Potential Application of Periwinkle Shell Ash as Photocatalyst for the Heterogeneous Photocatalytic Decolourisation of Congo Red Dye in Aqueous Solution

Authors

  • Felix Aibuedefe Aisien University of Benin
  • Andrew Nosakhare Amenaghawon University of Benin
  • Gabriel Timi Osayamen University of Benin

DOI:

https://doi.org/10.48317/IMIST.PRSM/morjchem-v3i2.2518

Keywords:

Periwinkle shell ash, Congo red, Kinetics, Isotherm, Equilibrium

Abstract

The potential of locally sourced periwinkle shell ash (PSA) has been explored as an alternative photocatalyst for the photocatalytic decolourisation of Congo red dye. The effect of process parameters such as irradiation time, initial dye concentration, catalyst dosage, pH of the solution and the addition of hydrogen peroxide (H2O2) on the extent of photodegradation was investigated. The optimum values of the process parameters were: irradiation time, 50 minutes; initial dye concentration, 10 mg/L; PSA dosage, 7 g/L and pH, 4. The addition of H2O2 enhanced the photodegradation process with almost 100 percent decolourisation achieved. The adsorption equilibrium was well described by the Langmuir isotherm equation (R2=0.999) indicating mono layer type adsorption while the diffusion mechanism and kinetics of the process were well described by the intra-particle diffusion and Langmuir-Hinshelwood kinetic models with high R2 values of 0.998 and 0.999 respectively.

Author Biographies

Felix Aibuedefe Aisien, University of Benin

Chemical Engineering Department

Professor

Andrew Nosakhare Amenaghawon, University of Benin

Chemical Engineering Department

Lecturer I

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Published

08-03-2015

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Section

Articles