Research on the uranium ion removal performance of polyethyleneimine/ramie fiber self-supporting membranes

In order to deal with the increasingly serious energy and environmental pollution problems, the treatment of uranium containing wastewater has become an urgent matter. In order to treat uranium containing wastewater efficiently and conveniently, polyethylenimide/ramie fiber self-sustaining membrane (PEI/RAM) was prepared by grafting PEI onto ramie fiber after treatment with low eutic solvent (DES) (choline chloride-oxalic acid system), and was used to remove uranyl ion (\rmUO_2^2 + ) in aqueous solution. The effects of initial concentration of \rmUO_2^2 + , pH value of solution, adsorption time and temperature on the properties of the adsorbent were studied. When the initial concentration of uranyl ion is 20 mg/L and the solution pH is 6, the adsorption equilibrium capacity of uranium reaches 302 mg·g⁻¹. The uranium adsorption process of PEI/RAM is closer to Langmuir model and quasi-second-order kinetic model. In the presence of interfering metal ions (Ca²⁺, K⁺, Mg²⁺, Na⁺), the poly-ethylenimide/ramie fiber self-supported film (PEI/RAM) adsorbent showed good selectivity for uranyl ions, and its adsorption capacity for \rmUO_2^2 + (20 mg/L) was nearly 70 times that of other metal ions (20 mg/L).