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Adsorption of water vapor on MgCl2 × 6H2O salt surface
Abstract The adsorption of water vapor on dry solid films of MgCl2 × 6H2O salt was studied as a function of partial pressure of water over the temperature range 240–340 K using a flow reactor coupled to a modulated molecular beam mass spectrometer. The uptake of water was found to be completely reversible. The adsorption data are well described by a Freundlich isotherm with the heterogeneity parameter close to 0.5. The isosteric enthalpy of adsorption was found to be –(44.7 ± 1.2) kJ mol−1, independent of the salt surface coverage in the range (0.8–30) × 1015 molecule cm−2. An empirical equation is proposed for the amount of water adsorbed on MgCl2 × 6H2O as a function of relative humidity. Uptake of H2O on MgCl2 × 6H2O is observed to be much higher than on NaCl indicating that the amount of surface adsorbed water on mixed salts will be drastically dependent on the salt sample composition. The observed results support previous considerations that under atmospheric conditions sea salt particles are probably enveloped by a MgCl2 × 6H2O brine.
Highlights ► The adsorption of water vapor on dry solid films of MgCl2 × 6H2O salt was studied. ► The uptake of water was found to be completely reversible. ► The adsorption data are well described by a Freundlich isotherm with the heterogeneity parameter close to 0.5. ► The isosteric enthalpy of adsorption was found to be –(44.7 ± 1.2) kJ mol−1. ► The amount of surface adsorbed water on mixed salts is drastically dependent on the salt sample composition.
Adsorption of water vapor on MgCl2 × 6H2O salt surface
Abstract The adsorption of water vapor on dry solid films of MgCl2 × 6H2O salt was studied as a function of partial pressure of water over the temperature range 240–340 K using a flow reactor coupled to a modulated molecular beam mass spectrometer. The uptake of water was found to be completely reversible. The adsorption data are well described by a Freundlich isotherm with the heterogeneity parameter close to 0.5. The isosteric enthalpy of adsorption was found to be –(44.7 ± 1.2) kJ mol−1, independent of the salt surface coverage in the range (0.8–30) × 1015 molecule cm−2. An empirical equation is proposed for the amount of water adsorbed on MgCl2 × 6H2O as a function of relative humidity. Uptake of H2O on MgCl2 × 6H2O is observed to be much higher than on NaCl indicating that the amount of surface adsorbed water on mixed salts will be drastically dependent on the salt sample composition. The observed results support previous considerations that under atmospheric conditions sea salt particles are probably enveloped by a MgCl2 × 6H2O brine.
Highlights ► The adsorption of water vapor on dry solid films of MgCl2 × 6H2O salt was studied. ► The uptake of water was found to be completely reversible. ► The adsorption data are well described by a Freundlich isotherm with the heterogeneity parameter close to 0.5. ► The isosteric enthalpy of adsorption was found to be –(44.7 ± 1.2) kJ mol−1. ► The amount of surface adsorbed water on mixed salts is drastically dependent on the salt sample composition.
Adsorption of water vapor on MgCl2 × 6H2O salt surface
Bedjanian, Yuri (author) / Loukhovitskaya, Ekaterina (author)
Atmospheric Environment ; 45 ; 2373-2378
2011-02-10
6 pages
Article (Journal)
Electronic Resource
English
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