Article
Engineering, Chemical
Gholamreza Vahedi Sarrigani, Jia Ding, Amirali Ebrahimi Ghadi, David Alam, Paul Fitzgerald, Dianne E. Wiley, David K. Wang
Summary: This study investigates the application of tubular polyetherimide (PEI) membranes prepared by dip-coating and multilayer assembly techniques in CO2 and H2 transport and CO2/N2 and H2/N2 selectivity. The results show that the permeability and selectivity of the membranes depend on the deposition cycle during dip-coating. For binary gas mixture separation, 100% CO2 and H2 purity is achieved regardless of the feed gas concentration. The PEI membrane exhibits interfacial confinement phenomenon, and the subtle change in imide group conformation contributes to increased polymer amorphicity and exclusive H2 and CO2 transport.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Saeed Ashtiani, Zdenek Sofer, Filip Prusa, Karel Friess
Summary: The unique CNT-ZIF-8-PDMS composite membranes with aligned ZIF-8 arrays on CNT surface act as an effective buffering layer for enhanced gas transport, showing outstanding gas separation performance with high permeabilities for CO2 and C3H6. The addition of thin PDMS layer improves mechanical and thermal stability of the composite, leading to a significant increase in elongation and a reduction in mass. The composite membranes exhibit great potential for targeted gas separation applications, surpassing the 2008 Robeson upper bounds for selectivities of various gas pairs.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Biotechnology & Applied Microbiology
Samy Yousef, Justas Sereika, Andrius Tonkonogovas, Tawheed Hashem, Alaa Mohamed
Summary: This research aims to study the influence of high temperatures and pressure on the selectivity performance of Polyethersulfone (PES) membranes for CO2/N2, CO2/H2, and CO2/CH4, and their potential applications in biogas upgrading systems. The results showed that low pressure and high temperature can enhance the selectivity performance and improve gas permeability. PES membranes are considered a promising technology for biogas upgrading with high selectivity, especially at high separation temperatures and low pressure.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Chemistry, Multidisciplinary
Baoju Li, Zitao Wang, Zhuangzhuang Gao, Jinquan Suo, Ming Xue, Yushan Yan, Valentin Valtchev, Shilun Qiu, Qianrong Fang
Summary: Covalent organic frameworks (COFs) are promising engineering materials for molecular sieving membranes. However, their insolubility and high melting temperature pose challenges for COF-based membrane (COFM) fabrication. This study reports a new synthetic strategy to prepare continuous and intact self-standing COFMs with excellent selectivity and ultrahigh H-2 permeance, surpassing previous COFMs. Furthermore, a theoretical study explains the remarkable separation performance of H-2/CO2 through COFMs.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Chemical
Mide Luo, Zong Lu, Yali Zhao, Yufei Wang, Yanying Wei, Haihui Wang
Summary: In this work, tubular 2D MXene membranes were successfully prepared on commercial porous stainless steel substrates via fast electrophoretic deposition. The prepared membranes showed advantages of simple operation, high membrane assembly efficiency, and ease for scale-up. These tubular MXene membranes exhibited excellent gas separation performance with high hydrogen permeance and selectivity. Importantly, this work provides valuable reference for the development of other 2D material-based membranes for future applications.
Article
Engineering, Chemical
Kai Qu, Liheng Dai, Yongsheng Xia, Yixing Wang, Dezhu Zhang, Yulin Wu, Zhizhen Yao, Kang Huang, Xuhong Guo, Zhi Xu
Summary: The study successfully fabricated self-crosslinked MXene hollow fiber membranes using a simple thermal treatment process, demonstrating improved molecular sieving performance.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Qiushi Wei, Jolie M. Lucero, James M. Crawford, J. Douglas Way, Colin A. Wolden, Moises A. Carreon
Summary: ZIF-21 membranes were synthesized for the separation of ammonia from nitrogen and hydrogen, with high permeances and selectivities. The key separation mechanisms were identified as differences in adsorption and diffusivities, along with the polar-polar interaction between ammonia and the linker polar channels.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Lun Shu, Yuan Peng, Rui Yao, Hongling Song, Chenyu Zhu, Weishen Yang
Summary: A facile strategy has been developed to construct defect-free and flexible metal-organic framework (MOF)-based membranes with high selectivity. The fabricated soft-solid MOF composite membranes showed excellent separation performance for H-2/CO2 separation. This study demonstrates the potential of MOF-based membranes in practical separation applications.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Engineering, Chemical
Xilu Hong, Zong Lu, Yali Zhao, Luxi Lyu, Li Ding, Yanying Wei, Haihui Wang
Summary: A new freestanding MXene-ZIF-8 dual-layered membrane was reported for efficient hydrogen separation, synthesized rapidly using electrophoretic deposition and fast current-driven synthesis techniques. The membrane exhibited significantly improved gas separation performance within a short period of time.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Yonghong Wang, Yi Zhou, Xinru Zhang, Yin Gao, Jinping Li
Summary: By incorporating microporous sodium zeoliteY (NaY) into sulfonated poly (ether ether ketone) (SPEEK), mixed-matrix membranes (MMMs) for CO2/N2 separation were successfully engineered with improved gas separation properties. The even distribution of NaY particles in the SPEEK matrix forming nanochannels enhanced CO2 permeability and selectivity, leading to superior separation performance compared to pristine SPEEK membranes.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Polymer Science
Angel de J. Montes Luna, Nidia C. Fuentes Lopez, Griselda Castruita de Leon, Odilia Perez Camacho, Claudia Y. Yeverino Miranda, Yibran A. Perera Mercado
Summary: In this study, polybenzimidazole (PBI) and natural zeolite-based mixed matrix membranes (MMMs) were prepared and their transport properties for binary and ternary mixed-gas separation were investigated. The MMMs showed improved perm-selectivity properties compared to the PBI polymeric membranes, favoring the permeation of CO2 and N-2. Through thermal properties analysis and X-Ray Diffraction, it was found that the MMMs membranes have higher thermal stability and the zeolite signals combine with the amorphous dome from the polymeric matrix.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Soon-Chien Lu, Thakorn Wichidit, Thanitporn Narkkun, Kuo-Lun Tung, Kajornsak Faungnawakij, Chalida Klaysom
Summary: Aminosilane functionalization is used to improve the dispersion and adhesion of nano-sized zeolite Y (ZeY) particles in polyether block amide (Pebax). The addition of 5 wt.% of aminosilane-modified zeolite Y (Mo-ZeY) enhances the gas permeability and CO2/CH4 separation factor of Pebax mixed matrix composite hollow fiber membranes by over 100% and 35% respectively.
Review
Energy & Fuels
Fayez Nasir Al-Rowaili, Mazen Khaled, Aqil Jamal, Umer Zahid
Summary: Membrane technology plays a significant role in the separation processes of modern industries, especially in gas separation. Mixed matrix membranes (MMMs) have been widely studied and applied to improve the gas separation performance. This paper reviews the choice of advanced materials, recent research developments, and applications of MMMs in gas separation, with a focus on H2/CO2.
Article
Engineering, Chemical
Yonghong Wang, Juanjuan Wang, Xinru Zhang, Jinping Li, Long Li
Summary: In this study, a ZIF-8-decorated metakaolin (ZIF-8-d-MK) hybrid was successfully prepared and coated on polysulfone ultrafiltration membranes to efficiently separate CO2 from N-2. The well-dispersed ZIF-8-d-MK in the PVAm matrix showed strong interaction with the polymer matrix, leading to improved CO2 permeance and selectivity. The molecular sieving effect of ZIF-8-d-MK contributed to the enhanced separation performance of MMCMs under both pure gas and mixed gas feed conditions.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Aotong Gao, Xueru Yan, Shenzhen Cong, Xiaoyan Wang, Hefang Liu, Zhi Wang, Xinlei Liu
Summary: Researchers have developed a 50 nm thick benzimidazole-linked polymer (BILP) membrane with H2-selective channels based on the controllable formation of benzimidazole rings and precise manipulation of spacing among polymer chains. The highly-selective BILP membranes exhibit H2/CO2 selectivity of up to 56.3 (with a corresponding H2 permeance of 127 GPU). Highly-permeable BILP membranes deliver H2 permeance up to 439 GPU (with a corresponding selectivity of 28.5), surpassing the upper bounds of traditional polymer membranes. The membranes also demonstrate outstanding thermal (e.g. 300 degrees C) and pressure resistance.
JOURNAL OF MEMBRANE SCIENCE
(2023)
