Zinc oxide-silver composite was prepared by photodeposition process. The composite was treated with different
temperature 373, 573 and 773 Ko. Characterization the catalysts by XRD and FTIR analysis was studied. All the
analysis showed the modification of zinc oxide surface after doping. The XRD analysis showed Ag2O was the only
phase found with ZnO at 373 Ko while Ag metal was formed after heat treatment. Photocatalytic degradation was
tested for all prepared catalyst compared with ZnO. The photocatalytic degradation tested by using congo red dye
and the process was efficient in sun light without focusing and the reaction last 50 minutes of time and loading was
1 gm./L. The sequence of Photocatalytic efficiency was ZnO/Ag 373> ZnO> ZnO/Ag 573 > ZnO/Ag 773.