Abstract
A detailed investigation of photocatalytic degradation of Safranine-O dye has been carried out in the presence of aqueous suspension of ZnO irradiated with visible light in a batch reactor. It was observed that photocatalytic degradation of Safranine-O obeys pseudo-first order reaction according to Langmuir-Hinselwood model. The effects of various probable influencing factors viz. irradiation time, initial dye concentration, catalyst loading, light intensity, presence of H 2 O 2 , K 2 S 2 O 8, Na 2 CO 3 and NaCl on the degradation efficiency were systematically studied. The decotourization and extent of degradation of the dye were determined by UV-Visible spectrophotometer and COD reflux method respectively. COD value approximately dropped to zero with the degrading efficiency being about 100% after 3 h. The complete mineralization was confirmed by COD analysis and probable mechanism for the degradation of Safranine-O is proposed.
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