Electrostatic Spinning Of Nanofibers Grafting Modification Of Membrane And Membrane Adsorption Applications

In recent years, the heavy metal pollution accidents occur frequently, which cause serious damage to human health and destroy the ecological environment. So how to effectively remove heavy metals in water becomes a hot and difficult in today's researchers.Traditional method to remove heavy metal with electrochemical method, chemical method, adsorption and membrane separation, adsorption method is recognized as a simple, effective and economic way.Electrostatic spinning of nanofibers with large surface area, higher porosity characteristic merits researchers widely applied to the study of adsorption of heavy metal pollution, and achieved good results.The main content and the main conclusions of this paper studies are as follows:1.Using the electrostatic spinning technology successfully spun out of nano cellulose acetate (CA) fiber membrane and the single factor of CA quality score, acetone and N, N-dimethyl allyl amine mass ratio, voltage, receiving distance was investigated, which effected on fiber morphology and diameter. Characterized by SEM, the best conditions were as followed:CA mass fraction was 17%, acetone- 10-channel DMAC quality ratio of 2:1, voltage was 10 kV and receiving distance of 15 cm.2. Chemical grafting modification method for CA membrane surface grafted with acrylic acid,then researched The effects of graft-modified optimum conditions, test and analysis of the grafted membrane Hg2+, Cu2+ adsorption effect, adsorption and adsorption kinetics model. The experimental result showed that the fiber membrane of the two kinds of heavy metals had certain absorption capacity, and better than the Cu2+ adsorption capability for Hg2+.Fiber membrane adsorption Hg2+ and Cu2+ model were Freundlich; Fiber membrane adsorption Cu2+ fit in conformity with the first order kinetics, adsorption Hg2+ fit secondary dynamics.3.Using the electrostatic spinning technology successfully blended the acetate fiber and resin nano fiber membrane, explored the rosin and acetate fiber quality ratio on the fiber morphology. Then by using scanning electron microscopy (SEM), infrared spectrum, such as means of characterization, the results showed that fiber membrane thickness uniformity,smooth surface,at about 500 nm diameter distribution, good three-dimensional topography.4.Studied the CA with rosin blended membrane adsorption Cd2+, Cu2+and Pb2+, test results showed that the cellulose fiber membrane adsorption capability for heavy metals Cd2+, Cu2+ and Pb2+ had certain adsorption capacity, adsorption capacity was greater than the Cu2+ adsorption for Pb2+ was greater than the amount of adsorption Cd2+. With the metal concentration increased, when the concentration reached a certain value, the adsorption capacity did not increase, were up to 19.75mg/g 10.58mg/g and 5.03mg/g, reached the maximum adsorption saturation at this time,Reached the maximum adsorption saturation, at this time and respectively explored the fiber membrane adsorption model fitting method, the experimental results on the surface of fiber membrane adsorption Cd2+,Cu2+ and Pb2+ model were Freundlich. Of fiber membrane adsorption Cd2+, Cu2+ and Pb2+ dynamics for fitting, the experiment results showed that the adsorption of Cu2+ and Pb2+ fitt first order kinetics, adsorption Pb2+ fit secondary dynamics.