Preparation And Performance Study Of Composite Nanofibers Doped Silver Nanoparticles

Silver nanoparticles （AgNPs） have unique antibacterial, catalyst, optics and otherproperties. That doping AgNPs into inorganic or organic matrix to obtain compositenano-materials not only reduce the use of silver, benefit recycling and reusing, but alsogive full play to the synergy between AgNPs and substrate materials, which can producethe novel properties not matched by any single materials. In this dissertation, we havecombined chemical reduce method, electrospinning and calcinated technology to preparefunctional one-dimension composite nano-materials （nanofibers）, and studied theperformance of composite nano-materials. Some innovative achivements have beenobtained. The major studies were shown as follows.Ultrafine AgNPs have been prepared by in stiu method. The influence of reducingagent and solvent on the preparation of AgNPs/PVP, AgNPs/β-CD/PVP andAgNPs/β-CD/PAN colloide was explored. AgNPs/PVP, AgNPs/β-CD/PVP andAgNPs/β-CD/PAN composite nanofibers have been achieved by electrospinning.Experimental results show that the size of AgNPs was uniform and they are successfullydispersed in the organic fiber matrix. Antibacterial property tests show that the compositenanofibers doped AgNPs have good antibacterial properties against on both escherichiacoli and staphylococcus aureus.TiO₂nanofibers have been prepared by electrospinning and calcinated technology.And then, On the basis of preparation of AgNPs/PVP nanofibers, TiO₂nanofiberscontaining AgNPs have been successfully prepared. Characterization results show thatAgNPs was distribute uniformly in the TiO₂nanofibers, and the fibers have more pores,which is an ideal structure to any catalyst. The composite nanofibers were used asphotocatalyst to degrade methyl orange to investigate the photocatalytic performance ofthe AgNPs/TiO₂nanofibers. The outstanding photocatalyst have been obtained byadjusting the Ag/Ti ratio of composite. When the Ag/Ti molar ratio is1/100, thephotocatalytic performance of the AgNPs/TiO₂nanofibers was increased by17%thanTiO₂nanofibers.AgNO3/PAN electrospun fibers have been reduced to AgNPs/PAN fibers usinghydrazine hydrate and hydrogen （H2）. Then, carbon nanofibers （CNFs） containing AgNPs hanv been obtained by using calcination technology. The prepared AgNPs/CNFswere used as catalysts in styrene oxidation reaction. By comparison, when the Ag/PANmolar ration was1/10in the electrospun solution, AgNPs/CNFs prepared by H2reductionhad a better catalytic performance to the styrene oxidation reactions. The conversion rateof styrene up to43%, and the corresponding selectivity of styrene oxide andbenzaldehyde were38.9%and54.5%, respectively.The researching works of this dissertation give the ideas of designing and synthesisnovel one-dimensional composite materials doped AgNPs. And these studies provide thetheoretical basis of composite nanofibers containing AgNPs applied in the biomedical,wastewater treatment and catalytic fileds.