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http://dx.doi.org/10.4191/kcers.2012.49.2.135

Enhanced Photocatalytic Efficiency of Nanoscale NiS2/TiO2 Catalysts Synthesized by Hydrothermal and Sol-gel Method  

Zhu, Lei (Department of Advanced Materials Science & Engineering, Hanseo University)
Meng, Ze-Da (Department of Advanced Materials Science & Engineering, Hanseo University)
Ghosh, Trisha (Department of Advanced Materials Science & Engineering, Hanseo University)
Oh, Won-Chun (Department of Advanced Materials Science & Engineering, Hanseo University)
Publication Information
Journal of the Korean Ceramic Society / v.49, no.2, 2012 , pp. 135-141 More about this Journal
Abstract
To improve the visible-light induced photocatalytic application performances of $TiO_2$, in this study, the $NiS_2$ modied $TiO_2$ composites were prepared by two methods: hydrothermal method and sol-gel method. The composites were denoted as hs-$NiS_2$/$TiO_2$, and sg-$NiS_2$/$TiO_2$ and characterized by XRD, UV-vis absorbance spectra, SEM, TEM, EDX, and BET analysis. The photocatalytic activities under visible light were investigated by the degradation of methyl orange (MO). The photodegradation rate of methyl orange under visible light with $NiS_2$/$TiO_2$ composites was markedly higher than that of pure $TiO_2$, and the effect of hs-$NiS_2$/$TiO_2$ composites was better than that of sg-$NiS_2$/$TiO_2$. The results indicate that the hydrothermal process could partly inhibit the agglomeration of $NiS_2$/$TiO_2$. Thus, the dispersion of nanoparticles was improved, and that the promoting effect of $NiS_2$ could extend the light absorption spectrum toward the visible region.
Keywords
Nickel disulfide; Titanium dioxide; Hydrothermal method; Visible-light photocatalytic activity;
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Times Cited By KSCI : 1  (Citation Analysis)
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