Adsorption And Catalytic Properties Of Functional Nanocomposites By Electrospinning And Ordered Self-assembly Methods

Nanomaterial possesses volume effect,quantum size effect,surface effect and macroscopic tunnel effect,so its important applications in electronics,optics,chemical,ceramics biology and medicine,and many other fields have attracted extensive attention.Based on the great potential of nanomaterials,I was devoted to the application of the properties of nanomaterials in the field of environmental protection during my master's period.Therefore,we designed and synthesized two kinds of nanocomposites,namely nanofiber materials prepared by electrospinning and sandwich sandwich nanostructures obtained by self-assembly,and explored the catalytic degradation and dye adsorption properties of these nanocomposites.Homogeneous PVA/PAA/Fe₃O₄ three component composite materials were prepared by electrospinning.After heat treatment,Au nanoparticles were generated in situ,and PVA/PAA/Fe₃O₄@AuNPs composites were obtained.Using SEM,TEM and energy spectrum,we can clearly see that Au nanoparticles are uniformly dispersed on a fibrous filament.After that,the nano film is used to catalyze 4 nitrophenol aqueous solution and 2nitroanilineaqueoussolution.Theexperimentalresultsshowthat PVA/PAA/Fe₃O₄@AuNPs composite has good catalytic stability,and the most important is that it processes very good stability.It can recover by magnetic separation and reuse in the same system.Graphene and its derivatives are easy to agglomeration wich makes the applications of composite is limited,using layer by layer self-assembly method,Fe₃O₄ nanoparticles were insert into the carboxylated graphene oxide nanosheets,thus a 3D sandwiched structure Fe₃O₄-COOH@?PAH/GO-COOH?₂.The nanocomposite was used to adsorb dye molecules in aqueous solution.The experiment showed that the adsorbent was very stable.Moreover,the magnetic Fe₃O₄-COOH@?PAH/GO-COOH?₂ nanocomposites are easily recycled and repeatable,and can be used in water purification for the long-term.