Highlights CA/CPB nanofibers have a filtration efficiency of 99.9 % for aerosol (7−300 nm). The Ergun’s porosity of the nanofibers is 98 % and the permeability about 10 −11 m 2 . CA/CPB nanofibers are biodegradable and sustainable novel air filters. The nanofibers are able to retention environmental PM 2.5 , BC and also virus.

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[Hmim][HSO] ionic liquid (IL) and bio-renewable sources as chitosan (CHT) and chondroitin sulfate (CS) were used to yield hydrogel-based materials (CHT/CS). The use of IL to solubilize both polysaccharides was considered an innovative way based on "green chemistry" principle, aiming the production of CHT/CS blended systems. CHT/CS hydrogels were carried out in homogeneous medium from short dissolution times. The hydrogels were characterized and achieved with excellent stabilities (in the 1.2-10pH range), larger swelling capacities, as well as devoid of cytotoxicity towards the normal VERO and diseased HT29 cells. The CHT/CS hydrogels carried out in [Hmim][HSO] could be applied in many technological purposes, like medical, pharmaceutical, and environmental fields.

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