A fluorinated, defect-free ZIF-8/PDMS mixed matrix membrane for enhancing ethanol pervaporation

Pang, Siyu; Si, Zhihao; Li, Guozhen; Wu, Hanzhu; Cui, Yuhui; Zhang, Changwei; Ren, Cong; Yang, Shuai; Pang, Shusheng; Qin, Peiyong

doi:10.1016/j.memsci.2022.120920

Cited by 21 publications

(7 citation statements)

References 89 publications

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“…The Hildebrand solubility parameters for methanol, ethanol, isopropanol, and 1-butanol are 29.6, 26.2, 23.6, and 23.3 MPa 0.5 , respectively. ,, 1-Butanol exhibits relatively closer compatibility with PDMS (14.9 MPa 0.5 ), leading to a stronger affinity for PDMS . Second, the molecular dynamics radius of methanol, ethanol, isopropanol, and 1-butanol are 0.195, 0.225, 0.235, and 0.25 nm, respectively. ,,− The molecular kinetic radius gradually approaches the r 3 of ME-PDMS. Once bulkier molecules diffuse through the network cavity, the water endures a greater transport resistance coupled with the high hydrophobicity of the ME-PDMS membrane itself, leading to a decrease in water flux and an increase in alcohol flux.…”

Section: Resultsmentioning

confidence: 98%

Photopolymerized Fabrication Method for PDMS Pervaporative Membranes

Li,

Yang,

Zhan

et al. 2023

Ind. Eng. Chem. Res.

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The polydimethylsiloxane (PDMS) membrane can be considered the benchmark of alcohol-selective membranes, and its preparation method by photopolymerization shows a great potential on the industrial scale. However, a single photopolymerization system by a free radical or cation is still a challenge to simultaneously have a high reaction speed and oxygen insensitivity. In this work, we proposed a free radical/cationic hybrid membrane-forming system toward PDMS. Both methacrylate groups and epoxy groups were introduced into the PDMS chain by the covalent bonding of 3-methacryloxypropylmethyldimethoxysilane and 3-glycidyloxypropyl(dimethoxy)methylsilane with PDMS. This hybrid system can be quickly cured by a free radical reaction which weakens the oxygen inhibition by a cationic reaction. Furthermore, the transport structure of membranes is effectively controlled by the difference in the reactivity between methacrylate and epoxy groups, where the formed molecular weight and viscosity of the prepolymer are changed from 62,860 to 108,198 g mol −1 and 1.53 to 2.26 Pa s, respectively, and the free volume of membranes is tuned from 5.567 to 6.253%. By optimization, the pervaporation performance of the membrane includes a 1-butanol separation factor of 37.9 and a total flux of 1179 g m −2 h −1 as evaluating 1.5 wt % 1-butanol/water solutions at 55 °C, which has a high superiority coupled with the fast reaction speed and oxygen insensitivity.

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Section: Resultsmentioning

confidence: 98%

Photopolymerized Fabrication Method for PDMS Pervaporative Membranes

Li,

Yang,

Zhan

et al. 2023

Ind. Eng. Chem. Res.

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“…20,[24][25][26] In this regard, polymeric membranes, such as poly(dimethyl siloxane) (PDMS), were considered due to their high hydrophobicity, high thermal resistance, and being cheaper and more economical than mineral membranes. 27,28 Ghoreyshi et al 24 studied the incorporation of a membrane-based pervaporation process into a membrane bioreactor (MBR) with batch fermentation to improve bioethanol production from glucose solution in comparison to conventional batch fermentation performed under optimal conditions. It is widely acknowledged that the efficiency of pervaporation is significantly impacted by the conditions under which the process takes place.…”

Section: Introductionmentioning

confidence: 99%

Ethanol production from sugarcane bagasse by modified PDMS membrane in a membrane bioreactor: pervaporation technique

Zabihi,

Esfahanian

2024

J of Chemical Tech & Biotech

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BACKGROUNDBioethanol is considered a highly promising alternative to fossil fuels due to its derivation from renewable sources. Reducing the disadvantages of conventional fermentation requires removing the product from the fermentation broth after its formation. Therefore, coupling the membrane separation with a biological process in a single unit leads a reduction of substrate and product inhibitions.RESULTSIn this work, bioethanol production was investigated in a membrane bioreactor (MBR) with sugarcane bagasse (lignocellulose waste) as a renewable source by the sulfuric acid hydrolysis process. Firstly, the optimum conditions to produce the maximum amount of sugar by acid hydrolysis were determined. Second, the membrane bioreactor and pervaporation unit equipped with poly(dimethyl siloxane) carbon nanotube/Tetrazole membrane (PDMS‐CNT/Tetrazole) was fabricated. Third, bioethanol production in a conventional batch reactor (CBR) and the novel MBR was implemented. The outcomes of the two kinds of reactors were then compared. The results illustrated that the optimum conditions for acid hydrolysis are at a temperature of 199.4 °C, an operation time of 30.77 min, and an acid concentration of 1.12%. The obtained data shows that the ethanol production in MBR was increased by 103.6% over conventional fermentation. Furthermore, the pervaporated ethanol concentration was higher than that of the broth because of the high membrane selectivity, where a maximum ethanol concentration of 165.7 g L−1 in the cold trap was achieved.CONCLUSIONFinally, the results illustrate that the MBR can decrease the cell density growth rate and dominate any substrate and product inhibitions, while keeping process productivity for ethanol quite high. © 2024 Society of Chemical Industry (SCI).

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“…To address this issue, the in situ removal of bioethanol from fermentation broth has been proposed as an effective strategy to improve the fermentation system's productivity 7 . Among various separation techniques, pervaporation (PV) has gained significant attention due to its low energy consumption, high efficiency, and harmlessness to microorganisms 8–15 . In industrial applications, hollow fiber membrane modules have become one of the most important types of membrane modules.…”

Section: Introductionmentioning

confidence: 99%

“…7 Among various separation techniques, pervaporation (PV) has gained significant attention due to its low energy consumption, high efficiency, and harmlessness to microorganisms. [8][9][10][11][12][13][14][15] In industrial applications, hollow fiber membrane modules have become one of the most important types of membrane modules. They have the advantages such as high packing density, large effective area, and good selfsupporting properties.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of highly permeable PDMS@ZIF‐8/PVDF hollow fiber composite membrane in module for ethanol‐water separation

et al. 2023

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The construction of high‐performance MOF‐based hollow fiber composite membrane (HFCM) modules is a significant, yet challenging task for the biofuel production industry. In this study, a novel approach was taken to fabricate PDMS@ZIF‐8/PVDF HFCMs in modules through a facile ZIF‐8 self‐crystallization synthesis followed by pressure‐assisted PDMS infusion for pervaporation ethanol‐water separation. The as‐prepared HFCMs exhibited an ultrathin separation layer (thickness, 370 ± 35 nm), which was achieved through precise regulation of the ZIF‐8 membrane and defect repair by PDMS infusion. Moreover, the strategy utilized in this study resolved the defect issues arising from MOF agglomeration in conventional composite membranes. Impressively, at the optimal packing density, the prepared membrane demonstrated a remarkable ethanol flux (1.11 kg m−2 h−1) with an PSI value (26.59 kg m−2 h−1) and showed promising long‐term stability for the pervaporation of 5 wt% ethanol aqueous solution at 40°C.

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A fluorinated, defect-free ZIF-8/PDMS mixed matrix membrane for enhancing ethanol pervaporation

Cited by 21 publications

References 89 publications

Photopolymerized Fabrication Method for PDMS Pervaporative Membranes

Photopolymerized Fabrication Method for PDMS Pervaporative Membranes

Ethanol production from sugarcane bagasse by modified PDMS membrane in a membrane bioreactor: pervaporation technique

Fabrication of highly permeable PDMS@ZIF‐8/PVDF hollow fiber composite membrane in module for ethanol‐water separation

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