聚乙烯亚胺氨基化改性聚偏氟乙烯接枝丙烯酸纤维膜对活性艳红X-3B的吸附研究  

Study on adsorption performance of polyethyleneimine amino-modified polyvinylidene fluoride grafting acrylic acid fiber membrane for reactive brilliant red X-3B

作　　者：常会[1] 范文娟[1] CHANG Hui;FAN Wen-juan(College of Biology&Chemical Engineering,Panzhihua University,Panzhihua 617000,China)

机构地区：[1]攀枝花学院生物与化学工程学院,四川攀枝花617000

出　　处：《冶金分析》2020年第3期16-24,共9页Metallurgical Analysis

基　　金：四川省教育厅项目(16ZB0472);四川省科技厅项目(2019 YJ 0686);四川省大学生创新创业训练计划项目(201811360024);攀枝花学院博士基金项目(2016-BSJJ10)。

摘　　要：以丙烯酸(AA)为接枝单体,通过溶液聚合法在聚偏氟乙烯(PVDF)上接枝AA,制备出PVDF-g-PAA共聚物,再使用聚乙烯亚胺(PEI)对PVDF-g-PAA进行氨基化改性,制备出PEI氨基化PVDF-g-PAA共聚物(PEI-PVDF-g-PAA),再通过静电纺丝法制备出PEI-PVDF-g-PAA纤维膜。使用扫描电子显微镜对PEI-PVDF-g-PAA纤维膜的微观结构进行表征,结果显示纤维膜中纤维的直径为30~50 nm,表面有丰富的微孔。以PEI-PVDF-g-PAA纤维膜为吸附材料对模拟活性艳红X-3B染料废水进行吸附,并研究其吸附动力学、吸附等温模型和吸附热力学,结果表明:PEI-PVDF-g-PAA纤维膜的吸附效果远远大于纯PVDF纤维膜和PVDF-g-PAA纤维膜。在活性艳红X-3B溶液的初始质量浓度为150 mg/L、pH=1、吸附材料用量为0.015 g时,吸附70 min后达到平衡,平衡吸附量为494.95 mg/g,PEI-PVDF-g-PAA纤维膜对活性艳红X-3B的吸附过程满足拟二级动力学模型和Langmuir吸附等温模型,说明PEI-PVDF-g-PAA纤维膜对活性艳红X-3B的吸附是以化学吸附为主的单分子层吸附,理论平衡吸附量和理论饱和吸附量分别为526.32 mg/g和500.00 mg/g。吸附热力学研究表明,PEI-PVDF-g-PAA纤维膜对活性艳红X-3B的吸附是自发进行的吸热反应,该吸附过程固-液界面的熵值会增加。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 30-50 nm,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 70 min under the following conditions:the initial mass concentration of reactive brilliant red X-3B was 150 mg/L,pH=1,and the dosage of adsorbent was 0.015 g.The equilibrium adsorption capacity was 494.95 mg/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 526.32 mg/g and 500.00 mg/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.

关 键 词：PEI-PVDF-g-PAA纤维膜 活性艳红X-3B 吸附 静电纺丝 

分 类 号：TQ424[化学工程]