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Borate-Catalyzed Carbon Dioxide Hydration via the Carbonic Anhydrase Mechanism

机译:硼酸经碳酸酐酶催化的二氧化碳水合

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摘要

The hydration of CO_2 plays a critical role in carbon capture and geoengineering technologies currently under development to mitigate anthropogenic global warming and in environmental processes such as ocean acidification. Here we reveal that borate catalyzes the conversion of CO_2 to HCO3~ via the same fundamental mechanism as the enzyme carbonic anhydrase, which is responsible for CO_2 hydration in the human body. In this mechanism the tetrahydroxyborate ion, B(OH)4~, is the active form of boron that undergoes direct reaction with CO_2. In addition to being able to accelerate CO_2 hydration in alkaline solvents used for carbon capture, we hypothesize that this mechanism controls CO_2 uptake by certain saline bodies of water, such as Mono Lake (California), where previously inexplicable influx rates of inorganic carbon have created unique chemistry. The new understanding of CO_2 hydration provided here should lead to improved models for the carbon cycle in highly saline bodies of water and to advances in carbon capture and geoengineering technology.
机译:CO_2的水合作用在当前正在开发的碳捕获和地球工程技术中,以减轻人为的全球变暖以及在海洋酸化等环境过程中发挥关键作用。在这里,我们揭示了硼酸盐通过与碳酸酐酶相同的基本机理催化CO_2向HCO3〜的转化,而碳酸酐酶负责人体内的CO_2水合。在这种机理中,四羟基硼酸根离子B(OH)4〜是与CO_2直接反应的硼的活性形式。除了能够加速用于碳捕获的碱性溶剂中的CO_2水合之外,我们还假设该机制控制了某些盐水体(例如,莫诺湖(加利福尼亚州))对CO_2的吸收,以前曾产生了无法解释的无机碳涌入速率独特的化学。此处提供的对CO_2水化的新认识应导致改进高盐度水体中碳循环的模型,并促进碳捕获和地球工程技术的发展。

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  • 来源
    《Environmental Science & Technology》 |2011年第11期|p.4802-4807|共6页
  • 作者单位

    State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China,Department of Chemical and Biomolecular Engineering, The University of Melbourne, Victoria 3010, Australia;

    Department of Chemical and Biomolecular Engineering, The University of Melbourne, Victoria 3010, Australia;

    Department of Chemical and Biomolecular Engineering, The University of Melbourne, Victoria 3010, Australia;

    State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;

    State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;

    State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;

    Department of Chemical and Biomolecular Engineering, The University of Melbourne, Victoria 3010, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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