Enhanced heterogeneous ferrioxalate photo-fenton degradation of reactive orange 4 by solar light |
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| Authors: | K Selvam M Muruganandham M Swaminathan |
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| Affiliation: | Department of Chemistry, Annamalai University, Annamalai Nagar—608 002, India |
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| Abstract: | A combined homogeneous and heterogeneous photocatalytic decolourisation and degradation of a chlorotriazine Reactive azo dye Reactive Orange 4 (RO4) have been carried out using ferrous sulphate/ ferrioxalate with H2O2 and TiO2-P25 particles. Solar/ferrous/H2O2/TiO2-P25 and solar/ferrioxalate/H2O2/TiO2-P25 processes are found to be more efficient than the individual photo-Fenton and solar/TiO2-P25 processes. A comparison of these two processes with UV/ferrous/H2O2/TiO2-P25 and UV/ferrioxalate/H2O2/TiO2-P25 reveals that ferrioxalate is more efficient in solar light whereas ferrous ion is more efficient in UV light. The experimental parameters such as pH, initial H2O2, Fe2+, ferrioxalate and TiO2-P25 concentration strongly influenced the dye removal rate in solar processes. The optimum operating conditions of these two combined processes are reported. |
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| Keywords: | Reactive orange 4 Photo-Fenton Ferrous ion Ferrioxalate H2O2 TiO2-P25 Solar light |
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