In this study, eco-friendly palladium nanoparticles (Pd NPs@Pct-CMC/Fe3O4) with magnetic recoverability, high efficiency, renewability, reusability, and high thermal stability were fabricated on pectin/carboxymethyl cellulose composite and their chemical structures were illuminated by FT-IR, XRD, SEM, EDS mapping, ICP-OES, and TG/DTG analyses. It was found that average size of the palladium nanoparticles changed in the range of 49-85nm, and they homogeneously dispersed on the composite. Then, catalytic performance of Pd NPs@Pct-CMC/Fe3O4 was investigated against (i) synthesis of various biaryl compounds under solvent-free media and (ii) catalytic reduction of highly toxic 4-nitrophenol using NaBH4 in aqueous medium at room temperature. The catalytic tests showed that Pd NPs@Pct-CMC/Fe3O4 is excellent catalyst for synthesis of biaryl compounds by giving high reaction yields in 7min. Pd NPs@Pct-CMC/Fe3O4 also indicated superior catalytic performance for catalytic reduction of 4-nitrophenol in only 100s. More importantly, Pd NPs@Pct-CMC/Fe3O4 displayed excellent reproducibility in the synthesis of various biaryl compounds and catalyticreduction of 4-nitrophenol due to their magnetically separable nature. As a consequence, this study revealed that Pd NPs@Pct-CMC/Fe3O4 accelerated the fabrication of biaryls and the catalyticreduction of 4-nitrophenol. [GRAPHICS] .