Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
College of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China.
Molecules. 2023 Mar 24;28(7):2934. doi: 10.3390/molecules28072934.
Two new inorganic-organic hybrid crystals based on PbI were assembled through the solvent evaporation method, namely, {[L1]·[PbI]} () and {[L2]·[PbI]} (). L1-L2 are a series of multivalent nitrogen-containing cationic ligands. Compounds - were characterized by single-crystal X-ray diffraction, elemental analysis, FT-IR, powder X-ray diffraction, and thermogravimetric microanalysis. The results showed that the adsorption rate of 80 mg compound to iodine reached 96.59%, indicating a high iodine capture performance in cyclohexane solution. In the meantime, the adsorption kinetics is most suitable for a pseudo-second-order model, and the adsorption process is mainly chemisorption. Adsorption thermodynamics is most suitable for the Langmuir model, indicating that adsorption occurs on the surface of the monolayer. According to the adsorption mechanism, it can be inferred that the structure of compound contains amino, benzene, N heterocyclic, and other active groups, that is, indirectly increases the adsorption site with iodine, and the chemical reaction with iodine improves the removal rate of iodine in cyclohexane solution. In addition, compound was found to have good iodine adsorption and recyclability by cyclic experiments. Therefore, the synthesized compound can be used as a potential and excellent iodide capture adsorbent, which may have a good application prospects in the future.
通过溶剂挥发法组装了两个基于 PbI 的新型无机-有机杂化晶体，即 {[L1]·[PbI]}() 和 {[L2]·[PbI]}()。L1-L2 是一系列多价含氮阳离子配体。通过单晶 X 射线衍射、元素分析、FT-IR、粉末 X 射线衍射和热重微量分析对化合物 - 进行了表征。结果表明，80mg 化合物对碘的吸附率达到 96.59%，表明其在环己烷溶液中具有较高的碘捕获性能。同时，吸附动力学最适合准二级模型，吸附过程主要是化学吸附。吸附热力学最适合 Langmuir 模型，表明吸附发生在单层表面。根据吸附机理，可以推断出化合物的结构中含有氨基、苯、N 杂环等活性基团，即间接增加了与碘的吸附位，与碘的化学反应提高了环己烷溶液中碘的去除率。此外，通过循环实验发现化合物对碘具有良好的吸附和可回收性。因此，合成的化合物可以作为一种潜在的、优异的碘捕获吸附剂，在未来可能具有良好的应用前景。
