基于MCM-41分子筛表面的镱离子印迹聚合物的制备及其性能  

Preparation and Characterization of Yb Ion-Imprinted Polymers Based on MCM-41 Molecular Sieve Surface

作　　者：黎先财 田明磊 程玉雯 汪秀 LI Xiancai;TIAN Minglei;CHENG Yuwen;WANG Xiu(College of Chemistry,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学化学学院,南昌330031

出　　处：《应用化学》2019年第2期203-211,共9页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(51664042)资助~~

摘　　要：运用离子印迹技术,以3-氯丙基三乙氧基硅烷为锚定剂,将功能单体直链聚乙烯亚胺(PEI)接枝在MCM-41分子筛表面,选择镱离子作为模板离子,以环氧氯丙烷交联制备出基于MCM-41表面的镱离子印迹聚合物Yb(Ⅲ)-ⅡP-PEI/MCM-41,并以同样的方法制备非离子印迹聚合物(NIP-PEI/MCM-41)。利用傅里叶变换红外光谱仪和扫描电子显微镜等技术手段对Yb^(3+)印迹聚合物进行表征,采用静态吸附法确定了Yb(Ⅲ)-ⅡP-PEI/MCM-41对Yb^(3+)的最佳吸附条件及选择性吸附性能。结果表明,Yb(Ⅲ)-ⅡP-PEI/MCM-41和NIP-PEI/MCM-41的最大吸附量分别为229. 93和99. 27 mg/g;印迹材料对Yb^(3+)的吸附符合Langmuir模型;吸附平衡在40 min的时候基本可以达到,可以利用准二级动力学模型来描述其吸附过程; Yb(Ⅲ)-ⅡP-PEI/MCM-41对Yb^(3+)具有较强的选择性,同时也具有很好的重复使用性能。成功地将MCM-41和离子印迹聚合物的优点结合起来,制备出一种对稀土Yb离子既有高吸附量又有高选择性的吸附材料,为进一步将其应用在处理实际废水,分离回收低浓度稀土废水中的稀土元素等方面打下了基础。By ion-imprinting technology,3-chloropropyltriethoxysilane as anchor,functional monomer linear polyethyleneimine( PEI) was grafted on the surface of MCM-41 molecular sieve. With Yb ions as template ions,and epichlorohydrin as cross-linking agent,a Yb( Ⅲ) ion-imprinted polymer( ⅡP),Yb( Ⅲ)-ⅡP-PEI/MCM-41,was prepared on MCM-41 surface. A non-ion-imprinted polymer( NIP-PEI/MCM-41) was prepared via similar process. Yb3+imprinted polymer was characterized by infrared spectroscopy and scanning electron microscopy. The optimal adsorption conditions and selective adsorption performance of Yb( Ⅲ)-ⅡP-PEI/MCM-41 for Yb3+were determined by static adsorption method. The maximum adsorption capacities of Yb( Ⅲ)-ⅡP-PEI/MCM-41 and NIP-PEI/MCM-41 are 229. 93 mg/g and 99. 27 mg/g,respectively. The adsorption of Yb3+by the imprinted material is conformed to the Langmuir model;The equilibrium can basically be reached in 40 min,and the adsorption process can be described using the pseudo-second-order kinetic model. Yb( Ⅲ)-ⅡP-PEI/MCM-41 has strong selectivity toward Yb3+and also has good recyclability.This adsorbent with high adsorption capacity and high selectivity for rare earth Yb ions combining the advantages of MCM-41 and ion-imprinted polymer thus-prepared lays the foundation for further application in the separation and recovery of low-concentration earth elements from wastewater.

关 键 词：镱离子 离子印迹聚合物 MCM-41分子筛 聚乙烯亚胺 

分 类 号：O616[理学—无机化学]