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Open AccessArticle

TiO2/S-Doped Carbons Hybrids: Analysis of Their Interfacial and Surface Features

1
Department of Chemistry and Biochemistry, The City College of New York, New York, NY 10031, USA
2
Unidad de Desarrollo Tecnológico (UDT), Universidad de Concepción, 403000 Concepción, Chile
3
Millennium Nuclei on Catalytic Processes towards Sustainable Chemistry (CSC), 7810000 Santiago, Chile
*
Authors to whom correspondence should be addressed.
Molecules 2019, 24(19), 3585; https://doi.org/10.3390/molecules24193585
Received: 1 September 2019 / Revised: 2 October 2019 / Accepted: 4 October 2019 / Published: 5 October 2019
Hybrids containing approximately equal amounts of P25 TiO2 and S-doped porous carbons were prepared using a water-based slurry mixing method. The materials were extensively characterized by adsorption of nitrogen, potentiometric titration, thermal analysis in air and in helium, XRD, XPS and SEM. The collected results showed the significant blockage of carbon micropores by TiO2 particles deposited on their outer surface. The formation of a new interface, especially for the S-rich samples, might also contribute to the porosity alteration. Analysis of surface chemistry suggested the presence of Ti-S bonds with an involvement of sulfur from thiophenic species in the carbon phase. The latter, especially when polymer-derived, was mainly deposited on the TiO2 nanoparticles. Formation of Ti-S stabilized sulfur and increased the ignition temperature of the hybrids, especially those with a high content of sulfur, in comparison with the ignition temperature of carbons. The surfaces of hybrid with S-containing carbons was also thermally very stable and of basic chemical nature. The formation of interfacial structures Ti-C was detected by XPS analysis suggesting a partial reduction of the Ti. View Full-Text
Keywords: S-doped carbon; TiO2; hybrids; surface chemistry; porosity; interface S-doped carbon; TiO2; hybrids; surface chemistry; porosity; interface
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MDPI and ACS Style

Bandosz, T.J.; Policicchio, A.; Florent, M.; Poon, P.S.; Matos, J. TiO2/S-Doped Carbons Hybrids: Analysis of Their Interfacial and Surface Features. Molecules 2019, 24, 3585.

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