Rational synthesis of Na and S co-catalyst TiO2-based nanofibers: presence of surface-layered TiS3 shell grains and sulfur-induced defects for efficient visible-light driven photocatalysis

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buir.contributor.authorUyar, Tamer
buir.contributor.orcidUyar, Tamer|0000-0002-3989-4481
dc.citation.epage14219en_US
dc.citation.issueNumber27en_US
dc.citation.spage14206en_US
dc.citation.volumeNumber5en_US
dc.contributor.authorRanjith, K. S.en_US
dc.contributor.authorUyar, Tameren_US
dc.date.accessioned2018-04-12T11:06:44Z
dc.date.available2018-04-12T11:06:44Z
dc.date.issued2017en_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.description.abstractSurface-modified TiO2 nanofibers (NFs) with tunable visible-light photoactive catalysts were synthesised through electrospinning, followed by a sulfidation process. The utilization of sodium-based sulfidation precursors effectively led to the diffusion and integration of sulfur impurities into TiO2, modifying its band function. The optical band function of the sulfur-modified TiO2 NFs can be easily manipulated from 3.17 eV to 2.28 eV through surface modification, due to the creation of oxygen vacancies through the sulfidation process. Sulfidating TiO2 NFs introduces Ti-S-based nanograins and oxygen vacancies on the surface that favor the TiO2-TiS3 core-shell interface. These defect states extend the photocatalytic activity of the TiO2 NFs under visible irradiation and improve effective carrier separation and the production of reactive oxygen species. The surface oxygen vacancies and the Ti-S-based surface nanograins serve as charge traps and act as adsorption sites, improving the carrier mobility and avoiding charge recombination. The diffused S-modified TiO2 NFs exhibit a degradation rate of 0.0365 cm-1 for RhB dye solution, which is 4.8 times higher than that of pristine TiO2 NFs under visible irradiation. By benefiting from the sulfur states and oxygen vacancies, with a narrowed band gap of 2.3 eV, these nanofibers serve as suitable localized states for effective carrier separation.en_US
dc.description.provenanceMade available in DSpace on 2018-04-12T11:06:44Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 179475 bytes, checksum: ea0bedeb05ac9ccfb983c327e155f0c2 (MD5) Previous issue date: 2017en
dc.identifier.doi10.1039/c7ta02839cen_US
dc.identifier.issn2050-7488
dc.identifier.urihttp://hdl.handle.net/11693/37234
dc.language.isoEnglishen_US
dc.publisherRoyal Society of Chemistryen_US
dc.relation.isversionofhttps://doi.org/10.1039/c7ta02839cen_US
dc.source.titleJournal of Materials Chemistry Aen_US
dc.subjectCatalystsen_US
dc.subjectDegradationen_US
dc.subjectIrradiationen_US
dc.subjectNanofibersen_US
dc.subjectOxygenen_US
dc.subjectPhotocatalysisen_US
dc.subjectSodiumen_US
dc.subjectSulfuren_US
dc.subjectSurface defectsen_US
dc.subjectCarrier separationen_US
dc.subjectCharge recombinationsen_US
dc.subjectCore-shell interfaceen_US
dc.subjectPhotocatalytic activitiesen_US
dc.subjectReactive oxygen speciesen_US
dc.subjectSurface oxygen vacanciesen_US
dc.subjectVisible irradiationen_US
dc.subjectVisible-light-drivenen_US
dc.subjectOxygen vacanciesen_US
dc.titleRational synthesis of Na and S co-catalyst TiO2-based nanofibers: presence of surface-layered TiS3 shell grains and sulfur-induced defects for efficient visible-light driven photocatalysisen_US
dc.typeArticleen_US

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