Degradation of organic contaminants by OMS-2 activated persulfate
SHEN Yue1,2, CAO Hong-jian1, LIU Xiao-tian1,2, LIAO Yong-kai1,2, CAI Chao1
1. State Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract：In the present study, Manganese oxide octahedral molecular sieve (OMS-2PS) was synthesized using K2S2O8 and (CH3COO)2Mn·4H2O via a solid-phase method. The physicochemical properties of OMS-2PS were analyzed via X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). The performance of persulfate activation by OMS-2PS for degrading organic contaminants was examined. This study also investigated the effect of various parameters, including dosage of OMS-2PS, PS concentration, and initial pH, on AO7 removal efficiency. Moreover, the mechanism of PS activation by OMS-2PS was explored. The results showed OMS-2PS was successfully synthesized via a solid-phase method, which exhibits a nanorod structure. OMS-2PS could activate PS to degrade organic contaminants. The use of 50mg/L AO7, 1.0g/L OMS-2PS, and 2.0mmol/L PS led to the AO7 removal and mineralization rates of 97.4% and 50.1%, respectively. Ion coexistence experiments demonstrated that AO7 removal was considerably inhibited by Cl−, NO3−, and CO32−, while HA had almost no effect on it. The free radical quenching experiments and electron paramagnetic resonance (EPR) analysis indicated ·OH and SO4•−were the primary active oxygen species in the OMS-2PS/PS system, and ·OH played the dominant role in the AO7 degradation. XPS analysis revealed Mn(IV) and lattice oxygen on the surface of OMS-2PS were the main active sites for PS activation. Based on experiment results, a potential activation mechanism of PS by OMS-2PS was proposed that PS combined with OMS-2PS through the hydroxyl groups on the surface of OMS-2PS, and then PS reacted with the active sites on the surface of OMS-2PS to produce active oxygen species. In addition, The OMS-2PS/PS system effectively removed AO7 from different water bodies, and also degraded efficiently other pollutants including bisphenol A, naphthalene, and tetracycline, indicating that the OMS-2PS/PS system have a bright application prospect in environmental pollution control.
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