【摘要】 采用表面印迹技术,以Cr（Ⅲ）为模板离子,2（2-吡啶）甲醇为功能单体,3-碘丙基三乙氧基硅烷为交联剂,介孔硅材料MCM-41为固相载体,设计并合成了含氮双齿配体修饰的铬（Ⅲ）离子印迹介孔二氧化硅材料（Cr（Ⅲ）-IIPs）。采用红外光谱、固态核磁共振、小角X射线衍射、扫描电镜、透射电镜和氮气吸附-脱附（BET）实验对此印迹材料的结构和形貌进行了表征。BET测试结果表明,Cr（Ⅲ）-IIPs的比表面积（625.3 m2/g）大于Cr（Ⅲ）-NIPs（527.1 m2/g）。温度为25℃,pH=5,吸附时间为30 min时,此印迹材料对Cr³⁺离子的吸附达到平衡,吸附容量为151.2 mg/g。等温吸附模型和吸附动力学研究表明,吸附等温模型符合Langmuir模型,相关系数为0.9929;吸附动力学符合Pseudo-second-order模型,相关系数为0.9806。Cr（Ⅲ）-IIPs对Cr³⁺/CrO₄^2-、Cr³⁺/Cu²⁺、Cr³⁺/Cd²⁺、Cr³⁺/Hg²⁺、Cr³⁺/Co²⁺、Cr³⁺/Ni²⁺的相对选择性系数分别为5.13、1.21、1.97、1.71、1.27和4.00,对Cr³⁺具有较强的选择性。Cr（Ⅲ）-IIPs经10次再生后,吸附量为初始量的90.7%,再生循环效果较好。更多还原

【Abstract】 A novel chromium （Ⅲ） ion-imprinted material（ Cr（Ⅲ）-IIPs） was prepared by the surface imprinted technique with Cr（Ⅲ） ion as the template,di（ 2-pyridyl） methanol as functional monomer,3-（ triethoxysilyl）-propyl-iodine as cross-linking agent and mesoporous silica MCM-41 as solid supports. The structure and morphology of Cr （Ⅲ）-IIPs and NIP were characterized by Fourier transform infrared spectroscopy,nuclear magnetic resonance, small angle X-ray diffraction, scanning electron microscopy, transmission electron microscope and N2 adsorption-desorption analysis. The BET test results showed that the specific surface area（ 625.3 m2/g） of Cr（Ⅲ）-IIPs was greater than that of NIP（ 527.1 m2/g）. When the temperature was 25℃,pH= 5 and the adsorption time was 30 min,the adsorption of Cr³⁺ ions on the imprinted material reached an equilibrium and the adsorption capacity was 151. 2 mg/g. The isothermal adsorption model and adsorption kinetics study showed that the adsorption isotherm model conformed to Langmuir model. The model had a correlation coefficient of 0. 9929. The adsorption kinetics followed the pseudo-second-order model and the correlation coefficient was 0.9806. The relative selectivity coefficients of Cr（Ⅲ）-IIPs for Cr³⁺/Cr⁶⁺,Cr³⁺/Cu²⁺,Cr³⁺/Cd²⁺,Cr³⁺/Hg²⁺,Cr³⁺/Co²⁺,Cr³⁺/Ni²⁺were 5.13,1.21,1.97,1.71,1.27 and 4.00,showing that Cr（Ⅲ）-IIPs had strong selectivity for Cr³⁺ions. After regeneration for ten times,the adsorption capacity of Cr（Ⅲ）-IIPs remained at 90.7%. The Cr（Ⅲ）-IIPs showed good selectivity,reusability and stability.更多还原