Article
Engineering, Chemical
Zhenggang Wang, Jianwei Yuan, Renhao Li, Haipeng Zhu, Jingui Duan, Yanan Guo, Gongping Liu, Wanqin Jin
Summary: This study utilized ZIF-301 MOF as filler to fabricate mixed-matrix membranes for CO2/CH4 separation, resulting in membranes with excellent transport properties obtained through a solvent exchange approach. The incorporation of ZIF-301 enhanced both CO2 permeability and CO2/CH4 selectivity, surpassing the 2008 Robeson upper-bound and showing potential for application in natural gas purification.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Tongxin Liu, Ruili Zhang, Guangcan Huang, Yabo Xie, Lin-Hua Xie, Jian-Rong Li
Summary: As a new type of porous materials, metal-organic cages (MOCs) have great potential in adsorption and separation. In this study, a series of zirconocene-based MOCs were used to fabricate MMMs with polyimide 6FDA-DAM, and the MOC-1-4F based membranes showed improved gas separation performance compared to other MOC-based membranes. The introduction of MOC-1-4F promoted the Tg values, mechanical property, CO2 solubility, and diffusivity of the membrane. The low-loaded MOC-1-4F MMM exhibited significantly improved CO2 permeability and selectivity for CO2/CH4 separation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Mohd Zamidi Ahmad, Violeta Martin-Gil, Tatana Supinkova, Pierrick Lambert, Roberto Castro-Munoz, Pavel Hrabanek, Milan Kocirik, Vlastimil Fila
Summary: The study investigates a new mixed matrix membrane with SSZ-16 zeolite addition to improve gas separation performance. While higher filler loadings slightly lower permeability, excessively high loadings can lead to a drop in selectivity due to defective polymer-filler interfaces.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Polymer Science
Kavya Adot Veetil, Asmaul Husna, Md. Homayun Kabir, Insu Jeong, Ook Choi, Iqubal Hossain, Tae-Hyun Kim
Summary: The use of mixed matrix membranes (MMMs) comprising metal-organic frameworks (MOFs) has been recognized as an effective strategy for enhancing gas separation efficiency. However, the poor compatibility between the filler and matrix may compromise the separation performance. This study modifies the filler to improve its compatibility with the matrix and enhance the selectivity of CO2 over N-2 and CH4.
Article
Engineering, Chemical
Ruoxing Liao, Yumin Guo, Liqiu Yang, Haoli Zhou, Wanqin Jin
Summary: The solvent-induced microstructure of a polyimide membrane was used to enhance its CO2/CH4 separation performance.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Chemistry, Physical
Liting Yu, Liqin Hao, Yang Feng, Jia Pang, Mengwei Guo, Liangjun Li, Weidong Fan, Lili Fan, Rongming Wang, Zixi Kang, Daofeng Sun
Summary: In this study, an IL@CC3/PIM-1 membrane was constructed by introducing an ionic liquid (IL) into the molecular fillers of CC3. The doping of IL resulted in improved pore structure of POCs, enhanced gas permeability and selectivity. The membrane also exhibited good stability and maintained stable separation performance under different conditions.
Article
Polymer Science
Zeljka P. Madzarevic, Beatriz Seoane, Jorge Gascon, Maruti Hegde, Theo J. Dingemans
Summary: A series of membranes based on non-linear all-aromatic polyimides were investigated to understand how their backbone geometry and local electrostatics influence gas transport and CO2/CH4 separation ability. The results showed that the non-linear backbone geometry promotes CO2 permeability, while the presence of an electrostatic dipole moment associated with the 1,3,4-oxadiazole heterocycle governs CO2/CH4 separation selectivity.
Article
Biochemistry & Molecular Biology
Stefanie Bugel, Quang-Dien Hoang, Alex Spiess, Yangyang Sun, Shanghua Xing, Christoph Janiak
Summary: This study demonstrates the enhancement of CO2/CH4 separation efficiency by incorporating covalent triazine framework CTF-biphenyl as filler material in a polyimide matrix, achieving more than doubled CO2 permeability with only 16% loading of CTF-biphenyl. The proposed mixed-matrix membranes show improved CO2 separation performance while maintaining high CO2/CH4 selectivity compared to pure polymer membranes.
Article
Green & Sustainable Science & Technology
George Theodorakopoulos, Dionysios S. Karousos, Konstantinos G. Mansouris, Andreas A. Sapalidis, Evangelos P. Kouvelos, Evangelos P. Favvas
Summary: Mixed matrix membranes play a crucial role in the preparation of stable, stretchy, durable and efficient membranes for gas separation applications. This article presents the development steps, structural characteristics, and gas selectivity properties of graphene nanoplatelets-based mixed matrix hollow fiber membranes.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2022)
Article
Chemistry, Multidisciplinary
Anand Jain, Mohd Zamidi Ahmad, Audrey Linkes, Violeta Martin-Gil, Roberto Castro-Munoz, Pavel Izak, Zdenek Sofer, Werner Hintz, Vlastimil Fila
Summary: This study presents the gas separation evaluation of 6FDA-DAM:DABA (3:1) co-polyimide and its enhanced mixed matrix membranes with graphene oxide (GO) and ZIF-8 nanoparticles. The addition of GO (1 wt.%)/ZIF-8 (10 wt.%) significantly improved the CO2 permeability, but the selectivity decreased due to non-selective filler-polymer interfacial voids. The hybrid membranes showed good performance stability close to the upper bound in 2019 under different feed pressure conditions.
Article
Engineering, Chemical
Farshad Shabani, Mohammad Ali Aroon, Takeshi Matsuura, Roya Farhadi
Summary: Fullerene nanoparticles and carbon nanotubes were used to form mixed matrix membranes with Polyethersulfone matrix, functionalized with low molecular weight paranitroaniline. The PES/pNA-MWCNTS 0.5 wt% sample showed the highest selectivity and desired CO2 permeance among other samples, based on gas permeation and separation tests.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Ke Chen, Linhan Ni, Hao Zhang, Jia Xie, Xin Yan, Saisai Chen, Junwen Qi, Chaohai Wang, Xiuyun Sun, Jiansheng Li
Summary: The interfacial compatibility between fillers and polymers significantly influences the separation performance of mixed matrix membranes (MMMs). In this study, a functional layer veiled zeolite imidazolate frameworks-67 (VZIF-67) was utilized as an efficient nanofiller to fabricate MMMs with enhanced separation performance. By optimizing the loading amount of VZIF-67, the resultant MMMs exhibited improved CO2/CH4 selectivity and CO2 permeability, surpassing the control membrane. Reinforcing the interfacial compatibility between the nanofillers and polymer matrix further enhanced the membrane performance.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Environmental
Roham Ghanbari, Alireza Marandi, Ehsan Nazarzadeh Zare
Summary: In this study, a method for the confined growth of metal-organic frameworks (MOFs) in melamine-based COF pores (mCOFs) was proposed. The COF-MOF nanohybrid particles (CXMs) were fabricated, and a Pebax membrane with excellent size sieving and high molecular transport was developed. The CXM/Pebax membrane showed significantly improved CO2/CH4 selectivity and enhanced long-term stability. The optimized membrane achieved a CO2/CH4 selectivity of 44.2 +/- 1.3, surpassing Robeson's upper bounds and maintaining 94% of its initial selectivity in long-term tests, which was 25% higher than the unmodified membrane.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Guining Chen, Xi Chen, Yang Pan, Yufan Ji, Gongping Liu, Wanqin Jin
Summary: Mixed-matrix membranes (MMMs) incorporating M-gallate (M = Ni, Co, Mg) MOF particles were fabricated using 6FDA-based polyimides for ethylene/ethane separation. Among the different MOF particles, Ni-gallate(F) showed the best compatibility with the polyimide, resulting in improved C2H4/C2H6 selectivity and permeability.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Lei Wang, Xianying Bai, Yawei Gu, Xinxin Shi, Shilong Wang, Jingxian Hua, Rujing Hou, Chongqing Wang, Yichang Pan
Summary: 2D metal-organic frameworks are attractive fillers in mixed matrix membranes (MMMs) due to their high aspect ratio and contact opportunity at the filler-polymer interface. However, aligning them in the polymer matrix remains a challenge to fully utilize their functions.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Engineering, Environmental
Junghyun Lee, Chong Yang Chuah, Wen See Tan, Juha Song, Tae-Hyun Bae
Summary: A novel approach utilizing 3D printing of degradable polymer for designing CO2 separation has been reported, resulting in the development of promising 3D monolithic adsorbents with effective CO2 adsorption performance under dynamic flow conditions without experiencing any pressure drop. The stability and regenerability of the adsorbents were successfully demonstrated through repetitive adsorption-desorption cycles, showcasing potential applications in various gas separation processes.
CHEMICAL ENGINEERING JOURNAL
(2022)
Review
Engineering, Environmental
Chong Yang Chuah, Hongju Lee, Tae-Hyun Bae
Summary: This review focuses on the recent progress of nanoporous adsorbents developed for light hydrocarbon separation, which is classified into acetylene separation, alkene/alkane separation, and propyne separation. Adsorptive separation is considered a promising technique with lower energy consumption than conventional processes.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Biochemistry & Molecular Biology
Chong Yang Chuah, Tae-Hyun Bae
Summary: This study focuses on recent advances in mixed-matrix membranes (MMMs) for light hydrocarbon (C-1-C-3) separation based on gas permeability and selectivity, as well as discusses the future research and development direction of MMMs in light hydrocarbon separation considering the low intrinsic gas permeability of polymeric membranes.
Article
Engineering, Chemical
Yechan Lee, Chong Yang Chuah, Jaewon Lee, Tae-Hyun Bae
Summary: A series of porous organic polymers with various functional groups were synthesized and incorporated into a polyimide to fabricate mixed-matrix membranes for CO2/N-2 separation. The functionalized porous fillers improved the separation performance of CO2 significantly, and optimizing both functionality and pore structure further enhanced the separation performance.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Yueping Bao, Nupur Gupta, Chong Yang Chuah, Yen Nan Chuah, Chun-Po Hu, Xiao Hu
Summary: This study reported a novel water gel material for the selective recovery of high concentration PFOA. The results showed that the water gel had a high adsorption capacity and selectivity for PFOA under specific conditions. Additionally, the water gel exhibited pH responsiveness, allowing for easy release of PFOA. Incorporating the water gel into a dense membrane enabled effective separation of colloidal particles in a water system.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Jaewon Lee, Hyeonmin Yang, Giyoung Park, Tae-Hyun Bae
Summary: This study fabricated crosslinked PBI-based OSN membranes with excellent stability under strongly basic conditions. The membranes showed reasonable permeance and sharp molecular discrimination in pure solvents, and their separation performance was reversible at high pH values. These crosslinked PBI membranes hold great potential for OSN applications under basic conditions.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Hyuntak Kwon, Yongju Park, Euntae Yang, Tae-Hyun Bae
Summary: In this study, a high-performance GO-based nanofiltration membrane was developed by intercalating a strong covalent crosslinker into the laminated GO nanosheets, exhibiting outstanding structural stability and improved water permeability.
Review
Engineering, Environmental
Yechan Lee, Yong-Ju Park, Jaewoo Lee, Tae-Hyun Bae
Summary: Separation and purification processes with high energy efficiency are crucial in terms of economy and environment. A membrane contactor (MC) shows promise as a separation and purification platform due to its large contact area, controllable parameters, simplicity, and small footprint. This review discusses the latest MC-based applications, such as gas treatment, methane and ammonia recovery and removal, juice concentration, and dealcoholization, highlighting strategies to enhance performance and addressing challenges for further development and commercialization. The review also emphasizes the versatile role of MCs in bio-refinery processes.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Green & Sustainable Science & Technology
Afiq Mohd Laziz, Chong Yang Chuah, Jens Denecke, Muhammad Roil Bilad, Ku Zilati Ku Shaari
Summary: A microchannel reactor improves mass and heat transfer by creating a high area-to-volume ratio and enhancing mixing through the vortices inside the slug. This study investigated mass transfer using a cross-junction microchannel and observed oil concentration inside the slug using computational fluid dynamics. The results showed oil concentration accumulation in the slug's rear and front regions, and the creation of dead zones due to the formation of four vortices. Optimum flow rate and slug formation significantly influenced mass transfer at low and high flow rates, respectively.
Article
Chemistry, Multidisciplinary
Yeongseo Bak, Geonhyeong Park, Taegyun Hong, Changjae Lee, Hongju Lee, Tae-Hyun Bae, Jesse G. Park, Dong Ki Yoon
Summary: In this study, researchers successfully achieved dynamic control of MOF crystal orientation by combining liquid crystals (LCs) with metal-organic frameworks (MOFs), generating exceptional order parameters. The multidirectional alignment of MOF crystals produced unique patterns with polarized fluorescence, whose intensity depended on the angle of a polarizer, showing potential applications in optical security labels and other optical devices. The alignment mechanism is also applicable to various combinations of MOFs and LCs, including UV polymerizable LC monomers for fabricating free-standing composite films.
Review
Engineering, Chemical
Chong Yang Chuah, Tae-Hyun Bae
Summary: Carbon molecular sieve membranes (CMSMs) have attracted significant research attention due to their ability to overcome the trade-off limitation between permeability and selectivity in gas separation polymeric membranes. This review examines the critical aspects in the development of CMSMs based on polyimide precursors, including pre-treatment, pyrolysis, and post-treatment conditions. It also discusses the mass transfer mechanism, characterization methods, performances against the Robeson upper bound limit, pilot-scale applications, economic analysis, and challenges and perspective of CMSM-based gas separation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Lina Nie, Kunli Goh, Yu Wang, Sadiye Velioglu, Yinjuan Huang, Shuo Dou, Yan Wan, Kun Zhou, Tae-Hyun Bae, Jong-Min Lee
Summary: Membrane technology plays a crucial role in the circular pharmaceutical industry, but organic solvent nanofiltration (OSN) often faces issues with chemically resistant polymeric membranes. To overcome this, a ternary nanoarchitecture was created using multiwalled carbon nanotubes (MWCNTs) intercalated within lanthanum(III) (La3+)-cross-linked SFGO nanochannels to enhance the transport of high viscosity solvents. The resulting membrane demonstrated significantly higher permeance compared to state-of-the-art graphene oxide (GO)-based membranes, even for solvents with higher viscosity. The hyperlooping architecture achieved improved OSN performances, providing potential applications in the pharmaceutical industry.
ACS MATERIALS LETTERS
(2023)
Article
Engineering, Chemical
Jihyun Lee, Chihyuk Ahn, Seungwon Chang, Jaewoo Lee, Tae-Hyun Bae
Summary: Researchers have successfully addressed the trade-off between water flux and salt rejection of reverse osmosis membranes by simultaneously optimizing porous organic polymers and highly porous microstructure support layers. This optimization significantly improves water permeability and salt rejection.
JOURNAL OF MEMBRANE SCIENCE
(2023)
