▎ 摘　　要

In this study, strontium titanium trioxide (SrTiO3) nanoparticles were synthesized and doped onto graphene oxide (GO) based magnetic nanoparticles (MNPs) simply via ultrasound. The newly synthesized GO/MNPs-SrTiO3 magnetic nanocomposite was characterized by using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). As prepared GO/MNPs-SrTiO3 was applied for the removal/adsorption of antibiotics namely tetracycline and cefotaxime from water samples. The effective parameters on the adsorption process including adsorbent dosage (mg), NaCl salt (% w/v), and solution pH were studied and their optimum values were obtained. The GO/MNPs-SrTiO3 nanocomposite showed high adsorption capacities of 65.78 mg g(-1) and 18.21 mg g(-1) toward tetracycline and cefotaxime, respectively. A comparison study of Langmuir, Freundlich and Dubinin-Radushkevich isotherm models along with a kinetic study showed that the adsorption experimental data were well fitted to the Langmuir isotherm (R-2 > 0.996) and pseudo-second-order rate model (R-2 > 0.995). An intra-particle diffusion model demonstrated that the adsorption was not controlled by diffusion process. The thermodynamic studies (+Delta H) of the antibiotics adsorption onto GO/MNPs-SrTiO3 revealed an endothermic nature. However, adsorption isotherms, free energy, kinetic models and thermodynamic studies suggested a monolayer sorption model followed by physisorption process for the selected antibiotics.