Photocatalytic degradation of Orange G dye under solar light using nanocrystalline semiconductor metal oxide.

Environmental Science and Pollution Research International
G ThennarasuA Sivasamy

Abstract

The photocatalytic degradation of Orange G (OG) dye has been investigated using synthesised nanocrystalline ZnO as a photocatalyst and sunlight as the irradiation source. The formation of ZnO prepared from its precursor was confirmed through FT-IR and powder X-ray diffraction analyses. Surface morphology was characterised by scanning electron microscope and transmission electron microscope analysis. Band gap energy of synthesised nanocrystalline ZnO was calculated using diffuse reflectance spectroscopy (DRS). Different experimental parameters such as effects of pH, dye concentrations and mass of catalyst were standardised in order to achieve complete degradation of the dye molecules under solar light irradiation. The kinetics of oxidation of OG was also studied. The complete degradation of OG was evident after 90 min of irradiation at an initial pH of 6.86. The degradation of OG was confirmed by UV-Visible spectrophotometer, high-pressure liquid chromatography, ESI-Mass and chemical oxygen demand analyses. The adsorption of dye onto catalytic surface was analysed employing model equations such as Langmuir and Freundlich isotherms, and it was found that the Langmuir isotherm model best fitted the adsorption data. The solar photo...Continue Reading

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Citations

Oct 11, 2017·Environmental Science and Pollution Research International·Biplab SarkarSurajit Bhattacharjee
Apr 27, 2019·Environmental Science and Pollution Research International·Chaiyos ChankaewApinpus Rujiwatra
May 23, 2013·Physical Chemistry Chemical Physics : PCCP·A LeelavathiN Ravishankar

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