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Modification of Immobilized Titanium Dioxide Nanostructures by Argon Plasma for Photocatalytic Removal of Organic Dyes Publisher Pubmed



Khaledian HR1 ; Zolfaghari P1 ; Elhami V1 ; Aghbolaghy M2 ; Khorram S3 ; Karimi A4 ; Khataee A5, 6
Authors
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Authors Affiliations
  1. 1. Department of Chemical Engineering, Faculty of Chemical and Petroleum Engineering, University of Tabriz, Tabriz, 51666-16471, Iran
  2. 2. Department of Chemical and Biological Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, S7N 5A9, SK, Canada
  3. 3. Research Institute for Applied Physics and Astronomy, University of Tabriz, Tabriz, 51666-16471, Iran
  4. 4. Faculty of Advanced Technologies in Medicine, Iran University of Medical Sciences, Tehran, 14496-14535, Iran
  5. 5. Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, 51666-16471, Iran
  6. 6. Health Promotion Research Center, Iran University of Medical Sciences, Tehran, 14496-14535, Iran

Source: Molecules Published:2019


Abstract

The aim of this study was to modify surface properties of immobilized rutile TiO2 using Argon cold plasma treatment and to evaluate the performance of the catalyst in photocatalytic elimination of synthetic dyes in UV/TiO2/H2O2 process. The surface-modified TiO2 was characterized by XRD, EDX, SEM, UV-DRS and XPS analyses. Response surface methodology was adopted to achieve high catalyst efficiency by evaluating the effect of two main independent cold plasma treatment parameters (exposure time and pressure) on surface modification of the catalyst. The increase of the plasma operation pressure led to higher decolorization percentage, while the increase of plasma exposure time decreased the decolorization efficiency. RSM methodology predicted optimum plasma treatment conditions to be 0.78 Torr and 21 min of exposure time, which resulted in decolorization of 10 mg/L solution of the malachite green solution by 94.94% in 30 min. The plasma treatment decreased the oxygen to titanium ratio and caused oxygen vacancy on the surface of the catalyst, resulting in the superior performance of the plasma-treated catalyst. Pseudo first-order kinetic rate constant for the plasma-treated catalyst was 4.28 and 2.03 times higher than the rate constant for the non-treated photocatalyst in decolorization of aqueous solutions of malachite green and crystal violet, respectively. © 2019 by the authors.
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