title: Synthesis and characterisation of potassium polytitanate for photocatalytic degradation of crystal violet.
abstract: Potassium titanate nanostructures were synthesised by hydrothermal treatment of TiO2 (P25) in KOH and H2O2. As-produced powders were characterised by scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, X-ray diffraction, and nitrogen adsorption-desorption methods. Longitudinally-oriented-wire-like structures with a length up to several micrometres and diameters ranging from 10 to 30 nm were obtained. Larger size fibrous nanowires resulting from the hydrothermal treatment showed high affinity in adsorbing crystal violet (CV), which was mainly due to their high surface area. The photocatalytic bleaching of CV solution revealed that the wires are photoactive under ultraviolet light irradiation. Macroporous nanowires are considered as effective adsorbents of CV, capable of photocatalytic degradation, and they can be easily separated from the solution by settling.
authors.affiliation: School of Civil and Environmental Engineering, University of Technology, Sydney (UTS), P.O. Box 123, Broadway, Sydney, NSW 2007, Australia.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Shahid
authors.affiliation: School of Civil and Environmental Engineering, University of Technology, Sydney (UTS), P.O. Box 123, Broadway, Sydney, NSW 2007, Australia.
authors.forename: Ibrahim
authors.initials: I
authors.lastname: El Saliby
authors.affiliation: School of Chemistry and Forensic Science, University of Technology, Sydney (UTS), P.O. Box 123, Broadway, Sydney, NSW 2007, Australia.
authors.forename: Andrew
authors.initials: A
authors.lastname: McDonagh
authors.affiliation: School of Civil and Environmental Engineering, University of Technology, Sydney (UTS), P.O. Box 123, Broadway, Sydney, NSW 2007, Australia.
authors.forename: Leonard D
authors.initials: LD
authors.lastname: Tijing
authors.affiliation: School of Applied Chemical Engineering, The Research Institute for Catalysis, Chonnam National University, Gwangju 500-757, South Korea; Photo & Environmental Technology Co., Ltd., Gwangju 500-460, South Korea.
authors.forename: Jong-Ho
authors.initials: JH
authors.lastname: Kim
authors.affiliation: School of Civil and Environmental Engineering, University of Technology, Sydney (UTS), P.O. Box 123, Broadway, Sydney, NSW 2007, Australia. Electronic address: hokyong.shon-1@uts.edu.au.
authors.forename: Ho Kyong
authors.initials: HK
authors.lastname: Shon
mesh_terms: D000327:Adsorption; D002384:Catalysis; D005840:Gentian Violet / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D011188:Potassium / Q000737:chemistry*; D033362:Powder Diffraction; D013052:Spectrometry, X-Ray Emission; D014025:Titanium / Q000737:chemistry*
chemical_list: D014025:Titanium; D005840:Gentian Violet; D011188:Potassium
keywords: Adsorption; Crystal violet; Macroporous; Photocatalysis; Potassium titanate; Titanium dioxide