One-step fabrication of β-cyclodextrin modified magnetic graphene oxide nanohybrids for adsorption of Pb(Ⅱ), Cu(Ⅱ) and methylene blue in aqueous solutions

摘要

In this study, using graphene oxide (GO) as carrier, ferrous sulfate heptahydrate (FeSO4 center dot 7H(2)O) and ferric chloride hexahydrate (FeCl3 center dot 6H(2)O) as iron sources, sodium hydroxide (NaOH) as precipitant, beta-cyclodextrin (5CD) as a modifier, beta-cyclodextrin modified magnetic graphene oxide (beta-CD/MGO) nanohybrids were fabricated by a simple one-step reverse phase co-precipitation method. The as-prepared beta-CD/MGO nanohybrids were characterized by transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), N-2 adsorption/desorption isotherm, X-ray photoelectron spectroscopy (XPS) and Zeta potential analysis. Simultaneously, the adsorption properties of the beta-CD/MGO nanohybrids for Pb(II), Cu(II) heavy metal ions and methylene blue (MB) in single aqueous solution were explored by batch experiments. The results revealed that the beta-CD/MGO nanohybrids with high superparamagnetism were successfully fabricated, the maximum adsorption capacities of beta-CD/MGO nanohybrids for Pb(II), Cu(II) and MB were 279.21, 51.29 and 93.97 mg.g(-1) at 298 K, respectively. The adsorption process could be better fitted by pseudo-second-order model and Langmuir model.