Nanosized zinc oxide (nano ZnO) is synthesized using three synthesis procedure namely precipitation, combustion and pyrolytic method. In the precipitation method the raw materials used to prepare nano ZnO is different from other two methods of preparation. This gave three different nano ZnO catalysts of various particle sizes. The prepared catalysts were characterized using XRD, DRS-UV and SEM to elucidate their physico- chemical properties. The efficacies of these synthesised catalysts were tested for the abasement of Congo red dye which is a azo dye. The most common catalyst titanium dioxide and titanium dioxide loaded HY catalysts (1 wt % and 3 wt %) were also tested for the photocatalytic degradation of congo red dye. The pH influence for the dye degradation and recyclability were also studied and the results were discussed.
