Graphene oxide-Fe3O4 nanocomposite used as aniline adsorbent with a wide pH range

In this paper, the graphene oxide-Fe3O4 nanocomposite was prepared by introducing Fe(3)O(4 )and silane coupling agent containing sulfonic acid groups on the surface of GO. The morphology and structure of nanocomposites were characterized by a series of equipments, and the property of s-GO-Fe3O4 as aniline adsorbent was studied. The Fe3O4 particle is introduced to add magnetic property to GO magnetism and can eliminate the agglomeration of GO sheets. The addition of sulfonic groups improved the dispersion of nanocomposite and eliminated electrostatic repulsion. Thus, the nanocomposite shows high aniline adsorption capacity in a wide pH region and does not show high correlation with pH value. In addition, FTIR and XPS spectrum analyses showed that the adsorption of aniline by s-GO-Fe3O4 is the combined effects of pi-pi interaction, acid-base reaction, and hydrogen bonds. Furthermore, the adsorption of aniline of this nanocomposite follows the pseudosecond-order kinetic model and Freundlich isotherm model. Thus, s-GO-Fe3O4 is a promising nanosorbent for aniline removal from organic wastewater.

Automated summary

In this study, a graphene oxide-Fe3O4 nanocomposite with high aniline adsorption capacity was successfully prepared. The adsorption of aniline by s-GO-Fe3O4 involves a combination of pi-pi interaction, acid-base reaction, and hydrogen bonds. The nanocomposite follows the pseudosecond-order kinetics model and Freundlich isotherm model during the adsorption of aniline.