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Article ; Online: One-step uranium extraction and brine desalination via adsorptive pervaporation by graphene-oxide scaffold membranes

Wang, Guangcheng / Shi, Gui Min / Zhang, Sui

Journal of Hazardous Materials. 2023 Sept., v. 457, p. 131822

2023 , Page(s) 131822

Abstract: The ocean reserves nearly four billion tons of uranium, providing an inexhaustible supply of nuclear energy if the limits of ultralow U(VI) concentration (3.3 µg·L⁻¹) are addressed. Membrane technology is promising to make this happen by simultaneous U( ... ...

Abstract	The ocean reserves nearly four billion tons of uranium, providing an inexhaustible supply of nuclear energy if the limits of ultralow U(VI) concentration (3.3 µg·L⁻¹) are addressed. Membrane technology is promising to make this happen by simultaneous U(VI) concentration and extraction. Herein, we report a pioneering adsorption-pervaporation membrane for efficient enrichment and capture of U(VI) along with clean water production. A bifunctional poly(dopamine–ethylenediamine) and graphene oxide 2D scaffold membrane was developed and further crosslinked by glutaraldehyde, capable of recovering over 70% U(VI) and water from simulated seawater brine, which validates the feasibility of one-step water recovery, brine concentration, and uranium extraction from seawater brine. Moreover, compared with other membranes and adsorbents, this membrane exhibits fast pervaporation desalination (flux: 153.3 kg·m⁻²·h⁻¹, rejection: >99.99%) and excellent uranium capture properties of 228.6 mg·m⁻² benefiting from plentiful functional groups provided by embedded poly(dopamine–ethylenediamine). This study aims to provide a strategy for recovering critical elements from the ocean.
Keywords	adsorbents ; crosslinking ; desalination ; glutaraldehyde ; graphene oxide ; nuclear power ; pervaporation ; seawater ; uranium ; Adsorption ; Seawater brine
Language	English
Dates of publication	2023-09
Size	p. 131822
Publishing place	Elsevier B.V.
Document type	Article ; Online
ZDB-ID	1491302-1
ISSN	1873-3336 ; 0304-3894
ISSN (online)	1873-3336
ISSN	0304-3894
DOI	10.1016/j.jhazmat.2023.131822
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: One-step uranium extraction and brine desalination via adsorptive pervaporation by graphene-oxide scaffold membranes.

Wang, Guangcheng / Shi, Gui Min / Zhang, Sui

Journal of hazardous materials

2023 Volume 457, Page(s) 131822

Abstract: The ocean reserves nearly four billion tons of uranium, providing an inexhaustible supply of nuclear energy if the limits of ultralow U(VI) concentration (3.3 µg· ... ...

Abstract	The ocean reserves nearly four billion tons of uranium, providing an inexhaustible supply of nuclear energy if the limits of ultralow U(VI) concentration (3.3 µg·L
Language	English
Publishing date	2023-06-09
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	1491302-1
ISSN	1873-3336 ; 0304-3894
ISSN (online)	1873-3336
ISSN	0304-3894
DOI	10.1016/j.jhazmat.2023.131822
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Article ; Online: Machine Learning-Assisted Design of Thin-Film Composite Membranes for Solvent Recovery.

Wang, Mao / Shi, Gui Min / Zhao, Daohui / Liu, Xinyi / Jiang, Jianwen

Environmental science & technology

2023 Volume 57, Issue 42, Page(s) 15914–15924

Abstract: Organic solvents are extensively utilized in industries as raw materials, reaction media, and cleaning agents. It is crucial to efficiently recover solvents for environmental protection and sustainable manufacturing. Recently, organic solvent ... ...

Abstract	Organic solvents are extensively utilized in industries as raw materials, reaction media, and cleaning agents. It is crucial to efficiently recover solvents for environmental protection and sustainable manufacturing. Recently, organic solvent nanofiltration (OSN) has emerged as an energy-efficient membrane technology for solvent recovery; however, current OSN membranes are largely fabricated by trial-and-error methods. In this study, for the first time, we develop a machine learning (ML) approach to design new thin-film composite membranes for solvent recovery. The monomers used in interfacial polymerization, along with membrane, solvent and solute properties, are featurized to train ML models via gradient boosting regression. The ML models demonstrate high accuracy in predicting OSN performance including solvent permeance and solute rejection. Subsequently, 167 new membranes are designed from 40 monomers and their OSN performance is predicted by the ML models for common solvents (methanol, acetone, dimethylformamide, and
MeSH term(s)	Solvents ; Methanol ; Acetone ; Commerce ; Machine Learning
Chemical Substances	Solvents ; Methanol (Y4S76JWI15) ; Acetone (1364PS73AF)
Language	English
Publishing date	2023-10-10
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ISSN	1520-5851
ISSN (online)	1520-5851
DOI	10.1021/acs.est.3c04773
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Separation of vegetable oil compounds and solvent recovery using commercial organic solvent nanofiltration membranes

Shi, Gui Min / Chung, Tai-Shung / Davood Abadi Farahani, Mohammad Hossein / Liu, Jia Yu

Journal of membrane science. 2019 Oct. 15, v. 588

2019

Abstract: Solvent recovery and separation of oil compounds by means of thermal evaporation processes consume a huge amount of energy. Organic solvent nanofiltration (OSN) is an energy-efficient separation technique that can be potentially used for solvent recovery ...

Abstract	Solvent recovery and separation of oil compounds by means of thermal evaporation processes consume a huge amount of energy. Organic solvent nanofiltration (OSN) is an energy-efficient separation technique that can be potentially used for solvent recovery and separation of oil compounds in the vegetable oil industry. However, there are only a few studies on the separation of oil compounds using OSN. Almost no studies have been conducted on membrane fouling and long-term stability using highly concentrated oil/solvent feeds. This study explores the separation of oil compounds such as triglycerides and free fatty acids as well as solvent recovery using a series of Evonik commercial membranes. Under a static testing condition, the permeance of Duramem 500 reduces severely from 1.02 to 0.06 LMH/bar with an increase in oil concentration while its rejection to glyceryl trilinoleate decreases slightly from 86 to 84.8% when the feed concentration increases from 5 to 50 wt%. The severe permeance decline arises from the high viscosity of the permeate and oil layers accumulated on the membrane surface. In contrast, the membrane is able to separate glyceryl trilinoleate from linoleic acid with permeances approximately 3–6 times of those obtained from the static testing mode under 1-week cross-flow tests using a 20 wt% oil/acetone feed.
Keywords	acetone ; artificial membranes ; energy efficiency ; evaporation ; fats and oils industry ; feeds ; fouling ; free fatty acids ; linoleic acid ; nanofiltration ; solvents ; static testing ; triacylglycerols ; vegetable oil ; viscosity
Language	English
Dates of publication	2019-1015
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	194516-6
ISSN	0376-7388
ISSN	0376-7388
DOI	10.1016/j.memsci.2019.117202
Database	NAL-Catalogue (AGRICOLA)

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Article: Two-membrane air fresheners for continuous non-energized perfume delivery

Shi, Gui Min / Bee Ting Low / Kelly Anderson / Tai Shung Chung

Journal of membrane science. 2019 July 01, v. 581

2019

Abstract: We have developed two-membrane air fresheners for continuous non-energized air freshener perfume delivery with significantly superior delivery consistency over a conventional membrane air freshener. In this study, a model perfume is used to investigate ... ...

Abstract	We have developed two-membrane air fresheners for continuous non-energized air freshener perfume delivery with significantly superior delivery consistency over a conventional membrane air freshener. In this study, a model perfume is used to investigate the conventional air freshener as functions of temperature and air velocity. The release rate of the conventional air freshener varies greatly from its initial use to its end-of-life under a fixed ambient condition. In order to regulate the evaporation rates of the volatile compounds, the new air freshener consisting of an inner membrane and an outer membrane. The outer membrane is used as the regulation membrane to create a vapor reservoir between the inner wet membrane and the outer membrane so that the vapor generated from the inner membrane can be regulated. Comparing the conventional air freshener to the new air freshener, the outer membrane impregnated with polyethylene glycol (PEG) shows significantly better consistency of perfume delivery rates under different air velocities and temperatures. In addition, a model has been employed to predict the perfume release from the conventional air freshener. The perfume release from the newly developed air fresheners is regulated by vapor transport through the outer membrane which may be predicted through the Knudsen flow or solution diffusion model.
Keywords	air ; artificial membranes ; models ; perfumes ; polyethylene glycol ; temperature ; vapors ; volatile compounds
Language	English
Dates of publication	2019-0701
Size	p. 114-122.
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	194516-6
ISSN	0376-7388
ISSN	0376-7388
DOI	10.1016/j.memsci.2019.03.032
Database	NAL-Catalogue (AGRICOLA)

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Article: Membranes for Continuous Nonenergized Air Freshener Perfume Delivery

Shi, Gui Min / Kelly Anderson / Lin Hao / Tai Shung Chung

Industrial & engineering chemistry process design and development. 2017 Nov. 22, v. 56, no. 46

2017

Abstract: Membrane-based liquid air fresheners are attracting significant market interest because of their small size and ability to allow continuous delivery of perfume compounds without the need of external energy sources. However, the air freshener membranes ... ...

Abstract	Membrane-based liquid air fresheners are attracting significant market interest because of their small size and ability to allow continuous delivery of perfume compounds without the need of external energy sources. However, the air freshener membranes that enable the nonenergized delivery are rarely reported in the literature except in patents. For the first time, we investigated a commercial air freshener membrane systematically to provide thorough characterizations of the membrane materials, morphology, and pore information. The interaction between a model perfume containing four compounds and the membrane was also studied through liquid wetting and contact angle measurements. Long-term tests to track the air freshener revealed that the perfume release rate was dependent on the perfume reservoir composition in a controlled external environment. Lastly, perfume transport through the membrane was investigated for the correlation of membrane properties and liquid flux through the membrane. This pioneering study may provide essential information for future improvement over the existing air freshener membranes to enable continuous perfume delivery without an energy provision.
Keywords	air ; contact angle ; energy ; liquids ; markets ; models ; patents ; perfumes ; process design
Language	English
Dates of publication	2017-1122
Size	p. 13791-13799.
Publishing place	American Chemical Society
Document type	Article
ZDB-ID	1484436-9
ISSN	1520-5045 ; 0888-5885
ISSN (online)	1520-5045
ISSN	0888-5885
DOI	10.1021/acs.iecr.7b04134
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: The development of novel Nexar block copolymer/Ultem composite membranes for C2-C4 alcohols dehydration via pervaporation.

Zuo, Jian / Shi, Gui Min / Wei, Shawn / Chung, Tai-Shung

ACS applied materials & interfaces

2014 Volume 6, Issue 16, Page(s) 13874–13883

Abstract: Novel composite membranes comprising sulfonated styrenic Nexar pentablock copolymers were developed by dip-coating on poly(ether imide) hollow fibers for pervaporation dehydration of C2-C4 alcohols. The advantages of using block copolymers as the ... ...

Abstract	Novel composite membranes comprising sulfonated styrenic Nexar pentablock copolymers were developed by dip-coating on poly(ether imide) hollow fibers for pervaporation dehydration of C2-C4 alcohols. The advantages of using block copolymers as the selective layer are (1) their effectiveness to synergize the physicochemical properties of different chemical and structural moieties and (2) tunable nanoscale morphology and nanostructure via molecular engineering. To achieve high-performance composite membranes, the effects of coating time, ion exchange capacity (IEC) of the copolymer, and solvent systems for coating were investigated. It is revealed that a minimum coating time of 30 s is needed for the formation of a continuous and less-defective top layer. A higher IEC value results in a membrane with a higher flux and lower separation factor because of enhanced hydrophilicity and stretched chain conformation. Moreover, the composite membranes prepared from hexane/ethanol mixtures show higher separation factors and lower fluxes than those from the hexane solvent owing to microdomain segregation induced by ethanol and a smooth and dense top selective layer. These hypotheses were verified by atomic force microscopy and positron annihilation spectroscopy. The newly developed composite membranes demonstrate impressive separation performance with fluxes exceeding 2 kg/m(2) h and separation factors more than 200 for isopropyl alcohol and n-butanol dehydration from 85/15 wt % alcohol/water feed mixtures at 50 °C.
Language	English
Publishing date	2014-08-27
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ISSN	1944-8252
ISSN (online)	1944-8252
DOI	10.1021/am503277t
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: The Development of Novel Nexar Block Copolymer/Ultem Composite Membranes for C2âC4 Alcohols Dehydration via Pervaporation

Zuo, Jian / Chung Tai-Shung / Shi Gui Min / Wei Shawn

ACS Applied Materials & Interfaces. 2014 Aug. 27, v. 6, no. 16

2014

Abstract: Novel composite membranes comprising sulfonated styrenic Nexar pentablock copolymers were developed by dip-coating on poly(ether imide) hollow fibers for pervaporation dehydration of C2âC4 alcohols. The advantages of using block copolymers as the ... ...

Abstract	Novel composite membranes comprising sulfonated styrenic Nexar pentablock copolymers were developed by dip-coating on poly(ether imide) hollow fibers for pervaporation dehydration of C2âC4 alcohols. The advantages of using block copolymers as the selective layer are (1) their effectiveness to synergize the physicochemical properties of different chemical and structural moieties and (2) tunable nanoscale morphology and nanostructure via molecular engineering. To achieve high-performance composite membranes, the effects of coating time, ion exchange capacity (IEC) of the copolymer, and solvent systems for coating were investigated. It is revealed that a minimum coating time of 30 s is needed for the formation of a continuous and less-defective top layer. A higher IEC value results in a membrane with a higher flux and lower separation factor because of enhanced hydrophilicity and stretched chain conformation. Moreover, the composite membranes prepared from hexane/ethanol mixtures show higher separation factors and lower fluxes than those from the hexane solvent owing to microdomain segregation induced by ethanol and a smooth and dense top selective layer. These hypotheses were verified by atomic force microscopy and positron annihilation spectroscopy. The newly developed composite membranes demonstrate impressive separation performance with fluxes exceeding 2 kg/mÂ² h and separation factors more than 200 for isopropyl alcohol and n-butanol dehydration from 85/15 wt % alcohol/water feed mixtures at 50 Â°C.
Keywords	asymmetric membranes ; atomic force microscopy ; butanol ; coatings ; composite polymers ; electrons ; engineering ; ethanol ; hexane ; hydrophilicity ; ion exchange ; isopropyl alcohol ; nanomaterials ; pervaporation ; solvents ; spectroscopy
Language	English
Dates of publication	2014-0827
Size	p. 13874-13883.
Publishing place	American Chemical Society
Document type	Article
ISSN	1944-8252
DOI	10.1021%2Fam503277t
Database	NAL-Catalogue (AGRICOLA)

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Article: Sorption, swelling, and free volume of polybenzimidazole (PBI) and PBI/zeolitic imidazolate framework (ZIF-8) nano-composite membranes for pervaporation

Shi, Gui Min / Chen, Hongmin / Jean, Y.C / Chung, Tai Shung

Polymer. 2013 Jan. 24, v. 54, no. 2

2013

Abstract: We have studied alcohol- and water-induced swelling and sorption of PBI and PBI/ZIF-8 nano-composite membranes and characterized both dry and wet membranes by positron annihilation lifetime spectroscopy (PALS). The degrees of membrane swelling after ... ...

Abstract	We have studied alcohol- and water-induced swelling and sorption of PBI and PBI/ZIF-8 nano-composite membranes and characterized both dry and wet membranes by positron annihilation lifetime spectroscopy (PALS). The degrees of membrane swelling after immersing in alcohols and water follow the order of ethanol > methanol > water > n-butanol. Addition of ZIF-8 particles into PBI membranes suppresses the ethanol-, methanol- and water-induced PBI swelling. The water-induced swelling is subdued most severely because of the hydrophobic nature and rigid structure of ZIF-8 particles, while the n-butanol-induced swelling is enhanced owing to a greater free volume in the PBI/ZIF-8 membrane. The PALS studies confirm that the high pervaporation permeability of PBI/ZIF-8 membranes is attributed to the high fractional free volume (FFV) created by large cavities of ZIF-8 particles. In addition, the alcohol saturated PBI/ZIF-8 membranes have significantly smaller free volume radii than alcohol saturated PBI membranes. A correlation among FFV, pervaporation permeability and sorption diffusion coefficient has been developed. This study also demonstrates the importance of using PALS to characterize membrane structure changes in solvent-saturated membranes at a molecular level and to correlate pervaporation performance with solvent-induced swelling.
Keywords	diffusivity ; ethanol ; hydrophobicity ; methanol ; permeability ; pervaporation ; polymers ; sorption ; spectroscopy
Language	English
Dates of publication	2013-0124
Size	p. 774-783.
Publishing place	Elsevier Ltd
Document type	Article
ISSN	0032-3861
DOI	10.1016/j.polymer.2012.11.056
Database	NAL-Catalogue (AGRICOLA)

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Article: Thin film composite membranes on ceramic for pervaporation dehydration of isopropanol

Shi, Gui Min / Chung, Tai-Shung

Journal of membrane science

Volume v. 448

Abstract: We have developed novel thin film composite (TFC) membranes on ceramic substrates (referred as ceramic TFC membranes thereafter) for pervaporation dehydration of isopropanol (IPA) by using interfacial polymerization (IP) of m-phenylenediamine (MPD) and ... ...

Abstract	We have developed novel thin film composite (TFC) membranes on ceramic substrates (referred as ceramic TFC membranes thereafter) for pervaporation dehydration of isopropanol (IPA) by using interfacial polymerization (IP) of m-phenylenediamine (MPD) and trymesoylchoride (TMC) to create ultra-thin polyamide films as selective layers. Prior to IP, a gutter layer of polydopamine (PDA) or polyethyleneimine (PEI) was deposited on α-alumina ceramic surfaces to improve the adhesion of polyamide thin films onto the ceramic. It was found that the PEI-coated ceramic substrate provided better adhesion with the polyamide thin film than the original and PDA-coated ones owing to its smoother surface. Polydimethylsiloxane (PDMS) was employed to seal defects on ceramic TFC membranes and significantly improved the performance of pervaporation dehydration of IPA with a flux of 6.05kg/m²h and a separation factor 1396 at 80°C. Moreover, the developed ceramic TFC membrane shows high stability after 120h operation. Positron annihilation spectroscopy (PAS) analyses revealed that the newly developed membrane has an ultrathin polyamide layer of 79nm and a PDMS coating of ~26nm. This study demonstrates the promising application of ceramic TFC membranes for pervaporation dehydration of organic solutions.
Keywords	polyamides ; ceramics ; adhesion ; polymerization ; coatings ; pervaporation ; spectroscopy ; isopropyl alcohol ; artificial membranes
Language	English
Document type	Article
ISSN	0376-7388
Database	AGRIS - International Information System for the Agricultural Sciences and Technology

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