Preparation of Sodium Alginate-Polyvinyl Alcohol-Polyethylene Glycol Composite Membrane and Its Adsorption Capacity for Cu2+
Sodium alginate (SA) was modified using polyvinyl alcohol (PVA) and polyethylene glycol (PEG) to prepare a novel highly-effective SA-PVA-PEG composite membrane.The adsorption capability of the membrane for Cu2+ was studied.The membrane was characterized by IR and SEM,and the results show that there are many holes inside the membrane,which are favorable to adsorb Cu2+.The experimental results show that:Under the optimum conditions of initial Cu2+ mass concentration 50 mg/L,membrane dosage 1 g/L,wastewater pH 5,adsorption temperature 30 ℃ and adsorption time 60 min,the highest adsorption efficiency can reach 90.1%,the adsorption capacity can reach 25.3 mg/g; The dynamic process of Cu2+ adsorption on the composite membrane can be fitted by the second-order kinetics equation and Elovice equation,and the adsorption process accords with the Langmuir isotherm model.The adsorbed composite membrane can be desorbed using HC1 solution with 1 mol/L of concentration,and when the desorption time is 2 min,the desorption rate can reach 80.0%.