| Abstract:In this study， the amphoteric cellulose-based adsorbent with high carboxyl content of 5.11 mmol/g and amino content of 7.43 mmol/g was prepared via cross-linking method using microcrystalline cellulose prepared from bagasse as the substrate， amphoteric small molecules containing amino and carboxyl groups as functional reagents， epichlorohydrin as the cross-linking agent， and the competitive adsorption behaviors and adsorption kinetics of heavy metal ions on the surface were resolved. The results showed that the adsorbent could remove 1.0 mg/L of Cr（Ⅵ）， Pb（Ⅱ）， Cd（Ⅱ）， and 2.0 mg/L of Cu（Ⅱ） to below 0.0030 mg/L within 120 min， so that residual concentration of heavy metal ions in the solution complied with the national safe drinking water standard GB 5749—2022， which achieved simultaneous and efficient removal of multiple heavy metal ions with low concentration. The adsorbent fitted the Langmuir adsorption isotherm model for heavy metal ions and was dominated by monolayer chemisorption. The maximum theoretical adsorption capacities were 373.1， 128.4， 134.4， and 113.3 mg/g for Cr（Ⅵ）， Cu（Ⅱ）， Pb（Ⅱ）， and Cd（Ⅱ）， respectively. |
