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- 저자 : Tsapatsis, Michael (검색결과 3 건)
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직접 합성된 제올라이트 나노쉬트를 이용한 고선택성 MFI 분리막 제조
이평수,박유인,전미영,김동훈,Michael Tsapatsis 한국막학회 2017 한국막학회 총회 및 학술발표회 Vol.2017 No.11
Until now, single MFI nanosheets have been prepared using a multi-step approach based on the exfoliation of layered MFI, followed by centrifugation to remove nonexfoliated particles. This top-down method is time-consuming, costly and low-yield and it produces fragmented nanosheets with sub micrometre lateral dimensions. Alternatively, direct (bottom-up) synthesis could produce high-aspect-ratio zeolite nanosheets, with improved yield and at lower cost. Here we use a nanocrystal-seeded growth method triggered by a single rotational intergrowth to synthesize high-aspect-ratio MFI nanosheets with a thickness of 5 nanometres (2.5 unit cells). These high-aspect-ratio nanosheets allow the fabrication of thin and defect-free coatings that effectively cover porous substrates. These coatings can be intergrown to produce high-flux and ultra-selective MFI membranes that compare favourably with other MFI membranes prepared from existing MFI materials (such as exfoliated nanosheets or nanocrystals).
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Continuous ZIF-8/reduced graphene oxide nanocoating for ultrafast oil/water separation
Kim, Dae Woo,Eum, Kiwon,Kim, Hanim,Kim, Daeok,Mello, Matheus Dorneles de,Park, Kangho,Tsapatsis, Michael Elsevier 2019 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.372 No.-
<P><B>Abstract</B></P> <P>Continuous ZIF-8/reduced graphene oxide (RGO) nanocoating is fabricated by growing ZIF-8 on RGO-coated polyurethane (PU) foam. Surface modification of PU foam can be easily achieved by immersing the PU foam in GO solution, followed by mild thermal treatment to turn the GO layer into RGO layer. Adhesion between polymer foam and ZIF-8 layer was enhanced by the inserted RGO layer because oxygen-containing groups of RGO could interact with Zn<SUP>2+</SUP> precursor of ZIF-8 localizing the layer growth preferentially on the surface of RGO. The synergetic hydrophobic/oleophilic properties of RGO and ZIF-8 enable selective oil absorption of PU foam with an absorption capacity of 15–35 g/g depending on the viscosity of organic solvents. Most of all, the ZIF-8/RGO coated PU foam can filter organic solvent selectively <I>via</I> vacuum filtration, showing ultrafast hexane flux up to 800,000 Lm<SUP>−2</SUP> h<SUP>−1</SUP> and no water flux.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A method to fabricate continuous hydrophobic/oleophilic RGO/ZIF-8 nanocoating on polymeric foam. </LI> <LI> Selective oil absorption with an absorption capacity of 15–35 g/g depending on the viscosity of organic solvents. </LI> <LI> Ultrafast hexane flux up to 800,000 Lm<SUP>−2</SUP> h<SUP>−1</SUP> and no water flux during vacuum filtration. </LI> <LI> Universal method to fabricate metal-organic frameworks on polymeric foam. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Xu, Dandan,Abdelrahman, Omar,Ahn, Sang Hyun,Guefrachi, Yasmine,Kuznetsov, Anatoliy,Ren, Limin,Hwang, Sonjong,Khaleel, Maryam,Al Hassan, Saeed,Liu, Dongxia,Hong, Suk Bong,Dauenhauer, Paul,Tsapatsis, Mi John Wiley Sons, Inc. 2019 AIChE journal Vol.65 No.3
<P>Micro/meso/macroporous (hierarchical) zeolites show remarkable catalytic performance for reactions involving bulky reactants. However, quantitative assessment of the microstructural characteristics contributing to the observed performance remains elusive. Here, structure–activity relationships are established for a set of micro/mesoporous self‐pillared pentasil (SPP) zeolites using two parallel liquid‐phase reactions (benzyl alcohol alkylation and self‐etherification) based on analysis of mass transport and reaction kinetics. A reaction–diffusion mathematical model is developed that quantitatively assigns the catalytic contributions of the external surface and micropores of SPP zeolites for these reactions. In addition, the effect of the zeolite external surface structure on the corresponding catalytic activity is quantitatively assessed by comparing SPP zeolites (with MFI structure) with MCM‐22 (with MWW structure). This work demonstrates that reaction–diffusion modeling allows quantitative description of the catalytic performance of hierarchical zeolites and provides a model reaction to assess nm‐sized characteristic diffusion lengths in MFI. © 2018 American Institute of Chemical Engineers <I>AIChE J</I>, 65: 1067–1075, 2019</P>
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