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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.
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참고문헌 (20)
참고문헌 신청
Fujishima, A. / 1972 / Electrochemical photolysis of water at a semiconductor electrode / Nature 238:37~38
Fujishima, A. / 2000 / Titanium dioxide photocatalysis / J. Phorochem. Photobio C Photochem. Review 1:1~21
Gaya, U.I. / 2008 / Heterogeneous photocatalytic degradation of organic contaminants over titanium dioxide: A review of fundamentals, progress and problems / J. Phorochem. Photobio C Photochem. Review 9:1~12
Agrios, A. G. / 2005 / State of the perspectives on materials and applications of photocatalysis over TiO2 / J. Appl. Electrochem. 35:655~663
Andreozzi, R. / 2000 / Photocatalytic oxidation of 4-nitrophenol in aqueous TiO2 slurries: An experimental validation of literature kinetic models / J. Chem. Technol. Biotechnol. 75(2):131~136
Fujishima, A. / 2000 / Titanium dioxide photocatalysis / J. Phorochem. Photobio C Photochem. Review 1:1~21
Gaya, U.I. / 2008 / Heterogeneous photocatalytic degradation of organic contaminants over titanium dioxide: A review of fundamentals, progress and problems / J. Phorochem. Photobio C Photochem. Review 9:1~12
Agrios, A. G. / 2005 / State of the perspectives on materials and applications of photocatalysis over TiO2 / J. Appl. Electrochem. 35:655~663
Andreozzi, R. / 2000 / Photocatalytic oxidation of 4-nitrophenol in aqueous TiO2 slurries: An experimental validation of literature kinetic models / J. Chem. Technol. Biotechnol. 75(2):131~136
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