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Physical aging represents one of the major obstacles towards adoption of polymer of intrinsic microporosity (PIM) membranes for gas separation applications. In this work, mixed matrix membranes (MMMs) of 2D boron nitride nanosheets (BNNS) and PIM-1 were prepared and applied in the separation of a CO2/CH4 (1:1, v:v) binary gas mixture. The membranes were tested over a period of more than one year to evaluate their anti-aging properties as compared to neat PIM-1. The results show that introducing BNNS into PIM-1 leads to a significant reduction in the physical aging of PIM-1, as demonstrated by the values of reduction in CO2 permeability after 414 days (22% for the MMMs as compared to 58% for neat PIM-1). This work paves the way to using PIM-based membranes in industry.
Ahmed W. Ameen; Jing Ji; Marzieh Tamaddondar; Sajjad Moshenpour; Andrew B. Foster; Xiaolei Fan; Peter M. Budd; Davide Mattia; Patricia Gorgojo. 2D boron nitride nanosheets in PIM-1 membranes for CO2/CH4 separation. Journal of Membrane Science 2021, 636, 119527 .
AMA StyleAhmed W. Ameen, Jing Ji, Marzieh Tamaddondar, Sajjad Moshenpour, Andrew B. Foster, Xiaolei Fan, Peter M. Budd, Davide Mattia, Patricia Gorgojo. 2D boron nitride nanosheets in PIM-1 membranes for CO2/CH4 separation. Journal of Membrane Science. 2021; 636 ():119527.
Chicago/Turabian StyleAhmed W. Ameen; Jing Ji; Marzieh Tamaddondar; Sajjad Moshenpour; Andrew B. Foster; Xiaolei Fan; Peter M. Budd; Davide Mattia; Patricia Gorgojo. 2021. "2D boron nitride nanosheets in PIM-1 membranes for CO2/CH4 separation." Journal of Membrane Science 636, no. : 119527.
This work demonstrates very high removal rates (below the detection limit of 0.045 ppb) of inorganic arsenic from water using electrospun polyvinylidene difluoride (PVDF) membranes enhanced by the addition of functionalized graphene oxide in membrane distillation. This shows potential for applications in the many parts of the world suffering from arsenic-contaminated groundwater. These membranes were enhanced by the addition of reduced graphene oxide functionalized with superhydrophobic polyhedral oligomeric silsesquioxane molecules (POSS-rGO) into the spinning solutions. The flux of the best-performing rGO-enhanced membrane (containing 2 wt % POSS-rGO) was 21.5% higher than that of the pure PVDF membrane and almost double that of a commercial polytetrafluoroethylene (PTFE) membrane after 24 h of testing, with rejection values exceeding 99.9%. Furthermore, the flux of this membrane was stable over 5 days (∼28 L m–2 h–1) of continuous testing and was more stable than those of the PTFE and control membranes when treating a concentrated fouling solution of calcium carbonate and iron(III) sulfate heptahydrate. It also achieved higher permeate quality in these conditions. The Young’s modulus and ultimate tensile strength of the best-performing membrane increased by 38 and 271%, respectively, compared to the pure polymer membrane, while both had similar porosities of ∼91%.
Sebastian Leaper; Edgardo Oscar Avendaño Cáceres; Jose Miguel Luque-Alled; Sarah H. Cartmell; Patricia Gorgojo. POSS-Functionalized Graphene Oxide/PVDF Electrospun Membranes for Complete Arsenic Removal Using Membrane Distillation. ACS Applied Polymer Materials 2021, 3, 1854 -1865.
AMA StyleSebastian Leaper, Edgardo Oscar Avendaño Cáceres, Jose Miguel Luque-Alled, Sarah H. Cartmell, Patricia Gorgojo. POSS-Functionalized Graphene Oxide/PVDF Electrospun Membranes for Complete Arsenic Removal Using Membrane Distillation. ACS Applied Polymer Materials. 2021; 3 (4):1854-1865.
Chicago/Turabian StyleSebastian Leaper; Edgardo Oscar Avendaño Cáceres; Jose Miguel Luque-Alled; Sarah H. Cartmell; Patricia Gorgojo. 2021. "POSS-Functionalized Graphene Oxide/PVDF Electrospun Membranes for Complete Arsenic Removal Using Membrane Distillation." ACS Applied Polymer Materials 3, no. 4: 1854-1865.
Physical aging is currently a major obstacle for the commercialization of PIM-1 membranes for gas separation applications. A well-known approach to reversing physical aging effects of PIM-1 membranes at laboratory scale is soaking them in lower alcohols, such as methanol and ethanol. However, this procedure does not seem applicable at industrial level, and other strategies must be investigated. In this work, a regeneration method with alcohol vapors (ethanol or methanol) was developed to recover permeability of aged PIM-1 membranes, in comparison with the conventional soaking-in-liquid approach. The gas permeability and separation performance, before and post the regeneration methods, were assessed using a binary mixture of CO2 and CH4 (1:1, v:v). Our results show that an 8-hour methanol vapor treatment was sufficient to recover the original gas permeability, reaching a CO2 permeability > 7000 barrer.
Faiz Almansour; Monica Alberto; Rupesh S. Bhavsar; Xiaolei Fan; Peter M. Budd; Patricia Gorgojo. Recovery of free volume in PIM-1 membranes through alcohol vapor treatment. Frontiers of Chemical Science and Engineering 2021, 15, 872 -881.
AMA StyleFaiz Almansour, Monica Alberto, Rupesh S. Bhavsar, Xiaolei Fan, Peter M. Budd, Patricia Gorgojo. Recovery of free volume in PIM-1 membranes through alcohol vapor treatment. Frontiers of Chemical Science and Engineering. 2021; 15 (4):872-881.
Chicago/Turabian StyleFaiz Almansour; Monica Alberto; Rupesh S. Bhavsar; Xiaolei Fan; Peter M. Budd; Patricia Gorgojo. 2021. "Recovery of free volume in PIM-1 membranes through alcohol vapor treatment." Frontiers of Chemical Science and Engineering 15, no. 4: 872-881.
Membrane distillation (MD) is a thermal-based separation technique with the potential to treat a wide range of water types for various applications and industries. Certain challenges remain however, which prevent it from becoming commercially widespread including moderate permeate flux, decline in separation performance over time due to pore wetting and high thermal energy requirements. Nevertheless, its attractive characteristics such as high rejection (ca. 100%) of nonvolatile species, its ability to treat highly saline solutions under low operating pressures (typically atmospheric) as well as its ability to operate at low temperatures, enabling waste-heat integration, continue to drive research interests globally. Of particular interest is the class of carbon-based nanomaterials which includes graphene and carbon nanotubes, whose wide range of properties have been exploited in an attempt to overcome the technical challenges that MD faces. These low dimensional materials exhibit properties such as high specific surface area, high strength, tuneable hydrophobicity, enhanced vapour transport, high thermal and electrical conductivity and others. Their use in MD has resulted in improved membrane performance characteristics like increased permeability and reduced fouling propensity. They have also enabled novel membrane capabilities such as in-situ fouling detection and localised heat generation. In this review we provide a brief introduction to MD and describe key membrane characteristics and fabrication methods. We then give an account of the various uses of carbon nanomaterials for MD applications, focussing on polymeric membrane systems. Future research directions based on the findings are also suggested.
Sebastian Leaper; Ahmed Abdel-Karim; Patricia Gorgojo. The use of carbon nanomaterials in membrane distillation membranes: a review. Frontiers of Chemical Science and Engineering 2021, 15, 755 -774.
AMA StyleSebastian Leaper, Ahmed Abdel-Karim, Patricia Gorgojo. The use of carbon nanomaterials in membrane distillation membranes: a review. Frontiers of Chemical Science and Engineering. 2021; 15 (4):755-774.
Chicago/Turabian StyleSebastian Leaper; Ahmed Abdel-Karim; Patricia Gorgojo. 2021. "The use of carbon nanomaterials in membrane distillation membranes: a review." Frontiers of Chemical Science and Engineering 15, no. 4: 755-774.
A strategy to reduce the physical aging in PIM-1 membranes by incorporating novel functionalized graphene oxide (GO) fillers is reported. PIM-1 was covalently attached both to as-synthesized GO and to GO reacted with (3-aminopropyl)triethoxysilane (APTS-GO), leading to homogeneous dispersion of the nanofillers in the mixed matrix membranes (MMMs). It was found that the aging rate decreases with increasing content of (PIM-1)-functionalized GO, as evidenced by the smaller decrease in gas permeability over time. The best performance was achieved by a membrane containing 10 wt% of (PIM-1)-functionalized APTS-GO. This membrane maintains 85% of the initial CO2 permeability after 150 days (drop of only 310 Barrer), which represents about nine-fold less CO2 permeability drop as compared to pure PIM-1.
Jose Miguel Luque-Alled; Ahmed W. Ameen; Monica Alberto; Marzieh Tamaddondar; Andrew B. Foster; Peter M. Budd; Aravind Vijayaraghavan; Patricia Gorgojo. Gas separation performance of MMMs containing (PIM-1)-functionalized GO derivatives. Journal of Membrane Science 2020, 623, 118902 .
AMA StyleJose Miguel Luque-Alled, Ahmed W. Ameen, Monica Alberto, Marzieh Tamaddondar, Andrew B. Foster, Peter M. Budd, Aravind Vijayaraghavan, Patricia Gorgojo. Gas separation performance of MMMs containing (PIM-1)-functionalized GO derivatives. Journal of Membrane Science. 2020; 623 ():118902.
Chicago/Turabian StyleJose Miguel Luque-Alled; Ahmed W. Ameen; Monica Alberto; Marzieh Tamaddondar; Andrew B. Foster; Peter M. Budd; Aravind Vijayaraghavan; Patricia Gorgojo. 2020. "Gas separation performance of MMMs containing (PIM-1)-functionalized GO derivatives." Journal of Membrane Science 623, no. : 118902.
Superglassy polymers have emerged as potential membrane materials for several gas separation applications, including acid gas removal from natural gas. Despite the superior performance shown at laboratory scale, their use at industrial scale is hampered by their large drop in gas permeability over time due to physical aging. Several strategies are proposed in the literature to prevent loss of performance, the incorporation of fillers being a successful approach. In this work, we provide a comprehensive economic study on the application of superglassy membranes in a hybrid membrane/amine process for natural gas sweetening. The hybrid process is compared with the more traditional stand-alone amine-absorption technique for a range of membrane gas separation properties (CO2 permeance and CO2/CH4 selectivity), and recommendations for long-term membrane performance are made. These recommendations can drive future research on producing mixed matrix membranes (MMMs) of superglassy polymers with anti-aging properties (i.e., target permeance and selectivity is maintained over time), as thin film nanocomposite membranes (TFNs). For the selected natural gas composition of 28% of acid gas content (8% CO2 and 20% H2S), we have found that a CO2 permeance of 200 GPU and a CO2/CH4 selectivity of 16 is an optimal target.
Ahmed W. Ameen; Peter M. Budd; Patricia Gorgojo. Superglassy Polymers to Treat Natural Gas by Hybrid Membrane/Amine Processes: Can Fillers Help? Membranes 2020, 10, 413 .
AMA StyleAhmed W. Ameen, Peter M. Budd, Patricia Gorgojo. Superglassy Polymers to Treat Natural Gas by Hybrid Membrane/Amine Processes: Can Fillers Help? Membranes. 2020; 10 (12):413.
Chicago/Turabian StyleAhmed W. Ameen; Peter M. Budd; Patricia Gorgojo. 2020. "Superglassy Polymers to Treat Natural Gas by Hybrid Membrane/Amine Processes: Can Fillers Help?" Membranes 10, no. 12: 413.
Growing uncertainty in the future availability of freshwater sources has led to an increase in installations for desalination of seawater. Reverse osmosis (RO), currently the most widely adopted technique, has caused environmental concerns over the high associated greenhouse gas emissions and generation of large amounts of chemicals-containing brine. Significant consumption of electricity for RO desalination is an additional challenge, particularly in remote locations. In this review, forward osmosis (FO), membrane distillation (MD) and capacitive deionisation (CDI) are assessed as potential substitute technologies and the major recent advancements in each field are discussed. These emerging technologies offer significant advantages over RO, such as higher salt rejection (CDI, MD), higher recovery of water (MD), fewer pre-treatment stages (MD, FO) and the ability to use low-grade energy (MD, FO). In their current state, stand-alone technologies cannot compete with RO until certain challenges are addressed, including pore-wetting (MD) and high energy consumption (MD, CDI, FO). Hybrid systems that combine RO and emerging technologies may be useful for feed waters that cannot be treated by RO alone and their benefits may be able to offset the increase in capital costs. These and other aspects, such as operational stability should be considered in larger-scale, long-term studies.
Clara Skuse; Alejandro Gallego-Schmid; Adisa Azapagic; Patricia Gorgojo. Can emerging membrane-based desalination technologies replace reverse osmosis? Desalination 2020, 500, 114844 .
AMA StyleClara Skuse, Alejandro Gallego-Schmid, Adisa Azapagic, Patricia Gorgojo. Can emerging membrane-based desalination technologies replace reverse osmosis? Desalination. 2020; 500 ():114844.
Chicago/Turabian StyleClara Skuse; Alejandro Gallego-Schmid; Adisa Azapagic; Patricia Gorgojo. 2020. "Can emerging membrane-based desalination technologies replace reverse osmosis?" Desalination 500, no. : 114844.
In this study, a low pressure-driven ultrafiltration (UF) membrane has been developed using cellulose acetate (CA), α-aminophosphonate modified montmorillonite (MMT) and Ag-TiO2 nanoparticles. The characteristics of the developed materials and the performance of the fabricated membranes were exhaustively evaluated. FTIR and TGA results proved the successful incorporation of α-aminophosphonate in the montmorillonite (MT), while the XRD results showed that it was intercalated into the MT layers. XRD results also showed that only silver doped anatase TiO2 (Ag-TiO2 NPs) was obtained in nanosized form as inferred from the TEM and XRD micrographs. Compared to neat CA membrane, the composite membranes (CMs) exhibited a tremendous high flux (up to 400 LMH bar), almost 6-fold increment, and a substantially reduced fouling rate. The CMs were durable, behaved as an ultrafiltration membrane, and their performance in terms of water and protein (BSA) solution permeance, and rejection were comparable to commercial UF membranes reported in the literature. The optimum CM (CM-6) exhibited a satisfactory efficiency in treating textile wastewater and showed an adequate rejection for hazardous contaminants (chromium, nickel, lead and fluoride). To sum up, fillers enhanced the hydrophilicity, mechanical stability and performance of the fabricated membranes. The fabricated membranes in this work showed potentiality for hazardous textile wastewater treatment.
Ahmed Abdel-Karim; Mehrez E. El-Naggar; Emad Radwan; Ibrahim M. Mohamed; Mohamed Azaam; El-Refaie Kenawy. High-performance mixed-matrix membranes enabled by organically/inorganic modified montmorillonite for the treatment of hazardous textile wastewater. Chemical Engineering Journal 2020, 405, 126964 .
AMA StyleAhmed Abdel-Karim, Mehrez E. El-Naggar, Emad Radwan, Ibrahim M. Mohamed, Mohamed Azaam, El-Refaie Kenawy. High-performance mixed-matrix membranes enabled by organically/inorganic modified montmorillonite for the treatment of hazardous textile wastewater. Chemical Engineering Journal. 2020; 405 ():126964.
Chicago/Turabian StyleAhmed Abdel-Karim; Mehrez E. El-Naggar; Emad Radwan; Ibrahim M. Mohamed; Mohamed Azaam; El-Refaie Kenawy. 2020. "High-performance mixed-matrix membranes enabled by organically/inorganic modified montmorillonite for the treatment of hazardous textile wastewater." Chemical Engineering Journal 405, no. : 126964.
A low crosslink density (LCD) network-PIM-1, which offers high compatability with the polymer of intrinsic microporosity PIM-1, is synthesised by a modified PIM-1 polycondensation that combines both a tetrafluoro- and an octafluoro- monomer. To maximise the advantages of utilising such crosslinked PIM-1 fillers in PIM-1-based mixed matrix membranes (MMMs), a grafting route is used to decorate the LCD-network-PIM-1 (dispersed phase) with PIM-1 chains, to further enhance compatability with the PIM-1 matrix. Mixed-gas CO2/CH4 (1:1, v:v) separation results over 160 days of membrane aging confirm the success of a relatively short (24 h) grafting reaction in improving the initial CO2 separation performance, as well as hindering the aging of PIM-1/grafted-LCD-network-PIM-1 MMMs. For MMMs based on a 24 h grafting route, all the gas separation data surpass the 2008 Robeson upper bound by a significant margin, and the 160-day aged membranes show only 29% reduction from the initial CO2 permeability, which is substantially less than the equivalent losses of nearly 70% and 48% for PIM-1 and traditionally-fabricated MMM counterparts, respectively. These results demonstrate the potential of network-PIM components for obtaining much more stable gas separation performance over extended periods of time.
Marzieh Tamaddondar; Andrew Bryan Foster; Mariolino Carta; Patricia Gorgojo; Neil B. McKeown; Peter Martin Budd. Mitigation of Physical Aging with Mixed Matrix Membranes Based on Cross-Linked PIM-1 Fillers and PIM-1. ACS Applied Materials & Interfaces 2020, 12, 46756 -46766.
AMA StyleMarzieh Tamaddondar, Andrew Bryan Foster, Mariolino Carta, Patricia Gorgojo, Neil B. McKeown, Peter Martin Budd. Mitigation of Physical Aging with Mixed Matrix Membranes Based on Cross-Linked PIM-1 Fillers and PIM-1. ACS Applied Materials & Interfaces. 2020; 12 (41):46756-46766.
Chicago/Turabian StyleMarzieh Tamaddondar; Andrew Bryan Foster; Mariolino Carta; Patricia Gorgojo; Neil B. McKeown; Peter Martin Budd. 2020. "Mitigation of Physical Aging with Mixed Matrix Membranes Based on Cross-Linked PIM-1 Fillers and PIM-1." ACS Applied Materials & Interfaces 12, no. 41: 46756-46766.
Bio-based organic acids constitute an important group of building block chemicals that can be produced from renewable resources, becoming a sustainable alternative to conventional petrochemical-derived commodities. However, due to the growing number of green solvents emerging as extraction media, the proper solvent selection for biomolecule separation from fermentation broths has become a key challenge in the bio-refinery industry. The overall aim of this work is to develop a roadmap to select and design green solvents for sustainable downstream processing of bio-based organic acids. To this end, a wide range of neoteric solvents (ionic liquids, eutectic solvents and bio-based solvents) were systematically evaluated for the recovery of relevant bio-organic acids through combination of experimental and COSMO-RS molecular simulation methods. Comprehensive thermodynamic analyses evaluating the organic acid partition coefficients, excess enthalpy contributions, solvent-water affinity, and process spontaneity were performed to elucidate the main mechanism driving the separation process and to provide essential guidelines for further solvent development. Based on these findings, a rational screening approach was established to identify suitable solvents for the recovery of structurally different bio-organic acids. Ultimately, this paper provides a green solvent selection guide to design sustainable separation processes of bio-based organic acids, as valuable platform chemicals transitioning towards a bio-based economy.
Pablo López-Porfiri; Patricia Gorgojo; Maria Gonzalez-Miquel. Green Solvent Selection Guide for Biobased Organic Acid Recovery. ACS Sustainable Chemistry & Engineering 2020, 8, 8958 -8969.
AMA StylePablo López-Porfiri, Patricia Gorgojo, Maria Gonzalez-Miquel. Green Solvent Selection Guide for Biobased Organic Acid Recovery. ACS Sustainable Chemistry & Engineering. 2020; 8 (24):8958-8969.
Chicago/Turabian StylePablo López-Porfiri; Patricia Gorgojo; Maria Gonzalez-Miquel. 2020. "Green Solvent Selection Guide for Biobased Organic Acid Recovery." ACS Sustainable Chemistry & Engineering 8, no. 24: 8958-8969.
This work deals with the use of octadecylamine (ODA)-functionalized reduced graphene oxide (rGO) for thin film nanocomposite (TFN) membranes. The functionalization of rGO with ODA leads to graphene-based nanofillers, more hydrophobic than GO, and thus to the easier dispersion in the organic phase of the interfacial polymerization (IP) reaction carried out to produce polyamide (PA) TFN membranes. The performance of the new TFN membranes is evaluated by organic solvent nanofiltration (OSN) of alcoholic solutions containing dyes Acridine Orange (AO, MW 265 g·mol−1), Sunset Yellow (SY, MW 452 g·mol−1) and Rose Bengal (RB, MW 974 g·mol−1). The functionalized nature of the nanoparticles introduced into the hydrophilic PA layer allows an increase of the ethanol permeance from 2.8, 3.4 and 3.7 L·m−2·h−1·bar−1 for AO, SY and RB, respectively, corresponding to the bare thin film composite membrane (without rGO-ODA particles), to 4.3, 4.6 and 6.0 L·m−2·h−1·bar−1 for AO, SY and RB, respectively, for the rGO-ODA based TFN membrane. In fact, we hypothesize that the increase of the ethanol flux achieved with the use of rGO-ODA as a filler in TFN membranes is owing to a combination of the simultaneous presence of polar and non-polar groups from rGO-ODA nanosheets and the creation of still selective narrow gaps between these particles and the polyamide (PA).
Lorena Paseta; José Miguel Luque-Alled; Magdalena Malankowska; Marta Navarro; Patricia Gorgojo; Joaquín Coronas; Carlos Téllez. Functionalized graphene-based polyamide thin film nanocomposite membranes for organic solvent nanofiltration. Separation and Purification Technology 2020, 247, 116995 .
AMA StyleLorena Paseta, José Miguel Luque-Alled, Magdalena Malankowska, Marta Navarro, Patricia Gorgojo, Joaquín Coronas, Carlos Téllez. Functionalized graphene-based polyamide thin film nanocomposite membranes for organic solvent nanofiltration. Separation and Purification Technology. 2020; 247 ():116995.
Chicago/Turabian StyleLorena Paseta; José Miguel Luque-Alled; Magdalena Malankowska; Marta Navarro; Patricia Gorgojo; Joaquín Coronas; Carlos Téllez. 2020. "Functionalized graphene-based polyamide thin film nanocomposite membranes for organic solvent nanofiltration." Separation and Purification Technology 247, no. : 116995.
Adsorptive separation is a promising alternative to the energy-intensive cryogenic distillation process for separating the ethane/ethylene (C2H6/C2H4) mixtures. Herein, two pillared-layer metal-organic frameworks (MOFs), Ni(HBTC)(bipy) and Ni2(HBTC)2(bipy)0.6(dabco)1.4, are prepared as the C2H6-selective adsorbents for C2H4 purification from C2H6/C2H4 mixtures. The effect of the type of pillars on the framework structure, thermal and moisture stability, as well as the C2H6 and C2H4 adsorption propertiy, of the MOFs was studied. The use of the longer pillars (i.e. bipy versus dabco) to scafolld the Ni(HBTC) improved the pore size (5.5 Å versus 5.3 Å), specific surface area (1474 m2/g versus 1070 m2/g) and moisture stability in the relative humidity range of 0–90%, but compromised the thermal stability (267 °C versus 278 °C). Both MOFs were C2H6-selective, which was evidencd by the single component adsorption experiments using C2H6 and C2H4. The ideal adsorbed solution theory (IAST) selectivity for C2H6/C2H4 mixtures (1:1 and 1:15, v/v) is in the range of 1.4–1.7 at 25–50 °C and 0–1 bar. The preferential adsorption towards C2H6 over C2H4 on both MOFs is then explained by the isosteric heat of adsorption. Additionally, Ni(HBTC)(bipy) also shows the best capacity of up to 6.6 mmol/g for C2H6 adsorption in comparison with other C2H6-selective MOFs at 25 °C and 1 bar. Both MOFs showed the excellent recyclability, with the negligible reduction in the gas uptake observed during four cycles of adsorption/desorption tests. Besides, breakthrough experiments demonstrated that both MOFs can achieve efficient separation of an equimolar C2H6/C2H4 mixture. The findings suggest that Ni(HBTC)(bipy) and Ni2(HBTC)2(bipy)0.6(dabco)1.4 can be further considered as C2H6-trapping adsorbents for the C2H6/C2H4 separation applications in practice.
Huan Xiang; Yan Shao; Ahmed Ameen; Huanhao Chen; Weiting Yang; Patricia Gorgojo; Flor R. Siperstein; Xiaolei Fan; Qinhe Pan. Adsorptive separation of C2H6/C2H4 on metal-organic frameworks (MOFs) with pillared-layer structures. Separation and Purification Technology 2020, 242, 116819 .
AMA StyleHuan Xiang, Yan Shao, Ahmed Ameen, Huanhao Chen, Weiting Yang, Patricia Gorgojo, Flor R. Siperstein, Xiaolei Fan, Qinhe Pan. Adsorptive separation of C2H6/C2H4 on metal-organic frameworks (MOFs) with pillared-layer structures. Separation and Purification Technology. 2020; 242 ():116819.
Chicago/Turabian StyleHuan Xiang; Yan Shao; Ahmed Ameen; Huanhao Chen; Weiting Yang; Patricia Gorgojo; Flor R. Siperstein; Xiaolei Fan; Qinhe Pan. 2020. "Adsorptive separation of C2H6/C2H4 on metal-organic frameworks (MOFs) with pillared-layer structures." Separation and Purification Technology 242, no. : 116819.
The synthesis of PIM-1 is reported from step-growth polymerizations of 5,5′,6,6′-tetrahydroxy-3,3,3′,3′-tetramethyl-1,1′-spirobisindane with the commercially cheaper monomer, tetrachloroterephthalonitrile. Nitrogen-purged polymerizations (100–160 °C) were quenched after a monitored increase in viscosity. A combination of multiple detector size exclusion chromatography, nuclear magnetic resonance, matrix-assisted laser desorption/ionization-time of flight (MALDI TOF) mass spectrometry, dynamic light scattering, and elemental analysis was used to elucidate significant structural differences (cyclic, branched, tadpole, extended, and network topologies) in the polymers produced under different conditions. A significant proportion of the apparent surface area (up to 200 m2 g–1) associated with PIM-1 can be attributable to whether its contorted polymer chains in fact link to form cyclic or other nonlinear structures. Membranes cast from solutions of polymer samples containing higher branching and network contents exhibited higher gas pair selectivities (CO2/CH4 and CO2/N2), above the Robeson 2008 upper bound. A toolbox approach to the characterization and production of topologically different PIM-1 samples has been developed which can be used to tune membrane performance for gas separation and other applications.
Andrew B. Foster; Marzieh Tamaddondar; Jose M. Luque-Alled; Wayne J. Harrison; Ze Li; Patricia Gorgojo; Peter M. Budd. Understanding the Topology of the Polymer of Intrinsic Microporosity PIM-1: Cyclics, Tadpoles, and Network Structures and Their Impact on Membrane Performance. Macromolecules 2020, 53, 569 -583.
AMA StyleAndrew B. Foster, Marzieh Tamaddondar, Jose M. Luque-Alled, Wayne J. Harrison, Ze Li, Patricia Gorgojo, Peter M. Budd. Understanding the Topology of the Polymer of Intrinsic Microporosity PIM-1: Cyclics, Tadpoles, and Network Structures and Their Impact on Membrane Performance. Macromolecules. 2020; 53 (2):569-583.
Chicago/Turabian StyleAndrew B. Foster; Marzieh Tamaddondar; Jose M. Luque-Alled; Wayne J. Harrison; Ze Li; Patricia Gorgojo; Peter M. Budd. 2020. "Understanding the Topology of the Polymer of Intrinsic Microporosity PIM-1: Cyclics, Tadpoles, and Network Structures and Their Impact on Membrane Performance." Macromolecules 53, no. 2: 569-583.
Jose Miguel Luque-Alled; Ahmed Abdel-Karim; Monica Alberto; Sebastian Leaper; Maria Perez-Page; Kun Huang; Aravind Vijayaraghavan; Amer S. El-Kalliny; Stuart M. Holmes; Patricia Gorgojo. Polyethersulfone membranes: From ultrafiltration to nanofiltration via the incorporation of APTS functionalized-graphene oxide. Separation and Purification Technology 2020, 230, 1 .
AMA StyleJose Miguel Luque-Alled, Ahmed Abdel-Karim, Monica Alberto, Sebastian Leaper, Maria Perez-Page, Kun Huang, Aravind Vijayaraghavan, Amer S. El-Kalliny, Stuart M. Holmes, Patricia Gorgojo. Polyethersulfone membranes: From ultrafiltration to nanofiltration via the incorporation of APTS functionalized-graphene oxide. Separation and Purification Technology. 2020; 230 ():1.
Chicago/Turabian StyleJose Miguel Luque-Alled; Ahmed Abdel-Karim; Monica Alberto; Sebastian Leaper; Maria Perez-Page; Kun Huang; Aravind Vijayaraghavan; Amer S. El-Kalliny; Stuart M. Holmes; Patricia Gorgojo. 2020. "Polyethersulfone membranes: From ultrafiltration to nanofiltration via the incorporation of APTS functionalized-graphene oxide." Separation and Purification Technology 230, no. : 1.
Microporous polymer nanosheets with thicknesses in the range 3-5 nm and with high apparent surface area (Brunauer-Emmett-Teller surface area 940 m2 g-1 ) are formed when the effectively bifunctional (tetrafluoro) monomer used in the preparation of the prototypical polymer of intrinsic microporosity PIM-1 is replaced with an effectively tetrafunctional (octafluoro) monomer to give a tightly crosslinked network structure. When employed as a filler in mixed-matrix membranes based on PIM-1, a low loading of 0.5 wt% network-PIM-1 nanosheets gives rise to enhanced CO2 permeability and CO2 /CH4 selectivity, compared to pure PIM-1.
Marzieh Tamaddondar; Andrew B. Foster; Jose M. Luque‐Alled; Kadhum J. Msayib; Mariolino Carta; Sara Sorribas; Patricia Gorgojo; Neil B. McKeown; Peter M. Budd. Intrinsically Microporous Polymer Nanosheets for High‐Performance Gas Separation Membranes. Macromolecular Rapid Communications 2019, 41, e1900572 .
AMA StyleMarzieh Tamaddondar, Andrew B. Foster, Jose M. Luque‐Alled, Kadhum J. Msayib, Mariolino Carta, Sara Sorribas, Patricia Gorgojo, Neil B. McKeown, Peter M. Budd. Intrinsically Microporous Polymer Nanosheets for High‐Performance Gas Separation Membranes. Macromolecular Rapid Communications. 2019; 41 (2):e1900572.
Chicago/Turabian StyleMarzieh Tamaddondar; Andrew B. Foster; Jose M. Luque‐Alled; Kadhum J. Msayib; Mariolino Carta; Sara Sorribas; Patricia Gorgojo; Neil B. McKeown; Peter M. Budd. 2019. "Intrinsically Microporous Polymer Nanosheets for High‐Performance Gas Separation Membranes." Macromolecular Rapid Communications 41, no. 2: e1900572.
Adsorptive separation of ethylene/ethane (C2H4/C2H6) binary mixture has growing interest in petrochemical industries compared to the conventional energy-intensive cryogenic distillation. Development of moisture-stable materials with high selectivity is of great importance to accomplish C2H4/C2H6 separation. Coordination pillared-layer metal-organic framework (CPL-MOF) CPL-2 was synthesised at room temperature, and then modified by silver ions impregnation to enhance the selectivity towards ethylene over ethane. The synthesised CPL-2 and Ag/CPL-2 MOFs have excellent moisture stability which was confirmed by the dynamic water vapour adsorption analysis under 90% relative humidity, showing no significant framework decomposition, even at 50 °C. The calculated selectivity based on gravimetric single-component gas adsorption experiments shows the significantly improved C2H4/C2H6 selectivity from 1.4 to 26.1 after loading 10 wt.% (theoretical) of silver ions on CPL-2. Breakthrough experiments for C2H4/C2H6 (1:1, v/v) mixture suggest that both CPL-2 and 10 wt.% Ag/CPL-2 can achieve the binary mixture separation, and 10 wt.% Ag/CPL-2 shows relatively better dynamic separation performance compared to parent CPL-2. The good adsorption selectivity and moisture stability allow CPL-MOF to be a class of promising porous materials for further exploitation in the separation of C2H4/C2H6 mixtures. Additionally, the method presented here can potentially be extended to other CPLs with different pore sizes for alkene/alkane separations.
Huan Xiang; Ahmed Ameen; Jin Shang; Yilai Jiao; Patricia Gorgojo; Flor R. Siperstein; Xiaolei Fan. Synthesis and modification of moisture-stable coordination pillared-layer metal-organic framework (CPL-MOF) CPL-2 for ethylene/ethane separation. Microporous and Mesoporous Materials 2019, 293, 109784 .
AMA StyleHuan Xiang, Ahmed Ameen, Jin Shang, Yilai Jiao, Patricia Gorgojo, Flor R. Siperstein, Xiaolei Fan. Synthesis and modification of moisture-stable coordination pillared-layer metal-organic framework (CPL-MOF) CPL-2 for ethylene/ethane separation. Microporous and Mesoporous Materials. 2019; 293 ():109784.
Chicago/Turabian StyleHuan Xiang; Ahmed Ameen; Jin Shang; Yilai Jiao; Patricia Gorgojo; Flor R. Siperstein; Xiaolei Fan. 2019. "Synthesis and modification of moisture-stable coordination pillared-layer metal-organic framework (CPL-MOF) CPL-2 for ethylene/ethane separation." Microporous and Mesoporous Materials 293, no. : 109784.
The application of three-dimensional (3D) pillared-layer metal-organic frameworks (MOFs) M(bdc)(ted)0.5 (M = Co, Cu, Ni, Zn) in the adsorptive separation of ethane/ethylene (C2H6/C2H4) mixtures was studied. The effect of the type of metals in M(bdc)(ted)0.5 on the framework structure regarding the moisture stability and adsorption performance was investigated. M(bdc)(ted)0.5 MOFs show excellent porous structures with high surface areas of up to 1905 m2/g (M = Ni), as well as being stable under humid conditions (assessed by the dynamic water vapour adsorption tests with maximum 20% relative humidity at 25 °C). M(bdc)(ted)0.5 exhibits the preferential adsorption of C2H6 over C2H4 under all conditions (i.e. 25–50 °C and 0–10 bar), although a reversal in adsorption uptake (i.e. C2H4 adsorption uptake exceeds the amount adsorbed of C2H6) occurs at pressures of >6 bar. The adsorption capacities of C2H6 and C2H4 on M(bdc)(ted)0.5 adsorbents are up to 8.63 and 8.79 mmol/g at 25 °C and 10 bar, respectively. The calculated C2H6/C2H4 selectivity for an equimolar mixture is insensitive to the metal ions in M(bdc)(ted)0.5, which varies between 1.4 and 1.9. Dynamic breakthrough experiments show that C2H6/C2H4 mixture can be separated in a fixed bed packed with Ni(bdc)(ted)0.5. The good adsorption capacity and selectivity, as well as the low isosteric heat of adsorption, make M(bdc)(ted)0.5 MOFs, especially Ni(bdc)(ted)0.5, good candidates to be further developed for the effective separation of C2H6/C2H4 mixtures in the presence of water vapour with a relative humidity lower than 30%.
Huan Xiang; Ahmed Ameen; Patricia Gorgojo; Flor R. Siperstein; Stuart M. Holmes; Xiaolei Fan. Selective adsorption of ethane over ethylene on M(bdc)(ted)0.5 (M = Co, Cu, Ni, Zn) metal-organic frameworks (MOFs). Microporous and Mesoporous Materials 2019, 292, 109724 .
AMA StyleHuan Xiang, Ahmed Ameen, Patricia Gorgojo, Flor R. Siperstein, Stuart M. Holmes, Xiaolei Fan. Selective adsorption of ethane over ethylene on M(bdc)(ted)0.5 (M = Co, Cu, Ni, Zn) metal-organic frameworks (MOFs). Microporous and Mesoporous Materials. 2019; 292 ():109724.
Chicago/Turabian StyleHuan Xiang; Ahmed Ameen; Patricia Gorgojo; Flor R. Siperstein; Stuart M. Holmes; Xiaolei Fan. 2019. "Selective adsorption of ethane over ethylene on M(bdc)(ted)0.5 (M = Co, Cu, Ni, Zn) metal-organic frameworks (MOFs)." Microporous and Mesoporous Materials 292, no. : 109724.
A new series of thin film composite membranes with high CO2 permeance (up to 8000 GPU) and CO2/N2 selectivity (up to 55.7) was designed and fabricated via coating PIM-1 solution in a mixture of chloroform and trichloroethylene on top of a cross-linked PTMSP gutter layer.
Ilya Borisov; Danila Bakhtin; Jose M. Luque-Alled; Anastasiya Rybakova; Veronika Makarova; Andrew B. Foster; Wayne J. Harrison; Vladimir Volkov; Viktoria Polevaya; Patricia Gorgojo; Eric Prestat; Peter M. Budd; Alexey Volkov. Synergistic enhancement of gas selectivity in thin film composite membranes of PIM-1. Journal of Materials Chemistry A 2019, 7, 6417 -6430.
AMA StyleIlya Borisov, Danila Bakhtin, Jose M. Luque-Alled, Anastasiya Rybakova, Veronika Makarova, Andrew B. Foster, Wayne J. Harrison, Vladimir Volkov, Viktoria Polevaya, Patricia Gorgojo, Eric Prestat, Peter M. Budd, Alexey Volkov. Synergistic enhancement of gas selectivity in thin film composite membranes of PIM-1. Journal of Materials Chemistry A. 2019; 7 (11):6417-6430.
Chicago/Turabian StyleIlya Borisov; Danila Bakhtin; Jose M. Luque-Alled; Anastasiya Rybakova; Veronika Makarova; Andrew B. Foster; Wayne J. Harrison; Vladimir Volkov; Viktoria Polevaya; Patricia Gorgojo; Eric Prestat; Peter M. Budd; Alexey Volkov. 2019. "Synergistic enhancement of gas selectivity in thin film composite membranes of PIM-1." Journal of Materials Chemistry A 7, no. 11: 6417-6430.
We investigated the drying dynamics and resulting salt deposition patterns from evaporating saline droplets on fabricated graphene oxide (GO) and reduced graphene oxide (rGO) membranes. As evaporation proceeds, salt concentration increases until it exceeds substantially the solubility limit which results in the formation of salt crystals. Scanning electron microscopy (SEM) imaging enabled us to investigate how the properties of the fabricated membranes influence the salt deposition patterns and crystal morphology providing us with an opportunity to control salt deposition patterns on the surface. The observation from the drying of saline droplets on fabricated GO and rGO membranes lead us to conclude that combined effects of the membrane roughness, interlayer spacing and nanochannel connectivity determines the drying dynamics and the final salt deposition patterns. Our results extend the understanding of the interaction between surface properties and salt deposition patterns which is relevant information to various engineering processes such as coating of marine vessels and in water remediation technologies.
Abdulkadir Osman; Sebastian Leaper; Vishnu Sreepal; Patricia Gorgojo; Hugh Stitt; Nima Shokri. Dynamics of Salt Precipitation on Graphene Oxide Membranes. Crystal Growth & Design 2018, 19, 498 -505.
AMA StyleAbdulkadir Osman, Sebastian Leaper, Vishnu Sreepal, Patricia Gorgojo, Hugh Stitt, Nima Shokri. Dynamics of Salt Precipitation on Graphene Oxide Membranes. Crystal Growth & Design. 2018; 19 (1):498-505.
Chicago/Turabian StyleAbdulkadir Osman; Sebastian Leaper; Vishnu Sreepal; Patricia Gorgojo; Hugh Stitt; Nima Shokri. 2018. "Dynamics of Salt Precipitation on Graphene Oxide Membranes." Crystal Growth & Design 19, no. 1: 498-505.
Hydrophobic polyvinylidene fluoride (PVDF) membranes have been successfully used in membrane distillation (MD) for desalination applications; however, there is still room for performance enhancements both regarding water flux and salt rejection. In this work, reduced graphene oxide (rGO) nanoplatelets with different degrees of reduction (36%, 58%, 65 and 69% removal of oxygen, as characterized by XPS) were incorporated as fillers in PVDF matrices in order to evaluate the effect of the oxygen content of the fillers in the MD performance. UV–Vis and Raman spectroscopies were also used to characterize the fabricated rGO. Changes in morphology of the prepared mixed matrix membranes (MMMs) were assessed via scanning electron microscopy (SEM) and were related to the increased hydrophilicity and viscosity of the casting solutions when fillers were added. MMMs containing 0.5 wt% rGO with an optimum degree of reduction of 58% exhibited an improved MD performance, with fluxes of ~7.0 L m−2 h−1 (LMH), representing an enhancement of ~169% in comparison with the plain PVDF membrane, without compromising salt rejection (>99.99%). Continuous testing for up to 96 h showed a stable performance of the developed MMMs, without compromising the quality of the permeate.
Ahmed Abdel-Karim; Jose Miguel Luque-Alled; Sebastian Leaper; Monica Alberto; Xiaolei Fan; Aravind Vijayaraghavan; Tarek A. Gad-Allah; Amer S. El-Kalliny; Gyorgy Szekely; Sayed I.A. Ahmed; Stuart M. Holmes; Patricia Gorgojo. PVDF membranes containing reduced graphene oxide: Effect of degree of reduction on membrane distillation performance. Desalination 2018, 452, 196 -207.
AMA StyleAhmed Abdel-Karim, Jose Miguel Luque-Alled, Sebastian Leaper, Monica Alberto, Xiaolei Fan, Aravind Vijayaraghavan, Tarek A. Gad-Allah, Amer S. El-Kalliny, Gyorgy Szekely, Sayed I.A. Ahmed, Stuart M. Holmes, Patricia Gorgojo. PVDF membranes containing reduced graphene oxide: Effect of degree of reduction on membrane distillation performance. Desalination. 2018; 452 ():196-207.
Chicago/Turabian StyleAhmed Abdel-Karim; Jose Miguel Luque-Alled; Sebastian Leaper; Monica Alberto; Xiaolei Fan; Aravind Vijayaraghavan; Tarek A. Gad-Allah; Amer S. El-Kalliny; Gyorgy Szekely; Sayed I.A. Ahmed; Stuart M. Holmes; Patricia Gorgojo. 2018. "PVDF membranes containing reduced graphene oxide: Effect of degree of reduction on membrane distillation performance." Desalination 452, no. : 196-207.