Article
Engineering, Chemical
Ali K. Sekizkardes, Samir Budhathoki, Lingxiang Zhu, Victor Kusuma, Zi Tong, Joshua S. McNally, Janice A. Steckel, Shouliang Yi, David Hopkinson
Summary: The research investigated the molecular-level structure-property relationship in PIM-based blend membranes, finding that using polyphosphazenes with higher ether side chain concentrations can improve compatibility with PIM-1. The experimentally fabricated blend membranes showed high CO2 permeability and improved CO2/N-2 selectivity.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Shuai Tan, Difan Zhang, Manh-Thuong Nguyen, Vaithiyalingam Shutthanandan, Tamas Varga, Roger Rousseau, Grant E. Johnson, Vassiliki-Alexandra Glezakou, Venkateshkumar Prabhakaran
Summary: The functionalization of GO membranes with ILs provides a promising approach for efficient ion separation and critical material recovery. The ILs in the membranes act as spacers, reducing cation mobility and promoting ion desolvation, resulting in an increased water flux. The high separation efficiency of the IL/GO membranes is attributed to the synergistic modification of hydrophobicity and surface charge.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Zahra Negaresh, Mostafa Fazli, Seyed Majid Hashemianzadeh
Summary: This study investigates the capability of H-passivated nanoporous graphene as a membrane for carbon dioxide and nitrogen separation using a reactive force field. The effect of pore size and shape on separation is examined, and the selectivity of different pores is assessed. The simulation results show that H-modified graphene membrane with a pore diameter of about 2.4 angstrom exhibits the best separation selectivity.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Chemistry, Physical
Jinbo Cai, Linghong Lu, Jiabao Zhu, Zhengsong Weng
Summary: This study investigates the effects of different ionic liquids (ILs) and graphene pore sizes on CO2/CH4 separation performance using molecular dynamics simulations. The results show that the choice of IL and pore size significantly impact the membrane's separation performance. Increasing the charge of the pore atoms can greatly improve the selectivity for CO2.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Engineering, Environmental
Mojtaba Mehdinia Lichaei, Farhang Pazani, Abdolreza Aroujalian, Denis Rodrigue
Summary: This study presents a simple method to improve CO2/N2 separation by preparing mixed matrix membranes (MMM) based on Pebax with functionalized/oriented graphene oxide (GO) nanosheets. The results show that modifying the surface of GO nanosheets with m-phenylenediamine leads to increased CO2 permeability in the membranes. Additionally, applying an external electric field to orient the GO nanosheets further enhances the CO2 permeability.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
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
Biochemistry & Molecular Biology
Chong Yang Chuah, Junghyun Lee, Juha Song, Tae-Hyun Bae
Summary: By incorporating different carbon-based fillers into polymer matrices, the CO2 permeability of mixed-matrix carbon molecular sieve membranes can be improved. In this study, 15 wt % YP-50F and 15 wt % GO fillers in the mixed polymer matrix demonstrated superior CO2/N-2 separation performance.
Article
Engineering, Chemical
Peng Xu, Xiaochun Zhang, Linlin Zhao, Zhenlei Wang, Yawei Liu, Lu Bai, Zhiping Liu
Summary: MXene-based membranes with an ultrathin layer of ionic liquid show enhanced gas separation performance, with the thickness of the ionic liquid film affecting the selectivity. The MXene-slit width has less influence on gas permeance but affects the CO2/N2 selectivity. A composite membrane composed of MXene with an 8 angstrom slit and 40 pairs of ionic liquid exhibits the best CO2/N2 separation performance.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Sylvie Neyertz, Nieck E. Benes, David Brown
Summary: Molecular dynamics simulations have shown that hybrid inorganic-organic membranes based on POSS or OAPS silsesquioxanes can maintain good selectivity for CO2/N2 and CO2/CH4 separation at high temperatures and pressures. PolyPOSS-imides degrade above 300 degrees C, while polyOAPSimides can resist up to above 400 degrees C. PolyOAPS/POSS-imide networks have been further tested for their gas separation abilities of H2S-containing mixtures, and it has been found that H2S has a high solubility in the networks at 300 degrees C. The denser polyPOSS-imides show better sieving properties than the more open polyOAPS-imides.
JOURNAL OF MEMBRANE SCIENCE
(2023)
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
Niping Ma, Ke Xu, Jianhua Guo, Ning Wei, Junxia Yan
Summary: Molecular dynamics simulations were used to explore the sizes and distributions of nanopore/channels in graphene oxide (GO) membranes and the relationship between GO flakes size and membrane thickness. It was found that the size of GO flakes affects the distribution of nanopore sizes in GO membranes, but does not significantly impact the total nanopore area in membranes with the same thickness. The study also confirmed that the total nanopore area of GO membranes decreases exponentially as the membrane thickness increases. A columnar-array substrate model was developed to create customized GO membranes for specific filtration functions. These findings provide insights into the design of functional membranes for energy and environmental applications, and offer guidance for the practical application of GO membranes in separation and filtration.
Article
Engineering, Chemical
Sajjad Mohsenpour, Ahmed W. Ameen, Sebastian Leaper, Clara Skuse, Faiz Almansour, Peter M. Budd, Patricia Gorgojo
Summary: PIM-1 mixed matrix membranes (MMMs) fabricated with POSS and GO-POSS show higher CO2 permeability and good selectivity, surpassing the 2008 Robeson upper bound, and can slow down physical aging.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Fang Yan, Yandong Guo, Zhenlei Wang, Linlin Zhao, Xiaochun Zhang
Summary: Ionic liquids (ILs)/graphene oxide (GO) membranes are a promising alternative for CO2 separation. This study investigates the correlation between the microstructure of ILs/GO and CO2 separation performance using molecular dynamics simulation. The results show that a dense cation adsorption layer forms near GO, facilitating CO2 adsorption. CO2/CH4 mainly distributes around the ILs area of the membrane, improving gas selectivity. Decreasing the layer spacing increases solubility selectivity but may decrease diffusion selectivity. Low viscosity ILs enhance diffusion selectivity. [Bmim][TF2N]/GO membrane is predicted to have superior CO2/CH4 separation performance.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Chong Yang Chuah, Junghyun Lee, Yueping Bao, Juha Song, Tae-Hyun Bae
Summary: Nano-sized PS-MFI, ETS-10 and SAPO-34 zeolites were used as CO2-selective fillers in high-performance mixed-matrix carbon molecular sieve membranes for CO2/N-2 separation. The in-house polyimide precursor ODPA-TMPDA was employed for the membranes, leading to improved gas permeability. Zeolite-filled CMSMs showed enhanced CO2 permeability and selectivity, especially with SAPO-34 outperforming the Robeson upper bound for CO2/N-2 separation.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Environmental
Shania Sharif, Khuram Shahzad Ahmad, Faisal Rehman, Zubeda Bhatti, Khalid Hussain Thebo
Summary: Membrane-based technology has gained significant interest for its potential applications in water purification and desalination, with two-dimensional graphene oxide (GO) and its derivatives being considered the most suitable material for membrane technology due to their exceptional properties. Challenges and future directions for such membranes will be discussed in detail.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
