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Title Photocatalytic decolourisation of industrial wastewater from a soft drink company
Journal International journal of Engineering And Applied Science
Publisher Faculty of Engineering, Nnamdi Azikiwe University, Awka Nigeria.
Issue 1
ISSN 1119-8109
Pages 11 - 16
Subject Chemical Engineering
Date of Publication April 2014

AUTHOR(S) F.A. Aisien, N.A. Amenaghawon, and E.F. Ekpenisi

ABSTRACT

The photocatalytic decolourisation of industrial wastewater from a soft drink company was investigated. Four catalysts namely titanium dioxide (TiO2), zinc oxide (ZnO), periwinkle shell ash (PSA) and snail shell ash (SSA) were evaluated for their potential use as photocatalysts for decolourisation of wastewater. Two sets of preliminary experiments were carried out, the first without light and the second in the presence of sunlight to determine the best catalyst for the study. Results of preliminary studies showed that PSA was best suited for the decolourisation of the wastewater samples hence it was chosen for further studies. The percent decolourisation was monitored spectrophotometrically by the measurement of absorbance at a wavelength of 201nm. The effect of catalyst dosage and oxidant (H2O2) loading on the degradation process was investigated. The percent decolourisation increased with increase in PSA dosage with a dosage of 12 g/L resulting in the maximum percent decolourisation of 62%. Addition of oxidant enhanced the photodegradation process with almost 100% decolourisation achieved. The degradation process conformed to a pseudo first order reaction and this was appropriately described by the Langmuir-Hinshelwood kinetic model.


Keywords: Photocatalytic decolourisation, wastewater, Periwinkle shell, Snail shell, Langmuir-Hinshelwood model




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