Synthesis of amino acid functionalized Fe3O4 nanoparticles for adsorptive removal of Rhodamine B

Abstract

Abstract L-Aspartic acid (L-Asp) functionalized magnetite nanoparticles (Fe 3 O 4 NPs) were synthesized through a facile co-precipitation method using L-Asp as a capping agent. UV–Vis, FTIR, XRD, SEM, EDS, TEM, and VSM techniques were used to investigate the formation, morphology, elemental composition, and magnetic properties of the synthesized Fe 3 O 4 NPs. Highly crystalline and spherical shaped pure phase Fe 3 O 4 NPs were successfully synthesized using amino acid as a capping agent. The magnetic measurement analysis confirms the superparamagnetic nature of the synthesized L-Asp capped Fe 3 O 4 NPs. The adsorption efficiency of L-Asp capped Fe 3 O 4 NPs was assessed by the removal of Rhodamine B (RhB). The optimum removal efficiency was found to be 7.7 mg g −1 using 1 mg mL −1 adsorbent, and 30 mg L −1 RhB at pH 7 and 25 °C. The regression ( R 2 adj ) and standard deviation (SD) analysis were used to validate both kinetic and isotherm models. Avrami fractional-order and Liu models were selected as the best kinetic and isotherms, respectively. The maximum adsorption capacity ( Q o ) of L-Asp Fe 3 O 4 NPs toward RhB Liu’s model was found to be 10.44 mg g −1 .