疏水性高分子/ZIF杂化膜的改性、制备及渗透汽化脱醇的应用研究

渗透汽化膜分离技术在生物醇类燃料的分离回收领域有着广泛的应用前景，而疏水性渗透汽化膜是决定其分离性能的关键因素。沸石咪唑酯骨架结构(ZIF)材料，因其均一稳定的多孔结构、优异的化学和热稳定性，近年来在膜分离领域表现出巨大的应用潜力，但其颗粒团聚及与高分子体系的相分离现象仍然是其面临的主要问题。本项目拟重点研发新型疏水性高分子/ZIF杂化膜并克服两者的相分离问题，实现生物醇类回收的高效渗透汽化分离。我们拟通过对ZIF纳米颗粒的表面化学改性，接枝疏水性有机硅氧烷、长链烷烃或含氟基团，增强其疏水性，并使其与高分子体系之间产生一定的化学键、氢键或其它分子间作用力；并通过物理共混、原位生长或表面接枝的方式制备更均匀稳定的高分子/ZIF杂化膜，改善ZIF纳米颗粒与高分子相间的亲和性，实现生物醇类的高效渗透汽化回收和分离。

Pervaporation technology has wide applications in the reconcentration of bioalcohol separations, while the lack of suitable hydrophobic membranes is always the critical issue limiting its development. Zeolitic imidazolate framework (ZIF) material, for its highly porous and crystalline structure, excellent chemical, thermal and mechanical stabilities, has shown its great potential in the membrane separation field in recent years. However, the agglomeration phenomenon of ZIF nanoparticles and the phase separation with the polymer matrix is still one of the main challenges for ZIF-based hybrid membranes. This project aims to develop novel hydrophobic polymer/ZIF hybrid membranes with a good miscibility between the two phases, and achieve a high separation efficiency for the bioethanol recovery via pervaporation. Chemical modification will be performed to graft hydrophobic siloxane groups, long-chain alkyl groups or fluorine-containing groups onto ZIF nanoparticles, to achieve the higher hydrophobicity of ZIF particles, as well as a stable chemical bonding, hydrogen bonding or other molecular interactions between the polymer and ZIF nanoparticles. Polymer/ZIF hybrid membranes will be fabricated via physical blending, in-situ growth of ZIF nanoparticles or surface grafting strategies, to result in the hybrid membranes with a better homogeneity and good stability, in order to achieve the enhanced separation performance for alcohol recovery.