Catalytic ozonation performance and surface property of supported Fe₃O₄ catalysts dispersions

Abstract

Fe₃O₄ was supported on mesoporous Al₂O₃ or SiO₂ (50 wt.%) using an incipient wetness impregnation method, and Fe₃O₄/Al₂O₃ exhibited higher catalytic efficiency for the degradation of 2,4-dichlorophenoxyacetic acid and para-chlorobenzoic acid aqueous solution with ozone. The effect and morphology of supported Fe₃O₄ on catalytic ozonation performance were investigated based on the characterization results of X-ray diffraction, X-ray photoelectron spectroscopy, BET analysis and Fourier transform infrared spectroscopy. The results indicated that the physical and chemical properties of the catalyst supports especially their Lewis acid sites had a significant influence on the catalytic activity. In comparison with SiO₂, more Lewis acid sites existed on the surface of Al₂O₃, resulting in higher catalytic ozonation activity. During the reaction process, no significant Fe ions release was observed. Moreover, Fe₃O₄/Al₂O₃ exhibited stable structure and activity after successive cyclic experiments. The results indicated that the catalyst is a promising ozonation catalyst with magnetic separation in drinking water treatment.

Keywords

heterogeneous catalytic ozonation / iron oxides / supports / surface Lewis acid sites

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Acknowledgements

This work was supported by the Special Co-Construction Project of Beijing Municipal Commission of Education, the National Natural Science Foundation of China (Grant Nos. 20977104 and 21125731) and the National Basic Research Program of China (No. 2010CB933604).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg