Preparation of PVDF-g-PAA-PAMAM membrane for efficient removal of copper ions

摘要

In this work, PVDF-g-PAA-PAMAM membranes were prepared by surface grafting different generation polyamide-amine (PAMAM) onto PVDF-g-PAA membranes. The structures of membranes were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectrometer (EDX), field-emission scanning electron microscopy (SEM) and atomic force microscope (AFM). The adsorption properties of membranes to copper ions were studied, and the results found that PAMAM was successfully grafted onto the surface of PVDF-g-PAA membranes, and their hydrophilicity were significantly improved. The adsorption properties of PVDF-g-PAA-PAMAM membranes to copper ions were effectively improved. The PVDF-g-PAA-G3.0 PAMAM membrane has the best adsorption properties, and the adsorption capacity of copper ion can reach 100.98 mg/g, which was higher than that of pure membrane. At the same time, it can be found from the desorption experiments that the PVDF-g-PAA-PAMAM membrane can be recycled with high adsorption capacity, and the regeneration rate was higher than 90%.