The effect of chalcogens such as sulphur (S), selenium (Se), and tellurium (Te) on the anatase to rutile phase transition (ART) of titanium dioxide (TiO2) was investigated. 2â€»mol % of chalcogen doped TiO2was synthesised via a sol-gel technique. The as-synthesised samples were calcined at different temperatures from 500â€»°C to 800â€»°C for 2â€»h. X-ray diffraction (XRD) and Raman spectroscopy were used to study the ART of TiO2. Te-TiO2showed the highest anatase phase (44%) at 750â€»°C as compared to other samples. X-ray photoelectron spectroscopy (XPS) and UV-visible diffuse reflectance spectroscopy (UV-DRS) was further utilised to investigate the oxidation state and optical properties. UV-DRS results showed that the substitutional doping of chalcogens in the TiO2lattice enhanced visible light absorption. The photocatalytic efficiency was tested for the disinfection of Escherichia coli (E.coli) under visible light irradiation. It is noted that while the chalcogen modified TiO2improved the anatase stability the antimicrobial activity is not significantly enhanced compared to pure anatase TiO2under visible light illumination. Te-TiO2attained 100% disinfection within 70â€»min of visible light irradiation and maintained equal antibacterial efficiency as pure TiO2at 750â€»°C.
|Number of pages||7|
|Journal||Materials Today: Proceedings|
|Publication status||Published - 2019|
|Event||2019 Fall Meeting Metal Oxide- and Oxyhydride-based Nanomaterials for Energy and Environment-related Applications, EMRS 2019 - Warsaw, Poland|
Duration: Sep 16 2019 → Sep 19 2019
ASJC Scopus subject areas
- Materials Science(all)