BONDING OF POROUS STRUCTURE AND SOIL MOISTURE RETENTION IN MODIFICATION SURFACTANTS AND POLYMERS

Аннотация

In this paper, the relationship between the parameters of the porous structure and the moisture retention capacity of soils modified with a surfactant (sulfonyl) and polymer additive C9 was investigated. Water vapour sorption isotherms were obtained by excitatory method, and the parameters of the porous structure were calculated according to BAT theory. The infrared spectroscopy method was used to analyze changes in the chemical nature of soil surfaces after modification. It is shown that the introduction of organic additives leads to a significant increase in water vapour sorption compared with the original soil sample. Modification by sulfonyl mainly contributes to increase the number of hydrophilic centers of the surface and development of microporosity, which is manifested in the growth of the monolayer capacity of sorption and strengthening the absorption bands of O-H groups in IR spectra. At the same time, polymer additive K9 has a major influence on the structural organization of the pore space, contributing to the development of mesoporosity and increasing moisture retention in soils at medium and high relative pressures. Comprehensive analysis of infrared spectroscopy data, MET parameters and sorption isotherm confirms that the improvement in soil moisture retention under the action of surfactants and polymers is complex structurally-chemical. The results obtained are of practical relevance for regulating the water regime of soils and developing effective soil conditioners for arid regions.