Study on adsorption performance of polyethyleneimine amino- modified polyvinylidene fluoride grafting acrylic acid fiber membrane for reactive brilliant red X-3B
CHANG Hui, FAN Wen-juan*
College of Biology & Chemical Engineering, Panzhihua University, Panzhihua 617000, China
Abstract：The acrylic acid (AA) was grafted onto polyvinylidene fluoride (PVDF) via solution polymerization method to prepare the PVDF-g-PAA copolymer. Then PVDF-g-PAA was modified by amination with polyethyleneimine (PEI) to prepare PEI amino-modified PVDF-g-PAA copolymer (PEI-PVDF-g-PAA). Then, PEI-PVDF-g-PAA fiber membrane was prepared by the method of electrostatic spinning. The microscopic morphology of PEI-PVDF-g-PAA fiber membrane was characterized by scanning electron microscope (SEM). The results showed that the diameter of fiber in fiber membrane was 30-50nm, and there were a large number of micropores on the surface. The simulated dye (reactive brilliant red X-3B) in waste water was adsorbed with PEI-PVDF-g-PAA fiber membrane as absorbent material, and its adsorption kinetics, adsorption isotherm model and adsorption thermodynamics were investigated. The results indicated that the adsorption efficiency of PEI-PVDF-g-PAA fiber membrane was much higher than that of pure PVDF fiber membrane and PVDF-g-PAA fiber membrane. The adsorption equilibriumwas reached at 70min under the following conditions: the initial mass concentration of reactive brilliant red X-3B was 150mg/L, pH=1, and the dosage of adsorbent was 0.015g. The equilibrium adsorption capacity was 494.95mg/g. The adsorption process of PEI-PVDF-g-PAA fiber membrane for reactive brilliant red X-3B were in accordance with the pseudo second-order kinetic model and Langmuir isotherm adsorption model, which indicated that the adsorption process belonged to monolayer adsorption based on chemical adsorption. The theoretical equilibrium adsorption capacity and theoretical saturated adsorption capacity was 526.32mg/g and 500.00mg/g, respectively. The results of adsorption thermodynamics implied that the adsorption process of PEI-PVDF-g-PAA fiber membrane for reactive brilliant red X-3B was a spontaneous endothermic reaction, and the entropy value of solid-liquid interface increased in this process.
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