Publisher: Chemical Society of Nigeria

Solar Photocatalytic Degradation of Acid Blue 29

A. Giwa, P. O. Nkeonye, K. A. Bello, E. G. Kolawole
KEYWORDS: SOLAR PHOTOCATALYTIC DEGRADATION OF ACID BLUE 29

ABSTRACT:

The photocatalytic activity of commercial ZnO powder and Degussa P25 TiO2 has been investigated under laboratory experiments with acid blue 29 as the model pollutant. Solar light was used as the energy source for the photocatalytic experiments. The effect of initial dye concentration, catalyst loading, irradiation time and pH, were studied. The progress of photocatalytic degradation of the acid blue 29 has been observed by monitoring the change in substrate concentration of the model compound employing HPLC and measuring the absorbance in UV–Visible spectrophotometer for decolourisation. The photodegradation rate was determined for each experiment and the highest values were observed for ZnO suggesting that it absorbs large fraction of the solar spectrum and absorption of more light quanta than TiO2. The complete mineralisation was confirmed by total organic carbon (TOC) analysis and COD measurement.


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