▎ 摘　　要

Electrochemical properties of synthesized ferrous ferric oxide QDs based on graphene oxide (GO@Fe3O4) nanocomposite were studied by Cyclic Voltammetry, current-voltage (I-V) and Photolumencence (PL) analysis. Nanocomposite was characterized by using different techniques, e.g., transmission electron microscopy (TEM), X-ray diffraction (XRD) and Zeta potential. The low band gap of fabricated GO@Fe3O4 has been made more activity than GO, new optical properties and efficiency of this composite due to loading of metal oxide NPs on a high specific surface area of GO that improve the charge transfer between the metal oxides and organic molecules. Photoinduced charge transfer was detected with an efficiency of degradation of Rose Bengal dye within a short period that supported by the tripping process using UV-Vis spectroscopy. The electron-hole pair recombination was evidenced by photoluminescence (PL) analysis and I-V technique, where GO@Fe3O4 has low electron transfer with rose Bengal compared to N719 dye. Effective adsorbent for removal of both Lambda insecticide and heavy metal ions such as Cr (III) from aqueous solution. The adsorption rates were described by the pseudo-second-order kinetic model and the experimental data were fitted well.