PREPARATION AND ADSORPTION OF THIOUREA MODIFIED GLUTARALDEHYDE-CROSSLINKED CHITOSAN RESINS

摘要

The preparation and adsorption of thiourea modified glutaraldehyde-crosslinked chitosan resin (Thio-chitosan) using cyanuric chloride as activator was studied. The adsorptive capacity of thio-chitosan with 15% apparent degree of crosslinking (DC, mass ration of glutaraldehyde to chitosan) to Cu(Ⅱ) was 160mg/g (dry weight). The adsorption of Cu(Ⅱ) was correlated with Freundlich and Langmuir isotherm equation. Cu(Ⅱ) adsorbed on thio-chitosan column ( 1 cm×10 cm)was eluted with 0.5mol/L H2SO4, 6mol/L HCl and 3% thiourea solution with the recovery of 88.3%,86.1% and 95.3%, respectively. The thio-chitosan resin can be applied to the separation and recovery of metal ions.