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Rational interjecting of Na and S co-catalyzed TiO2 based nanofibers: Presence of surface layered TiS3 shell grains and sulphur induced defects for efficient visible-light driven photocatalytic properties

Abstract

Surface modified TiO2 nanofibers (NF) with tunable visible photo active catalyst were synthesised through electrospinning followed by sulfidation process. Utilizing the sodium (Na) based sulfidation precursors effectively diffused and intergrated the sulfur (S) impurties in TiO2 that can modify its band function. The optical band function of the sulfur modified TiO2 NF can be easily manipulated from 3.17 eV to 2.28 eV by the surface modification with the creation of oxygen vacancies through sulfidation process. Sulfidated TiO2 NF introduces the Ti-S based nanograins and oxygen vacancies on the surface which favor the TiO2-TiS3 based core-shell interface. These defect states extended the photocatalytic activity of the TiO2 NF under visible irradiation and improvises its effective carrier separation and production of reactive oxygen species. The surface oxygen vacancies and the Ti-S based surface nanograins serve as the charge traps and act as adsorption sites and improved the carrier mobility and avoided the charge recombination. The diffused form of S-modified TiO2 NF exhibited a degradation rate of 0.0365 cm-1 for RhB dye solution which is 4.8 times higher than pristine TiO2 NF under visible irradiation. By benefacting from the sulfur states and oxygen vacancies with a narrowed band gap of 2.3 eV, these nanofibers serve as the suitable localized states for the effective carrier separation.

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Publication details

The article was received on 01 Apr 2017, accepted on 11 Jun 2017 and first published on 12 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA02839C
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Rational interjecting of Na and S co-catalyzed TiO2 based nanofibers: Presence of surface layered TiS3 shell grains and sulphur induced defects for efficient visible-light driven photocatalytic properties

    K. S. Ranjith and T. Uyar, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA02839C

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