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Erschienen in: Journal of Sol-Gel Science and Technology 2/2018

31.05.2018 | Original paper: Sol-gel and hybrid materials for catalytic, photoelectrochemical and sensor applications

Novel synthetic route for low-cost carbon-modified TiO2 with enhanced visible light photocatalytic activity: carbon content and calcination effects

verfasst von: Nicolas Perciani de Moraes, Maria Lucia Caetano Pinto da Silva, Tiago Moreira Bastos Campos, Gilmar Patrocínio Thim, Liana Alvares Rodrigues

Erschienen in: Journal of Sol-Gel Science and Technology | Ausgabe 2/2018

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Abstract

The aim of this study was the development of low-cost tannin-formaldehyde xerogel/TiO2 (XTi-w) and carbon xerogel/TiO2 (XTiC-w) photocatalysts. The materials used as precursors were recycled titanium scraps and black wattle tannin extract, highlighting the low-cost approach employed in the synthesis. The materials were characterized by diffuse reflectance spectroscopy, scanning electron microscopy, dispersive energy spectrophotometry, X-ray diffractometry, infrared and Raman spectroscopy. X-ray diffractometry showed that the XTiC-w have tetragonal crystalline structure (anatase), whereas the XTi-w has an amorphous structure. The Raman and infrared analysis also showed the presence of titanium dioxide in the composition of both XTi-w and XTiC-w. XTi-w and XTiC-w showed photocatalytic activity at the visible wavelength. Titanium dioxide displayed no photocatalytic activity at the visible wavelength. The XTi-60 composite displayed the highest efficiency in the removal of the methylene blue from the system, as well as good reusability properties. The radicals with higher influence in the photocatalytic reaction mechanism are the photo generated electron and the singlet oxygen molecule. The effect of the heat treatment is negative on the photocatalytic properties of the hybrids produced, due to the removal of acid sites, adsorbed water and OH surface groups.

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Metadaten
Titel
Novel synthetic route for low-cost carbon-modified TiO2 with enhanced visible light photocatalytic activity: carbon content and calcination effects
verfasst von
Nicolas Perciani de Moraes
Maria Lucia Caetano Pinto da Silva
Tiago Moreira Bastos Campos
Gilmar Patrocínio Thim
Liana Alvares Rodrigues
Publikationsdatum
31.05.2018
Verlag
Springer US
Erschienen in
Journal of Sol-Gel Science and Technology / Ausgabe 2/2018
Print ISSN: 0928-0707
Elektronische ISSN: 1573-4846
DOI
https://doi.org/10.1007/s10971-018-4700-4

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