mechanism, the Fe2O3/g-C3N4/PMS system is highly tolerant to inorganic anions and actual water bodies (lake water, tap water and groundwater). This study provides a way to synergize the non-radical reaction of 1O2 and surface reactive complexes, and deepen the understanding of the mechanism in non-radical reactions.