, Volume 17, Issue 3, pp 367-375
Date: 13 Jun 2009

Degradation of basic blue 9 dye by CoS/nanoAlMCM-41 catalyst under visible light irradiation

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Abstract

The photocatalytic degradation of basic blue 9 was investigated in aqueous solution containing CoS/nanoAlMCM-41 photocatalyst under visible light. The catalyst is characterized by X-ray diffraction (XRD), UV–Vis diffused reflectance spectra (UV–Vis DRS) and scanning electron microscopy (SEM) techniques. The effect of CoS, nanoAlMCM-41 support and different weight percentage of CoS over the support on the photocatalytic degradation and influence of parameters such as CoS loading, catalyst a mount, pH and initial concentration of basic blue 9 on degradation are evaluated. CoS/nanoAlMCM-41 composite (17 wt%) is found to be optimum. The degradation reaction follows pseudo-first order kinetics. The effect of dosage of photocatalyst was studied in the range 0.04–1.2 g/L. It was seen that 0.8 g/L of photocatalyst is an optimum value for the dosage of photocatalyst. The degradation efficiency was decreased in dye concentration above 3.2 ppm for basic blue 9 dye. In the best conditions, the degradation efficiency was obtained 0.32 ppm for basic blue 9 dye.