Systematic Study on Photo Propagated Fenton Degradation of 4-5-Dihydro-5-Oxo-1-(-4-Sulphophenyl)-4-(4-Sulphophenyl)Azo) 1H-Pyrazole-3-Carboxylic Acid

IJEP 43(1): 74-79 : Vol. 43 Issue. 1 (January 2023)

Odinma Stanley Chukwudindu1*, E.C. Okafor2, E.C. Ezeudu3 and K.A. Eze4

1. Caritas University, Department of Industrial Chemistry, Amorji-Nike, Enugu, Nigeria
2. Chukwuemeka Odumegwu Ojukwu University, Department of Pure and Industrial Chemistry, Uli, Nigeria
3. Nnamdi Azikiwe University, Department of Pure and Industrial Chemistry, Awka, Nigeria
4. Enugu State University of Science and Technology, Department of Chemical Engineering, Enugu, Nigeria


The prognostic aspect of the survival of the planet Earth is the cases emerging from environmental issues. Among the pollutants, dyes have become the focus. An idealized situation of photo-initiated/assisted oxidation reaction, which is the basis of all advanced oxidation processes (AOPs) in the presence of an auxiliary oxidant, such as H2O2 is studied. Subsequently, hemolytic cleavage of a chemical bond leads to the formation of primary reactive hydroxyl radicals (oOH). These short leaved radicals were used to degrade the analyte. Response surface methodology was employed to optimize the three basic process parameters (H2O2, Fe2+, pH) that influence the response efficiency. 99.8% removal was achieved at the combining ratio of H2O2:Fe2+:pH (2 mL:8 mg:3) as the best point within 30 min of reaction time. With an increase in Fe2+ dose to 26 mg, the efficiency reduced to 95% which is a result of reduction in reconversion of Fe3+ to Fe2+. 19% was observed in the alkaline medium at H2O2:Fe2+:pH (3.5 mL:17 mg:9.7), this confirmed that more lOH radicals are favoured in acidic environment. From the analysis of variance (ANOVA), the model developed was shown to be significant. Both statistical and experimental validations of the model were verified and found to be in good agreement.


Advanced oxidation reaction, Empirical modelling, Photo-Fenton, Tartrazine azo dye, food dye, Wastewater


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