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首页> 外文期刊>Environmental Science & Technology >Structure-Dependent Interactions between Alkali Feldspars and Organic Compounds: Implications for Reactions in Geologic Carbon Sequestration
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Structure-Dependent Interactions between Alkali Feldspars and Organic Compounds: Implications for Reactions in Geologic Carbon Sequestration

机译：碱长石与有机化合物之间的结构依赖性相互作用：地质固碳反应的意义

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摘要

Organic compounds in deep saline aquifers may change supercritical CO_2 (scCO_2)-induced geochemical processes by attacking specific components in a mineral's crystal structure. Here we investigate effects of acetate and oxalate on alkali feldspar-brine interactions in a simulated geologic carbon sequestration (GCS) environment at 100 atm of CO_2 and 90 ℃. We show that both organics enhance the net extent of feldspar's dissolution, with oxalate showing a more prominent effect than acetate. Further, we demonstrate that the increased reactivity of Al-O-Si linkages due to the presence of oxalate results in the promotion of both Al and Si release from feldspars. As a consequence, the degree of Al-Si order may affect the effect of oxalate on feldspar dissolution: a promotion of ～500% in terms of cumulative Si concentration was observed after 75 h of dissolution for sanidine (a highly disordered feldspar) owing to oxalate, while the corresponding increase for albite (a highly ordered feldspar) was ～90%. These results provide new insights into the dependence of feldspar dissolution kinetics on the crystallographic properties of the mineral under GCS conditions.
机译：深层盐水层中的有机化合物可能会通过攻击矿物晶体结构中的特定成分来改变超临界CO_2（scCO_2）诱导的地球化学过程。在此，我们研究了在100atm的CO_2和90℃的模拟地质碳固存（GCS）环境中乙酸盐和草酸盐对碱金属长石-盐水相互作用的影响。我们表明，两种有机物均能提高长石溶解的净程度，草酸盐显示出比乙酸盐更为突出的作用。此外，我们证明了由于草酸盐的存在，增加了Al-O-Si键的反应性，从而促进了长石中Al和Si的释放。结果，Al-Si有序度可能会影响草酸盐对长石溶解的影响：在山梨定（高度无序的长石）溶解75 h后，观察到累积Si浓度提高了〜500％（按累积Si浓度计）。草酸盐，而钠长石（高度有序的长石）的相应增加量约为90％。这些结果为在GCS条件下长石溶解动力学对矿物晶体学特性的依赖性提供了新的见解。

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  • 来源
    《Environmental Science & Technology》 |2013年第1期|150-158|共9页
  • 作者

    Yi Yang; Yujia Min; Young-Shin Jun;

  • 作者单位

    Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States;

    Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States;

    Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States;

  • 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);
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  • 正文语种 eng
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