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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Biocatalytic Janus membranes for CO2 removal utilizing carbonic anhydrase
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Biocatalytic Janus membranes for CO2 removal utilizing carbonic anhydrase

机译：利用碳酸酐酶去除二氧化碳的生物催化Janus膜

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A novel hydrophilic-superhydrophobic biocatalytic membrane was developed for CO2 capture with a gas-liquid membrane contactor. This "Janus" membrane contains a layer of hydrophilic carbon nanotubes (CNTs) coated on a fluorosilane treated superhydrophobic membrane support. Carbonic anhydrase (CA) was then immobilized on the hydrophilic CNT side, which was located at the CO2-solvent interface within a gas-liquid membrane contactor, whilst the superhydrophobic porous side of the membrane was oriented towards the gas phase. This "Janus" configuration ensured that the immobilized CA remained hydrated, and minimized the CO2 diffusion length in the solvent. The CNT coating layer showed good integrity and adhesion to the membrane, and the effect of superhydrophobic treatment on the porous structure of the membrane was negligible. The p-NPA assay results revealed that up to 30% CA activity was retained after immobilization. Further, the CO2 hydration test confirmed that the immobilized CA possessed significantly improved catalytic efficiency when compared with the equal amount of free CA. Effective regeneration of the enzyme coating was demonstrated over five cycles. The novel "Janus" membrane developed in this study exhibits great potential to be used as an immobilization support for a wide variety of enzymes not only CA for CO2 capture but also other types of enzymes in different applications.
机译：开发了一种新型的亲水-超疏水生物催化膜，利用气液膜接触器捕获CO2。该“ Janus”膜包含涂覆在氟硅烷处理的超疏水性膜载体上的亲水性碳纳米管（CNT）层。然后将碳酸酐酶（CA）固定在亲水性CNT侧，该侧位于气液膜接触器内的CO2溶剂界面，而膜的超疏水性多孔侧朝向气相。这种“ Janus”构型确保了固定化的CA保持水合状态，并使CO2在溶剂中的扩散长度最小。 CNT涂层显示出良好的完整性和对膜的粘附性，并且超疏水处理对膜的多孔结构的影响可忽略不计。 p-NPA分析结果表明，固定后最多保留30％的CA活性。此外，CO 2水合测试证实，与等量的游离CA相比，固定化的CA具有显着提高的催化效率。在五个循环中证明了酶涂层的有效再生。在这项研究中开发的新型“ Janus”膜具有巨大的潜力，不仅可以用作捕获二氧化碳的CA的酶，而且还可以用作多种酶的固定化支持物，还可以用于其他用途的其他类型的酶。

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