Preparation of alkali-modified amino-functionalized magnetic loofah biochar and its adsorption properties for uranyl ions

Functional magnetic loofah (FMC) was prepared by a chemical graft of magnetic nanoparticles MnFe 2 O 4 onto the loofah (ML) after being pretreated and carbonized by NaOH, and its adsorption properties as adsorbent for uranium-containing wastewater were studied. The results show that the equilibrium adsorption capacity of FMC for uranyl ions is 270.95 mg/g. The adsorption process is spontaneous and exothermic. Langmuir’s isothermal model and the quasi-second order model are both suitable for describing the process of adsorption. The adsorption mechanism shows that the rich oxygen-containing functional groups and amino groups on the surface of FMC bind to U(VI) through complexation, and the MnFe 2 O 4 in FMC reacts with U(VI) to remove U(VI) from the aqueous solution.