International Journal of Technology Enhancements and Emerging Engineering Research (ISSN 2347-4289)

IJTEEE >> Volume 3 - Issue 9, September 2015 Edition

International Journal of Technology Enhancements and Emerging Engineering Research  
International Journal of Technology Enhancements and Emerging Engineering Research

Website: http://www.ijteee.org

ISSN 2347-4289

Effects Of Some Operating Parameters On Photocatlytic Activity Of Ag–N Co-Doped Tio2 Nonocomposite Under Visible Irradiation

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Gebretinsae Yeabyo Nigussie, Abi Tadesse Mengesha, Desta Gebremedhin Gebrehiwet



Key words: as-synthesized photocatalyst, photodegradation, Methyl orange, Ag-N/TiO2



ABSTRACT: Ag-N/TiO2 nanoparticles have been prepared from commercial TiO2 (Degussa P-25). The prepared sample was calcined at 400 ºC for 4 hours. The composite was characterized by X-ray diffraction (XRD) analysis was carried out to determine the crystalline phases of the synthesized material, Transmission Electron Microscopy (TEM) used to analyze the size and morphology of nonmaterial, Ultraviolet – Visible Spectroscopy (UV-VIS) to determine the maximum wavelength. The effect of calcination temperature, catalyst loading, initial pH and silver doping on the photocatalytic efficiency of the sample was tested using methyl orange (MO) as a target pollutant. Results shows titanate phase could transform to anatase phase at the calcination temperature higher than 300 ºC and with further increase in the calcination temperature from 700 to 900 ºC, the intensity of rutile phase increased. TEM images of Ag-N/TiO2 nanocomposite were measured and the size of the particles is in the range 10–15 nm. While the absorption edge of the nano-composite was observed at an absorption band of 540 nm. Silver content has an optimum value of 0.5 M for achieving high photocatalytic activity. However, too much silver loading will result in a negative effect and photocatalytic degradation of MO decreases. Ag-N/TiO2- visible photocatalysts achieved the highest photodegradation efficiency with a MO conversion of 87.42% and 84.32% after 180 min of visible and UV irradiation respectively. The effects of pH on the photodegradation efficiency, which include optimum amount of Ag-N/TiO2 (400 mg/L) photocatalyst and fixed concentration of MO (100 ppm) the highest degradation was observed at pH 2.



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