Facile Separation of Cu 2+ from Water by Novel Sandwich NaY Zeolite Adsorptive Membrane.

Polyethersulfone-sulfonated polyethersulfone (PES-SPES)/NaY zeolite/nylon sandwich structure membranes were prepared and used to adsorb Cu²⁺ from water. The adsorption kinetics, adsorption isotherm, dynamic adsorption experiment, and reusability were discussed. The experimental data showed that the Langmuir isotherm model, Dubinin–Radushkevich (D-R) isotherm model, and the pseudo-first-order kinetic model can well represent the adsorption of Cu²⁺ on the membrane, indicating an ion exchange mechanism, with the maximum adsorption capacity of 111.25 mg·g⁻¹. Repeatability experiments show that the sandwich film still has good adsorption performance after five times of adsorption and desorption. The as-prepared membrane showed considerable separation performance in removing Cu²⁺ from aspirin solution, providing a feasible method to remove heavy metals from drugs. [ABSTRACT FROM AUTHOR]