Equilibrium and kinetics studies on the absorption of Cu(II) from the aqueous phase using a β-cyclodextrin-based adsorbent

► CDAA hydrogels exhibited typically three-dimensional network structure. ► CDAA hydrogels exhibited high Cu2+ adsorption capacity, up to 107.37 mg/g. ► The adsorption occurred via ion exchange and chemical interaction mechanisms. ► The adsorption kinetics were tested using four equations.