壳聚糖衍生物对Zn(Ⅱ)的吸附行为

An adsorption system was used to study the adsorption of Zn（Ⅱ） ion from chitosan derivatives,chitosan α-ketoglutaric acid（KCTS）and hydroxamated chitosan α-ketoglutaric acid（HKCTS）.Experiments were carried out to study the effects of pH and concentration of Zn（Ⅱ） ion.It was found that the bonding between Zn（Ⅱ） and chitosan derivatives was in accordance with the Langmuir isotherm.The kinetic experimental data correlated well with the second-order kinetic model, indicating that the chemical sorption was the rate-limiting step.The apparent activation energy value of adsorption were 25.47 kJ·mol~ -1 and 5.473 kJ·mol~ -1 for KCTS and HKCTS respectively, and the sorption rate constant of Lagergren second-order sorption were 0.00311 g·mg~ -1 ·min~ -1 and 0.005 g·mg~ -1 ·min~ -1 at 293 K, respectively.