Knitted tube reinforced chitosan/β‐cyclodextrin composite ultrafiltration membrane for removing copper ions from water

Abstract

Abstract Industrial development has brought about serious water pollution problems, and the removal of heavy metals from water to obtain clean water is essential for human survival. Therefore, in this study, a knitted tube reinforced chitosan (CS)/β‐cyclodextrin (CD) composite ultrafiltration membrane was prepared for the removal of Cu 2+ from water by a non‐solvent induced phase separation method, and the membrane forming property of CS was improved by using knitted tubes. The removal of Cu 2+ by the composite ultrafiltration membrane followed the Langmuir isothermal model and the pseudo‐second‐order kinetic equation, mainly through the complexation between the amino group on CS and the hydroxyl group on β‐CD and Cu 2+ . Under static conditions, the removal rate of the prepared ultrafiltration membrane for Cu 2+ was 97%, and the removal rate increased with the increase of pH and decreased with the increase of temperature. The removal of Cu 2+ by the ultrafiltration membrane during filtration was 100% and the regeneration rate was over 95%. This study provided a practical basis for the separation membrane preparation of CS and provided a perspective for the removal of heavy metals by separation membranes.