title: Photodegradation of organic pollutants RhB dye using UV simulated sunlight on ceria based TiO2nanomaterials for antibacterial applications.
abstract: To photo-catalytically degrade RhB dye using solar irradiation, CeO2doped TiO2nanocomposites were synthesized hydrothermally at 700 °C for 9 hrs. All emission spectra showed a prominent band centered at 442 nm that was attributed to oxygen related defects in the CeO2-TiO2nanocrystals. Two sharp absorption bands at 1418 cm-1and 3323 cm-1were attributed to the deformation and stretching vibration, and bending vibration of the OH group of water physisorbed to TiO2, respectively. The photocatalytic activities of Ce-TiO2nanocrystals were investigated through the degradation of RhB under UV and UV+ visible light over a period of 8 hrs. After 8 hrs, the most intense absorption peak at 579 nm disappeared under the highest photocatalytic activity and 99.89% of RhB degraded under solar irradiation. Visible light-activated TiO2could be prepared from metal-ion incorporation, reduction of TiO2, non-metal doping or sensitizing of TiO2using dyes. Studying the antibacterial activity of Ce-TiO2nanocrystals against E. coli revealed significant activity when 10 μg was used, suggesting that it can be used as an antibacterial agent. Its effectiveness is likely related to its strong oxidation activity and superhydrophilicity. This study also discusses the mechanism of heterogeneous photocatalysis in the presence of TiO2.
authors.affiliation: UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P O Box 392, Pretoria, South Africa.|Nanosciences African network (NANOAFNET), Materials Research Group (MRG), iThemba LABS-National Research Foundation (NRF), 1 Old Faure Road, 7129, P O Box 722, Somerset West, Western Cape Province, South Africa.
authors.forename: Kaviyarasu
authors.initials: K
authors.lastname: Kasinathan
authors.affiliation: UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P O Box 392, Pretoria, South Africa.|National Isotope Centre, GNS Science, PO Box 31312, Lower Hutt 5010, New Zealand.
authors.forename: John
authors.initials: J
authors.lastname: Kennedy
authors.affiliation: UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P O Box 392, Pretoria, South Africa.|Department of Physics, TVUAC, Thennangur, Thiruvalluvar University, Vellore, India.
authors.forename: Manikandan
authors.initials: M
authors.lastname: Elayaperumal
authors.affiliation: UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P O Box 392, Pretoria, South Africa.|School of Physics and Astronomy, The University of Nottingham, University Park, Nottingham, Nottingham NG7 2RD, United Kingdom.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Henini
authors.affiliation: UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P O Box 392, Pretoria, South Africa.|Nanosciences African network (NANOAFNET), Materials Research Group (MRG), iThemba LABS-National Research Foundation (NRF), 1 Old Faure Road, 7129, P O Box 722, Somerset West, Western Cape Province, South Africa.
authors.forename: Maaza
authors.initials: M
authors.lastname: Malik
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000494:pharmacology; D002563:Cerium / Q000737:chemistry / Q000494:pharmacology; D004926:Escherichia coli / Q000254:growth & development*; D053758:Nanoparticles / Q000737:chemistry*; D055668:Photochemical Processes; D012235:Rhodamines / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry / Q000494:pharmacology; D014466:Ultraviolet Rays
chemical_list: D000900:Anti-Bacterial Agents; D012235:Rhodamines; C009495:titanium dioxide; D002563:Cerium; C030583:ceric oxide; D014025:Titanium; C029773:rhodamine B