化工学报 ›› 2017, Vol. 68 ›› Issue (5): 1940-1945.DOI: 10.11949/j.issn.0438-1157.20161156

• 分离工程 • 上一篇    下一篇

黄腐酸基Cd2+离子印迹聚合物的吸附性能测试

尚宏周, 赵敬东, 何俊男, 孙晓然   

  1. 华北理工大学化学工程学院, 河北 唐山 063210
  • 收稿日期:2016-08-18 修回日期:2017-02-17 出版日期:2017-05-05 发布日期:2017-05-05
  • 通讯作者: 尚宏周
  • 基金资助:

    河北省自然科学基金项目(B2014209200)。

Absorption properties of Cd2+ ion imprinted poly(fulvic acid)

SHANG Hongzhou, ZHAO Jingdong, HE Junnan, SUN Xiaoran   

  1. College of Chemical Engineering, North China University of Science and Technology, Tangshan 063210, Hebei, China
  • Received:2016-08-18 Revised:2017-02-17 Online:2017-05-05 Published:2017-05-05
  • Supported by:

    supported by the National Natural Science Foundation of Hebei Province (B2014209200).

摘要:

以改性黄腐酸为功能单体,反相悬浮聚合法制备了Cd2+离子印迹聚合物,并研究其吸附性能。动力学模型表明,黄腐酸基Cd2+离子印迹聚合物对Cd2+的吸附符合准二级动力学吸附模型,相关系数达到0.9977;热力学研究发现,黄腐酸基Cd2+离子印迹聚合物吸附重金属离子的形式为单分子层表面吸附,与Langmuir等温吸附模型相符;竞争吸附实验显示,竞争离子Pb2+、Cr3+存在时,Cd2+/Pb2+、Cd2+/Cr3+的相对选择性系数分别为4.32、13.47,说明MFA-IIP对模板离子拥有较强的选择识别性能,竞争离子化合价不同,选择识别性更加显著。

关键词: 离子印迹, 改性黄腐酸, 吸附剂, 动力学, 热力学

Abstract:

Cd2+ ion imprinted polymer (MFA-IIP) was synthesized by inverse suspension copolymerization of modified fulvic acid monomer. Adsorption study showed that adsorption kinetics of MFA-IIP to Cd2+ is in accordance with pseudo-second-order kinetic model with correlation coefficient of 0.9977. The adsorption of heavy metal ions on MFA-IIP polymer thermodynamically follows single-molecule surface Langmuir adsorption model. In presence of competitive Pb2+ and Cr3+ ions, the polymer exhibited strong selection and recognition to template ion with relative selectivity coefficient of Cd2+/Pb2+ and Cd2+/Cr3+ at 4.32 and 13.47, respectively. When other metal ions with different valences existed in aqueous solution, selective recognition of MFA-IIP polymer to Cd2+ would be much more obvious.

Key words: ion imprinted, modified fulvic acid, adsorbents, kinetics, thermodynamics

中图分类号: