Encapsulation of Palladium Nanoparticles by Multiwall Carbon Nanotubes-graft-Poly(citric acid) Hybrid Materials

Citric acid was polymerized Onto the Surface of functionalized multiwall carbon nanotubes (MWCNT-COOH) and MWCNT-graft-poly(citric acid) (MWCNT-g-PCA) hybrid materials were obtained. Due to the grafted poly(citric acid) branches, hybrid materials not only were soluble in water but also were able to trap water soluble metal ions. Reduction of trapped metal ions in the polymeric shell of MWCNT-g-PCA hybrid materials by reducing agents such as sodium borohydride led to encapsulated metal nanoparticles on the Surface of MWCNT. Herein palladium nanoparticles were encapsulated and transported by MWCNT-g-PCA hybrid materials (MWCNT-g-PCA-EPN) and their application as nanocatalyst toward Heck reaction in different conditions was investigated. The catalytic activity of palladium ions supported by MWCNT-g-PCA hybrid materials (MWCNT-g-PCA-PdCl2) toward Heck reactions is much more than for MWCNT-g-PCA-EPN. Structure, characteristics and catalytic activity of synthesized systems was investigated using spectroscopy and microscopy methods. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 116: 2188-2196, 2010