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首页> 美国卫生研究院文献>Membranes >Effect of Carbonic Anhydrase on CO2 Separation Performance of Thin Poly(amidoamine) Dendrimer/Poly(ethylene glycol) Hybrid Membranes
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Effect of Carbonic Anhydrase on CO2 Separation Performance of Thin Poly(amidoamine) Dendrimer/Poly(ethylene glycol) Hybrid Membranes

机译：碳酸酐酶对聚（酰胺基胺）树状大分子/聚（乙二醇）杂化膜的CO2分离性能的影响

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The effect of carbonic anhydrase (CA) on the separation performance of thin poly(amidoamine) (PAMAM) dendrimer/poly(ethylene glycol) (PEG) hybrid membranes was investigated. CA, a type of enzyme, was used to promote CO hydration and dehydration reactions and to assess whether these reactions were the rate-limiting step in CO permeation through the membrane. The relationship between the membrane thickness and the CO permeance was evaluated in CO /H or CO /He separation using PAMAM/PEG hybrid membranes (thickness: 10–100 μm) with and without CA. Without CA, the CO permeance of PAMAM/PEG hybrid membranes was not inversely proportional to the membrane thickness. On the other hand, with CA, the CO permeance was inversely proportional to the membrane thickness. It was implied that, without CA, the rate-limiting step of CO transport was either the CO hydration reaction at the feed side or the CO dehydration reaction at the permeate side. On the other hand, with CA addition, the rate-limiting step of CO transport was diffusion, and CO permeance could be increased without sacrificing the selectivity by reducing membrane thickness. The effect of the position of CA (i.e., on the surface and/or reverse surface) on CO separation performance was investigated to evaluate which reaction was the rate-limiting step of CO permeation through the membrane. It was suggested that the rate-limiting step of CO permeation was CO dehydration reaction at the permeate side.
机译：研究了碳酸酐酶（CA）对聚（酰胺基胺）（PAMAM）树枝状大分子/聚（乙二醇）（PEG）混合膜的分离性能的影响。 CA是一种酶，用于促进CO水合和脱水反应，并评估这些反应是否是CO透过膜渗透的限速步骤。使用带有和不带有CA的PAMAM / PEG杂化膜（厚度：10–100μm），通过CO / H或CO / He分离评估膜厚度与CO渗透率之间的关系。没有CA，PAMAM / PEG杂化膜的CO渗透率与膜厚度不成反比。另一方面，对于CA，CO渗透率与膜厚度成反比。暗示了在没有CA的情况下，CO传输的限速步骤是在进料侧的CO水合反应或在渗透侧的CO脱水反应。另一方面，通过添加CA，CO传输的限速步骤是扩散，并且可以通过减小膜厚度而在不牺牲选择性的情况下增加CO渗透。研究了CA的位置（即在表面和/或背面上）对CO分离性能的影响，以评估哪个反应是CO透过膜的速率限制步骤。提示CO渗透的限速步骤是在渗透侧的CO脱水反应。

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