Visible Light Photocatalysis of Ni-Deposited TiO2 Nanotubes for Methyl Orange Degradation in Alkaline Medium


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Mert B. , Yazici B.

ACTA METALLURGICA SINICA-ENGLISH LETTERS, vol.28, no.7, pp.858-865, 2015 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 28 Issue: 7
  • Publication Date: 2015
  • Doi Number: 10.1007/s40195-015-0269-x
  • Title of Journal : ACTA METALLURGICA SINICA-ENGLISH LETTERS
  • Page Numbers: pp.858-865

Abstract

The photocatalysis of TiO2 nanotubes (Ti/TNT) and Ni-deposited TiO2 nanotubes (Ti/TNT-Ni) for methyl orange degradation was investigated. Methyl orange was selected as the model pollutant, and its photocatalytic degradation was determined in 1 mol/L KOH solution. Ti/TNT was produced by anodizing method, and the electrodeposition of nickel on TNT was performed galvanostatically. The characterization of electrodes was performed by scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction analysis. The electrochemical behavior of the electrodes was determined by cyclic voltammetry and electrochemical impedance spectroscopy. The irradiation was applied by visible light source (lambda = 635 nm) for 48 h. UV/vis spectroscopy was used for determination of the concentration of methyl orange. Furthermore, after 48-h irradiation, the solutions were analyzed by Fourier transform infrared spectroscopy. Results showed that the concentration of methyl orange decreased from 100 ppm (10(-6)) to 16 ppm, after 48-h irradiation with the photocatalysis of Ti/TNT-Ni.