聚苯乙烯/银纳米粒子复合微球的合成及催化性能

首先通过乳液聚合和浓硫酸酸化制备表面富含磺酸根的磺化聚苯乙烯(PS)微球(直径532 nm),再用其静电吸附[Ag(NH_3)_2]~+离子,最后采用聚乙烯吡咯烷酮还原表面吸附的[Ag(NH_3)_2]~+离子,得到了负载银纳米粒子的PS/AgNPs复合微球.采用扫描电子显微镜、透射电子显微镜、紫外-可见光谱、红外光谱和X射线衍射表征了PS/AgNPs复合微球,并考察了其对甲基蓝(MB)的催化性能.结果表明,Ag纳米粒子高度分散在磺化PS微球表面;该PS/AgNPs复合微球对催化转化MB有较高的催化活性,并可多次重复利用.本研究在催化降解有机污染物方面有一定的实用价值.

Synthesis of Polystyrene/silver Nanoparticels Composite Spheres and Their Catalytical Application

This study reports the preparation of polystyrene/Ag nanoparticles( PS/Ag NPs) composite spheres and their catalytic application toward MB conversion. The composite spheres were prepared by synthesis of PS speres, their sulfonation, and finally reduction of [Ag(NH3)2]+ions absorbed on sulfonated PS spheres using polyvinyl pyrrolidone. The resultant PS/Ag NPs composite spheres were characterized using scanning electron miscroscopy, transmission electron microscopy, UV-Vis spectroscopy, Infrared spectroscopy and X-ray diffraction spectroscopy, and their catalytic properties were examined. These results show that small Ag NPs with diameter of about 9—18 nm were well dispersed on the PS spheres and the PS/Ag NPs composite exhibits excellent catalytic activity towards MB conversion without obvious deteriorating after five cycles of running. This study, thus, may have impact on the degradation of organic contaminants in water.