Study on Amino-functionalized Porous Carbon Materials for MB and Cr(VI) Adsorption

Abstract

From the perspective of environmental protection, high removal rate, reusability and degradability, Amino-functionalized porous hydrogel material P-(EA-β-CD/KHA/AC) was synthesized by introducing ethylamino cyclodextrin, humic acid and activated carbon, using polyacrylic acid as the carrier. The gel materials before and after adsorption were characterized by FTIR, XRD and XPS. The removal of organic matter (MB) and heavy metal ions (Cr (VI)) showed high adsorption capacity. At 298K and pH 8, the adsorption capacity of P-(EA-β-CD/KHA/AC) hydrogel for MB and Cr (VI) was as high as 262.31mg/g, 170.12mg/g, and the removal rate was 98.96 % and 70.27%. The adsorption behavior follows the pseudo-second-order kinetic equation, conforming the Langmuir model, and through intermolecular forces, π-π conjugation, chelation and other interactions, an entropy-increasing, endothermic, and spontaneous process is formed. The regeneration and degradability experiments of P-(EA-β-CD/KHA/AC) hydrogel were carried out, verified that it has recycling performance, the weight loss rate of degradation in water and acid-base buffer solution for 6 months reached 45.82%, 28.25% and 30.70%, respectively.