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1. Mixed-matrix carbon molecular sieve membranes using hierarchical zeolite: A simple approach towards high CO2 permeability enhancements

Author:
Chuah, Chong Yang,   et al.   ; Li, Wen; Goh, Kunli; Bae, Tae-Hyun;     Show all 4 Authors
Source:
Journal of membrane science 2019 v.588 pp. 117220
ISSN:
0376-7388
Subject:
artificial membranes; carbon; carbon dioxide; carbonization; cost effectiveness; energy efficiency; methane; permeability; porous media; zeolites
Abstract:
... Membrane process is a robust technology for CO2/CH4 separation. To achieve the energy-efficiency necessary for a cost-effective membrane-based CO2/CH4 separation, high-performance membranes are often desirable. There are several approaches that can be undertaken to realize such membranes. In this study, we amalgamated three strategies: 1) filler design optimization by synthesizing hierarchical zeo ...
DOI:
10.1016/j.memsci.2019.117220

2. Enhancing the mechanical strength and CO2/CH4 separation performance of polymeric membranes by incorporating amine-appended porous polymers

Author:
Chuah, Chong Yang,   et al.   ; Yang, Yanqin; Nie, Lina; Bae, Tae-Hyun;     Show all 4 Authors
Source:
Journal of membrane science 2019 v.569 pp. 149-156
ISSN:
0376-7388
Subject:
adhesion; asymmetric membranes; carbon dioxide; methane; permeability; polymers; porosity; tensile strength; zeolites
Abstract:
... The incorporation of solid fillers into mixed matrix membranes (MMMs) is a promising approach to overcome the permeability-selectivity trade-off characteristic of polymeric membranes. However, MMMs that contain conventional fillers (e.g., zeolites, silicas, and porous carbons) usually exhibit defects due to incompatible interfaces between fillers and glassy polymers. High porosity and good robustn ...
DOI:
10.1016/j.memsci.2018.10.018

3. Scalable fabrication of graphene-based laminate membranes for liquid and gas separations by crosslinking-induced gelation and doctor-blade casting

Author:
Chuah, Chong Yang,   et al.   ; Yang, Euntae; Karahan, H. Enis; Goh, Kunli; Wang, Rong; Bae, Tae-Hyun;     Show all 6 Authors
Source:
Carbon 2019 v.155 pp. 129-137
ISSN:
0008-6223
Subject:
calcium; carbon dioxide; ceramics; dispersions; dyes; gases; gelation; graphene; graphene oxide; industrial applications; ions; iron; liquids; nanofiltration; nitrogen; polyethylene glycol; polyethyleneimine; slurries; sonication
Abstract:
... Graphene-based laminate membranes have recently demonstrated unique advantages over the traditional separation membranes made of polymers or ceramics. For both gas and liquid separations, various designs of crosslinker-stabilized graphene oxide (GO) membranes have been reported. However, the preparation methods used for those are poorly scalable for industrial applications. Herein, we report the f ...
DOI:
10.1016/j.carbon.2019.08.058

4. Sub-Ångström-level engineering of ultramicroporous carbons for enhanced sulfur hexafluoride capture

Author:
Chuah, Chong Yang,   et al.   ; Yang, Yanqin; Goh, Kunli; Karahan, H. Enis; Birer, Özgür; Bae, Tae-Hyun;     Show all 6 Authors
Source:
Carbon 2019 v.155 pp. 56-64
ISSN:
0008-6223
Subject:
adsorption; carbon; carbon dioxide; engineering; ions; melamine; phenolic resins; sulfur hexafluoride
Abstract:
... Ultramicroporous carbon materials are realized by exploiting nitrogen-doping and alkali ions activation strategies on classical carboxylic phenolic resins. Through tuning the nitrogen-doped content as well as activation strength and size of the alkali ions, carbon materials present pore sizes that are controlled at the sub-Ångström level from 5.8 to 7.7 Å with precision between 0.1 and 0.4 Å. The ...
DOI:
10.1016/j.carbon.2019.08.034

5. Hierarchically Porous Co-MOF-74 Hollow Nanorods for Enhanced Dynamic CO₂ Separation

Author:
Chuah, Chong Yang,   et al.   ; Zhang, Xiahui; Dong, Panpan; Cha, Young-Hwan; Bae, Tae-Hyun; Song, Min-Kyu;     Show all 6 Authors
Source:
ACS applied materials & interfaces 2018 v.10 no.50 pp. 43316-43322
ISSN:
1944-8252
Subject:
active sites; adsorption; carbon dioxide; chromatography; coordination polymers; crystals; desorption; nanorods
Abstract:
... Metal–organic frameworks (MOFs) with coordinatively unsaturated (open) metal sites have been intensively investigated in gas separations because their active sites can selectively interact with targeted molecules such as CO₂. Although such MOFs have shown to exhibit exceptional CO₂ uptake capacity at equilibrium, the dynamic separation behavior is often not satisfactory to be considered in practic ...
DOI:
10.1021/acsami.8b17180

6. Hierarchically Structured HKUST-1 Nanocrystals for Enhanced SF6 Capture and Recovery

Author:
Chuah, Chong Yang,   et al.   ; Goh, Kunli; Bae, Tae-Hyun;     Show all 3 Authors
Source:
The Journal of Physical Chemistry C 2017 v.121 no.12 pp. 6748-6755
ISSN:
1932-7455
Subject:
active sites; adsorbents; adsorption; carbon; coordination polymers; energy; industrial applications; models; nanocrystals; porous media; sulfur hexafluoride; surface area; zeolites
Abstract:
... HKUST-1, an inexpensive metal–organic framework possessing open metal sites, has a great potential for capture and recovery of SF₆. In this work, the structural property of HKUST-1 was modified to yield a hierarchically structured HKUST-1 nanocrystal exhibiting a superior performance with higher SF₆ uptake (4.98 mmol g–¹ at 25 °C and 1 bar), better SF₆/N₂ selectivity (∼70 at 25 °C), faster SF₆ ads ...
DOI:
10.1021/acs.jpcc.7b00291

7. Harnessing Filler Materials for Enhancing Biogas Separation Membranes

Author:
Chuah, Chong Yang,   et al.   ; Goh, Kunli; Yang, Yanqin; Gong, Heqing; Li, Wen; Karahan, H. Enis; Guiver, Michael D.; Wang, Rong; Bae, Tae-Hyun;     Show all 9 Authors
Source:
Chemical reviews 2018 v.118 no.18 pp. 8655-8769
ISSN:
1520-6890
Subject:
asymmetric membranes; biogas; carbon dioxide; climate change; energy; engineering; methane; polymers; water treatment
Abstract:
... Biogas is an increasingly attractive renewable resource, envisioned to secure future energy demands and help curb global climate change. To capitalize on this resource, membrane processes and state-of-the-art membranes must efficiently recover methane (CH₄) from biogas by separating carbon dioxide (CO₂). Composite (a.k.a. mixed-matrix) membranes, prepared from common polymers and rationally select ...
DOI:
10.1021/acs.chemrev.8b00091

8. Polymer-fluorinated silica composite hollow fiber membranes for the recovery of biogas dissolved in anaerobic effluent

Author:
Chuah, Chong Yang,   et al.   ; Wongchitphimon, Sunee; Rongwong, Wichitpan; Wang, Rong; Bae, Tae-Hyun;     Show all 5 Authors
Source:
Journal of membrane science 2017 v.540 pp. 146-154
ISSN:
0376-7388
Subject:
asymmetric membranes; biogas; chemical bonding; hydrophobicity; mass transfer; methane; methane production; models; polypropylenes; porosity; silica; strength (mechanics); tap water
Abstract:
... In this study, polymer-fluorinated silica composite hollow fiber membranes were fabricated and applied to a membrane contactor system for the recovery of methane dissolved in the anaerobic effluent. Such composite membranes allowed us to tailor the physical property such as porosity and mechanical strength and the surface hydrophobicity in separated processes. To develop the composite membranes, p ...
DOI:
10.1016/j.memsci.2017.06.050