Improving the removal rate of bisphenol A and Cu 2+from water using P/N coexisting β-cyclodextrin-based adsorbents by enhancing adsorbents-pollutants interactions

Bisphenol A (BPA), a prominent endocrine-disrupting compound, has garnered considerable attention due to its urgent need for rapid removal from water. Herein, we first used a novel reactive phosphine oxide containing tertiary amines as crosslinker to prepare water-insoluble crosslinked beta- cyclodextrin ( beta- CD) adsorbent via radicalmediated thiol-ene polymerization. Owing to the synergistic hydrogen-bond (H-bond) interactions of functional groups (tertiary amine and P -- O groups) toward BPA, the resulted adsorbents showed fast adsorption kinetics to BPA with an adsorption equilibrium time of 5 min. After six adsorption-desorption cycles, the removal efficiency of BPA was 92.5 %, indicating its excellent reusability. Due to the presence of the C - S bonds, the beta- CD -derived bio-adsorbents offered binding sites for Cu 2+ ions, resulting in a maximum adsorption capacity of 113.89 mg g -1 .