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In this study, a facile one-step redox polymerization method for the preparation of highly dispersed palladium (Pd)/polypyrrole (PPy) nanocapsules has been demonstrated. During the polymerizaion process, the formation of RB-PdCl(4)(2-) complex via an electrostatic interaction plays a key role for the preparation of Pd/PPy composite nanocapsules. The well-dispersed Pd nanocrystals with small sizes of 2-4 nm embedded in PPy nanocapsules exhibited a good catalytic activity during the catalytic reduction of p-nitrophenol into p-aminophenol by NaBH(4) in aqueous solution. The kinetic apparent rate constant (k(app)) was about 8.87×10(-3) s(-1). Moreover, the as-prepared Pd/PPy composite nanocapsules exhibited a good reusability, which could be repeatedly used for the reduction of p-nitrophenol with a high catalytic activity for at least 10 successive cycles., (Copyright © 2012 Elsevier Inc. All rights reserved.)

In this report, CoFe2O4/Polypyrrole (PPy)/Pd ternary composite nanofibers are fabricated through a one-step redox reaction between pyrrole and Na2PdCl4 in the presence of electrospun CoFe2O4 nanofibers in ethylene glycol (EG). The generation of Pd nanoparticles is accompanied by the formation of PPy on the surface of electrospun CoFe2O4 nanofibers during the redox reaction. The as-prepared CoFe2O4/PPy/Pd composite nanofibers may be used as efficient catalysts for the p-nitrophenol hydrogenation with an apparent rate constant ( kapp) of about 13.2 × 10−3 s−1. The CoFe2O4/PPy/Pd composite nanofibers show good magnetic properties, which can be readily recycled under an external magnetic field. [ABSTRACT FROM AUTHOR]