Article
Engineering, Chemical
Yuhe Cao, Kuang Zhang, Chen Zhang, William J. Koros
Summary: This study presents an economically viable method to fabricate composite nanoparticle-containing carbon molecular sieve hollow fiber membranes with excellent gas separation performance through a coating process.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Physical
Jong Geun Seong, Jeremy C. Lewis, John A. Matteson, Erica Craddock, Ulises Martinez, Harshul Thakkar, Angelica D. Benavidez, Kathryn A. Berchtold, Rajinder P. Singh
Summary: Polymer membrane carbonization is a promising strategy for obtaining carbon molecular sieve (CMS) membrane materials with tailorable cavity size distributions. In this study, highly O-2 permselective CMS hollow fiber membranes (HFMs) derived from rigid PBI materials were fabricated and evaluated for O-2/N-2 separation performance.
Article
Engineering, Chemical
Lujie Sheng, Jizhong Ren, Dan Zhao, Hui Li, Kaisheng Hua, Maicun Deng
Summary: The study investigated the structural evolution and gas separation performance changes of P84 HFMs from polymer to carbonization stages, revealing that the substructure of P84 HFMs began to collapse during the intermediate stage, which affected the gas permeance of P84 CMS HFMs.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Yang Han, W. S. Winston Ho
Summary: This review discusses the fundamentals of CO2/gas separation in polymeric membranes and explores the opportunities and challenges for various applications such as post-combustion carbon capture, hydrogen purification, and gas sweetening. It also highlights emerging polymeric membrane materials and promising candidates for CO2 separation applications, while comparing permeability-selectivity data against their upper bounds in 2008 and 2019.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Ayesha Raza, Mohammad Askari, Can Zeng Liang, Na Peng, Sarah Farrukh, Arshad Hussain, Tai-Shung Chung
Summary: This study developed a new dual-layer hollow fiber membrane for CO2 separation with high permeance and selectivity, showing a high CO2/CH4 selectivity. This newly developed membrane may have great potential for CO2/CH4 separation.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Polymer Science
Yasser A. Shalabi, Garba O. Yahaya, Seung-Hak Choi, Abdulkarim Alsamah, Ali Hayek
Summary: Researchers are investigating the potential of using polymeric membranes to remove acid gases from natural gas, in order to reduce energy consumption and carbon emissions. Placing a polymeric membrane unit upstream of the amine scrubbing column can reduce energy consumption during the regeneration process. The preparation of hollow fiber polymeric membranes is crucial for industrial implementation in natural gas processing.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Engineering, Chemical
Lu Liu, Dongxia Liu, Chen Zhang
Summary: This study demonstrates that polyimide-derived asymmetric carbon molecular sieve (CMS) hollow fiber membranes exhibit outstanding H-2/C3H8 separation performance at high temperatures, making them potentially attractive for catalytic propane dehydrogenation membrane reactors. By controlling the mixture of hydrogen and propane, stable performance of CMS membranes under high-temperature conditions can be achieved.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Linfeng Lei, Arne Lindbrathen, Magne Hillestad, Xuezhong He
Summary: Asymmetric carbon molecular sieve (CMS) membranes prepared from cellulose hollow fiber precursors show excellent separation performance and high stability for H2/CO2 separation. A two-stage carbon membrane system is found to be technologically and economically feasible for producing high-purity H2. It is suggested that higher operating temperatures are needed to achieve higher purity hydrogen.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Wulin Qiu, Liren Xu, Zhongyun Liu, Yang Liu, Pezhman Arab, Mark Brayden, Marcos Martinez, Junqiang Liu, Abhishek Roy, William J. Koros
Summary: The study demonstrates successful recovery of aged carbon molecular sieve (CMS) fibers through super-hyperaging technique, achieving satisfactory propylene permeance with optimal selectivity. A super-hyperaging temperature of around 280 degrees Celsius is shown to provide the best balance between permeance and selectivity. The regenerated CMS membrane surpasses the polymer permeance-selectivity tradeoff upper bound, with a hypothetical mechanism for the super-hyperaging recovery of aged CMS fibers discussed.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Tae Hoon Lee, Farhad Moghadam, Jae Gu Jung, Yu Jin Kim, Ji Soo Roh, Seung Yeon Yoo, Byung Kwan Lee, Jin Hee Kim, Ingo Pinnau, Ho Bum Park
Summary: A versatile approach to fabricate hybrid CMS membranes with unique textural properties and tunable ultramicroporosity is proposed in this study. The HCMS membranes exhibit superior gas separation performances compared to conventional polymers and CMS membranes, especially for closely sized gas pairs. This development demonstrates practical feasibility for use in industrial mixed-gas operation conditions.
Article
Engineering, Chemical
Can Zeng Liang, Wai Fen Yong, Ji Wu, Martin Weber, Christian Maletzko, Juin-Yih Lai, Tai-Shung Chung
Summary: In this study, a newly designed polymer, PTPES, was reported to significantly increase propylene permeance and propylene/propane selectivity through the plasticization effect. This was attributed to the plasticization-enlarged molecular sieving effect caused by the trimethylbenzene moieties in the polymer chains. This research provides new insights into the gas transport mechanisms of membrane materials and may inspire the development of new-generation polymeric materials and membranes for propylene/propane and other gas separations.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Physical
Pezhman Arab, Zhongyun Liu, Mostafa Nasser, Wulin Qiu, Marcos Martinez, Derrick Flick, Abhishek Roy, Junqiang Liu, William J. Koros
Summary: Economically scalable carbon molecular sieve (CMS) hollow fiber membranes rely on tunable bimodal pore morphology to separate gas pairs based on angstrom-level size discrimination. The self-retarding physical aging process of CMS membranes affects gas separation efficiency, particularly in the tightening of ultramicropore size ranges. Understanding and controlling the aging process within CMS membranes can be generalized to other precursor-derived CMS membranes for improved gas separation performance.
Article
Engineering, Environmental
Adele Brunetti, Linfeng Lei, Elisa Avruscio, Dionysis S. Karousos, Arne Lindbrathen, Evangelos P. Kouvelos, Xuezhong He, Evangelos P. Favvas, Giuseppe Barbieri
Summary: This study systematically investigated the separation performance of cellulose-based carbon hollow fiber membranes under real biogas upgrading conditions. The membranes exhibited good CO2/CH4 selectivity and durability against H2S and water vapor.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Khalid Hazazi, Yingge Wang, N. M. Srivatsa Bettahalli, Xiaohua Ma, Yan Xia, Ingo Pinnau
Summary: Hydrogen, an emerging energy source, has a wide range of applications and can be produced in conjunction with CO2. Carbon molecular sieve (CMS) membranes prepared by membrane technology show excellent gas separation performance for hydrogen/carbon dioxide separation, making them a promising solution for a more sustainable hydrogen economy.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Environmental
Yu-Ting Lin, Jing-Yi Li, Hui-Hsin Tseng, Ming-Yen Wey
Summary: The aim of this study is to determine the optimal carbonization conditions for carbon hollow fiber membranes for hydrogen purification. Three different carbonization atmospheres were examined, and their effects on the microstructure and gas permeation properties of the membranes were analyzed. The results showed that the carbon membrane with an ordered microstructure and larger pore volume exhibited the best separation capability and aging resistance.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Chemical
Jiangying Liu, Yang Pan, Jingyi Xu, Zhenggang Wang, Haipeng Zhu, Gongping Liu, Jing Zhong, Wanqin Jin
Summary: To achieve high separation efficacy of carbon dioxide, Pebax-based membranes have attracted intensive interest. An amphipathic copolymer polydimethylsiloxane(PDMS)-block-polyethylene oxide(PEO) was introduced into the intermediate layer to tune the interfacial adhesion, enabling fabrication of ultra-thin Pebax composite membrane. The strategy of using the amphipathic copolymer as an intermediate layer enhanced the composite membrane integrity and simplified the plasma pre-treatment, showing great potential in developing highly permeable membrane for efficient CO2 capture.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Chemical
Quan Liu, Xian Wang, Yanan Guo, Gongping Liu, Kai-Ge Zhou
Summary: Graphene-based membranes with tunable apertures and functional groups have shown potential in ethanol/water separation. Pristine graphene exhibits reverse-selective behavior due to preferential adsorption for ethanol. Ethanol-permselective process is initiated by ethanol-enriched and water-barren pores. In contrast, hydroxylated graphene membranes prefer water molecules due to molecular sieving and functional-group attraction. The study provides insights into the reverse-selective mechanism of porous graphene membranes and a new avenue for efficient biofuel production.
FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Chemical
Quan Liu, Minggong Chen, Guining Chen, Xiaoyue Yao, Gongping Liu, Rong Xu, Wanqin Jin
Summary: In this study, flexible graphdiyne membranes with various functional groups were computationally designed to gain insights into CO2 capture and H2 purification. The hydroxylated GDY-OH and aminated GDY-NH2 membranes show unprecedented performance for both CO2 and H2 separation.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Chemical
Yangyang Mao, Jingyi Xu, Huimin Chen, Guozhen Liu, Zhengkun Liu, Long Cheng, Yanan Guo, Gongping Liu, Wanqin Jin
Summary: A novel porous and hydrophobic MOF-801@GO-PDMS membrane with enhanced water vapor transport for water desalination has been developed. The membrane showed high water flux and salt rejection, as well as robust stability, making it a promising candidate for water desalination.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Chemistry, Physical
Guozhen Liu, Yanan Guo, Cailing Chen, Yong Lu, Guining Chen, Gongping Liu, Yu Han, Wanqin Jin, Nanping Xu
Summary: A high-probability theoretical coordination strategy is proposed and demonstrated to eliminate lattice defects in metal-organic framework (MOF) membranes. This strategy increases the ratio of ligands to metal clusters, enabling the creation of high-connectivity MOF membranes with angstrom-sized lattice apertures. The resulting membranes exhibit high and stable separation performance for gases, water desalination, and an organic solvent azeotrope.
Article
Engineering, Chemical
Guozhen Liu, Renhao Li, Xi Chen, Long Cheng, Yu Liu, Gongping Liu, Wanqin Jin
Summary: Carbon molecular sieve (CMS) membranes derived from 6FDA-DAM polyimide exhibit improved gas separation efficiency with increasing pyrolysis temperature, leading to densification of the pore structure and enhanced size-sieving effect. Membranes pyrolyzed at higher temperatures are more susceptible to physical aging, but pre-aging treatment can improve and stabilize gas separation performance beyond the upper limit of polymeric membranes. The gas permeation behavior of CMS membranes is dominated by diffusion, making tailoring of gas permeation and physical aging a viable approach to tune their gas transport properties.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Quan Liu, Minggong Chen, Longlong Sun, Gongping Liu, Rong Xu
Summary: The study investigates the effect of pore density (PPI) on the separations of water/ethanol and methanol/ethanol mixtures through graphene oxide (GO) membranes. It is found that the fluxes of water and methanol linearly increase with PPI due to enhanced diffusivity and reduced permeation barrier. However, large PPIs sacrifice separation factors. The study provides a theoretical basis for designing high-performance GO membranes for ethanol dehydration and methanol recovery.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Biotechnology & Applied Microbiology
Song Liu, Guozhen Liu, Guining Chen, Gongping Liu, Wanqin Jin
Summary: This review article mainly introduces the great potential of 2D material membranes in molecular separation and the challenges and opportunities in their scale-up fabrication. The scalable fabrication methods and their pros and cons are critically reviewed, and the separation performance of large-area 2D material membranes is summarized. Finally, perspectives on the scale-up fabrication of 2D material membranes are provided to the readers.
CURRENT OPINION IN CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Rong Xu, Xin Liu, Chunhui Zhu, Yang Pan, Shixin Cheng, Xiuxiu Ren, Meng Guo, Jing Zhong, Quan Liu, Gongping Liu
Summary: A new amine-functionalized UiO-66/organosilica mixed-matrix membrane was developed for pervaporation water desalination, showing enhanced hydrophilicity and dense network structure, resulting in improved water flux and NaCl rejection. The membrane exhibited excellent structural stability and high water permeance of >3.1 x 10-6 mol m-2 s-1 Pa-1 combined with NaCl rejection of >99.9% under continuous operation. The proposed membrane has great potential for concentrated brine desalination.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Rong Xu, Shixin Cheng, Xu Cheng, Lv Qi, Jing Zhong, Gongping Liu, Meina Huang, Priyanka Wasnik, Qinglong Jiang
Summary: A new strategy is proposed to enhance the performance of hybrid organosilica membranes by in situ carboxyl functionalization. The introduced carboxyl functionalities result in a compact pore structure and improved water affinity, leading to an increased membrane permeability without compromising water/salt selectivity in reverse osmosis. The carboxyl functionalized organosilica membrane also demonstrates high durability during continuous reverse osmosis desalination, showing great potential for environmental and industrial applications as an efficient and robust molecular separation membrane.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Guining Chen, Guozhen Liu, Yang Pan, Gongping Liu, Xuehong Gu, Wanqin Jin, Nanping Xu
Summary: This article provides a brief overview of the importance and fabrication approaches of zeolites and metal-organic frameworks (MOFs) as adsorbents and membranes. It explores the separation mechanisms based on pore sizes and the chemical properties of nanochannels and emphasizes the judicious selection and design of zeolites and MOFs for gas separation purposes. Additionally, it discusses the feasibility of zeolites and MOFs for gas separation from adsorption to membrane separation and addresses the challenges and perspectives of this cutting-edge area.
CHEMICAL SOCIETY REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Guozhen Liu, Zhenggang Wang, Cailing Chen, Jiahui Li, Guangyuan Zhou, Wenqi Ji, Gongping Liu, Wanqin Jin
Summary: Well-intergrown polycrystalline UiO-66 membranes were successfully synthesized under mild synthesis conditions, showing great potential for intensification of esterification reaction with fast water selective transport channels and high solvent dehydration performance.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Yuefeng Duan, Yuhang Huang, Chongqing Wang, Qian Wang, Kai Ge, Zhiyong Lu, Huijie Wang, Jingui Duan, Junfeng Bai, Wanqin Jin
Summary: Researchers have finely tuned a new family of MOFs with carboxylic pincers to separate ethylene and acetylene efficiently, achieving high selectivity and purity of the products. This work provides a novel approach for designing high-performance MOFs by selectively binding small molecular clusters.
Article
Materials Science, Multidisciplinary
Chen Zhang, Gaurav M. Iyer
Summary: In this study, ultramicroporous carbon molecular sieve (CMS) membranes derived from uncrosslinked aramid were used for precise hydrogen sieving, achieving ultrahigh H2/CO2 selectivity exceeding all known CMS membranes. The excellent solution processability of uncrosslinked aramids enabled the fabrication of scalable CMS hollow fiber membranes. This work opens up new possibilities for highly selective CMS membranes for H2 separation and CO2 capture.
ACS MATERIALS LETTERS
(2023)
Article
Engineering, Chemical
Jiahui Li, Jiali Yu, Guining Chen, Haipeng Zhu, Guozhen Liu, Ying Xie, Gongping Liu, Wanqin Jin
Summary: This review provides a comprehensive overview of the stability considerations associated with MFI zeolite-based membranes. The mechanisms for insufficient stability, strategies to enhance stability, and potential opportunities and challenges are discussed.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)