Preparation And Application Of Melamineformaldehyde,Urea-formaldehyde And Melamine-urea-formaldehyde Resin Microspheres

Resin microspheres is a very important and have extensive applications polymeric material,melamine-formaldehyde resin microspheres,urea-formaldehyde resin microspheres and melamine-urea-formaldehyde resin microspheres were prepared by dilute solution precipitation polymerization.Resin microspheres had many advantages,including cheap materials,simple synthesis method,that is widely used as catalyst support,drug carrier,adsorption material,carbon matrix and template.In this paper,monodisperse melamine-formaldehyde(MF)resin microspheres were prepared by dilute solution precipitation polymerization without any surfactant and stabilizer.The optimal preparation conditions and the mechanism of microsphere formation of the microspheres were investigated by microscopy,Fourier transform infrared spectra,thermal stability,and particle size analysis.The microspheres prepared under optimal conditions had a clean surface,good thermal stability,and a narrow distribution with a mean diameter of about 2.5 ?m.In addition,the microsphere had an abundance of amino and imino functional groups that could supply numerous active points for adsorption.From a study of the static and dynamic adsorption of lead(II)(Pb(II))using MF resin microspheres as the adsorbent,it was found that the resin microspheres showed a fast adsorption and high removal efficiency of Pb(II).Urea-formaldehyde(UF)resin microspheres were prepared by dilute solution precipitation polymerization.The UF resin microspheres were characterized by SEM,TGA,FTIR.The UF resin microspheres exhibited higher pellet yield,clean surface and good thermal stability.Bisides,melamine-urea-formaldehyde(MUF)resin microspheres were fabricated by dilute solution precipitation polymerization method and used as adsorbent for adsorption of Pb(II)from aqueous solution.The MUF resin microspheres were characterized by SEM,TGA,FTIR,particle size analysis and tested for Pb(II)adsorption.The MUF resin microsphere adsorbent had outstanding desorption and reusability performance.These results indicate that the MUF resin microsphere could be suitable for adsorption.