Chloride Anion Adsorption from Wastewater Using a Chitosan/β‐Cyclodextrin‐Based Composite

Abstract In order to remove Cl − ions from wastewater, an adsorbent composite with high efficiency for Cl − adsorption was prepared by the crosslinking method, where chitosan (CTS) was used as the matrix to crosslink the β‐cyclodextrin polymer (β‐CDP). The preparation conditions of the composite membrane were optimized based on the chloride adsorption effect. The chloride adsorption performances of the CTS/β‐CDP complex and the CTS/β‐CDP composite membrane were significantly higher than that of the CTS‐only membrane, and the composite membrane showed slightly better performance than the complex. The structure and properties of the chitosan/β‐cyclodextrin‐based composite membrane were characterized by scanning electron microscopy, X‐ray diffraction, and Fourier transform infrared spectroscopy. The prepared composite material can be used for the adsorptive removal of Cl − in water, with further research and development prospects.