title: Cu-doped TiO(2) nanoparticles for photocatalytic disinfection of bacteria under visible light.
abstract: Two percent Cu-doped TiO(2) nanoparticles were prepared by a modified ammonia-evaporation-induced synthetic method, calcined at 450°C, and characterized by powder X-ray diffraction, energy dispersive X-ray analysis, ESR spectroscopy, scanning electron microscopy, UV-visible diffuse reflectance spectrum, photoluminescence spectroscopy, and electrochemical impedance spectroscopy. Doping shifts the optical absorption edge to the visible region but increases the charge-transfer resistance and decreases the capacitance. Under visible light, the composite nanoparticles very efficiently catalyze the disinfection of Escherichia coli. The prepared oxide is selective in photocatalysis; under UV light, its photocatalytic activity to degrade sunset yellow, rhodamine B, and methylene blue dyes is less than that of the undoped one.
authors.affiliation: Department of Chemistry, Annamalai University, Annamalainagar 608 002, Tamilnadu, India. karunakaranc@rediffmail.com
authors.forename: C
authors.initials: C
authors.lastname: Karunakaran
authors.forename: G
authors.initials: G
authors.lastname: Abiramasundari
authors.forename: P
authors.initials: P
authors.lastname: Gomathisankar
authors.forename: G
authors.initials: G
authors.lastname: Manikandan
authors.forename: V
authors.initials: V
authors.lastname: Anandi
mesh_terms: D000641:Ammonia / Q000737:chemistry; D001391:Azo Compounds / Q000737:chemistry; D002384:Catalysis; D003300:Copper / Q000737:chemistry*; D004926:Escherichia coli / Q000737:chemistry*; D008027:Light; D008751:Methylene Blue / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry*; D010777:Photochemistry; D012235:Rhodamines / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D012235:Rhodamines; C009495:titanium dioxide; D000641:Ammonia; D003300:Copper; D014025:Titanium; C005842:6-hydroxy-5-((p- sulfophenyl)azo)-2-naphthalenesulfonic acid disodium salt; C029773:rhodamine B; D008751:Methylene Blue