Preparation a novel catalytic hydrogel based on biopolymers and graphene oxide containing palladium nanoparticles

In recent years, for processes that are more environmentally friendly and the design of chemical products, the concepts of Green Chemistry have gained great importance. Lately, the development and application of green catalysts have possessed a large number of studies in industrial and academic groups to reduce or eliminate the use of dangerous substances [1]. The past two decades have witnessed a rapid development of hydrogels as the novel materials in both academic and industrial domains. Hydrogels are three-dimensional polymeric networks that are usually cross-linked to render the network insoluble. Also, the structural properties of hydrogels can provide in situ nanoparticle synthesis. So, the hydrogel is suitable for use as a solid support for the preparation and immobilizing of metal nanoparticles. Nowadays, polysaccharides based hydrogels such as Chitin, chitosan, starch, alginate, hyaluronic acid, and cellulose have investigated as promising materials. On the other hand, they can generate three dimensional (3D) porous structure to improve transfer and mass diffusion during catalytic reactions [2]. In this paper, we have been tried to design and synthesis of the hydrogels based on polysaccharides (chitosan NPs and dialdehyde cellulose nanowhiskers) and graphene oxide to creating a suitable solid support for adsorbing and stabilizing Pd NPs. Hydrogel composite Contains Pd NPs prepared as the catalyst was used in the Mizoroki-Heck coupling reaction and investigated its catalytic activity.