LAUSR

Abstract In this study, it was demonstrated that the Fe ion was an effective promoter of bulk MoS2 for the activation of peroxymonosulfate (PMS) to degrade acetaminophen (ACT). ACT removal rate constant in the presence of 5 mg/L FeSO4·7H2O (0.1099 min−1) was approximately 20 times as that in the absence (0.0045 min−1) with 0.1 g/L MoS2 of FeSO4·7H2O at pH0 3. Both electron paramagnetic resonance (EPR) characterization and quenching experiment suggested the key role of singlet oxygen (1O2), acting as dominant reactive species responsible for ACT degradation in the Fe2+/MoS2/PMS system. Besides, the chemical state and composition of MoS2, the ion (Fe and Mo) concentrations and the speciation of Mo(VI) were investigated. Results suggested that the promoting effect of Fe(II) ion originated from the regeneration of Fe2+ mediated by MoS2, and the formation of molybdenum(VI) peroxo complex species in Fe2+/MoS2/PMS system. The present study not only provides an insight into PMS activation by MoS2 accelerated by Fe(II) ion, but also suggests an high-efficiency, easy-to-handle and environmentally friendly method to treat refractory wastewater.