ZnO修饰的不锈钢网支撑体上ZIF-8膜的制备
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摘要
ZIF-8因具有0.34 nm的孔道直径而被认为是最具应用前景的气体分离膜材料之一。不锈钢网(SSN)作为分离膜的支撑体具有价格低廉、易于裁剪、厚度薄等优点。采用水热法在SSN表面生长ZnO缓冲层,以ZnO修饰的SSN(ZnO/SSN)为支撑体制备ZIF-8膜。采用X射线衍射(XRD)和扫描电子显微镜(SEM)对合成的ZIF-8膜进行表征,并进行了气体渗透性能测试,结果表明,在ZnO颗粒修饰后的SSN支撑体上无需活化可制备出单一物相、无缺陷的ZIF-8膜;在室温(298 K)下,ZIF-8膜的H2/CO2、H2/N2、H2/CH4的理想分离系数分别为7.3、9.2、12.4;在150℃,ZIF-8膜的渗透性能稳定。
ZIF-8 is one of the most perspective membrane materials for gas separation due to its regular pore size of 0.34 nm. Stainless steel nets(SSN) have the advantages of low price, easy cutting, and thin thickness as membrane substrates. In this work, ZnO buffering layer was synthesized on SSN substrate by hydrothermal method. ZIF-8 membranes were prepared on the ZnO modified SSN(ZnO/SSN) supports. ZnO/SSN supported ZIF-8 membranes were characterized by X ray diffraction(XRD) and scanning electron microscopy(SEM). The gas separation property of prepared ZIF-8 membranes was carried out. It is indicated that phase-pure and defect-free ZIF-8 membrane can be obtained on the ZnO/SSN substrate without additional activation step of ZnO layer. The ideal separation factors of H_2/CO_2, H_2/N_2 and H_2/CH_4 were 7.3, 9.2 and 12.4 at room temperature. The membrane demonstrates a good stability of permeability at 150℃.
ZIF-8 is one of the most perspective membrane materials for gas separation due to its regular pore size of 0.34 nm. Stainless steel nets(SSN) have the advantages of low price, easy cutting, and thin thickness as membrane substrates. In this work, ZnO buffering layer was synthesized on SSN substrate by hydrothermal method. ZIF-8 membranes were prepared on the ZnO modified SSN(ZnO/SSN) supports. ZnO/SSN supported ZIF-8 membranes were characterized by X ray diffraction(XRD) and scanning electron microscopy(SEM). The gas separation property of prepared ZIF-8 membranes was carried out. It is indicated that phase-pure and defect-free ZIF-8 membrane can be obtained on the ZnO/SSN substrate without additional activation step of ZnO layer. The ideal separation factors of H_2/CO_2, H_2/N_2 and H_2/CH_4 were 7.3, 9.2 and 12.4 at room temperature. The membrane demonstrates a good stability of permeability at 150℃.
引文
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[25]RUAN X,ZHANG X,LIAO X,et al.Enhancing mechanical stability and uniformity of 2-D continuous ZIF-8 membranes by Zn(Ⅱ)-doped polydopamine modification[J].Journal of Membrane Science,2017,541(1):101-107.
[26]LI W,MENG Q,LI X,et al.Non-activation Zn O array as a buffering layer to fabricate strongly adhesive metal-organic framework/PVDF hollow fiber membranes[J].Chemical Communications,2014,50(68):9711-9713.
[27]LIU Q,WANG N,CARO J,et al.Bio-inspired polydopamine:a versatile and powerful platform for covalent synthesis of molecular sieve membranes[J].Journal of the American Chemical Society,2013,135(47):17679-17682.
[28]ZHANG X,LIU Y,KONG L,et al.A simple and scalable method for preparing low-defect ZIF-8 tubular membranes[J].Journal of Materials Chemistry A,2013,1(36):10635-10638.
[29]ZHAN W,KUANG Q,ZHOU J,et al.Semiconductor@metal-organic framework core-shell heterostructures:a case of Zn O@ZIF-8 nanorods with selective photoelectrochemical response[J].Journal of the American Chemical Society,2013,135(5):1926-1933.
[30]FAIREN-JIMENEZ D,MOGGACH S A,WHARMBY M T,et al.Opening the gate:framework flexibility in ZIF-8 explored by experiments and simulations[J].Journal of the American Chemical Society,2011,133(23):8900-8902.
[2]SEO J S,WHANG D,LEE H,et al.A homochiral metal-organic porous material for enantioselective separation and catalysis[J].Nature,2000,404(6781):982-986.
[3]MURRAY L J,DINCA M,LONG J R.Hydrogen storage in metalorganic frameworks[J].Chemical Society Reviews,2009,38(5):1294-1314.
[4]YAGHI O M,O'KEEFFE M,OCKWIG N W,et al.Reticular synthesis and the design of new materials[J].Nature,2003,423(6941):705-714.
[5]LI J R,KUPPLER R J,ZHOU H C.Selective gas adsorption and separation in metal-organic frameworks[J].Chemical Society Reviews,2009,38(5):1477-1504.
[6]PARK K S,NI Z,COTE A P,et al.Exceptional chemical and thermal stability of zeolitic imidazolate frameworks[J].Proceedings of the National Academy of Sciences,2006,103(27):10186-10191.
[7]PHAN A,DOONAN C J,URIBE-ROMO F J,et al.Synthesis,structure,and carbon dioxide capture properties of zeolitic imidazolate frameworks[J].Acc.Chem.Res.,2010,43(1):58-67.
[8]YAO J,WANG H.Zeolitic imidazolate framework composite membranes and thin films:synthesis and applications[J].Chemical Society Reviews,2014,43(13):4470-4493.
[9]HARA N,YOSHIMUNE M,NEGISHI H,et al.Diffusive separation of propylene/propane with ZIF-8 membranes[J].Journal of Membrane Science,2014,450(15):215-223.
[10]HUANG K,DONG Z,LI Q,et al.Growth of a ZIF-8 membrane on the inner-surface of a ceramic hollow fiber via cycling precursors[J].Chemical Communications,2013,49(87):10326-10328.
[11]KWON H T,JEONG H K.Improving propylene/propane separation performance of zeolitic-imidazolate framework ZIF-8 Membranes[J].Chemical Engineering Science,2015,124(3):20-26.
[12]KWON H T,JEONG H K.Highly propylene-selective supported zeolite-imidazolate framework(ZIF-8)membranes synthesized by rapid microwave-assisted seeding and secondary growth[J].Chemical Communications,2013,49(37):3854-3856.
[13]KWON H T,JEONG H K.In situ synthesis of thin zeolitic-imidazolate framework ZIF-8 membranes exhibiting exceptionally high propylene/propane separation[J].Journal of the American Chemical Society,2013,135(29):10763-10768.
[14]LI L,YAO J,CHEN R,et al.Infiltration of precursors into a porous alumina support for ZIF-8 membrane synthesis[J].Microporous and Mesoporous Materials,2013,168(1):15-18.
[15]PAN Y,LAI Z.Sharp separation of C2/C3 hydrocarbon mixtures by zeolitic imidazolate framework-8(ZIF-8)membranes synthesized in aqueous solutions[J].Chemical Communications,2011,47(37):10275-10277.
[16]PAN Y,LI T,LESTARI G,et al.Effective separation of propylene/propane binary mixtures by ZIF-8 membranes[J].Journal of membrane science,2012,390(15):93-98.
[17]XU G,YAO J,WANG K,et al.Preparation of ZIF-8 membranes supported on ceramic hollow fibers from a concentrated synthesis gel[J].Journal of Membrane Science,2011,385(1):187-193.
[18]ZHU Y,LIU Q,CARO J,et al.Highly hydrogen-permselective zeolitic imidazolate framework ZIF-8 membranes prepared on coarse and macroporous tubes through repeated synthesis[J].Separation and Purification Technology,2015,146(26):68-74.
[19]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.
[20]JANG E,KIM E,KIM H,et al.Formation of ZIF-8 membranes inside porous supports for improving both their H2/CO2 separation performance and thermal/mechanical stability[J].Journal of Membrane Science,2017,540(15):430-439.
[21]ZHANG H,JAMES J,ZHAO M,et al.Improving hydrostability of ZIF-8 membranes via surface ligand exchange[J].Journal of Membrane Science,2017,532(15):1-8.
[22]KONG L,ZHANG X,LIU H,et al.Synthesis of a highly stable ZIF-8 membrane on a macroporous ceramic tube by manual-rubbing Zn O deposition as a multifunctional layer[J].Journal of Membrane Science,2015,490(15):354-363.
[23]ZHANG X,LIU Y,LI S,et al.New membrane architecture with high performance:ZIF-8 membrane supported on vertically aligned Zn O nanorods for gas permeation and separation[J].Chemistry of Materials,2014,26(5):1975-1981.
[24]HUANG A,LIU Q,WANG N,et al.Highly hydrogen permselective ZIF-8 membranes supported on polydopamine functionalized macroporous stainless-steel-nets[J].Journal of Materials Chemistry A,2014,2(22):8246-8251.
[25]RUAN X,ZHANG X,LIAO X,et al.Enhancing mechanical stability and uniformity of 2-D continuous ZIF-8 membranes by Zn(Ⅱ)-doped polydopamine modification[J].Journal of Membrane Science,2017,541(1):101-107.
[26]LI W,MENG Q,LI X,et al.Non-activation Zn O array as a buffering layer to fabricate strongly adhesive metal-organic framework/PVDF hollow fiber membranes[J].Chemical Communications,2014,50(68):9711-9713.
[27]LIU Q,WANG N,CARO J,et al.Bio-inspired polydopamine:a versatile and powerful platform for covalent synthesis of molecular sieve membranes[J].Journal of the American Chemical Society,2013,135(47):17679-17682.
[28]ZHANG X,LIU Y,KONG L,et al.A simple and scalable method for preparing low-defect ZIF-8 tubular membranes[J].Journal of Materials Chemistry A,2013,1(36):10635-10638.
[29]ZHAN W,KUANG Q,ZHOU J,et al.Semiconductor@metal-organic framework core-shell heterostructures:a case of Zn O@ZIF-8 nanorods with selective photoelectrochemical response[J].Journal of the American Chemical Society,2013,135(5):1926-1933.
[30]FAIREN-JIMENEZ D,MOGGACH S A,WHARMBY M T,et al.Opening the gate:framework flexibility in ZIF-8 explored by experiments and simulations[J].Journal of the American Chemical Society,2011,133(23):8900-8902.
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