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Vol. 32 No. 12 (2020): Vol 32 Issue 12, 2020

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Synthesis and Application of Novel Coal Fly Ash Supported C-Doped TiO2-SnO2 Photocatalytic Nanocomposite for the Removal of Dyes in Water

https://doi.org/10.14233/ajchem.2020.22972
S. Sambakanya
Department of Chemistry, University of Fort Hare, P. Bag X1314, Alice, 5700, South Africa
P. Nyamukamba
Department of Chemistry, University of Fort Hare, P. Bag X1314, Alice, 5700, South Africa; Department of Physics, University of Fort Hare, P. Bag X1314, Alice, 5700, South Africa
D.M. Katwire
Department of Chemistry, University of Fort Hare, P. Bag X1314, Alice, 5700, South Africa
H.H. Mungondori
Department of Chemistry, University of Fort Hare, P. Bag X1314, Alice, 5700, South Africa ; Department of Applied Sciences, Walter Sisulu University, PO Box 1421, East London, 5200, South Africa
P. Mukumba
Department of Physics, University of Fort Hare, P. Bag X1314, Alice, 5700, South Africa
O. Okoh
Department of Chemistry, University of Fort Hare, P. Bag X1314, Alice, 5700, South Africa

Corresponding Author(s) : P. Nyamukamba

pnyamukamba@ufh.ac.za

Asian Journal of Chemistry, Vol. 32 No. 12 (2020): Vol 32 Issue 12, 2020

Abstract

Herein, the preparation, characterization and applications of novel carbon doped titanium dioxide and tin oxide nanocomposite supported on coal fly ash (C-TiO2-SnO2/CFA) are reported. The nanocomposite nanoparticles were successfully synthesized by a sol-gel method and calcined at 550 ºC. XRD analysis showed that SnO2 nanoparticles were polycrystalline in nature and TiO2 had both anatase and rutile phases. Diffuse reflectance spectra showed that carbon doping reduced the band gap of TiO2 from 3.19 eV to 2.78 eV. The nanoparticles′ photocatalytic activity was evaluated using methyl orange and methylene blue dyes, under both UV light and solar irradiation at different pH, pollutant concentration and photocatalyst loading. High photodegradation rates of methyl orange were achieved under visible light. The optimum loading of composite photocatalyst was 0.4 g with removal efficiencies of 97.75% for methyl orange and 99.25% for methylene blue after 3 h. High removal efficiencies were achieved for methyl orange at pH 3 and for methylene blue at pH 10.

Keywords

Coal fly ash Doping Nanoparticles Methylene blue Methyl orange Photocatalysis Tin dioxide Titanium dioxide
Sambakanya, S., Nyamukamba, P., Katwire, D., Mungondori, H., Mukumba, P., & Okoh, O. (2020). Synthesis and Application of Novel Coal Fly Ash Supported C-Doped TiO2-SnO2 Photocatalytic Nanocomposite for the Removal of Dyes in Water. Asian Journal of Chemistry, 32(12), 3239–3248. https://doi.org/10.14233/ajchem.2020.22972
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