Chemical Physics Letters, Vol.717, 47-52, 2019
Understanding the Raman spectroscopic quantification and dissolving behaviors of CO2 for the CO2-H2O system 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 < 353 K and the repulsive forces between H2O and CO2 at P (pressure) > similar to 20 MPa but the molecular thermal motions at P <= similar to 20 MPa when T >= 353 K.