Chitosan-modified TiO2 as photocatalyst for ethanol reforming under visible light

This work reports the reforming of bio-ethanol on chitosan–TiO 2 hybrid photocatalysts at ambient temperature. The influence of chitosan composition on the photocatalytic performance of chitosan–TiO 2 hybrid was studied. The hybrids were characterized by CHN elemental analysis, nitrogen adsorption–d...

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Bibliographic Details
Published in:	Chemical papers Vol. 71; no. 6; pp. 1129 - 1141
Main Authors:	Oliveira, Ana Cláudia M., Santos, Marluce S., Brandão, Luma M. S., Navarro Yerga, R. M., Fierro, J. L. G., Leite, Manuela S., Cavalcantia, Eliane B., Figueiredo, Renan Tavares
Format:	Journal Article
Language:	English
Published:	Cham Springer International Publishing 01-06-2017
Subjects:	Biochemistry Biotechnology Chemistry Chemistry and Materials Science Chemistry/Food Science Industrial Chemistry/Chemical Engineering Materials Science Medicinal Chemistry Original Paper TiO Chitosan Ethanol Hydrogen Photocatalysis
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Summary:	This work reports the reforming of bio-ethanol on chitosan–TiO 2 hybrid photocatalysts at ambient temperature. The influence of chitosan composition on the photocatalytic performance of chitosan–TiO 2 hybrid was studied. The hybrids were characterized by CHN elemental analysis, nitrogen adsorption–desorption isotherms, thermogravimetric analysis, diffuse reflectance spectroscopy, X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results showed that the preparation variables used for the incorporation of chitosan on TiO 2 promoted changes in the morphology, superficial area, crystal size and porosity of the photocatalyst, affecting the band gap of this semiconductor and consequently the reactivity of the chitosan–TiO 2 hybrids. The catalysts were evaluated for hydrogen production from ethanol under visible light. It was demonstrated that the calcination temperature of 623 K and a chitosan content of 20% were the most appropriate preparation conditions and the resulting product displays a pore size of 1.9 nm, crystal size of 11.3 nm, BET area of 178 m 2 g −1 and band gap of 2.92 eV. The calcination temperature of 623 K and incorporation of 20% of chitosan obtained the same results in the conversion rate of hydrogen in comparison to the pure TiO 2 P25.
ISSN:	2585-7290 1336-9075
DOI:	10.1007/s11696-016-0095-2