In this paper, ZnO/Graphene Oxide (ZnO/GO) is synthesized via ultrasound assisted precipitation method and the effect of power and ultrasound time irradiation is studied on photocatalyst properties. The synthesized samples are used for methylene blue (MB) degradation as an organic water pollutant. Physicochemical properties of the samples are investigated by XRD, FESEM, EDX, BET-BJH, FTIR and DRS techniques. Moreover, pH_pzc of the sample with the best performance is calculated to study the effect of acidity on the photocatalyst efficiency in photocatalytic process. Ultrasound has a positive effect on photocatalyst performance. That is because of its effect on distribution of particles and band gap, but it has no effect on photostability of the nanocomposite. Sonication has modified distribution of particles by enhancing the active sites for oxidation process. Making structural gaps by ultrasound irradiation increases available surface area which has a similar effect on photocatalyst performance. Graphene oxide as electron collector and transporter prevents electron-hole recombination and it can be an acceptable reason for enhancement at photocatalyst performance. Finally, some of operational parameters such as pH, photocatalyst loading and dye concentration are investigated.

本文通过超声辅助沉淀法合成了ZnO /氧化石墨烯（ZnO / GO），研究了功率和超声时间辐照对光催化性能的影响。合成的样品用于作为有机水污染物的亚甲基蓝（MB）降解。通过XRD，FESEM，EDX，BET-BJH，FTIR和DRS技术研究了样品的理化性质。此外，pH _pzc计算出具有最佳性能的样品的最大吸收量，以研究酸度对光催化过程中光催化剂效率的影响。超声波对光催化剂的性能有积极的影响。那是因为它对颗粒的分布和带隙的影响，但是对纳米复合材料的光稳定性没有影响。超声处理通过增强氧化过程的活性位点来改变颗粒的分布。通过超声辐照形成结构间隙会增加可用的表面积，这对光催化剂的性能具有相似的影响。氧化石墨烯作为电子收集器和传输器可防止电子-空穴复合，这可能是提高光催化剂性能的可接受原因。最后，一些操作参数，例如pH，