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Title: Sonophotocatalytic Degradation of Organic Pollutants in Aqueous Solutions Under Visible Light Using Metal Impregnated Photocatalysts
Authors: Khitab, Fatima
Keywords: Chemistry
Issue Date: 2020
Publisher: University of Peshawar, Peshawar.
Abstract: The visible light induced semiconductor photocatalyst Ni impregnated ZnO was prepared by wet impregnation method. Impregnation of Ni on ZnO shifts the band gap from UV to Visible region. The present study involves the sonophotocatalytic degradation of acid violet 49 and acid blue 45 in the presence of photocatalyst Ni-ZnO under the irradiation of visible light. Degradation efficiency of sonophotocatalysis was higher than sonolysis, sonocatalysis, photolysis and photocatalysis. Photocatalyst was characterized by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and X-ray diffraction (XRD). Effect of different operational parameters such as pH, catalyst dosage, different oxidising agents, initial dye concentration, different scavengers, catalyst re-used ability, catalyst settling time and catalytic poisoning. Addition of enhancers increases the degradation efficiency and scavengers decrease the degradation. We found that Acid violet 49 and acid blue 45 degraded 100% at pH 10 in 20 minutes. Catalyst re-usability was checked up to five cycle and it gives a fruitful results. Kinetics study was also carried out and it was found that both of the dyes undergo pseudo first order kinetic model. All the experiments indicate that the sonophotocatalytic degradation method in the presence of Ni-ZnO was an advisable choice for the treatment of textile effluents.
Gov't Doc #: 19776
Appears in Collections:PhD Thesis of All Public / Private Sector Universities / DAIs.

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