▎ 摘　　要

A response surface modelling methodology was employed in this study to evaluate the effect of four different parameters for the removal of levofloxacin using graphene nanoplatelets. A quadratic statistical model was chosen to represent the process mathematically via an experimental design method. Analysis of variance showed that the mathematical model is in good agreement with the experimental data. The numerical optimization was performed to find the optimum values of process variables which were: contact time = 77 min, adsorbent dosage = 2.1 g L-1, pH = 5.1 and initial concentration of levofloxacin = 10.7 mg L-1. Adsorption experiments were conducted using these optimum parameters and the experimental data were fitted to different isotherms and kinetic models to study the behaviour of the adsorption process. It was observed that the adsorption of levofloxacin on graphene nanoplatelets follows Langmuir isotherm model (R-2 = 0.996 and K-L = 1.188 L mg(-1)) and pseudo-second-order kinetics (R-2 = 0.999 and k(2) = 0.1407 g mg(-1) min(-1)). Thermodynamic properties were calculated through Sips equation, which indicated that the adsorption process is endothermic in nature.