Iranian Journal of

Backgrounds and Objectives: Textile industrial wastewaters are one of the important sources of environmental contaminants. In the recent years, use of advanced oxidation processes, by producing highly active and reactive components such as hydroxyl radicals has been proposed. The aim of this research is photocatalytic degradation of methylene blue dye using the ZnO-nanoparticle with UVA irradiation.

Materials and Methods: photocatalytic degradation of methylene blue color using the ZnO- nanoparticles excited with UVA irradiation. In this research, photocatalytic degradation of methylene blue dye was study using different concentration of ZnO-nanoparticles under UVA irradiation in a batch reactor.

Results: The results of this research show that removal of methylene blue dye has direct correlation with UVA intensity. The best results of dye degradation were reported in concentration of 150 _mg/L ZnO nano-particles and the radiation intensity of 240 µW/cm². Rate of dye removal was decrease with increasing of color concentration. Subsequent of color degradation, the initial COD were decresed by %60.

Conclusion: The photocatalytic degradation process using ZnO nano-particles under UVA irradiation could be remove the methylene blue dye and 60% of COD.