ZIF-8在纳米复合膜中的应用
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- 英文论文题名：Applications of ZIF-8 in Thin Film Nanocomposite Membranes
- 论文作者：李雁博
- 英文论文作者：Yanbo Li ; Wuhan Institute of Technology ; School of Chemical Engineering and Pharmacy
- 年：2016
- 作者机构：武汉工程大学化工与制药学院;
- 论文关键词：ZIF-8 ; 薄层纳米复合膜 ; 薄层复合膜 ; 纳滤
- 英文论文关键词：ZIF-8 ; thin film composite membranes ; thin film nanocomposite membranes ; nanofiltrations
- 会议召开时间：2016-10-14
- 会议录名称：第二届湖北省化学化工青年科学家论坛摘要集
- 语种：中文
- 分类号：O641.4;TB383.2
- 学会代码：HXGC
- 会议名称：第二届湖北省化学化工青年科学家论坛
- 会议地点：中国湖北武汉
- 主办单位：湖北省化学化工学会
- 学会名称：《化学与生物工程》编辑部
- 页数：3
- 文件大小：95k
- 原文格式：D
- 会议级别：地方
摘要
沸石咪唑酯骨架材料(ZIFs)是金属有机框架化合物(MOFs)材料的一类,它是由过渡金属原子(Zn/Co)与咪唑或咪唑衍生物连接而生成的一类新型的、具有沸石拓扑结构的纳米多孔材料。ZIFs具有优良的热和水热稳定。ZIF-8是ZIFs材料中最具有代表性的一种,ZIF-8具有SOD拓扑结构。由金属Zn离子与甲基咪唑酯中的N原子相连形成的Zn N4四面体结构单元构成,每个单元晶胞包含2个SOD笼,直径为1.16 nm,每个SOD笼通过6个Zn原子组成的六元环笼口相连,六元环笼口直径为0.34 nm~([1-2])。ZIF-8中含有有机配体,和有机聚合物有较好的相容性,再加上ZIF-8特有的孔道结构和孔道性质,使其在膜分离领域有广泛应用~([3-6])。薄层复合膜(TFC)备受关注~([7]),其制备方法多样。近年来研究者提出薄层纳米复合膜(TFN),通过在分离层中引入多孔材料,增加过滤通道,减小分离层的传质阻力~([8-9])。本研究尝试利用不同的方法制备不同类型的基于ZIF-8的薄层纳米复合膜,研究其纳滤性质,并探讨此类膜的应用。方法一、以聚醚砜超滤膜为基膜,利用界面合成发制备连续的ZIF-8纳滤膜,考查合成条件对纳滤膜性能的影响;方法二、以交联的聚酰亚胺超滤膜为基膜,制备含有介孔的ZIF-8(H-ZIF-8)为填充颗粒,利用界面聚合法合成基于聚酰胺和ZIF-8的杂化型复合纳滤膜,考查其在有机溶剂体系的分离性能和H-ZIF-8对分离性能的促进作用;方法三、以水解后的聚丙烯氰(PAN)超滤膜为基膜,通过界面合法成与电荷的相互作用耦合的方法合成基于超支化聚醚酰亚胺(PEI)和ZIF-8的杂化膜,考查ZIF-8对PEI/PAN复合纳滤膜性能的影响;实验结果表明:界面合成法制备连续的ZIF-8复合膜方法可行,通过优化其制备条件,可获得高通量纳滤膜,但是膜的稳定性有待进一步研究;在聚酰胺纳滤膜中引入H-ZIF-8颗粒后,可以增加纳滤膜的通量,但是取决于过滤溶剂的性质;界面合法成与电荷的相互作用耦合可以实现原位制备PEI-ZIF-8/PAN杂化复合纳滤膜,其性能较PEI/PAN提高一倍。
Zeolitic imidazolate frameworks(ZIFs), a sub-class of metal-organic framworks(MOFs) with zeolite-type tetrahedral topologies, are porous crystalmaterials constructed from tetrahedral metal ions(e.g., Zn, Co) bridged by imidazolates. ZIFs process of good thermal and hydrothermal stabilities. ZIF-8, a typical ZIF materials with SOD topology, is constructed from Zn(II) tetrahedrally coordinated by four 2-methylimidazolate linkers. ZIF-8 crystal lattice contains 2 SOD cages with a pore cavity of 1.16 nm in diameter. Every cage connects by 6-ring windows approximately 3.4 ? in diameter. ZIF-8 has wide applications in membrane separations due to its good compatibility with polymers and its special pore structure and properties. Thin film composite(TFC) membranes attracts many attentions. Recent years, researchers propose the concept of thin film nanocomposite(TFN) membranes, aiming at decreasing the mass transfer resistance by incorporating of porous materials into the selective layer of TFC membranes. Present study attempts to use different strategies to prepare ZIF-8 based TFN membranes and study their nanofiltration performance and the application possibilities. ⅠContinuous ZIF-8 membranes on PES unltrafiltration membranes preparedby an interfacial synthesis method were prepared and the influences of synthesis conditions on nanofiltration performance were studied. ⅡHierarchical ZIF-8(H-ZIF-8) were prepared and used as fillers. TFN membranes based on H-ZIF-8 and polyamide were synthesized on crosslinked polyimide supports and their organic solvent nanofiltration performance were investigated. ⅢHybrid membranes containing hyperbranched polyetherimide and ZIF-8 were prepared on hydrolyzed acrylonitrile supports by combining the electrostatic interaction and interfacial synthesis method. The effect of ZIF-8 on the PEI/PAN membrane nanofiltration performance were studied. The results indicates that interfacial synthesis method is feasible to prepare continuous ZIF-8 membrane. High flux ZIF-8 nanofiltration membranes can be prepared by optimizing the synthesis conditions. However, further study of long term stability of ZIF-8 membranes is required. H-ZIF-8 particles improved the nanofiltration performance of polyimide membrane, the flux improvement depends on the permeate solvent properties. Combining the interfacial synthesis method and electrostatic interaction can in-situ incorporation of the ZIF-8 into PEI membranes. The introduction of ZIF-8 can doubled the PEI/PAN membrane fluxes without changing the membrane rejection.
Zeolitic imidazolate frameworks(ZIFs), a sub-class of metal-organic framworks(MOFs) with zeolite-type tetrahedral topologies, are porous crystalmaterials constructed from tetrahedral metal ions(e.g., Zn, Co) bridged by imidazolates. ZIFs process of good thermal and hydrothermal stabilities. ZIF-8, a typical ZIF materials with SOD topology, is constructed from Zn(II) tetrahedrally coordinated by four 2-methylimidazolate linkers. ZIF-8 crystal lattice contains 2 SOD cages with a pore cavity of 1.16 nm in diameter. Every cage connects by 6-ring windows approximately 3.4 ? in diameter. ZIF-8 has wide applications in membrane separations due to its good compatibility with polymers and its special pore structure and properties. Thin film composite(TFC) membranes attracts many attentions. Recent years, researchers propose the concept of thin film nanocomposite(TFN) membranes, aiming at decreasing the mass transfer resistance by incorporating of porous materials into the selective layer of TFC membranes. Present study attempts to use different strategies to prepare ZIF-8 based TFN membranes and study their nanofiltration performance and the application possibilities. ⅠContinuous ZIF-8 membranes on PES unltrafiltration membranes preparedby an interfacial synthesis method were prepared and the influences of synthesis conditions on nanofiltration performance were studied. ⅡHierarchical ZIF-8(H-ZIF-8) were prepared and used as fillers. TFN membranes based on H-ZIF-8 and polyamide were synthesized on crosslinked polyimide supports and their organic solvent nanofiltration performance were investigated. ⅢHybrid membranes containing hyperbranched polyetherimide and ZIF-8 were prepared on hydrolyzed acrylonitrile supports by combining the electrostatic interaction and interfacial synthesis method. The effect of ZIF-8 on the PEI/PAN membrane nanofiltration performance were studied. The results indicates that interfacial synthesis method is feasible to prepare continuous ZIF-8 membrane. High flux ZIF-8 nanofiltration membranes can be prepared by optimizing the synthesis conditions. However, further study of long term stability of ZIF-8 membranes is required. H-ZIF-8 particles improved the nanofiltration performance of polyimide membrane, the flux improvement depends on the permeate solvent properties. Combining the interfacial synthesis method and electrostatic interaction can in-situ incorporation of the ZIF-8 into PEI membranes. The introduction of ZIF-8 can doubled the PEI/PAN membrane fluxes without changing the membrane rejection.
引文
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[5]Sorribas S,Gorgojo P,Téllez C,et al.High flux thin film nanocomposite membranes based on metal-organic frameworks for organic solvent nanofiltration[J].Journal of the American Chemical Society,2013,135(40):15201-15208.
[6]Venna S R,Carreon M A.Highly permeable zeolite imidazolate framework-8 membranes for CO2/CH4 separation[J].Journal of the American Chemical Society,2009,132(1):76-78.
[7]Lau W J,Ismail A F,Misdan N,et al.A recent progress in thin film composite membrane:a review[J].Desalination,2012,287:190-199.
[8]Lau W J,Gray S,Matsuura T,et al.A review on polyamide thin film nanocomposite(TFN)membranes:History,applications,challenges and approaches[J].water research,2015,80:306-324.
[9]Jeong B H,Hoek E M V,Yan Y,et al.Interfacial polymerization of thin film nanocomposites:a new concept for reverse osmosis membranes[J].Journal of Membrane Science,2007,294(1):1-7.
[2]Phan A,Doonan C J,Uribe-Romo F J,et al.Synthesis,structure,and carbon dioxide capture properties of zeoliticimidazolateframeworks[J].Acc.Chem.Res,2010,43(1):58-67.
[3]Song Q,Nataraj S K,Roussenova M V,et al.Zeoliticimidazolate framework(ZIF-8)based polymer nanocomposite membranes for gas separation[J].Energy&Environmental Science,2012,5(8):8359-8369.
[4]Shi G M,Yang T,Chung T S.Polybenzimidazole(PBI)/zeoliticimidazolate frameworks(ZIF-8)mixed matrix membranes for pervaporation dehydration of alcohols[J].Journal of membrane science,2012,415:577-586.
[5]Sorribas S,Gorgojo P,Téllez C,et al.High flux thin film nanocomposite membranes based on metal-organic frameworks for organic solvent nanofiltration[J].Journal of the American Chemical Society,2013,135(40):15201-15208.
[6]Venna S R,Carreon M A.Highly permeable zeolite imidazolate framework-8 membranes for CO2/CH4 separation[J].Journal of the American Chemical Society,2009,132(1):76-78.
[7]Lau W J,Ismail A F,Misdan N,et al.A recent progress in thin film composite membrane:a review[J].Desalination,2012,287:190-199.
[8]Lau W J,Gray S,Matsuura T,et al.A review on polyamide thin film nanocomposite(TFN)membranes:History,applications,challenges and approaches[J].water research,2015,80:306-324.
[9]Jeong B H,Hoek E M V,Yan Y,et al.Interfacial polymerization of thin film nanocomposites:a new concept for reverse osmosis membranes[J].Journal of Membrane Science,2007,294(1):1-7.