Journal
CHEMICAL ENGINEERING JOURNAL
Volume 248, Issue -, Pages 9-17Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2014.03.016
Keywords
Arsenite oxidation; Photocatalytic oxidation; Ti-Mn hybrid oxide; Adsorption; Manganese oxide; Charge transfer
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Funding
- National Natural Science Foundation of China [21276193]
- National High Technology Research and Development Program of China (863 Program) [2012AA063504]
- Project of Ocean with Scientific Technology in Tianjin [KJXH2011-10]
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A Ti-Mn hybrid oxide (Ti-Mn-HO) that simultaneously contained anatase-TiO2 and Mn3O4 was prepared and applied to arsenite photocatalytic oxidization (PCO) under UV irradiation. X-ray diffraction (XRD), scanning electron microscopy with an energy dispersive spectrometer (SEM/EDS), transmission electron microscopy (TEM) and a N-2 adsorption-desorption method were employed to characterize the morphology of the catalyst. Kinetics experiments indicated that Mn3O4 promoted the PCO-adsorption process of arsenite [As(III)] better than either pure anatase-TiO2 under UV irradiation or Ti-Mn-HO without UV exposure. The cause of this phenomenon was investigated using Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). Finally, a synergistic effect for the transformation of photoproduct holes and electrons between the TiO2 and Mn3O4 phases is assumed. (C) 2014 Elsevier B.V. All rights reserved.
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