Abstract
Ethylenediamine functionalized magnetic expanded graphite decorated with Fe3O4 nanoparticles (MEG-NH2) was fabricated by one-pot solvothermal method. The as-prepared MEG-NH2 nanohybrids were characterized by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), and Zeta potential analyzer. The effects of Fe3O4 content in MEG-NH2 nanohybrids, pH, initial concentration, contact time, and dosage on adsorption properties of the MEG-NH2 nanohybrids for Ag(I) from aqueous solution were investigated by batch experiments. The pseudo-first-order and the pseudo-second-order kinetic models were utilized to study adsorption kinetics. The experimental data was also analyzed with Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich isotherm models. The results show that Ag(I) was reduced to silver in the process of the adsorption by MEG-NH2 nanohybrids; the experimental data was better fitted to pseudo-second-order model and Langmuir isotherm model which revealed that the adsorption process was a chemical adsorption by the formation of silver on the surface of MEG-NH2 nanohybrids.
Highlights
In recent years, numerous water bodies such as rivers, lakes, and ponds have accommodated a great deal of waste water composed of industrial and domestic sewage
In this study, using ethylenediamine functionalized magnetic expanded graphite (MEG-NH2) nanohybrids with desirable performance composed of magnetism of Fe3O4, chemical adsorption of amino groups, and unique ion diffusion channels of Expanded graphite (EG) were synthesized by one-pot solvothermal reaction
R = (C0 − C) × 100%, C0 where Q is adsorption capacity of Ag(I) on Magnetic expanded graphite (MEG)-NH2 nanohybrids, R is removal efficiency, C0 and C are initial and outlet concentration of Ag(I) in solution, respectively, V is the volume of the added Ag(I) aqueous solution, and m is dosage of the adsorbent
Summary
Numerous water bodies such as rivers, lakes, and ponds have accommodated a great deal of waste water composed of industrial and domestic sewage. Journal of Nanomaterials modified melamine resins [9], and bioadsorbent [10] It is somewhat difficult for these traditional adsorbents to separate for resource recycling after adsorption. Secondary pollution will never occur, and the recovery and recycling of silver are ready to be realized [13] It is not ideal for pure MEG to be applied to adsorb silver ions owing to lack of appropriate functional groups. These materials mostly need modification to improve their physicochemical properties. In this study, using ethylenediamine functionalized magnetic expanded graphite (MEG-NH2) nanohybrids with desirable performance composed of magnetism of Fe3O4, chemical adsorption of amino groups, and unique ion diffusion channels of EG were synthesized by one-pot solvothermal reaction. Adsorption kinetics and isotherms were studied to ascertain the adsorption process
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