Adsorption properties of P-(CM-β-CD/HPCS/KHA/AC) hydrogel for tetracycline hydrochloride

Abstract

Amino functionalized porous hydrogel material P-(CM-β-CD/HPCS/KHA/AC) was synthesized by using polyacrylic acid as the carrier, including acetate cyclodextrin, hydroxypropyl chitosan, potassium humate and activated carbon from the perspectives of environmental protection, high removal rate, reusable and degradable. The gel materials before and after adsorption were characterized by FTIR, TG, XRD and XPS, and showed high adsorption capacity for the removal of antibiotic (tetracycline hydrochloride (TCH). At 298K and pH 4, the adsorption capacity of P-(CM-β-CD/HPCS/KHA/AC) hydrogel on TCH reached 98.36mg/g, and the removal rate was 68%. The adsorption behavior follows the quasi-second-order kinetic equation, which accords with the Langmuir model, and through electrostatic interaction, π-π conjugation and hydrogen bond interaction, the entropy increase, endothermic and spontaneous process is formed. The regeneration and degradability experiments of P-(CM-β-CD/HPCS/KHA/AC) hydrogel were carried out to verify its recycling performance and environmental protection.