▎ 摘　　要

In view of auspicious adsorption efficiency of nanocomposites (NCs), nanocomposites of graphene oxide (GO) were prepared with Fe3O4 by ultrasonic-assisted co-precipitation procedure and characterized by Fourier Transform Infra-red (FTIR), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) and Energy Dispersive X-Ray (EDX). The GO-Fe3O4 NCs were employed for adsorptive elimination of nitrate (NO3-) and phosphate (PO43-) ions from aqueous medium as a function of pH (1-10), GO-Fe3O4 NCs dose (0.05-0.1 g), contact time (0-1444 min) and ions concentration (10-100 mg L-1). Among kinetic and isotherms models, NO3- and PO43- ions removal followed the pseudo second order and Freundlich isotherm models. The maximum elimination capacity was achived up to 89 and 93 (%) for NO3- and PO43- ions, respectively at optimum operating conditions viz. pH 2, ions inital concentration 100 mg L-1, NCs dose 0.5 g and contact time 120 min. For the optimization of process variables, response surface methodology (RSM) was emplyed. The results revealed that GO-Fe3O4 NCs have promising adsorption capacity for NO3- and PO43- ions and can be employed for the removal of NO3- and PO43- ions from effluents. (C) 2021 Elsevier B.V. All rights reserved.