醋酸纤维素纳米纤维膜的改性及性能研究

发布时间：2018-01-15 16:06

本文关键词：醋酸纤维素纳米纤维膜的改性及性能研究　出处：《天津工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：静电纺丝是制备纳米纤维最有效的方法之一,静电纺丝纳米纤维具有比表面积大、孔隙率高的优点,在重金属离子吸附领域具有良好的应用前景。采用静电纺丝技术制备醋酸纤维素(CA)纳米纤维膜、氨基化醋酸纤维素纳米纤维膜以及碳纳米管修饰的氨基醋酸纤维素纳米纤维膜。主要工作包括以下部分:(1)醋酸纤维素纳米纤维膜的制备。通过响应面法分析不同因素(溶液浓度、电场强度、挤出速率和接收距离)对纤维直径的影响。(2)氨基化CA纳米纤维膜的制备。将CA纳米纤维利用NaOH的醇溶液进行脱乙酰化处理,然后在碳酸钠催化作用下对其进行反应,制备氨基化CA纳米纤维膜。并利用扫描电子显微镜、红外光谱、X射线光电子能谱等手段表征CA纳米纤维膜的性能。(3)碳纳米管修饰的氨基醋酸纤维素纳米纤维膜。将氨基化醋酸纤维素和碳纳米管在N,N-二环已基碳酰亚胺(DCC)作用后制备碳纳米管修饰的氨基醋酸纤维素纳米纤维,并通过不同的表征方法分析其性能。(4)三种不同的醋酸纤维素纳米纤维膜对Cu2+、Pb2+吸附行为的研究。分析pH值、吸附时间和吸附温度对吸附量的影响。通过等温吸附模型、吸附动力学方程探讨其对Cu2+、Pb2+的吸附行为。结果表明,三种纳米纤维膜对重金属Cu2+、Pb2+的吸附行为与准二级吸附动力学匹配,属于化学吸附;对Cu2+、Pb2+的吸附等温线符合Langmuir方程。
[Abstract]:Electrostatic spinning is one of the most effective methods to prepare nanofibers. Electrostatic spinning nanofibers have the advantages of large specific surface area and high porosity. It has a good application prospect in the field of heavy metal ion adsorption. Cellulose acetate (CA) nanofiber membrane was prepared by electrostatic spinning technology. Cellulose aminoacetate nanofiber membranes and carbon nanotube modified cellulose aminoacetate nanofibers membranes. The main work includes the following parts:. Preparation of cellulose acetate nanofiber membrane. Different factors (concentration of solution) were analyzed by response surface method. The effect of electric field strength, extrusion rate and receiving distance on fiber diameter. (2) preparation of aminated CA nanofibers. CA nanofibers were deacetylated by alcohol solution of NaOH. The amino CA nanofiber membrane was prepared by the reaction of sodium carbonate catalyzed by sodium carbonate. Scanning electron microscope (SEM) and infrared spectroscopy (IR) were used. X-ray photoelectron spectroscopy (XPS) was used to characterize the properties of CA nanofibers. Carbon nanotubes (CNTs) were modified by carbon nanotubes (CNTs). Carbon nanotube modified cellulose acetate nanofibers were prepared by the action of n-dicyclic hexyl carboimide (DCCs). The adsorption behavior of three different cellulose acetate nanofibers to Cu2 Pb2 was studied by different characterization methods. The pH value was also analyzed. The effects of adsorption time and adsorption temperature on adsorption capacity were studied. The adsorption behavior of Cu2 Pb2 was investigated by isothermal adsorption model and adsorption kinetics equation. The adsorption behavior of three kinds of nano-fiber membranes for heavy metal Cu2 Pb2 was matched with the quasi-second-order adsorption kinetics, so it belongs to chemical adsorption. The adsorption isotherm of Cu2 Pb2 accords with Langmuir equation.
【学位授予单位】：天津工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ341.2;TB383.2

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