Nanocomposites are promising materials for many applications including environmental ones. Herein graphene oxide / zinc oxide nanocomposites were prepared using simple chemical methods and used to purify polluted water samples. Highly dispersed and uniformly decorated GO nano-sheets with ZnO nanoparticles were synthesized and were utilized for water treatment applications. Two factors were investigated: GO treatment time and ZnO NPs content in the nanocomposite and both were found to strongly affect the nanocomposite performance in degrading methylene blue. They were also found to govern the contribution of each nanocomposite constituent, GO and ZnO NPs, in pollutant removal process. Through a proper optimization of these factors, a pollutant degradation efficiency as high as 98 % was achieved. The findings show that the performance of graphene based nanocomposites for water treatment applications can be greatly enhanced by a proper control of their processing conditions and the content of each constituent of the nanocomposite.

纳米复合材料是许多应用（包括环境应用）的有前途的材料。本文使用简单的化学方法制备了氧化石墨烯/氧化锌纳米复合材料，并用于净化污染的水样。合成了具有 ZnO 纳米颗粒的高度分散且均匀装饰的 GO 纳米片，并将其用于水处理应用。研究了两个因素：GO 处理时间和纳米复合材料中 ZnO 纳米粒子的含量，发现这两个因素都会强烈影响纳米复合材料降解亚甲基蓝的性能。还发现它们控制着每种纳米复合材料成分（GO 和 ZnO NP）在污染物去除过程中的贡献。通过对这些因素的适当优化，污染物降解效率高达98%。研究结果表明，通过适当控制其加工条件和纳米复合材料每种成分的含量，可以大大提高用于水处理应用的石墨烯基纳米复合材料的性能。