Nanoporous Supramolecular Liquid Crystal Polymeric Material for Specific and Selective Uptake of Melamine
Nanoporous Supramolecular Liquid Crystal Polymeric Material for Specific and Selective Uptake of Melamine
复制标题
DOI：
10.1021/acs.macromol.0c00322
复制
发表时间：
2020-06-09
期刊：
影响因子：
5.5
通讯作者：
Yang, Hong
中科院分区：
文献类型：
--
作者：
Nie, Zhen-Zhou;Zuo, Bo;Yang, Hong
氢键超分子液晶复合物衍生的纳米孔材料在选择性吸附、水脱盐、离子导电等方面具有广阔的应用前景，但对一些具有高度自互补性的氢键杂环化合物（如，三聚氰胺）对于广泛使用的羧酸型分散型液晶来说极难竞争性地结合并且仍然具有挑战性。在这里，我们报告了一种基于光交联的三聚氰胺/胸腺嘧啶衍生物超分子结构的纳米多孔超分子液晶聚合物材料，它可以特异性地识别和选择性地吸收溶液中的三聚氰胺。超分子聚合物材料的六方柱状纳米通道中的小孔径、特定的氢键位点和强系统结合赋予其一系列上级的性质，包括高度竞争性的三聚氰胺吸收、即使在恶劣环境中也稳定的吸附以及良好的吸附可回收性。此外，还研究了该超分子材料对三聚氰胺的吸附能力和吸附动力学，确定了该纳米多孔液晶高分子材料对三聚氰胺的吸附动力学符合Lagergren准二级动力学模型。
Nanoporous materials derived from hydrogen-bonded supramolecular liquid crystal complexes present a promising and prevalent perspective in selective adsorption, water desalination, ion conductivity, and so on. However, the specific recognition and selective uptake of some highly self-complementary hydrogen-bonded heterocyclic compounds (e.g., melamine) are extremely difficult for the widely used carboxylic acid-type discotic liquid crystals to competitively bind and remain challenging. Here, we report a nanoporous supramolecular liquid crystal polymeric material built on a photo-cross-linked melamine/thymine-derivative supramolecular structure, which can specifically recognize and selectively absorb melamine from solutions. The small pore diameter, specific hydrogen-bonded sites, and strong systematic binding in the hexagonal columnar nanochannels of the supramolecular polymeric material endow itself with a series of superior properties, including highly competitive uptake of melamine, stable adsorption even in harsh environments, and good adsorption recyclability. Moreover, the melamine adsorption capacity and kinetics of the supramolecular material are also investigated, which determines that the adsorption kinetics of the nanoporous liquid crystal polymeric material follow the Lagergren pseudo-second-order kinetic model.