Understanding the Raman spectroscopic quantification and dissolving behaviors of CO2 for the CO2–H2O system from water structure

[Display omitted] •Solubility of CO2 in H2O can be measured using Raman spectroscopy.•Raman quantitative parameter has different linear trends below and above 404 K.•Temperature dependences of quantitative parameters are explained.•Dissolving behaviors of CO2 in H2O are understood from water structu...

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Bibliographic Details
Published in:Chemical physics letters 2019-02, Vol.717, p.47-52
Main Authors: Hu, Qingcheng, Zhao, Haiwen, Li, Hongxia, Dong, Yunfang, Liu, Zhongxing
Format: Article
Language:English
Subjects:
CO2 dissolving
Raman spectroscopy
Water structure
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Summary:[Display omitted] •Solubility of CO2 in H2O can be measured using Raman spectroscopy.•Raman quantitative parameter has different linear trends below and above 404 K.•Temperature dependences of quantitative parameters are explained.•Dissolving behaviors of CO2 in H2O are understood from water structure. The parameter for measuring the solubility of CO2 in H2O using Raman spectroscopy shows different changing trends with temperature (T) above and below 404 K, due to the distinct temperature dependences of the two main non-tetrahedral water structures. The variable dissolving behaviors of CO2 in H2O could be understood based on the tetrahedral water structures and weak CO2-H2O hydrogen bonds when T  ∼20 MPa but the molecular thermal motions at P ≤ ∼20 MPa when T ≥ 353 K.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2019.01.005