In the present study, the green synthesis of Pd nanoparticles by Chlorella vulgaris aqueous extract on the surface of magnetic carbon
quantum dots have been developed. Carbon quantum dots were synthesized from date biochar and then magnetized with Fe3O4
magnetic nanoparticles. After that Pd nanoparticles were immobilized on the surface of magnetic carbon quantum dots via reduction
of palladium ions with Chlorella vulgaris plant extract as a capping and reducing agent. To study catalytic activity of the prepared
catalyst, the Suzuki- Miyaura cross-coupling reaction of phenyl boronic acid in H2O/EtOH as a green solvent was studied. After
optimizing reaction condition, a variety of aryl halide with different functional groups were chosen as the substrate in the SuzukiMiyaura cross-coupling reaction, which were performed well for all the examined substrate and the corresponding products were
obtained in high yields. The reaction of aryl bromide and iodied with electron donating and electron‐withdrawing groups was
generated the corresponding products in good to excellent yields with short reaction time. The coupling reaction of chlorobenzene
with phenylboronic acid requires extended reaction time compared to aryl iodides and bromide and produced the desired product in
moderate yield. Moreover, the leaching metal is a significant parameter for stability and industrial applicability of catalysts, to this
end, the ICP technique was used. The amount of palladium loaded on the catalyst after 5 runs were found as 4.1 wt%, which was a
slight change (4.8 wt %). The prepared nanocatalyst showed good catalytic performance after 5 times of use, so that it retained more
than 94% of their activity even at the 5th run of catalytic reuse.
