Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (6): 1044-1050.DOI: 10.1016/S1872-2067(18)63049-9

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Facile in-situ synthesis and deposition of monodisperse palladium nanoparticles on polydopamine-functionalized silica gel as a heterogeneous and recyclable nanocatalyst for aerobic oxidation of alcohols

Hojat Veisi, Ahmad Nikseresht, Shahin Mohammadi, Saba Hemmati   

  1. Department of Chemistry, Payame Noor University, Tehran, Iran
  • Received:2017-12-29 Revised:2018-02-21 Online:2018-06-18 Published:2018-05-16
  • Contact: 10.1016/S1872-2067(18)63049-9

Abstract:

This paper describes a facile in-situ synthesis of palladium nanoparticles (Pd NPs) on silica gel/polydopamine composite (SiO2/PDA) without any stabilizer or reducing agent. In this approach, palladium ions were adsorbed on SiO2/PDA surfaces by immersing the PDA-coated SiO2 particles in a palladium plating bath. Then, they were reduced in situ to Pd nanoclusters by the reducing ability of PDA's N-containing groups. The structure, morphology, and physicochemical properties of the synthesized nanocomposites were characterized by different analytical techniques such as high-resolution transmission electron microscopy, field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction analysis, X-ray photoelectron spectroscopy, inductively coupled plasma and Fourier-transform infrared spectroscopy. The Pd NPs capped by the PDA groups had a strikingly small size (30-40 nm). SiO2/PDA/Pd NPs exhibited high catalytic activity as a recyclable nanocatalyst in the aerobic oxidation of alcohols. Furthermore, recovery and multiple reuse of the catalyst revealed no detectable activity loss.

Key words: Silica, Polydopamine, Palladium nanoparticle, Oxidation, Alcohol