Kinetic investigation of water physisorption on natural clinoptilolite at room temperature
| Autor: | C. Camerlingo, G. Carotenuto |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Clinoptilolite
Materials science Chemical polarity Kinetics Thermodynamics 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Reaction rate constant Adsorption Physisorption Mechanics of Materials Desorption Molecule General Materials Science 0210 nano-technology |
| Zdroj: | Microporous and Mesoporous Materials. 302:110238 |
| ISSN: | 1387-1811 |
| DOI: | 10.1016/j.micromeso.2020.110238 |
| Popis: | Charge balancing extra-framework cations play a fundamental role in the adsorption/desorption of polar molecules on zeolites. The way cations interact with polar molecules (e.g. water) in combination with the negatively charged framework and the kinetics of such interaction is extremely important for designing novel devices based on these functional materials. Kinetic investigation and mechanistic modeling of these processes can be conveniently performed by electrical tests, based on biasing the clinoptilolite sample with a constant a.c. voltage (20Vpp, 5kHz) and monitoring the temporal evolution of the current intensity during the adsorption/desorption processes. According to this kinetic analysis, adsorption is described by the Lagergren pseudo-first-order model with a rate constant of (5.86 ± 0.09)·10−3 min−1, while water desorption in dry air follows a first-order kinetic model with a specific rate of (2.02 ± 0.003)·10−2 min−1 at 25°C. According to these models, the water molecule to be adsorbed is first caught by the cation electric field and then transferred at the cation-framework interface to maximize non-bonding interactions. |
| Databáze: | OpenAIRE |
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