Preparation and adsorbability of magnetic composites based on cellulose nanofiber/graphene oxide

In this study, a magnetic composite (Fe3O4@SiO2-APTES/GO/CNF) possessed three-dimensional network was prepared by electrostatic self-assembly method based on cellulose nanofiber (CNF)/graphene oxide (GO). The adsorption properties and mechanism of Fe3O4@SiO2-APTES/GO/CNF for methylene blue (MB) were investi-gated. The experimental results show that the composite material has an obvious three-dimensional network and can be quickly collected under the attraction of external magnets. When the mass ratio of CNF, GO, and Fe3O4@SiO2-APTES is 7: 3.5: 1, the adsorption effect of MB is optimal. Langmuir isothermal adsorption model and pseudo-second-order kinetic model can well describe the adsorption process of MB on the composites, the maximum adsorption capacity is up to 1447 mg g(-1). It is satisfactory that the adsorption capacity for MB remains 83.53% of the original adsorbent after five cycles. The good adsorption and cyclic performance endow it with a broad application prospect in dye wastewater treatment.

Automated summary

In this study, a magnetic composite with a three-dimensional network structure was prepared using an electrostatic self-assembly method. The composite exhibited excellent adsorption properties for methylene blue, with a high adsorption capacity and good cyclic performance. It holds great potential for application in dye wastewater treatment.