▎ 摘　　要

In this study a biocompatible nanocomposite made of iron-oxide@zinc-oxide core@shell nanoparticles on graphene-oxide grafted with PCA (poly-citric acid), GO-g-PCA/Fe3O4@ZnO, with different amounts of grapheneoxide was successfully synthesized by hydrothermal method. We examine its magnetic properties and evaluate its improved electron-hole pair generation capability, thus its charge carrier transport. In order to investigate crystalline structure, particle size, morphology and saturation magnetization, different characterization techniques have been used: XRD, FESEM, TEM, BET and VSM. The size of spherical core@shell nanoparticles is estimated similar to 17.8 nm by FESEM and XRD. Degradation of methylene blue under UV light irradiation has been monitored in order to investigate photocatalytic activity of nanocomposites. The highest degradation rate obtained is similar to 93% in PCA/wt%0.02GO-Fe3O4@ZnO, a quaternary nanocomposite with the highest amount of graphene-oxide among other prepared samples. The synthesized magnetic nano-adsorbent quaternary nano-composites are very efficient, reusable and magnetically recoverable.