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Visible light induced photoreduction of methyl orange by N-doped mesoporous titania

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Title: Visible light induced photoreduction of methyl orange by N-doped mesoporous titania
Authors: Joshi, Meenal M.1, Labhsetwar, Nitin K.1, Mangrulkar, Priti A.1, Tijare, Saumitra N.1, Kamble, Sanjay P.2, Rayalu, Sadhana S.1 s_rayalu@neeri.res.in
Source: Applied Catalysis A: General. Mar2009, Vol. 357 Issue 1, p26-33. 8p.
Subjects: Photocatalysis, Chemical reduction, Dyes & dyeing, Titanium dioxide, Porous materials, Chemical templates, Chitosan
Abstract: Abstract: N-doped mesoporous titania was synthesized using templating method. Biopolymer chitosan was used as a template and also as a nitrogen source along with ammonium hydroxide. Three different types of N-doped mesoporous titania were synthesized by varying composition of chitosan and titania precursor. These photocatalysts were characterized using XRD, BET-SA, FTIR, UV-DRS, SEM–EDX and XPS analysis. The photocatalytic activity of mesoporous titania was studied by methyl orange (MO) photoreduction reaction. From the experimental results it was observed that the N-doped mesoporous titania (1:2) gives the highest photocatalytic reduction of MO as compared to N-doped mesoporous titania prepared with (1:1) and (1:3) stoichiometry. This could be due to the optimal level of ‘N’ incorporation in the N-doped mesoporous titania (1:2). Photocatalysts reduce the MO dye into derivative of hydrazine. Photoactivity of N-doped mesoporous titania (1:2) is 1.0721mg of MO reduced per g of TiO2 vis-à-vis 0.508mg of MO reduced per g of TiO2 for Degussa P25 photocatalyst. The effect of various operating parameters like photocatalyst loading, initial concentration and intensity of light also has been studied. [Copyright &y& Elsevier]
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Database: Engineering Source
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Abstract:Abstract: N-doped mesoporous titania was synthesized using templating method. Biopolymer chitosan was used as a template and also as a nitrogen source along with ammonium hydroxide. Three different types of N-doped mesoporous titania were synthesized by varying composition of chitosan and titania precursor. These photocatalysts were characterized using XRD, BET-SA, FTIR, UV-DRS, SEM–EDX and XPS analysis. The photocatalytic activity of mesoporous titania was studied by methyl orange (MO) photoreduction reaction. From the experimental results it was observed that the N-doped mesoporous titania (1:2) gives the highest photocatalytic reduction of MO as compared to N-doped mesoporous titania prepared with (1:1) and (1:3) stoichiometry. This could be due to the optimal level of ‘N’ incorporation in the N-doped mesoporous titania (1:2). Photocatalysts reduce the MO dye into derivative of hydrazine. Photoactivity of N-doped mesoporous titania (1:2) is 1.0721mg of MO reduced per g of TiO2 vis-à-vis 0.508mg of MO reduced per g of TiO2 for Degussa P25 photocatalyst. The effect of various operating parameters like photocatalyst loading, initial concentration and intensity of light also has been studied. [Copyright &y& Elsevier]
ISSN:0926860X
DOI:10.1016/j.apcata.2008.12.030