▎ 摘　　要

In this study graphene oxide (GO) reinforced polyvinyl alcohol (PVA) composite hydrogels were synthesized and used as efficient adsorbent for Drimarene Brilliant Blue. GO nanoparticles (NPs) were synthesized by modified Hummer's method. The composites were characterized by Fourier transform infrared spectroscopy (FT-IR), Thermo-gravimetric analysis (TGA), Dynamic Mechanical Analysis (DMA), Scanning electron microscopy (SEM) and X-ray diffraction (XRD). Thermal and mechanical stability of the composites was significantly enhanced by the addition of graphene oxide nanoparticles. The synthesized composites were used for the removal of Drimarene Brilliant Blue from model waste water. The effect of pH, content of GONPs and initial concentration of Drimarene Brilliant Blue on the adsorption capacity of synthesized GO/PVA composites were investigated. The equilibrium isothermal data were studied by applying Langmuir and Freundlich isotherm models. Results demonstrated that the adsorption process is well described by the Langmuir adsorption isotherm and maximum adsorption capacity i.e. 32 mg/g was obtained at 0.7% GO/PVA composite. From the adsorption kinetics study it was concluded that pseudo-first-order model is the best fitted. Synthesized composites exhibited excellent reusability (almost 95%) for the adsorption of Drimarene Brilliant Blue after four successive cycles of adsorption and desorption. Thus, the GO/PVA composites demonstrated a great potential in terms of cost effectiveness, efficiency and reusability for the removal of Drimarene Brilliant Blue dye.