The photocatalytic decolorizing of Remazol Black B (RBB) has been performed in the presence of ZnO suspension and the momentum of the reaction was eagle-eyed spectrophotometrically. The impact of various operating parameters such as amount of photocatalyst, the effect of addition of transition metal ions (Fe3+, Co2+, Pb2+ and Ni2+ ions from Fe(NO3)3.9H2O, Co(NO3)2.6H2O, Pb(NO3)2 and Ni(NO3)2.6H2O salt precursors, respectively), concentration variations of Co2+ and Fe3+ ions, has been enquired. It was observed that trace quantities of Co2+ and Fe3+ ions boost the reaction rate to some extent. The augmentation in the photocatalytic activity might be due to halt the recombination of electron-hole pairs by trapping photogenerated electrons because of incorporation of these metal ions on the semiconductor surface. On the other hand, the addition of Pb2+ and Ni2+ ions in aqueous medium impede photodegradation efficiency by blocking the active sites.
Keywords: Photocatalyst; Solar Light; Transition Metal; Remazol Black B;
