Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (2): 203-211.DOI: 10.11944/j.issn.1000-0518.2019.02.180110

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

LI Xiancai(),TIAN Minglei,CHENG Yuwen,WANG Xiu   

  1. College of Chemistry,Nanchang University,Nanchang 330031,China
  • Received:2018-04-13 Online:2019-02-01 Published:2019-01-31
  • Contact: LI Xiancai
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.51664042)

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