Effect of ZIF-71 ligand-exchange surface modification on biofuel recovery through pervaporation

Yin, Huidan; Cay-Durgun, Pinar; Lai, Tianmiao; Zhu, Guanghui; Engebretson, Kiah; Setiadji, Regina; Green, Matthew D.; Lind, Mary Laura

doi:10.1016/j.polymer.2020.122379

Cited by 23 publications

(10 citation statements)

References 37 publications

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“…And both the WCA and LEP have obvious improvement from 94.5° and 168 kPa to 134° and 220 kPa, respectively. As described previously [41–43], ZIF-71 has a superhydrophobic framework in nature. The improvement of membrane surface hydrophobicity after the addition of ZIF-71 is mainly due to the emergence of these superhydrophobic ZIF-71 crystals on PVDF membrane surface.…”

Section: Resultsmentioning

confidence: 81%

“…As a subclass of MOFs, zeolitic imidazolate frameworks (ZIFs) having porous structure, excellent thermal and chemical stabilities as well as wide topological variety have been promising additives for the modification of separation membranes to obtain high-performance mixed matrix membranes (MMMs). Over the wide topological variety of ZIFs, ZIF-8 and ZIF-71 are the most commonly used functional additives for MMMs due to their excellent hydrophobicity and vapor adsorption capacity [41,42]. In contrast, ZIF-71 has more super-hydrophobic pore channels and larger cages.…”

Section: Introductionmentioning

confidence: 99%

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Removal of high concentration Congo red by hydrophobic PVDF hollow fiber composite membrane coated with a loose and porous ZIF-71PVDF layer through vacuum membrane distillation

Shi

et al. 2020

Journal of Industrial Textiles

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Although membrane distillation (MD) technology has the outstanding advantages of almost 100% solute retention and mild operation conditions, its further development is limited by low permeate flux. In order to solve the problem, the improvement of membrane hydrophobicity becomes one of the effective solutions. In this study, a loose and porous hydrophobic zeolitic imidazolate frameworks-71 (ZIF-71)/polyvinylidene fluoride (PVDF) coating layer was composited on the outside surface of PVDF hollow fiber support membrane by the dilute solution coating to enhance membrane hydrophobicity. The prepared hollow fiber composite (HFC) membranes were employed to remove high concentration Congo red (CR) through VMD. The effects of different operation conditions including the dye concentration, feed temperature, vacuum pressure and feed flow rate on CR rejection and permeate water flux were investigated. In the variation range of operating conditions, all the CR rejection of the PVDF HFC membranes shows a slight change and remains above 99.9%. Under the optimal operation conditions including dye concentration 600 mg·L−1, vacuum pressure 31.325 kPa, feed temperature 60°C and feed flow rate 50 L·h−1, HFC membrane exhibit a permeate water flux of 13.15 kg·m−2·h−1. HFC membrane suffers dye fouling during the continuous dye filtration for 100 h. The fouling mechanism was proposed and a combined cleaning way including forward washing, back flushing and chemical desorption has been proved to be effective in recovering membrane water flux.

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Section: Resultsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Removal of high concentration Congo red by hydrophobic PVDF hollow fiber composite membrane coated with a loose and porous ZIF-71PVDF layer through vacuum membrane distillation

Shi

et al. 2020

Journal of Industrial Textiles

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“…Although it is known that PDMS is benchmark material in the preparation of ethanol perm-selective membranes, pure PDMS membranes show low fluxes and little ethanol selectivity. However, by modifying the composition of the PDMS membrane (mixed-matrix membranes (MMMs) or hybrid membranes) it is possible to improve the ethanol separation efficiency, increasing both permeability and selectivity [ 59 , 62 , 63 , 64 ].…”

Section: Resultsmentioning

confidence: 99%

Separation and Semi-Empiric Modeling of Ethanol–Water Solutions by Pervaporation Using PDMS Membrane

et al. 2020

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High energy demand, competitive fuel prices and the need for environmentally friendly processes have led to the constant development of the alcohol industry. Pervaporation is seen as a separation process, with low energy consumption, which has a high potential for application in the fermentation and dehydration of ethanol. This work presents the experimental ethanol recovery by pervaporation and the semi-empirical model of partial fluxes. Total permeate fluxes between 15.6–68.6 mol m−2 h−1 (289–1565 g m−2 h−1), separation factor between 3.4–6.4 and ethanol molar fraction between 16–171 mM (4–35 wt%) were obtained using ethanol feed concentrations between 4–37 mM (1–9 wt%), temperature between 34–50 ∘C and commercial polydimethylsiloxane (PDMS) membrane. From the experimental data a semi-empirical model describing the behavior of partial-permeate fluxes was developed considering the effect of both the temperature and the composition of the feed, and the behavior of the apparent activation energy. Therefore, the model obtained shows a modified Arrhenius-type behavior that calculates with high precision the partial-permeate fluxes. Furthermore, the versatility of the model was demonstrated in process such as ethanol recovery and both ethanol and butanol dehydration.

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“…A solvent assisted ligand exchange method was used to modify the ZIF-71 particles, using four different ligands-benzimidazole (BIM), methylbenzimidazole (MBIM), DMBIM and polyimide (PI). Membranes prepared by Yin et al [39] using these ZIF-71 particles as fillers showed better selectivity but poor permeability for alcohol separation from aqueous solutions, as compared to unmodified filler particles. This was mainly because the modified particles had smaller pore sizes due to the larger sizes of these ligands as compared to the original dichloroimidazolate (dclm) ligand.…”

Section: Modified Zif Particlesmentioning

confidence: 99%

A Review on Mixed Matrix Membranes for Solvent Dehydration and Recovery Process

2021

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Solvent separation and dehydration are important operations for industries and laboratories. Processes such as distillation and extraction are not always effective and are energy-consuming. An alternate approach is offered by pervaporation, based on the solution-diffusion transport mechanism. Polymer-based membranes such as those made of Polydimethylsiloxane (PDMS) have offered good pervaporation performance. Attempts have been made to improve their performance by incorporating inorganic fillers into the PDMS matrix, in which metal-organic frameworks (MOFs) have proven to be the most efficient. Among the MOFs, Zeolitic imidazolate framework (ZIF) based membranes have shown an excellent performance, with high values for flux and separation factors. Various studies have been conducted, employing ZIF-PDMS membranes for pervaporation separation of mixtures such as aqueous-alcoholic solutions. This paper presents an extensive review of the pervaporation performance of ZIF-based mixed matrix membranes (MMMs), novel synthesis methods, filler modifications, factors affecting membrane performance as well as studies based on polymers other than PDMS for the membrane matrix. Some suggestions for future studies have also been provided, such as the use of biopolymers and self-healing membranes.

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Effect of ZIF-71 ligand-exchange surface modification on biofuel recovery through pervaporation

Cited by 23 publications

References 37 publications

Removal of high concentration Congo red by hydrophobic PVDF hollow fiber composite membrane coated with a loose and porous ZIF-71PVDF layer through vacuum membrane distillation

Removal of high concentration Congo red by hydrophobic PVDF hollow fiber composite membrane coated with a loose and porous ZIF-71PVDF layer through vacuum membrane distillation

Separation and Semi-Empiric Modeling of Ethanol–Water Solutions by Pervaporation Using PDMS Membrane

A Review on Mixed Matrix Membranes for Solvent Dehydration and Recovery Process

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