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[Display omitted] • Preparation of palladium complex stabilized on nanomagnetic lignin. • C-N coupling reaction was performed in a short time. • The catalyst shows excellent activity and generality in C-N coupling reaction. • Catalyst can be recovered and reused several times without any meaningful decrease in the catalytic activity. The present work describes the preparation of a palladium catalyst using 5-(methylthio)-1 H -tetrazole (Thio-Tet) as a ligand and 3-chloropropyltrimethoxysilane ((MeO) 3 Si-PrCl) as a linker, which was adsorbed onto nanomagnetic lignin (Fe 3 O 4 @LS)-Thio-Tet-Pd(II)). The resulting nanocatalyst (Fe 3 O 4 @LS-thio-Tet-Pd(II)) was successfully applied for the synthesis of arylaminotetrazoles via N -arylation of 5-amino-1 H -tetrazole (5-AT) with aryl iodides. Fe 3 O 4 @LS-thio-Tet-Pd(II) was characterized using FT-IR (Fourier transform-infrared spectroscopy), XRD (X-ray diffraction), EDS (energy dispersive X-ray spectroscopy), VSM (vibrating sample magnetometer), SEM (scanning electron microscope), TEM (transmission electron microscopy), ICP-AES (Inductively coupled plasma atomic emission spectroscopy) and tetrazoles derivatives were analyzed using FT-IR and NMR techniques. The results demonstrated that the catalyst can be recycled five times without any significant decrease in catalytic efficiency, confirming its robustness. [ABSTRACT FROM AUTHOR]

[Display omitted] • Advances in catalytic and environmental applications of biopolymer-based ionic liquids are described. • Synthetic methods are highlighted for obtaining polysaccharide and lignin-based ionic liquids. • Catalytic activity of alginate, cellulose, lignin, chitosan and starch based ionic liquids have been reviewed. Today, the use of heterogeneous catalysts for various chemical and environmental transformations is of great interest. For this aim, researchers have applied different natural or synthetic supports for the heterogeneity of catalysts. The most widely used catalyst supports are perlite, bentonite, diatomite, and synthetic and natural polymers. Natural polymers (biopolymers) are one of the most promising compounds, which are widely applied as efficient and green supports. Among biopolymers, polysaccharides are highly regarded as catalyst supports by researchers. Many studies have been performed on improvements in the synthesis, characterization, and applications of biopolymers such as alginate, cellulose, lignin, chitin/chitosan and starch based catalysts. These polymers have some advantages such as biodegradability, biocompatibility, non-toxicity, and unique structures. This review paper describes the applications of alginate, cellulose, chitosan, starch and lignin supported ionic liquids (ILs) as catalysts for many catalytic and environmental applications. These catalysts are applied in reactions such as acetalization, hydrogenation, condensation, reduction, oxidation, epoxidation, and synthesis of 1,2,3-triazoles, dichlorophenylphosphine, diaryl ether, etc. As green resources, polysaccharides and lignin-based catalysts have many merits such as low cost, availability, good stability, recyclability, etc. [ABSTRACT FROM AUTHOR]