Solar, visible and UV light photocatalytic activity of CoWO sub(4) for the decolourization of methyl orange

The photocatalyst CoWO sub(4) was synthesized by co-precipitation method with slight modification and well characterized by FT-IR, UV-vis diffuse reflectance spectra, X-ray diffraction, AFM and field emission scanning electron microscope techniques. The elemental composition present in the photocata...

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Bibliographic Details
Published in:Desalination and water treatment 2015-06, Vol.54 (11), p.3134-3145
Main Authors: Jothivenkatachalam, Kandasamy, Prabhu, Saravanan, Nithya, Arjunan, Chandra Mohan, Singaravelu, Jeganathan, Kulandaivel
Format: Article
Language:English
Subjects:
Catalysts
Dyes
Field emission
Light irradiation
Photocatalysis
Scanning electron microscopy
Surface chemistry
Titanium dioxide
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Summary:The photocatalyst CoWO sub(4) was synthesized by co-precipitation method with slight modification and well characterized by FT-IR, UV-vis diffuse reflectance spectra, X-ray diffraction, AFM and field emission scanning electron microscope techniques. The elemental composition present in the photocatalyst was confirmed by recording EDX spectrum. The photocatalytic activity of CoWO sub(4) for the decolourization of methyl orange (MO) was investigated under solar, visible and Ultra-Violet (UV) light irradiation. The remarkable photocatalytic decolourization of MO was achieved under solar and visible light irradiation than that of TiO sub(2). The high surface area of 55.0527 m super(2)/g enhances the adsorption of anionic dye MO on the surface of the positively charged catalyst at pH 3 thus increases the photocatalytic activity. Under UV light irradiation, photocatalytic activity increases which may be due to high energy of photons. The essential parameters such as amount of catalyst, dye concentration and initial pH influence the photocatalytic efficiency of CoWO sub(4). The first order rate constant for the decolourization reaction was derived using Langmuir-Hinshelwood kinetic model.
ISSN:1944-3994
1944-3986
DOI:10.1080/19443994.2014.906324