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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 5, 2015, pp. 1669-1676
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Bioline Code: st15155
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 12, No. 5, 2015, pp. 1669-1676
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Potential application of novel TiO2/β-FeOOH composites for photocatalytic reduction of Cr(VI) with an analysis of statistical approach
Zhang, M.; Xu, Z.; Liang, J.; Zhou, L. & Zhang, C.
Abstract
In this paper, four TiO2/β-FeOOH photocatalysts
were synthesized by a simple deposition–precipitation
method and characterized by X-ray diffraction, fourier
transform infrared, scanning electron microscope and
transmission electron microscope. The characterization
showed the presence of nano-sized β-FeOOH particles on
the TiO2 support. The photocatalytic efficiency of the
catalysts was examined on the Cr(VI) reduction under
ultraviolet irradiation in aqueous suspension. The photocatalyst
denoted as 25TiO2/β-FeOOH appeared to be most
efficient, which is due to effectively inhibiting the recombination
of photoinduced electrons and holes. A 24 factorial
design methodology was employed to evaluate the statistically
important operating conditions (pH of the solution,
loading of catalyst, Cr(VI) concentration and reaction time)
and their interactions on the photocatalytic reduction efficiency
of Cr(VI) over 25TiO2/β-FeOOH.
Keywords
Chromium reduction; Photocatalysis; TiO2/β-FeOOH; Composites; Factorial design
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