Preparation of monodisperse polystyrene/silver composite microspheres and their catalytic properties |
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Authors: | Hu Yougen Zhao Tao Zhu Pengli Sun Rong |
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Institution: | (1) Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences and the Chinese University of Hong Kong, Shenzhen, 518055, People’s Republic of China; |
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Abstract: | This article presents a facile method for the preparation of polystyrene/silver (PS/Ag) composite microspheres. In this approach,
monodisperse PS spheres were synthesized via dispersion polymerization and modified by sulfonation to obtain sulfonated PS
spheres with sulfonic acid groups on the surfaces, and then adsorbed Sn2+ ions by electrostatic interaction and used as templates. PS/Ag composite microspheres were prepared successively by addition
of Ag(NH3)2]+ complex ions to the templates dispersion, adsorbing to the surfaces of templates, and then reduction of Ag(NH3)2]+ complex ions to Ag nanoparticles by sodium potassium tartrate. The results showed that monodisperse PS spheres with sulfonic
acid groups on the surfaces were coated by an incomplete and nonuniform coverage of Ag nanoparticles in the absence of Sn2+ ions. In the presence of Sn2+ ions, however, complete and uniform Ag nanoparticles coatings were obtained on the entire PS sphere. And the deposition density
and size of Ag nanoparticles can be controlled by Ag(NH3)2]+ concentration. The resulting PS/Ag composite microspheres were characterized by SEM, TEM, XRD, TGA, and UV-vis. Preliminary
catalytical tests indicated these PS/Ag composite microspheres showed good catalytic properties. |
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