摘要
文中以苯乙烯(St)和二乙烯基苯(DVB)为单体,通过分散聚合、两步种子溶胀法及超交联反应法合成了富含微孔、介孔和大孔的多级孔聚苯乙烯(PS)微球,借助摇床法实现了微球批量化制备;然后以氯金酸(HAuCl_(4))为前驱体,采用热还原法在多级孔PS微球上原位负载金纳米颗粒(Au NPs),得到Au NPs/多级孔PS复合微球。采用傅里叶变换红外光谱仪、扫描电子显微镜、全自动物理吸附仪、X射线电子能谱仪(XPS)、X射线衍射仪(XRD)等对微球的结构进行了表征。结果表明,采用摇床法能得到具有良好单分散性的PS微球,随着分散剂聚乙烯吡咯烷酮(PVP)用量增加,微球粒径逐渐减小;采用甲苯/邻苯二甲酸二丁酯为致孔剂,可得到具有较高比表面积的多孔PS微球,超交联反应后微球比表面积进一步提高到565.22 m^(2)/g;XRD和XPS分析结果表明,HAuCl_(4)被还原为Au NPs,并成功负载于多级孔PS微球中;将其用作NaBH4还原刚果红的催化剂,14 min即可达到95%的降解效果,经过10次循环后催化效果仍能保持83.8%,具有良好的循环稳定性。
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 HAuCl_(4) 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 m^(2)/g after hyper-crosslinking reaction.The results of XRD and XPS analysis show that HAuCl_(4) 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.
作者
张金铭
王楠
张高文
Jinming Zhang;NanWang;Gaowen Zhang(School of Materials and Chemical Engineering,Hubei Provincial Key Laboratory of Green Materials for Light Industry,Hubei University of Technology,Wuhan 430068,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2024年第7期35-42,共8页
Polymer Materials Science & Engineering
关键词
多级孔聚苯乙烯微球
金纳米颗粒
超交联
催化性能
microporous polystyrene microspheres
Au nanoparticles
hyper-crosslinking
catalytic performance
