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DOI : 10.17640/KSWST.2016.24.2.3 ,    Vol.24, No.2, 3 ~ 12, 2016
Title
Preparation of Spinel Doped TiO₂ and Its Photocatalytic Activity Evaluation under Visible Light Irradiation-I
김종규 Jong Kyu Kim
Abstract
A novel spinel doped TiO₂ photocatalyst was prepared and evaluated its photocatalytic activity under visible light irradiation. The Congo red removal efficiency for various catalysts prepared in this research was shown as MgFe-TiO₂>Mg-TiO₂>Fe-TiO₂>MgFe. In order to obtain the optimized spinel doped TiO₂ photocatalyst for congo red removal, the composition ratio of TiO₂/Mg/Fe was evaluated using mixture analysis design. Increasing the percentage of MgFe doping over TiO₂ particles, the band gap between conduct band and valance band decreases, as a result showing better photocatalytic activity in visible light. Without TiO₂ in the composite, there was very low photocatalytic activity to remove CR, this can be explained that hydroxyl radicals and superoxide anions from TiO₂ has much stronger photocatalytic activity than oxides from Mg and/or Fe. Regression analysis on analysis of variance (ANOVA) showed high coefficients for determination value (R²=0.9948). The optimized composition ratio was calculated as TiO₂ 55.41mM, Mg 0.0303mM, Fe 0.01429mM. Therefore, mixture analysis model in this research can be used for evaluating the optimal composition ratio of TiO₂/Mg/Fe.
Key Words
Spinel, Magnesium ferrite, Photocatalysis, Mixture analysis, Titanium dioxide
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