| Issue |
E3S Web of Conf.
Volume 463, 2023
III International Conference on Improving Energy Efficiency, Environmental Safety and Sustainable Development in Agriculture (EESTE2023)
|
|
|---|---|---|
| Article Number | 01035 | |
| Number of page(s) | 6 | |
| Section | Sustainable Development in Agriculture | |
| DOI | https://doi.org/10.1051/e3sconf/202346301035 | |
| Published online | 13 December 2023 | |
Mathematical modeling of adsorption isotherms of water vapour on polymeric ionites used in agrochemical practice
1 Russian State Agrarian University - Moscow Timiryazev Agricultural Academy, Moscow, 127434, Russia
2 Moscow State Technological University Stankin, Moscow, 127055, Russia
* Corresponding author: mcxa_iv@inbox.ru
Polymeric ion-exchange materials (ionites) are used in agriculture to make substrates for complete and long-term plant nutrition. The main nutrients in bound form are contained on the ion-exchange groups of the ionite. The degree of dissociation of these groups, and thus the release of ions into the soil, depends on the moisture content. In case of heavy rainfall and during drought, the exchange properties of the ionite will be different. Therefore, the study of water adsorption in such ionites is a rather urgent problem. In this work, the water vapour adsorption by ionites is studied using a thermodynamic model that incorporates the interplay between changes in the energy of dissociation of ion-exchange groups and the osmotic effect. Within the framework of this approach adsorption isotherms are built in the range of air humidity from 0,1 to 1 at physically reasonable values of system parameters. Isotherms have a characteristic inflection point in the area of medium humidity, which allows them to be attributed to isotherms of the fifth type. The obtained model isotherms describe adsorption in mesoporous and microporous materials, which are ionites, and fully correspond to experimental adsorption isotherms of this type.
© The Authors, published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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