title: Degradation of organic pollutants by bio-inspired rectangular and hexagonal titanium dioxide nanostructures.
abstract: Dyes are used in textile, printing, leather, pharmaceutical, food and cosmetic industries. Dyes add color and pattern to materials. The presence of even very low concentration of dyes/dyes degradation products in effluent is highly toxic to humans and aquatic organisms. It is important to remove these dye degradation pollutants from the industrial effluents before their disposal. In recent years nanoparticles have been used for the removal of dyes from industrial waste water. Titanium dioxide nanostructures (TiO2NS) were synthesized via a one-step facile green process. The formation of TiO2NS was confirmed by Fourier transform infrared (FTIR) and Raman spectroscopy. Anatase (~76%) and rutile (~24%) phases were present, as determined by X-ray diffraction (XRD) analysis. X-ray photoelectron spectroscopy (XPS) was used to study the surface oxidation states of the TiO2NS. High resolution transmission electron microscopy (HR-TEM) images revealed that the samples had hexagonal and rectangular morphologies, with diameters of ~24-32nm. The TiO2NS were used to evaluate the photocatalytic activities of methylene blue (MB) and malachite green (MG) dyes under UV light and in dark conditions. After 60min of UV irradiation, nearly 71% of the MB and 78% of the MG was decolorized in the presence of as-synthesized TiO2NPs.
authors.affiliation: Department of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea.
authors.forename: T V M
authors.initials: TV
authors.lastname: Sreekanth
authors.affiliation: Department of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea.
authors.forename: Jae-Jin
authors.initials: JJ
authors.lastname: Shim
authors.affiliation: Department of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea. Electronic address: yrlee@yu.ac.kr.
authors.forename: Yong Rok
authors.initials: YR
authors.lastname: Lee
mesh_terms: D004396:Coloring Agents / Q000737:chemistry* / Q000528:radiation effects; D052918:Environmental Restoration and Remediation / Q000379:methods*; D007220:Industrial Waste / Q000517:prevention & control; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010782:Photolysis; D014025:Titanium / Q000737:chemistry / Q000494:pharmacology*; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D004396:Coloring Agents; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D014025:Titanium
keywords: Photodegradation, methylene blue, malachite green; TiO(2) nanostructures; X-ray photoelectron spectroscopy