Sustainable nanofiltration membranes based on biosourced fully recyclable polyesters and green solvents

•Nanofiltration membranes based-on biosourced polyester.•The biosourced polyester is chemically recyclable which promises a closed-loop approach toward a circular plastic economy.•The implementation of green solvents in membrane fabrication.•The effect of membrane thickness and coagulation bath temperature on membrane morphology and organic solvent nanofiltration.•The membranes exhibited a long-term stability in a continuous filtration over a week with the methanol permeance was stable at 8.6 ± 0.1 L m−2 h−1 bar−1. Herein, we report a new class of biosourced nanofiltration membranes based on chemically recyclable aliphatic polyesters (P(4,5-T6GBL)) and the use of green solvents. Given their chemical recyclability and potential biodegradability, these polyester membranes were designed to have a sustainable lifecycle. The effect of membrane thickness and solvent/non-solvent diffusivity on membrane morphology and organic solvent nanofiltration were investigated. Long-term membrane stability was tested in a continuous crow-flow filtration rig over a week, which exhibited stable methanol permeance at 8.6 ± 0.1 L m−2 h−1 bar−1. The rejection profiles of the pharmaceuticals oleuropein (540 g mol−1) and roxithromycin (837 g mol−1) were also found to be stable at 87% and 100%, respectively. Sustainable lifecycle of biosourced nanofiltration membranes based on chemically recyclable aliphatic polyesters and green solvents. Twitter: @SzekelyGroup [Display omitted]