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

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.