Chemical precipitation method was used to synthesize pure ZnO and Ba-ZnO nanoparticles. The XRD patterns and SEM topography shows that prepared nanoparticles were wurzite structure. The average particle size of 2% Ba-ZnO (25 to 40 nm) exhibited excellent achievable photo-catalytic degradation of M.O. in the acidic condition (pH 4). It was found that 2% Ba-ZnO shows the highest activity for degradation of methyl orange compare to ZnO.

Keywords: Ba-ZnO Nanoparticles; Xrd Pattern; Sem Topography ; Photo-Catalytic Degradation.