Mixed matrix membranes with molecular-interaction-driven tunable free volumes for efficient bio-fuel recovery

Liu, Gongping; Hung, Wei‐Song; Shen, Jie; Li, Qianqian; Huang, Yun-Hsuan; Jin, Wanqin; Lee, Kueir‐Rarn; Lai, Juin‐Yih

doi:10.1039/c4ta05881j

Cited by 113 publications

(53 citation statements)

References 71 publications

(71 reference statements)

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“…A better method of reporting the pervaporation data is the membrane permeability and permeance. Comparing the membrane developed in this study with PDMS‐PS and PDMS‐POSS membranes, the nanocomposite membranes tested in this investigation had a 460% and 236% higher separation factor, respectively, as well as higher permeability. As can be noted in Table , PDMS‐CNTs membrane has a higher flux and separation factor than the 6% AC‐PDMS membrane.…”

Section: Resultsmentioning

confidence: 87%

Effect of embedded activated carbon nanoparticles on the performance of polydimethylsiloxane (PDMS) membrane for pervaporation separation of butanol

Azimi

Tezel

Thibault

2017

J. Chem. Technol. Biotechnol

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BACKGROUND: The pervaporation separation method is considered to be a promising technique for biobutanol recovery from fermentation broths. In this work, activated carbon nanoparticles were embedded in polydimethylsiloxane (PDMS) membranes to improve the pervaporation performance. RESULTS: Adding 6 wt% nano-additives in PDMS membranes increased the flux and separation factor by 42.6% and 51.9%, respectively, compared with neat membranes at 37 ∘ C. Enhanced performance is due to: 1 the presence of additional sorption sites within the membrane with a high affinity for butanol; and 2 the porous structure of the nanofillers generate new pathways for facilitated mass transport through the membrane. The effect of the operating temperature and particle concentration on membrane performance was investigated. Membrane performance improved with an increase in the operating temperature. Higher temperature resulted in increased free volume in the PDMS chains leading to higher diffusion of butanol. Mechanical tensile tests showed that nanocomposite membranes have better mechanical stability in comparison with neat PDMS membranes with the best performance observed at 6 wt% of the nano-additives. CONCLUSION:The presence of activated carbon nanoparticles in the matrix of PDMS membranes leading to higher flux and separation factor can be beneficial for pervaporation separation of butanol from fermentation broths.

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Section: Resultsmentioning

confidence: 87%

Effect of embedded activated carbon nanoparticles on the performance of polydimethylsiloxane (PDMS) membrane for pervaporation separation of butanol

Azimi

Tezel

Thibault

2017

J. Chem. Technol. Biotechnol

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“…The solvent was evaporated at room temperature for 1 day, then dried in a vacuum oven for 24 h and the MXene nanofilms were finally formed. PDMS was also used to better understand the effect of spin‐coated polymer, whose preparation method was reported by a previous works . PDMS polymer was dissolved in n ‐heptane uniformly with the concentration of 3 wt%.…”

Section: Methodsmentioning

confidence: 99%

2D MXene Nanofilms with Tunable Gas Transport Channels

Shen

Liu

et al. 2018

Adv Funct Materials

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349

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2D materials' membranes with well-defined nanochannels are promising for precise molecular separation. Herein, the design and engineering of atomically thin 2D MXene flacks into nanofilms with a thickness of 20 nm for gas separation are reported. Well-stacked pristine MXene nanofilms are proven to show outstanding molecular sieving property for H 2 preferential transport. Chemical tuning of the MXene nanochannels is also rationally designed for selective permeating CO 2 . Borate and polyethylenimine (PEI) molecules are well interlocked into MXene layers, realizing the delicate regulation of stacking behaviors and interlayer spacing of MXene nanosheets. The MXene nanofilms with either H 2 -or CO 2 -selective transport channels exhibit excellent gas separation performance beyond the limits for state-of-the-art membranes. The mechanisms within these nanoconfined MXene layers are discussed, revealing the transformation from "diffusion-controlled" to "solution-controlled" channels after chemical tuning. This work of precisely tailoring the 2D nanostructure may inspire the exploring of nanofluidics in 2D confined space with applications in many other fields like catalysis and energy conversion processes.fabrication. Hence, MXene is considered to be a novel potential candidate for developing separative 2D-material membranes. However, there are a very few reports on MXene separation membranes. Gogotsi and co-workers first reported MXene membranes for rejection of trivalent cation in solution using nonpressure diffusion. [12] A high water permeance was obtained by applying MXene stacks in the pressure-filtration process, [13] but the membrane can only rejected matters with a size larger than 2.5 nm. Very recently, Wang and co-workers [14] reported the manufacturing of MXene membranes with highly ordered nanochannel structures for high-performance separation of H 2 /CO 2 , which opens the door of applying MXene membranes for molecular separation. It is considered that rationally regulating the nanostructure of 2D channels may, thereby, enlighten the exploring of MXene materials for sub-nanoscale separation with versatile functionalities.Herein, we report the design and engineering of MXene nanofilms with tunable transport channels for gas separation. Ultrathin pristine MXene nanofilms with a thickness down to 20 nm were fabricated by horizontally aligning the exfoliated MXene nanosheets on porous substrates. Molecular sieving channels within pristine MXene nanofilm can be formed to show highly selective H 2 permeation, as shown in Figure 1. Interestingly, these MXene laminates, as functionalized by borate and amine, exhibit different stacking behaviors and tunable interlayer spacing, allowing preferential CO 2 permeation. The resulting separation performance of either H 2 -or CO 2selective MXene nanofilms is beyond the performance limits for state-of-the-art membranes.

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“…Thep erformance improvement in the UV-polymerized MMM can also be understood from the free volume variation of polymer and pore structure of silicalite-1. [27] Thef ree volume is the finely tuned result of r 3 (smaller pore from the cross-linked site) and r 4 (larger pore from networks clusters as well as the polymer-filler interface) [28] as shown in Figure 3b and in Table S7 in the Supporting Information. r 3 increases as the silicalite-1 amount increases,b ecause the well-dispersed silicalite-1 effectively disrupts the MA-PDMS chain packing.…”

mentioning

confidence: 99%

“…[29] Meanwhile, r 4 increases because the weak interaction between silicalite-1 and MA-PDMS causes al oose chain packing and an increased chain mobility in the interface (Supporting Information, Table S8). [27,30] Simultaneous increases in r 3 and r 4 allow the feed molecules to easily pass through the free volume cavities and further facilitate an enhanced permeability.T he increase in I 3 and decrease in I 4 imply the partial pore blockage of silicalite-1 by polymer chains, [31] hence leading to the decrease of free volume. Furthermore,t he water transport is influenced by the interactions between water and the channel surface.…”

mentioning

confidence: 99%

The Ultrafast and Continuous Fabrication of a Polydimethylsiloxane Membrane by Ultraviolet‐Induced Polymerization

et al. 2019

Angew Chem Int Ed

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The polydimethylsiloxane (PDMS) membrane commonly used for separation of biobutanol from fermentation broth fails to meet demand owing to its discontinuous and polluting thermal fabrication. Now, an UV‐induced polymerization strategy is proposed to realize the ultrafast and continuous fabrication of the PDMS membrane. UV‐crosslinking of synthesized methacrylate‐functionalized PDMS (MA‐PDMS) is complete within 30 s. The crosslinking rate is three orders of magnitude larger than the conventional thermal crosslinking. The MA‐PDMS membrane shows a versatile potential for liquid and gas separations, especially featuring an excellent pervaporation performance for n‐butanol. Filler aggregation, the major bottleneck for the development of high‐performance mixed matrix membranes (MMMs), is overcome, because the UV polymerization strategy demonstrates a freezing effect towards fillers in polymer, resulting in an extremely high‐loading silicalite‐1/MA‐PDMS MMM with uniform particle distribution.

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Mixed matrix membranes with molecular-interaction-driven tunable free volumes for efficient bio-fuel recovery

Abstract: Molecular interactions were constructed to control polymer chain conformation to fabricate mixed matrix membranes with tunable free volumes, exhibiting simultaneously improved butanol permeability and selectivity.

Cited by 113 publications

References 71 publications

Effect of embedded activated carbon nanoparticles on the performance of polydimethylsiloxane (PDMS) membrane for pervaporation separation of butanol

Effect of embedded activated carbon nanoparticles on the performance of polydimethylsiloxane (PDMS) membrane for pervaporation separation of butanol

2D MXene Nanofilms with Tunable Gas Transport Channels

The Ultrafast and Continuous Fabrication of a Polydimethylsiloxane Membrane by Ultraviolet‐Induced Polymerization

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