Photocatalytic activity and antibacterial properties of Ag/N-doped TiO2 nanoparticles on PVAE-CS nanofibre support

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dc.contributor.advisorTichagwa, Len
dc.contributor.authorOcwelwang, Atsile Rosyen
dc.date.accessioned2026-08-12T23:53:32Z
dc.date.available2026-08-12T23:53:32Z
dc.date.issued2012en
dc.description.abstractLack of potable water is one of the major challenges that the world faces currently and the effects of this are mainly experienced by people in developing countries. This has therefore propelled research in advanced oxidation technologies AOTs to improve the current water treatment methods using cost effective, non toxic and efficient treatment methods. Hence, in this study the sol-gel synthesis method was used to prepare TiO2 nanoparticles that were photocatalytically active under UV and visible solar light as well as possessing antibacterial properties. Silver and nitrogen doping was carried out to extend the optical absorption of TiO2. For easy removal and reuse of the photocatalyst the nanoparticles were immobilized on chitosan and poly (vinyl-alcohol-co-ethylene) using the electrospining technique. The synthesized nanomaterials were characterized by FTIR, XRD, SEM/EDS, TEM, DRS, and TGA. FTIR and EDS analysis confirmed the formation and composition of TiO2 nanopowders for the doped and undoped nanoparticles. XRD analysis showed that the anatase phase was the dominant crystalline phase of the synthesized nanopowders. SEM and TEM respectively illustrated the distribution and size of the electrospun nanofibers and the nanoparticles of TiO2. DRS results showed that there was a significant shift in the absorption band edge and wavelength of Ag-TiO2 to 397 nm, followed by N-TiO2 at 396 nm compared to the commercial titania which was at 359 nm. The photocatalytic activities and antibacterial properties of these materials were tested on methylene blue dye and E.coli microorganism respectively. Ag-TiO2 immobilized on nanofibers of chitosan and PVAE had the highest photocatalytic activity compared to N-TiO2. Similar results were observed when the biocide properties of these materials were tested on E. coli.en
dc.format95 leaves; 30 cmen
dc.formatpdfen
dc.identifier.citation2012en
dc.identifier.othervital:11337en
dc.identifier.otherhttp://hdl.handle.net/10353/d1006794en
dc.identifier.otherNanocomposites (Materials)en
dc.identifier.otherNanofibersen
dc.identifier.otherElectrospinningen
dc.identifier.urihttp://hdl.handle.net/20.500.11837/4578
dc.language.isoEnglishen
dc.publisherUniversity of Fort Hareen
dc.publisherFaculty of Science & Agricultureen
dc.rightsUniversity of Fort Hareen
dc.subjectNanocomposites (Materials)en
dc.subjectNanofibersen
dc.subjectElectrospinningen
dc.titlePhotocatalytic activity and antibacterial properties of Ag/N-doped TiO2 nanoparticles on PVAE-CS nanofibre supporten
dc.title.alternativePhotocatalytic activity and antibacterial properties of Ag/N-doped TiO2 nanoparticles on PVAE-CS nanofibre supporten
dc.typeThesisen
dc.typeMastersen
dc.typeMSc (Chemistry)en

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