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Fe3O4/FeS2 activated H2O2 degradation of typical phenylarsonic acid pollutants |
HUA Jie, WANG Min, LIN Shu-ting, JIANG Yan-ting, LIN Chun-xiang, LV Yuan-cai, LIU Ming-hua |
Department of Environmental Science and Engineering, Fuzhou University, Fuzhou 350108, China |
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Abstract Fe3O4/FeS2 catalyst was successfully prepared by hydrothermal method, and employed to mediate a heterogeneous Fenton system for the remediation of a typical phenylarsonic acid pollutant (roxarsone, ROX). The characterization results of XRD, SEM, XPS and magnetic measurement system (VSM) showed that Fe3O4/FeS2 displayed evident granular particles and good magnetic properties. The results of ROX degradation experiments showed that under optimal conditions (4.5of the initial pH, 20mg/L of ROX initial concentration, 0.15g/L of Fe3O4/FeS2 dosage and 0.034g/L of H2O2 concentration), the heterogeneous Fenton system could instantaneously degrade 96.74% of ROX in 1min, which was much better than of the systems mediated by sole Fe3O4 or FeS2. In addition, Fe3O4/FeS2 could be effectively recycled by magnets, and also exhibited good reusability. After 3 runs, the degradation efficiency of ROX was still over 80%. Mechanism analysis revealed that plenty of hydroxyl radicals (·OH) could be generated via the catalytic reaction between Fe3O4/FeS2 and H2O2. Subsequently, the ·OH could quickly attacked the C-As, C-N, and C-C bonds in the ROX molecule, resulting in the dearsenication, denitrification and ring opening reactions, as well as the formation of a series of organic products (such as phenols, quinones, small molecular organic acids, etc.) and inorganic products (As(V) and NO3-). Finally, the released inorganic arsenic could be adsorbed on the surface of the catalyst, while the organic product was further mineralized.
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Received: 08 November 2020
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