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

doi:10.11944/j.issn.1000-0518.2019.02.180110

摘要/Abstract

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Yb³⁺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Yb³⁺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Yb³⁺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Yb³⁺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。

关键词: 镱离子, 离子印迹聚合物, MCM-41分子筛, 聚乙烯亚胺

Abstract:

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.

Key words: ytterbium ion, ion imprinted polymer, MCM-41 molecular sieve, polyethylenimine

黎先财, 田明磊, 程玉雯, 汪秀. 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[J]. 应用化学, 2019, 36(2): 203-211.

LI Xiancai, TIAN Minglei, CHENG Yuwen, WANG Xiu. Preparation and Characterization of Yb Ion-Imprinted Polymers Based on MCM-41 Molecular Sieve Surface[J]. Chinese Journal of Applied Chemistry, 2019, 36(2): 203-211.

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