Volume 7, Issue 1, July 2014, Pages 174–185
Tesfaye Teka1 and Abi Tadesse2
1 Chemistry, Adigrat University P.O. Box 50, Adigrat, Ethiopia
2 Haramaya University Department of Chemistry, P.O. Box 138, Dire dawa, Ethiopia
Original language: English
Copyright © 2014 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Crystal form of N-TiO2/WO3 Nano-Composite material was prepared from urea, commercial TiO2 and WO3 by simple solid phase reaction followed by calcination at a temperature of 400 0C for four hours at each step. The as-synthesized photocatalyst was characterized using XRD and Uv-Visible diffuse reflectance spectra. It was found that the absorption edge of N-TiO2/WO3 was well extended to visible light. The effect of catalyst loading and initial pH on the photocatalytic efficiency of the sample was tested using phenol red as a target pollutant. The photocatalytic degradation efficiency of the catalyst for the adsorbed phenol red was increased from 61.75-93.87% under visible and 48.01-75.74% under UV as the amount of the catalyst increase from 0.15 to 0.45 gram. Further increase in concentration was found to decrease the degradation efficiency. The photocatalytic degradation efficiency of adsorbed phenol red was increased from 55.88-95.23%, under visible and 44.18 -77.32%, under UV as the pH of the solution decreased from 5 to 3. But further decrease in pH was found to decrease the degradation efficiency. The assynthesized photocatalyst was highly efficient under visible irradiation than under UV irradiations.
Author Keywords: Advanced oxidation processes, Catalyst loading, Operational-parameters, Photocatalysis, pH of solution.
Tesfaye Teka1 and Abi Tadesse2
1 Chemistry, Adigrat University P.O. Box 50, Adigrat, Ethiopia
2 Haramaya University Department of Chemistry, P.O. Box 138, Dire dawa, Ethiopia
Original language: English
Copyright © 2014 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Crystal form of N-TiO2/WO3 Nano-Composite material was prepared from urea, commercial TiO2 and WO3 by simple solid phase reaction followed by calcination at a temperature of 400 0C for four hours at each step. The as-synthesized photocatalyst was characterized using XRD and Uv-Visible diffuse reflectance spectra. It was found that the absorption edge of N-TiO2/WO3 was well extended to visible light. The effect of catalyst loading and initial pH on the photocatalytic efficiency of the sample was tested using phenol red as a target pollutant. The photocatalytic degradation efficiency of the catalyst for the adsorbed phenol red was increased from 61.75-93.87% under visible and 48.01-75.74% under UV as the amount of the catalyst increase from 0.15 to 0.45 gram. Further increase in concentration was found to decrease the degradation efficiency. The photocatalytic degradation efficiency of adsorbed phenol red was increased from 55.88-95.23%, under visible and 44.18 -77.32%, under UV as the pH of the solution decreased from 5 to 3. But further decrease in pH was found to decrease the degradation efficiency. The assynthesized photocatalyst was highly efficient under visible irradiation than under UV irradiations.
Author Keywords: Advanced oxidation processes, Catalyst loading, Operational-parameters, Photocatalysis, pH of solution.
How to Cite this Article
Tesfaye Teka and Abi Tadesse, “Effect of Selected Operating Parameters on the Photocatalytic Efficiency of Nitrogen-Doped TiO2/WO3 Nano-Composite Material for Photodegradation of Phenol Red in Aqueous Solution,” International Journal of Innovation and Applied Studies, vol. 7, no. 1, pp. 174–185, July 2014.
