Magnetically Separable and Durable MnFe2O4 for Efficient Catalytic Ozonation of Organic Pollutants

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School of Environmental Science & Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, P. R. China
§ Department of Chemistry and Biochemistry, Texas State University, San Marcos, Texas 78666, United States
*Tel.: +86 20 39332690. E-mail: [email protected] or [email protected] (S.T.).
*E-mail: [email protected] (Y.X.).
Cite this: Ind. Eng. Chem. Res. 2014, 53, 15, 6297–6306
Publication Date (Web):March 20, 2014
Copyright © 2014 American Chemical Society
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Magnetically separable MnFe2O4 was prepared successfully by a sol–gel combustion method. The synthesized MnFe2O4 was characterized by X-ray diffraction (XRD), scanning electronic microscopy (SEM), Brunauer–Emmett–Teller (BET) surface area, zeta potential, and magnetic hysteresis loops. The catalytic activity of MnFe2O4 was evaluated by the ozonation of 4-chlorophenol (4-CP) at different solution pH value, ozone gas concentration, MnFe2O4 dosage, and initial 4-CP concentration. The ozone consumption was monitored and the ·OH exposure was calculated in different processes. It was found that MnFe2O4 was highly effective in catalyzing ozone decomposition and favored to generate more hydroxyl radicals. Moreover, the synergistically catalytic effect between Mn and Fe in MnFe2O4 was confirmed. Finally, lifetime of MnFe2O4 was measured in a novel integrated membrane-heterogeneous catalytic ozonation reactor designed for the first time. All the experimental results show that MnFe2O4 is a highly recoverable, efficient, and durable catalyst in the ozonation.

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