Preparation And Performance Of PMMA/TiO₂ Nanofibers By Electrospinning

TiO₂ nanoparticles are the most promising environmental photocatalyst,low cost,high photocatalytic activity and excellent light stability.The preparation of TiO₂ by electrospinning method to be nanofiber materials has become one of the research hotspot.It embedded active TiO₂ nanostructures in PMMA,with the advantage of no need of recovery of the nanoparticles after water treatment.First of all,this paper was prepared by electrospinning PMMA fibers,The electrospinng solution concentration,solvent,voltage,solidification distance,advancing speed,humidity were studied,and these factors are the basic parameter of electrospinning process.Secondly,Select the appropriate parameters of electrospinning,PMMA is used as a polymer matrix in the preparation of the nanofibers,the introduction of TiO₂ particles into PMMA,adding a little of anionic dispersing SDBS,in a mixed solvent of DMF and EA?VD:VE=3:1?,these PMMA/R-TiO₂ and PMMA/A-TiO₂ composite nanofibers by electrospinning.In this paper,the obtained composites nanofibers were characterized by SEM?XRD?FTIR ? TG in order to characterize morphologically the nanostructures and their distribution in the polymeric matrix,crystalline properties,chemical structure,thermal properties.The R-TiO₂ and A-TiO₂ content of 5%,the minimum average fiber diameters of 436 nm and 409 nm,the fibers appear smooth and continuous.two kinds of composite fibers have higher porosities.The TG curve showed that PMMA/R-TiO₂ nanofibers residual amount was higher than PMMA/A-TiO₂,which indicated that R-TiO₂ could improve thermal stability of the composites.It evaluated their photocatalytic activity by degradation of some dyes and methyl orange in an aqueous medium.The results showed that with increasing TiO₂ content,the composite nanofibers degradation rate of methyl orange improved.As the same conditions,when the TiO₂ content was 10%,the photocatalytic degradation rate of PMMA/R-TiO₂ and PMMA/A-TiO₂ composite nanofibers were 21.8% and 51.3%.