Removal of Methylene Blue by synthesized ECD-GO/Fe3O4 composite

In this study, sethylenediamine-beta-cyclodextrin (ECD)-graphene oxide (GO) supermolecules were synthesized using ECD and GO as starting materials. The magnetic nano-adsorbent (ECD-GO/ Fe3O4) was prepared by hydrothermal loading Fe3O4 nanoparticles. Their structures and magnetic properties were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM). The results showed that the mass ratios of ECD, GO and Fe3O4 nanoparticles were about 29.1%, 28.4% and 30.2%, respectively. TEM analysis showed that the ECD was spherical when loaded onto the sheet GO surface, and the diameter of ECD-GO/Fe3O4 was about 60-70 nm. According to VSM test, ECD-GO/Fe3O4 exhibits superparamagnetic properties with a saturation magnetization of 22 emu/g. The adsorbent was used for the removal of methylene blue (MB), and the adsorption process was fitted using adsorption isothermal model and kinetic model. The results show that the Freundlich model and pseudo-first-order model are more suitable to describe the adsorption process of MB on ECDGO/Fe3O4. Among them, the adsorption capacity is 53 mg/g, and after four cycles, the removal efficiency of MB is about 69%. The material has certain stability and durability, and the removal process can be successfully applied to the treatment of wastewater containing MB.