Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Shandong Provincial Key Laboratory of Coastal Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences , Yantai 264003, China.
ACS Appl Mater Interfaces. 2014 Jan 8;6(1):305-13. doi: 10.1021/am4042405. Epub 2013 Dec 24.
A novel kind of Pb(2+) ion imprinted polymers (IIPs) was prepared based on ionic interactions via the synergy of dual functional monomers of methacrylic acid and vinyl pyridine for selective solid-phase extraction (SPE) of Pb(2+) in water samples. Suspension polymerization was employed for the formation of template Pb(2+)/monomer complex by self-assembly in the presence of ethylene glycol dimethacrylate cross-linker. The resulted Pb(2+) IIPs showed fast kinetics, high binding capacity, and the adsorption processes obeyed intraparticle diffusion kinetics and Langmuir isotherm models. The IIPs displayed excellent selectivity toward Pb(2+) over other metal ions such as Cu(2+), Cd(2+), Zn(2+), and Mn(2+) with selective coefficients above 30, as well as high anti-interference ability for Pb(2+) confronting with common coexisting various ions. Through 10 adsorption-desorption cycles, the reusable IIPs exhibited a good recoverability with the standard error within 5%. These features suggested the IIPs were ideal candidates for extraction and removal of Pb(2+) ions. Consequently, the IIPs were utilized as SPE sorbents and related parameters were optimized. An excellent linearity was presented in the range of 0.2-50 μg L(-1) (R(2) = 0.9998), as well as the limits of detection and quantification were achieved of 0.06 and 0.19 μg L(-1), respectively. A good repeatability was obtained with the relative standard deviation of 2.8%. Furthermore, real water samples were successfully analyzed and satisfactory recoveries varying from 95.5 to 104.6% were attained. The IIPs-SPE demonstrated potential application perspectives for rapid and high-effective cleanup and enrichment of trace Pb(2+) ions in complicated matrices.
一种新型的 Pb(2+) 离子印迹聚合物（IIPs）是通过协同两种功能单体甲基丙烯酸和乙烯基吡啶的离子相互作用，基于离子相互作用，用于选择性固相萃取（SPE）水样中的 Pb(2+)。悬浮聚合在乙二醇二甲基丙烯酸酯交联剂存在下通过自组装形成模板 Pb(2+)/单体配合物。所得的 Pb(2+)IIPs 表现出快速动力学、高结合容量，吸附过程符合内扩散动力学和 Langmuir 等温线模型。IIPs 对 Pb(2+)具有出色的选择性，对其他金属离子（如 Cu(2+)、Cd(2+)、Zn(2+)和 Mn(2+)）的选择性系数均高于 30，并且对 Pb(2+)具有高抗干扰能力，可与常见共存的各种离子共存。经过 10 次吸附-解吸循环，可重复使用的 IIPs 表现出良好的可回收性，标准误差在 5%以内。这些特性表明，IIPs 是提取和去除 Pb(2+)离子的理想候选物。因此，将 IIPs 用作 SPE 吸附剂并优化了相关参数。在 0.2-50μg L(-1)范围内呈现出优异的线性（R(2) = 0.9998），检出限和定量限分别达到 0.06 和 0.19μg L(-1)。重复性良好，相对标准偏差为 2.8%。此外，成功分析了实际水样，获得了 95.5%至 104.6%的回收率。IIPs-SPE 为快速、高效地净化和富集复杂基质中痕量 Pb(2+)离子提供了潜在的应用前景。
