TY - JOUR

T1 - Effect of ionic liquid on formation of copolyimide ultrafiltration membranes with improved rejection of La3+

AU - Pulyalina, Alexandra

AU - Grekov, Konstantin

AU - Tataurova, Vera

AU - Senchukova, Anna

AU - Novikov, Alexander

AU - Faykov, Ilya

AU - Polotskaya, Galina

N1 - Pulyalina, A., Grekov, K., Tataurova, V. et al. Effect of ionic liquid on formation of copolyimide ultrafiltration membranes with improved rejection of La3+. Sci Rep 12, 8200 (2022). https://doi.org/10.1038/s41598-022-12377-0

PY - 2022

Y1 - 2022

N2 - Ultrafiltration (UF) as a widely used industrial separation method with optimal selection of membrane materials can be applied to extract rare earth metals from dilute solutions formed during the processing of electronic waste by hydrometallurgical methods. In the present work, promising UF copolyimide membranes were prepared using [hmim][TCB] ionic liquid (IL) co-solvent which can be considered as an environmentally friendly alternative to conventional solvents. The membranes were characterized by ATR-FTIR, TGA, SEM and quantum chemical calculations. A significant difference in morphology of these membranes was revealed by SEM of membrane cross-sections; the P84 membrane has finger-like structure of porous substrate in contrast to spongy structure of substrate for the P84/IL membrane due to a higher dynamic viscosity of the casting solution. The transport parameters were determined in ultrafiltration tests with pure water and an aqueous solution of bovine serum albumin. The addition of ionic liquid to the P84 casting solution increases the performance of the membrane. The rejection capacity was evaluated with respect to La3+ in the form of a lanthanum alizarin complex (LAC) in aqueous acetone solution. The P84 membrane prepared using IL showed a high rejection (98.5%) with respect to LAC, as well as a significant productivity.

AB - Ultrafiltration (UF) as a widely used industrial separation method with optimal selection of membrane materials can be applied to extract rare earth metals from dilute solutions formed during the processing of electronic waste by hydrometallurgical methods. In the present work, promising UF copolyimide membranes were prepared using [hmim][TCB] ionic liquid (IL) co-solvent which can be considered as an environmentally friendly alternative to conventional solvents. The membranes were characterized by ATR-FTIR, TGA, SEM and quantum chemical calculations. A significant difference in morphology of these membranes was revealed by SEM of membrane cross-sections; the P84 membrane has finger-like structure of porous substrate in contrast to spongy structure of substrate for the P84/IL membrane due to a higher dynamic viscosity of the casting solution. The transport parameters were determined in ultrafiltration tests with pure water and an aqueous solution of bovine serum albumin. The addition of ionic liquid to the P84 casting solution increases the performance of the membrane. The rejection capacity was evaluated with respect to La3+ in the form of a lanthanum alizarin complex (LAC) in aqueous acetone solution. The P84 membrane prepared using IL showed a high rejection (98.5%) with respect to LAC, as well as a significant productivity.

KW - Chemistry

KW - Ecology

KW - Green chemistry

KW - Materials science

UR - https://www.nature.com/articles/s41598-022-12377-0

M3 - Article

VL - 12

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

M1 - 8200

ER -