Adsorption/desorption performance of cellulose membrane for Pb(ii)

Abstract

Abstract Cellulose membrane (CM) was successfully prepared by phase conversion (L–S). The adsorption performance of CM for Pb(ii) under different adsorption conditions was investigated, and the adsorption isothermal models and kinetic models were established. Additionally, desorption performance of CM for Pb(ii) under different conditions were also investigated. Scanning electron microscope (SEM), energy dispersion spectroscopy (EDS), and Fourier transform infrared (FT-IR) methods were used to evaluate changes in the microstructure, element content, and functional groups of CM. The maximum adsorption capacity (343 mg·g−1) of Pb(ii) was achieved (initial concentration of Pb(ii) solution was 1,200 mg·L−1, pH was 4.5, adsorption time was 120 min, adsorption temperature was 30°C). Meanwhile, the process conforms to multi-molecular layer chemical adsorption. The desorption results showed that the maximum desorption capacity was 90.00 mg·g−1 (HNO3 concentration was 0.04 mol·L−1, desorption time was 120 min, desorption temperature was 60°C). SEM showed that the pores were saturated after adsorption of Pb(ii). Mapping and EDS analysis revealed that CM contained 72.14% Pb(ii) after adsorption. In the FT-IR curve, Pb(ii) chelated the C═O group of the CM. This method showed great potential for adsorption of Pb(ii) from aqueous solutions.