synthesis of barium peroxide nanoparticles by h2o2/oil reverse microemulsion method and their photocatalytic decolorization properties

In this research, barium peroxide nanoparticles (bao2 nps), were synthesized by h2o2/organic reverse microemulsion method. characterization of bao2 nps was performed by ft-ir and xrd analyses. in the ft-ir analysis, the peak at 1460 1/cm was characteristic of peroxide compounds. in the xrd spectrum, the similarity of the peak pattern confirmed that the synthesized sample is barium peroxide. the average particle size of bao2 nps was determined to be between 40 and 80 nm based on the analysis of sem images. next, the photocatalytic decolorization of bao2 nps was evaluated by methylene blue (mb) aqueous solutions. the results showed that the nanoparticles had better decolorization performance at acidic ph than at alkaline ph. the decolorization of methylene blue solutions with two different concentrations of 0.005 and 0.01 m nanoparticles was evaluated at different times. the results showed that in the early times, a larger amount of nanoparticles led to more photo-decolorization, but as time increased, the difference in photo-decolorization between the two different amounts of nanoparticles decreased, and in 35 minutes, it became almost the same and equal to 90 %. finally, a mechanism causing the generation of different active species by barium peroxide nanoparticles for photo-decolorization was proposed.