Acta Chimica Sinica ›› 2010, Vol. 68 ›› Issue (11): 1109-1118. Previous Articles     Next Articles

Full Papers

采用新型离子表面印迹材料在皮米尺度上对相邻稀土离子进行识别分离的研究

高学超, 高保娇, 牛庆媛, 赵婧   

  1. 中北大学化学工程系 太原 030051
  • 收稿日期:2009-10-19 修回日期:2009-12-14 出版日期:2010-06-14 发布日期:2010-01-16
  • 通讯作者: 高保娇 E-mail:gaobaojiao@126.com;gaobaojiao@sohu.com

Studies on Recognition and Separation of Neighbor Rare Earth Ions on Scale of Picometer Using Novel Surface Ion-Imprinted Material

GAO Xue-Chao, GAO Bao-Jiao, NIU Qing-Yuan, ZHAO Jing   

  1. Chemical Engineering Department, North University of China, Taiyuan 030051
  • Received:2009-10-19 Revised:2009-12-14 Online:2010-06-14 Published:2010-01-16

Acrylonitrile (AN) was graft-polymerized on micron-sized silicon particles, resulting in grafted particles PAN/SiO2. Subsequently, the grafted PAN was converted to poly(amidoxime) (PAO) via amidoximation reaction, obtaining functional particles PAO/SiO2. Then, the ionic imprinting towards the grafted PAO was performed with Gd3+ ion as template ion and glutaral as crosslinking agent by using the novel surface-molecular imprinting technique established by our research group, and the Gd3+ ion-imprinted material IIP-PAO/SiO2 was prepared. Rare earth element Eu and Sm are adjacent to Gd in lanthanum elements, and the ionic radius difference between Eu3+ and Sm3+ ions and Gd3+ ion is only 1~3 pm. In this work, with Eu3+ and Sm3+ ions as contrast substances, both static and dynamic methods were adopted to study the binding properties and ion recognition character of IIP-PAO/SiO2 for Gd3+ ion. The experiment results show that IIP-PAO/SiO2 have specific recognition selectivity and excellent binding affinity for Gd3+ ion, and the selectivity coefficients of IIP-PAO/SiO2 for Gd3+ ion with respect of Eu3+ ion and Sm3+ ion are 7.49 and 7.93, respectively. Besides, IIP-PAO/SiO2 has excellent elution property, with diluted HCl solution as eluent, the desorption ratios of Gd3+ ion reach 99.54% in 29 BV.

Key words: poly(amidoxime), silica gel, ionic imprinting, surface imprinting, rare earth ion, ion recognition