Adsorption of copper and lead ions from solution by PVDF-PEI blend film
ABSTRACT A novel film adsorbent (PVDF-PEI) was prepared by simple blending polyethyleneimine and polyvinylidene fluoride for efficient uptake Cu(II) and Pb(II) from solution. The characterization of PVDF-PEI was investigated by Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy. Moreover, the effect about adsorbent mass, solution pH, salinity, contact time, temperature and initial Cu(II) and Pb(II) concentrations was researched by batch experiments, respectively. The adsorption quantity of Cu(II) and Pb(II) was to 81.3 and 178 mg g –1 from Langmuir model under the solid-liquid ratio was 0.5 g L –1 for 8 h at 303 K. Freundlich model and Koble–Corrigan mode well predicted the adsorption isotherms while pseudo-first-order and Elovich models appropriately described the adsorption kinetic curves. The thermodynamic parameters illustrated that both processes were endothermic and spontaneous reactions with increased entropy. Cu-loaded PVDF-PEI and Pb-loaded PVDF-PEI were better regenerated by using 0.1 mol L –1 HCl and HNO 3 , respectively. The mechanisms were both complexation and ion exchange. Overall, it is referred that PVDF-PEI be promising for eliminating Cu(II) and Pb(II) from wastewater.
危险品化学品经营许可证（带存储）