Abstract
Adsorption of light and heavy water (H2O and D2O) on porous hypercross-linked polystyrene MN-272 was studied by gas chromatography. For the estimation of the properties of this polymer surface, n-alkanes (C6—C9), C6 6, and polar compounds (CHCl3, MeNO2, MeCN, Me2CO, EtCOOCH3, Et2O) were used as test adsorbates. The contributions of energies of dispersion and specific (donor-acceptor) intermolecular interactions to the total energy of adsorption were determined on the basis of experimental data on the retention of the sorbates. The electron-donor and electron-acceptor characteristics of the hypercross-linked polystyrene MN-272 surface were estimated. Hypercross-linked polystyrene MN-272 was found to be a weakly specific adsorbent with predomination of electron-donating properties. The adsorption isotherms of H2O and D2O were measured on this polymer at 50, 60, and 70 °C. The dependences of the isosteric heats of adsorption on the amount adsorbed were determined. The contribution of the energy of specific interactions to the total energy of adsorption for all polar adsorbates (except for acetone, light and heavy water) does not exceed 20%. Adsorption of H2O on hypercross -linked polystyrene MN-272 is slightly weaker than that of D 2O.
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M is the molecular weight, fu is the dipole moment, μ is the total polarizability of a molecule, AN and DN are the electron-acceptor and electron-donor energy characteristics of molecules. 3
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 713-716, April, 2009.
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Lanin, S.N., Pashkova, E.B., Kovaleva, N.V. et al. Adsorption of water isotopomers H2O and D2O on hypercross-linked polystyrene MN-272. Russ Chem Bull 58, 729–732 (2009). https://doi.org/10.1007/s11172-009-0085-4
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DOI: https://doi.org/10.1007/s11172-009-0085-4