Palladium nanoparticles (Pd NPs) immobilized over polydopamine-functionalized Zn-Al mixed metal oxide as a novel nanocatalyst for synthesis of C-C bond via Suzuki-Miyaura coupling reactions

Abstract

In recent times modified hydrotalcite like compounds formed with metal oxide layers has gained considerable importance as improved nanoparticle (NP) supports along with their unique electronic properties that inherently stabilizes the immobilized NPs. The present work demonstrates an adapted protocol towards the Pd NPs immobilized polydopamine modified Zn-Al mixed metal oxides (Zn-Al MMO@PDA/Pd NPs). Polydopamine was chosen as a biotemplate and a green reductant for the synthesis Pd NPs in situ without having any harsh reagent. Hitherto, this is the first design and biogenic synthesis of Pd NPs impregnated coordination on Zn-Al mixed metal oxides (Zn-Al MMO) and subsequent catalytic application towards the Suzuki-Miyaura coupling reactions. Subsequently, its physicochemical features were evaluated applying diverse methods like Field Emission Scanning Electron Microscopy (FE-SEM), X-ray elemental mapping (WDX), Energy Dispersive X-ray Spectroscopy (EDX) and X-Ray Diffraction (XRD) study. The Zn-Al MMO@PDA/Pd NPs nanocatalyst was isolated by centrifuger and stable enough to be reused for 8 consecutive times without considerable loss in activity.