【摘要】 分别用壳聚糖及Zn2+模板壳聚糖膜与Zn2+螯合反应,在30、40、50、60、70℃测定出锌离子浓度随时间变化的数据,由dc/dt=-kcn进行拟合,以线性相关系数为判据,得到该螯合反应的积分动力学模式函数:2c=-kt。表观活化能E壳(131.96 kJ/mol)>E膜(89.92 kJ/mol),表明Zn2+模板壳聚糖膜对Zn2+具有较强的“记忆”能力。并用红外光谱(IR)光电子能谱(XPS)对壳聚糖与Zn2+的螯合机理进行了探讨。结果表明Zn2+壳聚糖螯合物的配位原子是-NH2中的N,壳聚糖分子链上的-OH没有参与配位反应。更多还原

【Abstract】 The reactions of chitosan and chitosan menbrane with Zn²⁺ ion as template were studied.The adsorption isotherms were correlated by dc/dt=-kcⁿ at the temperatures of 30,40,50,60,70℃.By means of linear correlation,the shapes of the isotherms curves are similar to the kinetic function of 2c=-kt,and the apparent activation energies of E（chitosan） and E（membrane） with Zn²⁺ ion are 131.96 and 86.92 kJ/mol,respectively.The chitosan membrane with Zn²⁺ ion template has better "memory".The adsorption mechanism of chitosan with Zn²⁺ was studied by IR and XPS,and the results indicated that the nitrogen of-NH₂ of chitosan was coordinated but the oxygen of-OH of chitosan did not take partin the coordination.更多还原