Preparation and Catalytic Performance of Multi-Stage Porous Polystyrene Microspheres
Multiporous polystyrene(PS)microspheres rich in micropores,mesoporous and macropores were synthesized by dispersion polymerization,two-step seed swelling and hyper-crosslinking using styrene(St)and divinylbenzene(DVB)as monomers.The Au NPs/multistage porous PS composite microspheres were prepared by in-situ loading of gold nanoparticles(Au NPs)on the multistage porous PS microspheres using HAuCl4 as precursor.The structures of the microspheres were characterized by FT-IR,SEM,BET,XPS and XRD.The results show that PS microspheres with good monodispersive properties can be obtained by the shaking table method,and the particle size of the microspheres decreases with the increase of the amount of dispersant polyvinyl pyrrolidone(PVP).Using toluene/dibutyl phthalate(DBP)as pore-causing agent,the porous PS microspheres with high specific surface area were obtained,and the specific surface area of microspheres further increases to 565.22 m2/g after hyper-crosslinking reaction.The results of XRD and XPS analysis show that HAuCl4 is reduced to Au NPs and successfully loaded in multistage porous PS microspheres.It is used as catalyst for the reduction of Congo red by NaBH4,and the degradation effect can reach 95％in 14 min,and the catalytic effect can still maintain 83.8％after 10 cycles,which has good cycle stability.
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