【摘要】 研究了用亚胺基二乙酸树脂(D401)吸附镉离子的过程。结果表明,在pH=5.73时树脂对镉的吸附效果最佳,测得树脂的静态饱和吸附容量为363 mg.g-1;用0.5 mol/L HCl作解吸剂,解吸率为100%,表观吸附速率常数k298=2.05×10-5s-1,表观吸附活化能Ea=18.0 kJ/mol,等温吸附服从Freundlich经验式;吸附热力学参数ΔH=3.08 kJ/mol,ΔS=35.9 J/(mol.K),ΔG=-7.62 kJ/mol,树脂功能基与镉离子的配位摩尔比为1∶1。用化学和红外光谱等方法讨论了吸附机理。更多还原

【Abstract】 The sorption of Cd（Ⅱ） with iminodiacetic acid resin（D401） was investigated.The results show that D401 has a good sorption ability for Cd（Ⅱ） in the HAcNaAc medium at pH=5.73.The statically saturated sorption capacity of resin is 363mg/g and 0.5mol/L HCl can be used as an eluant;the elution percentage is 100%,the sorption rate constant is k₂₉₈=2.05×10^-5s^-1,and the apparent sorption activation energy of D401 for Cd（Ⅱ） is 18.0kJ/mol.The sorption behavior of D401 for Cd（Ⅱ） obeys the Freundlich isotherm.The sorption thermodynamic parameters of D401 for Cd（Ⅱ） are: enthalpy change ΔH=3.08kJ/mol,free energy change ΔG =-7.62kJ/mol,entropy change ΔS =35.9J/（mol·K）,respectively.The coordination molar ratio of the functional group of D401 to Cd（Ⅱ） is 1∶1.The sorption mechanism of D401 for Cd（Ⅱ）was confirmed by chemical analysis and IR spectrometry.更多还原