Aminosilane-functionalized ZIF-8/PEBA mixed matrix membrane for gas separation application

Amedi, Hamid Reza; Aghajani, Masoud

doi:10.1016/j.micromeso.2017.04.001

Cited by 92 publications

(49 citation statements)

References 35 publications

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“…The main summits denoted the increase in intensity for pure ZIF-8 at 2θ = 10.98°, 15.11°, 17.04°, 18.01°, 21.76°, 27.78°, and 29.05°, which corresponded to the 1833, 1840, 2800, 3710, 1388, 1504, and 2245 plates of the crystal face structure. In contrast, the intensity of lipase@ZIF-8 decreased due to the diminished distance between the atomic layers in the crystalline material and the decrease in crystallinity of RML@ZIF-8 after modification [25,26]. This result shows that the modification of the morphological properties of ZIF-8 resulted from the encapsulation of biomacromolecules (RML) (Figure 4).…”

Section: Introductionmentioning

confidence: 97%

X-Shaped ZIF-8 for Immobilization Rhizomucor miehei Lipase via Encapsulation and Its Application toward Biodiesel Production

Adnan

et al. 2018

Catalysts

109

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Abstract:This study presents a one-step encapsulation method for synthesizing X-shaped zeolitic imidazolate frameworks (ZIF-8) and immobilizing Rhizomucor miehei lipase (RML). We proved that the morphological structure of ZIF-8 had changed after immobilization with enhanced characterization using a field-emission scanning electron microscope, an energy-dispersive spectrometer, a transmission electron microscope, a Fourier transform infrared spectrometer, and powder X-ray diffraction. The surface area and pore size of the carrier were investigated before and after immobilization using Brunauer-Emmett-Teller and Barrett-Joyner-Halenda methods, respectively. RML@ZIF-8 exhibited high recovery activity of up to 2632%, representing a 26-fold increase in its free lipase. Encapsulated RML was used for biodiesel production from soybean oil in an isooctane system with a conversion yield of 95.6% under optimum conditions. The resulting reusability of the immobilized enzyme indicated no substantial decline in the conversion yield, which remained at 84.7% of the initial activity after 10 cycles. The stability and high performance of the immobilized enzyme are attributed to the harmony between RML and ZIF-8 based on the easy synthesis of ZIF-8 and the short time required to immobilize RML.

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Section: Introductionmentioning

confidence: 97%

X-Shaped ZIF-8 for Immobilization Rhizomucor miehei Lipase via Encapsulation and Its Application toward Biodiesel Production

Adnan

et al. 2018

Catalysts

109

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“…Polyether block amide (PEBA) is a block copolymer synthesized by pressurized polymerization with different grades of a rigid carboxylic acid polyamide (PA6, PA11, PA12) and flexible polyether to produce the ideal selection for CO 2 removal from natural gas and flue gases. The rigid PA segments provide the mechanical strength and the soft poly(ethylene oxide) (PEO) segments are responsible for the high permeability of the CO 2 molecules.…”

Section: Introductionmentioning

confidence: 99%

“…Gas separation by PEBA membranes is improved by incorporating inorganic filler. For example, to increase the permeability of CO 2 and selectivity for CO 2 /CH 4 , the addition of modified zeolite 4A, multi‐layer carbon nanotubes, ZIF‐7 and other fillers to the PEBA polymer matrix have been tested. Zinc oxide (ZnO) is a widely investigated nanomaterial that is commercially available, inexpensive, chemically stable, nontoxic, an electrochemical coupling coefficient and exhibits photostability and a broad range of radiation absorption levels.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the results of gas separation experiments, it was revealed that by increasing the PEBA percentage in PU/PEBA membranes, the permeability of all mentioned gases reduced whereas selectivity increased. The bilayer MMMs based on the PEBA containing ZIF‐8 nanomaterials, were synthesized and prepared by Ahmadi and Aghajani to separate CO 2 from CH 4 . To prevent the selectivity of these membranes from a drastic drop at high loading and agglomeration, the ZIF‐8 nanomaterials were modified using (3‐Aminopropyl) trimethoxysilane (APTMS) and triethoxysilane (APTES).…”

Section: Introductionmentioning

confidence: 99%

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Comparison of ZnO nanofillers of different shapes on physical, thermal and gas transport properties of PEBA membrane: experimental testing and molecular simulation

Asghari

Sheikh

Dehghani

2018

J of Chemical Tech & Biotech

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BACKGROUND PEBA and nano‐ZnO have been discussed for membrane modification and for gas separation in different studies and in mixed matrix membranes (i.e. PEBA/TiO2, PE/ZnO); however, no report has been published on the gas transport properties of ZnO/PEBA hybrid membranes. RESULTS Molecular simulation and experimental approaches were done using PEBA 1657 mixed matrix membranes (MMMs) loaded with ZnO nanorod‐ and nanosphere shaped nanomaterials at 0.5 wt% and 1 wt% loading to investigate the gas separation properties of these MMMs. Structural characterizationwas carried out by FESEM, AFM, BET and FTIR on synthesized membranes, and FFV and WAXD on the simulated membrane cells to study their structural properties. Thermal analysis was carried out by TGA, DMTA and calculation of the glass transition temperature to investigate the thermal properties of the MMMs. The results showed that the addition of ZnO filler significantly improved both the physical and thermal properties of the MMMs based on the characterization tests. The transport properties of the MMMs for three single light gas molecules (CO2, CH4 and N2) were investigated using experimental set‐up testing (permeability and selectivity), and also by molecular dynamic and Monte Carlo approaches in molecular simulation (diffusivity and solubility). The addition of ZnO nanomaterials in both shapes to the polymeric membrane significantly increased the transport properties; for example, CO2 permeability increased from 120 for membrane without nanomaterial to 135 barrer for membrane with 0.5 wt% of nanosphere ZnO and 157 barrer for membrane with 0.5 wt% nanorod ZnO. CONCLUSION The permeability of CH4 and N2 gases into all samples showed no significant change with an increase in pressure or ZnO loading which is likely due to the penetration paths in the membranes. The membrane with 1 wt% ZnO nanorods had the best performance in the Robeson upper bound 2008 diagram. This sample is thus suggested for industrial development. The simulation results showed a similar trend for the membranes and gas molecules, with an error of 25% to 65% from experimental results. We conclude that the PEBA/1 wt% ZnO nanorods membrane could be an ideal solid polymer membrane for gas separation applications. © 2018 Society of Chemical Industry

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“…For instance, imidazole functional groups were introduced onto the surface of Matrimid® molecules using 1‐(3‐amino‐propyl)‐imidazole as the linker to strengthen their chemical compatibility with ZIF‐8 particles . Alternatively, two silane coupling agents, (3‐aminopropyl)trimethoxysilane (APTMS) and (3‐aminopropyl)triethoxysilane (APTES), were used to alter the surface chemistry of ZIF‐8 particles to enhance the particle distribution and compatibility with the PES‐PEBA matrix . It was found that the APTES‐modified ZIF‐8 particles showed a better distribution in the composite membrane owing to the enhanced interaction between the ZIF‐8 surface and polymer chains.…”

Section: Introductionmentioning

confidence: 99%

Formation of a defect‐free polyimide/zeolitic imidazolate framework‐8 composite membrane for gas separation: in‐depth analysis of organic–inorganic compatibility

Tan

Ooi

Ahmad

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND The incompatibility between polymer matrix and filler usually leads to the formation of nonselective voids at the polymer/filler interface, which subsequently lowers the gas separation performance. In view of this, the effectiveness of (3‐aminopropyl)triethoxysilane (APTES) in promoting the interaction between alumina and polyimide (PI), as well as PI and zeolitic imidazolate framework‐8 (ZIF‐8) during the synthesis of PI/ZIF‐8 composite membrane was assessed experimentally. The experimental data also were verified through the calculation of binding energy via molecular simulation. RESULTS It was found that APTES improved the adhesion between alumina‐PI and allowed the formation of a defect‐free alumina‐supported PI membrane up to five layers of PI dip‐coating. Similarly, the compatibility between PI–ZIF‐8 also was shown to be improved by APTES. Indeed, the optimum CO2 permeance and CO2/N2 selectivity were found at 93.47 GPU and 7.50, respectively, at five layers of ZIF‐8 dip‐coating. In this work, the polymer‐filler compatibility also was verified through molecular simulation whereby a lower binding energy was obtained for system incorporated with APTES. CONCLUSION In short, the results indicated that APTES was effective in stabilizing the PI/ZIF‐8 composite membrane. The polymer‐filler compatibility also was successfully evaluated through the simple molecular simulation approach without requiring time‐consuming experiments. © 2018 Society of Chemical Industry

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Aminosilane-functionalized ZIF-8/PEBA mixed matrix membrane for gas separation application

Cited by 92 publications

References 35 publications

X-Shaped ZIF-8 for Immobilization Rhizomucor miehei Lipase via Encapsulation and Its Application toward Biodiesel Production

X-Shaped ZIF-8 for Immobilization Rhizomucor miehei Lipase via Encapsulation and Its Application toward Biodiesel Production

Comparison of ZnO nanofillers of different shapes on physical, thermal and gas transport properties of PEBA membrane: experimental testing and molecular simulation

Formation of a defect‐free polyimide/zeolitic imidazolate framework‐8 composite membrane for gas separation: in‐depth analysis of organic–inorganic compatibility

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