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Title: Heterogeneous photocatalytic decolourisation of congo red dye in aqueous solution using periwinkle shell ash as photocatalyst
Authors: Amenaghawon, Andrew ,N
Osayamen, T.G
Aisien, F.A
Keywords: Periwinkle shell ash
Congo red,
Issue Date: 2015
Publisher: Moroccan Journal of Chemistry
Series/Report no.: 3;2
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.
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