title: Synthesis and characterization of titania nanorods from ilmenite for photocatalytic annihilation of E. coli.
abstract: Titania nanorod structures have been obtained by thermal plasma reduction of ilmenite (FeTiO₃) followed by chemical treatments. Inherently present iron in the titania nanorods acts as a dopant which results in shifting the absorption edge of titania from ultraviolet to visible region. X-ray diffraction (XRD) study confirms the existence of rutile phase of titania. X-ray Photoelectron Spectroscopy (XPS) reveals the presence of Ti(4+), O(2-), Fe(3+) and surface hydroxyl group. Transmission Electron Microscopy (TEM) confirms the formation of nanorod structure having width of 6 nm and length of 32 nm. Photocatalytic annihilation property of titania nanorods derived from ilmenite (titania-I), rutile titania obtained from titanium(IV) butoxide (titania-A) and Degussa P25 titania was studied under UV and UV-Visible irradiation conditions separately and compared. The time required for complete photocatalytic annihilation of Escherichiacoli cells are 10, 15 and 45 min under UV irradiation whereas it has taken 15, 10-15, 30 min under UV-Visible irradiation for titania-A, Degussa P25 titania and titania-I respectively. It is observed that titania-I shows significantly stronger antibacterial property under UV-Visible irradiation compared to UV alone.
authors.affiliation: Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhawan, 2 Rafi Marg, New Delhi 110 001, India.
authors.forename: Diptipriya
authors.initials: D
authors.lastname: Sethi
authors.affiliation: CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751 013, India.
authors.forename: Naresh
authors.initials: N
authors.lastname: Jada
authors.affiliation: CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751 013, India.
authors.forename: Rohit
authors.initials: R
authors.lastname: Kumar
authors.affiliation: CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751 013, India. Electronic address: velsak_r@yahoo.com.
authors.forename: Sakthivel
authors.initials: S
authors.lastname: Ramasamy
authors.affiliation: CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751 013, India.
authors.forename: Sony
authors.initials: S
authors.lastname: Pandey
authors.affiliation: CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751 013, India.
authors.forename: Trupti
authors.initials: T
authors.lastname: Das
authors.affiliation: CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751 013, India.
authors.forename: Jayasankar
authors.initials: J
authors.lastname: Kalidoss
authors.affiliation: CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751 013, India.
authors.forename: Partha Sarathi
authors.initials: PS
authors.lastname: Mukherjee
authors.affiliation: CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751 013, India.
authors.forename: Ashish
authors.initials: A
authors.lastname: Tiwari
mesh_terms: D002384:Catalysis; D004926:Escherichia coli / Q000187:drug effects* / Q000528:radiation effects; D007501:Iron / Q000737:chemistry*; D008027:Light; D043942:Nanotubes / Q000737:chemistry* / Q000633:toxicity / Q000648:ultrastructure; D010316:Particle Size; D056951:Photoelectron Spectroscopy; D017550:Spectroscopy, Fourier Transform Infrared; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014961:X-Ray Diffraction
chemical_list: C029232:ilmenite; C009495:titanium dioxide; D014025:Titanium; D007501:Iron
keywords: Absorption edge; Antibacterial property; Degussa P25 titania; Ilmenite; Titania nanorods; Titania rich slag; Transmission electron microscopy