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Adsorption of sodium iodine at air/water interface

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Open access
Authors
Nguyen, C.V.
Nakahara, H.
Shibata, O.
Phan, Chi
Date
2020
Type
Journal Article

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Nguyen, C.V. and Nakahara, H. and Shibata, O. and Phan, C.M. 2020. Adsorption of sodium iodine at air/water interface. Journal of Molecular Liquids. 298: Article No. 112076.
Source Title
Journal of Molecular Liquids
DOI
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Faculty
Faculty of Science and Engineering
School
WASM: Minerals, Energy and Chemical Engineering
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Abstract

© 2019 Elsevier B.V.

The change in surface potential was measured for NaI solutions. The modelled surface charge was then calculated and compared with molecular simulations. It was found that I− was enhanced at the air/water interface more than Na+. The result, which was confirmed by simulations, was opposite to the previous observation with NaCl. The trend is also consistent with anionic effects: larger and more polar anions adsorbed stronger at the air/water interface. The theoretical model was applied successfully to describe the changes for both systems, which are positive for NaCl and negative for NaI, respectively. The combined results of the two systems also revealed that the self-ionization of pure water induced a positive surface charge at 16.9 mV.

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