A novel adsorption membrane with excellent physical prop erties was prepared by immobilizing bayberry tannin onto hide collagen fiber mem brane. The equilibrium adsorption capacities of the membrane to Pb（Ⅱ） an d H...A novel adsorption membrane with excellent physical prop erties was prepared by immobilizing bayberry tannin onto hide collagen fiber mem brane. The equilibrium adsorption capacities of the membrane to Pb（Ⅱ） an d Hg（Ⅱ） were 39.9 mg·g-1 and 75.2 mg·g-1 respectively at 303 K when the equilibrium concentrations of Pb（Ⅱ） and Hg（Ⅱ） were 192.1 mg·L-1 and 23.5 mg·L-1.Higher temperature led to higher ad sorption capacity. The adsorption isotherm of Pb（Ⅱ） on the tannin immobi lized membrane could be described by the Langmuir model, however, the isotherms of Hg（Ⅱ） tended to be fitted by the Freundlich model. The data of adsorp tion rate could be well described by the pseudo-second-order rate model. Cont inuous adsorption experiments indicated that multi-layer membranes were efficie nt for the removal of Pb（Ⅱ） and Hg（Ⅱ） from water. The membrane wa s easy to be regenerated by 0.1 mol·L-1 HNO3 after continuous adsorpti on and no considerable change of its adsorption property was observed after adso rption and desorption cycles.展开更多
文摘A novel adsorption membrane with excellent physical prop erties was prepared by immobilizing bayberry tannin onto hide collagen fiber mem brane. The equilibrium adsorption capacities of the membrane to Pb（Ⅱ） an d Hg（Ⅱ） were 39.9 mg·g-1 and 75.2 mg·g-1 respectively at 303 K when the equilibrium concentrations of Pb（Ⅱ） and Hg（Ⅱ） were 192.1 mg·L-1 and 23.5 mg·L-1.Higher temperature led to higher ad sorption capacity. The adsorption isotherm of Pb（Ⅱ） on the tannin immobi lized membrane could be described by the Langmuir model, however, the isotherms of Hg（Ⅱ） tended to be fitted by the Freundlich model. The data of adsorp tion rate could be well described by the pseudo-second-order rate model. Cont inuous adsorption experiments indicated that multi-layer membranes were efficie nt for the removal of Pb（Ⅱ） and Hg（Ⅱ） from water. The membrane wa s easy to be regenerated by 0.1 mol·L-1 HNO3 after continuous adsorpti on and no considerable change of its adsorption property was observed after adso rption and desorption cycles.
