Cellulose/CaCO3 nanocomposites: Microwave ionic liquid synthesis, characterization, and biological activity

► Cellulose/CaCO3 nanocomposites were successfully prepared. ► A green strategy of microwave-assisted ionic liquid method was developed. ► The solvents had an effect on the shape of products. ► The influence of alkali extraction cellulose concentration was investigated. ► The biological activity of cellulose/CaCO3 nanocomposites was evaluated.