Department of Analytical Chemistry, University College of Science, University of Tehran, P.O. Box 14155-6455, Tehran, Iran.
Sci Rep. 2019 Jul 31;9(1):11130. doi: 10.1038/s41598-019-47648-w.
Ionic liquids (ILs) are a class of fluids with unique physicochemical properties employing polymeric substances emerging new materials. Solidification of ILs into porous materials generates porous ionic liquid polymers that combine the unique characteristics of ILs with common porous materials and polymers. In this study, it's the first time the porous ionic liquid polymer was chosen as a sorbent for extraction and speciation of nitrite and nitrate. Porous IL was prepared through polymerization of 1-allyl-3-methylimidazolium bromide monomers in the presence of azobisisobutyronitrile (AIBN) and crosslinking of ethylene glycol dimethyl acrylate (EGDMA). Parameters affecting the adsorbent performance were optimized. Under the optimal conditions, correlation coefficient (R) was 0.9996 and LOD was 0.1 µg L. This method presented the linearity in the concentration range between 0.1-100 µg L and the relative standard deviation was 3.2%. Finally, the adsorption behavior of the obtained sorbent for nitrate and nitrite determination in various real samples was evaluated. The result indicates that the porous ionic liquid polymer showed high adsorption capacity (233 mg g). The convenient preparation of the porous ionic liquid material, as well as high adsorption capacity for anionic pollutants predicted its broad application potential in anion removal materials.
离子液体（ILs）是一类具有独特物理化学性质的液体，采用聚合物质作为新兴材料。将 ILs 固化为多孔材料会生成多孔离子液体聚合物，这种聚合物结合了 ILs 的独特特性和常见的多孔材料及聚合物的特性。在本研究中，多孔离子液体聚合物首次被选为亚硝酸根和硝酸根的萃取和形态分析的吸附剂。通过在偶氮二异丁腈（AIBN）的存在下聚合 1-烯丙基-3-甲基咪唑溴化盐单体，并交联乙二醇二甲基丙烯酸酯（EGDMA），制备了多孔 IL。优化了影响吸附剂性能的参数。在最佳条件下，相关系数（R）为 0.9996，LOD 为 0.1μg/L。该方法在线性浓度范围为 0.1-100μg/L 内具有良好的线性关系，相对标准偏差为 3.2%。最后，评估了所得到的吸附剂在各种实际样品中对硝酸盐和亚硝酸盐测定的吸附行为。结果表明，多孔离子液体聚合物表现出高的吸附容量（233mg/g）。多孔离子液体材料的制备方便，对阴离子污染物的高吸附容量预示着其在阴离子去除材料中的广阔应用潜力。
