Biocatalytic Janus membranes for CO<sub>2</sub> removal utilizing carbonic anhydrase

Hou, Jingwei; Ji, Chao; Dong, Guangxi; Xiao, Bowen; Ye, Yun; Chen, Vicki

doi:10.1039/c5ta01756d

Cited by 96 publications

(54 citation statements)

References 39 publications

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“…However, it also reduces the driving force of CO 2 hydration due to the rapid local saturation of the hydrated CO 2 near the interface. Compared with the CO 2 hydration reactor with the biocatalytic membrane we previously reported, such a bubbling reactor presents nearly 20 times higher CO 2 hydration effi ciency with normalized membrane area, [ 8 ] suggesting the high effi ciency of the Janus bubbling reactor reported here. We applied CO 2 /N 2 mixed gas (20/80, v/v) to investigate the CO 2 hydration with the Janus membrane equipped bubbling reactor ( Figure 4 a).…”

Section: Doi: 101002/admi201500774supporting

confidence: 54%

“…The pore size shows no obvious change after modifi cation ( Figure S3, Supporting Information). [7][8][9] For aeration in these processes, the bubble size signifi cantly affect the gas/liquid mass transfer and the whole process efficiency. However, the water drops gradually permeate through the membrane pores with the decrease of contact angle and drop conjugate diameter (CD), which is caused by the directional transport of water within a Janus membrane.…”

mentioning

confidence: 99%

“…Figure 2 c shows that a hemispherical bubble grows on the gas/solid interface when bubbling through the nascent membrane. [7][8][9] For aeration in these processes, the bubble size signifi cantly affect the gas/liquid mass transfer and the whole process efficiency. In contrast, a spherical bubble is observed in the Bubble aeration has been widely applied in many processes for energy production, environmental remediation, chemical engineering, and aquaculture.…”

mentioning

confidence: 99%

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Janus Membranes with Asymmetric Wettability for Fine Bubble Aeration

Yang

Hou

Wan

et al. 2016

Adv Materials Inter

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128

106

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aeration. The membrane is consisted with a hydrophilic/superaerophobic coating on a hydrophobic porous support, which shows cooperative water and gas penetration. [19][20][21][22][23][24][25] The superaerophobic side allows rapid bubble detachment and reduced bubble size, while the hydrophobic side prevents water from permeating through the membrane pores and traps gas into the pores to lower the intrusion pressure. As a result, we have achieved greatly improved gas/liquid mass transfer, as exemplifi ed with both O 2 involved dopamine (DA) oxypolymerization and CO 2 involved biocatalytic hydration processes.As we mentioned above, superaerophobicity can be achieved by adjusting the surface wettability and hierarchical structures. Considering the porous nature of typical polypropylene membrane, we hydrophilized its surface to improve aerophobicity. To this end, we conducted single-sided polydopamine/polyethyleneimine (PDA/PEI) codeposition for asymmetric surface modifi cation. [26][27][28] The ethanol prewetted polypropylene membrane was fl oated on a DA/PEI solution for 4 h as illustrated in Figure 1 a. Then the Janus membrane was obtained and the immersed side turned brown after deposition (Figures S1 and S2, Supporting Information). The pore size shows no obvious change after modifi cation ( Figure S3, Supporting Information). The PDA/PEI-modifi ed side is signifi cantly hydrophilic and the water drops infi ltrate into the membrane pores immediately, while the other side remains hydrophobic with an initial water contact angle of about 110° (Figure 1 b). However, the water drops gradually permeate through the membrane pores with the decrease of contact angle and drop conjugate diameter (CD), which is caused by the directional transport of water within a Janus membrane. [ 19 ] We also investigated the submerged gas wetting behaviors on the membrane surfaces. The unmodifi ed surface is moderate aerophilic with a GCA around 80°, arising from its hydrophobicity and air trapped in the membrane pores ( Figure 2 a), while the PDA/PEI-modifi ed side is superaerophobic and repels to air bubbles (Figure 2 b). The gas adhesion work was calculated by detecting the GCA on a fl at polypropylene fi lm, which decreases from 61.3 to 6.29 mJ m −2 after hydrophilic modifi cation. The porous structure will further reduce the apparent gas adhesion work according to the Cassie-Baxter model. [ 29 ] The decrease of triple phase contact line (TPCL) leads to low air adhesion on the membrane surface during the bubbling process.The bubble formation process was recorded by a high-speed camera to investigate the effects of surface wettability on bubbling behavior. Figure 2 c shows that a hemispherical bubble grows on the gas/solid interface when bubbling through the nascent membrane. It detaches from the surface until the gas/ solid CD reaches 4 mm, leaving a thin gas fi lm on the membrane surface. In contrast, a spherical bubble is observed in the Bubble aeration has been widely applied in many processes for energy production, environmental ...

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Section: Doi: 101002/admi201500774supporting

confidence: 54%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Janus Membranes with Asymmetric Wettability for Fine Bubble Aeration

Yang

Hou

Wan

et al. 2016

Adv Materials Inter

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128

106

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“…Enantioselective CMs can be prepared by direct immobilisation of living cells or isolated enzymes into membranes. For example, Serratia plymuthia cells immobilised in a hollow‐fibre bioreactor were used to catalyse the isomerisation of sucrose to palatinose, and polygalacturonase embedded within a magnetic‐field‐responsive membrane reactor was used for the selective hydrolysis of citrus pectin .…”

Section: Chiral Catalytic Membranesmentioning

confidence: 99%

“…Catalyst immobilisation with an IL has also been employed in the transformation and separation of CO 2 from gas mixtures. The enzyme, carbonic anhydrase, immobilised on a hollow‐fibre polypropylene membrane with [BMIm][Tf 2 N] efficiently converts carbon dioxide into bicarbonate . The membrane efficiency was further enhanced by the addition of a hydrophobic poly(vinylidene fluoride) membrane layer, which prevented pore blocking and minimised the CO 2 diffusion length through the reaction solvent (water).…”

Section: Ionic‐liquid Catalytic Membranesmentioning

confidence: 99%

Catalytic Ionic‐Liquid Membranes: The Convergence of Ionic‐Liquid Catalysis and Ionic‐Liquid Membrane Separation Technologies

et al. 2017

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Membrane technologies enable the facile separation of complex mixtures of gases, vapours, liquids and/or solids under mild conditions. Simultaneous chemical transformations can also be achieved in membranes by using catalytically active membrane materials or embedded catalysts, in so‐called membrane reactors. A particular class of membranes containing or composed of ionic liquids (ILs) or polymeric ionic liquids (pILs) have recently emerged. These membranes often exhibit superior transport and separation properties to those of classical polymeric membranes. ILs and pILs have also been extensively studied as separation solvents, catalysts and co‐catalysts in similar applications for which membranes are employed. In this review, after introducing ILs and their applications in catalysis, catalytic membranes and recent advances in membrane separation processes based on ILs are described. Finally, the nascent concept of catalytic IL membranes is highlighted, in which catalytically active ILs/pILs are incorporated into membrane technologies to act as a catalytic separation layer.

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Dopamine: Just the Right Medicine for Membranes

Yang

Waldman

et al. 2018

Adv Funct Materials

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241

162

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Mussel-inspired chemistry has attracted widespread interest in membrane science and technology. Demonstrating the rapid growth of this field over the past several years, substantial progress has been achieved in both mussel-inspired chemistry and membrane surface engineering based on musselinspired coatings. At this stage, it is valuable to summarize the most recent and distinctive developments, as well as to frame the challenges and opportunities remaining in this field. In this review, we present recent advances in rapid and controllable deposition of mussel-inspired coatings, dopamine-assisted co-deposition technology and photo-initiated grafting directly on mussel-inspired coatings. Some of these technologies have not yet been employed directly in membrane science. Beyond discussing advances in conventional membrane processes, we discuss emerging applications of mussel-inspired coatings in membranes, including as a skin layer in nanofiltration, interlayer in metalorganic framework based membranes, hydrophilic layer in Janus membranes and protective layer in catalytic membranes. Finally, we raise some critical unsolved challenges in this field and propose some potential pathways to address them.

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Biocatalytic Janus membranes for CO₂ removal utilizing carbonic anhydrase

Cited by 96 publications

References 39 publications

Janus Membranes with Asymmetric Wettability for Fine Bubble Aeration

Janus Membranes with Asymmetric Wettability for Fine Bubble Aeration

Catalytic Ionic‐Liquid Membranes: The Convergence of Ionic‐Liquid Catalysis and Ionic‐Liquid Membrane Separation Technologies

Dopamine: Just the Right Medicine for Membranes

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Biocatalytic Janus membranes for CO2 removal utilizing carbonic anhydrase

Cited by 96 publications

References 39 publications

Janus Membranes with Asymmetric Wettability for Fine Bubble Aeration

Janus Membranes with Asymmetric Wettability for Fine Bubble Aeration

Catalytic Ionic‐Liquid Membranes: The Convergence of Ionic‐Liquid Catalysis and Ionic‐Liquid Membrane Separation Technologies

Dopamine: Just the Right Medicine for Membranes

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Biocatalytic Janus membranes for CO₂ removal utilizing carbonic anhydrase