Fabrication and Adsorption Properties of Graphene Oxide Aerogel for Methylene Blue from Aqueous Solution

摘要

Graphene oxide aerogel was fabricated by the vacuum freeze-drying method and characterized with scanning electron microscope (SEM), Nitrogen adsorption-desorption curve and Fourier transform infrared spectroscopy (FTIR). Then, the batch adsorption test of graphene oxide aerogel for methylene blue (MB) from aqueous solution was carried out. The experimental results showed that the developed mesoporous structure and plenty of functional groups formed in the fabricated graphene oxide aerogel. Moreover, the removal rate gradually increased from 58.4% to 99.7% with raising pH from 2.0 to 9.0. Furthermore, the adsorption isotherm was well fitted by Freundlich model and the pseudo-second-order kinetic model could well describe the adsorption process. According to the calculated thermodynamic parameters, the adsorption process was non-spontaneous and endothermic.