Synthesis of Graphene Oxide Modified Magnetic Chitosan Having Skin-Like Morphology for Methylene Blue Adsorption

In this work, a novel magnetic biomass adsorbent was synthesized by a simple method. The adsorbent prepared from chitosan, graphene oxide and CoFe2O4 with a ‘skin-like’ morphology had a strong adsorption capacity for methylene blue adsorption and was easily separated from the liquid. The synthesized samples were characterized by scanning electron microscope, energy dispersive spectroscopy, fourier transform infrared spectroscopy and X-ray diffractomer. The adsorption capacity of the adsorbent was evaluated. The various factors affecting the adsorption performance were explored. Meanwhile, the adsorption process was simulated by five kinetic models and four isotherm models. The adsorption process was well described by the Pseudo-second-order kinetic model and the Freundlich isotherm model. ΔG < 0, ΔH < 0 and ΔS < 0 indicate that the adsorption process was a spontaneous, exothermic and randomness decrease process. The adsorbents loaded with methylene blue could be desorbed by soaking in dilute hydrochloric acid. The adsorption–desorption cycle experimental results showed that the adsorbent had good reusability performance.