Hypercrosslinked β-cyclodextrin porous polymer as adsorbent for effective uptake towards albendazole from aqueous media

A β -cyclodextrin based hypercrosslinked polymer (Bn-CD-HCP) was prepared using 4,4′-bis(chloromethyl)-1,1′-biphenyl as the crosslinker via a Friedel-Crafts reaction. The Bn-CD-HCP material showed high surface area and thermal stability, making it an efficient adsorbent for albendazole, a benzimidazole carbamate. 8 was determined to be the best pH value for albendazole adsorption and the time necessary to reach equilibrium of adsorption was 30 min. The adsorption process agreed with the pseudo-second-order model and Langmuir isotherm model. A high adsorption capacity of 181.82 mg g −1 was achieved. The negative value of Gibbs free energy change suggested a spontaneous adsorption process. In addition, Bn-CD-HCP could be reused for albendazole adsorption for multiple cycles without significant losing its adsorption amount.