Colloid template route for the synthesis of polyaniline-Pd nanocomposite and catalytic activity study for Suzuki-Miyaura coupling reaction in aqueous media

Abstract

This work presents a new type of polyaniline-palladium (PANI-Pd) nanocomposite with different loading of Pd nanoparticle (0.5, 1 and 1.5 Wt.%) for catalytic reaction study that nanotechnology and green chemistry can come together for the development of green media reaction and this is the central theme of the current paper. PANI-Pd nanocatalyst was successfully synthesized using a one-pot colloid solution in water by the reaction between aniline and PdCl2 with controlling the size of Pd nanoparticles inserted into the PANI matrix. The prepared PANI-Pd (1.0 Wt.%) nanocomposite as a typical sample supported by analysis techniques such as UV-Vis, Fourier transform infrared (FTIR), Powder X-ray diffraction (XRD), transmission electron microscopy (TEM). The UV-visible and FTIR revealed the strong interaction between PANI and Pd of the nanocomposite. The presence of Pd nanoparticles with a fcc crystal structure in the polymer nanocomposite confirmed with XRD. TEM analysis showed that the PANI-Pd nanocomposite has a good monodispersity of Pd nanoparticles in PANI matrix that Pd nanoparticles have spherical morphology with an average particle size of 30 nm. The catalytic behavior of the Pd-PANI nanocomposite was studied for Suzuki-Miyaura coupling reactions in the aqueous media. The excellent catalytic activity of the nanocomposite resulted in 82.5% yield in water for PANI-Pd (1.0 Wt.%) and the results revealed that the Suzuki-Miyaura reaction proceeds much faster in when potassium carbonate was used as the base.