Сорбція бензену з водних розчинів аеросилогелем з хімічно закріпленими β-циклодекстриновими групами

• Дата: 2024
• Автор: Ляшенко , Д. Ю.
• Формат: Стаття
• Мова: Українська
• Опубліковано: Chuiko Institute of Surface Chemistry National Academy of Sciences of Ukraine 2024
• Теми: аеросилогель; -циклодекстрин; бензен; сорбція; моделі Ленгмюра і Фрейндліха псевдо перший та псевдо другий порядок; спектрофотометрія
• Онлайн доступ: https://surfacezbir.com.ua/index.php/surface/article/view/786
• Назва журналу: Surface

Benzene and its derivatives, which belong to highly toxic organic substances, have hydrophobic properties and will probably be removed from water environments by sorbents on the surface of which there are hydrophobic ligands, for example, cyclodextrins. Their molecules have a unique torus structure with wide and narrow holes, on which secondary and primary hydroxyl groups are located, respectively, and are characterized by a hydrophobic inner cavity and hydrophilic properties of the torus surface. Due to the hydrophobic cavity, these molecules are able to form inclusion complexes of the "host-guest" type with the help of non-specific interactions (van der Waals forces, hydrogen bonds and hydrophobic interactions) with many organic molecules of the size corresponding to thorium. The purpose of the work is to determine the sorption capacity of the original and modified with aminopropyl and β-cyclodextrin functional groups aerosilogels with respect to benzene from aqueous solutions. The sorption of small concentrations of benzene from aqueous solutions by aerosilogels with silanol, grafted aminopropyl and surface β-cyclodextrin-containing groups was studied by spectrophotometry, depending on the duration of contact and the equilibrium concentration. It has been demonstrated that all β-cyclodextrin groups attached to the surface of the aerosilogel participate in benzene sorption and possibly form surface complexes of the "host-guest" type with benzene molecules. The obtained results were analyzed using kinetic models for pseudo-first and pseudo-second order processes. High kinetic parameters of benzene sorption by aerosilogel grafted with β-cyclodextrin groups were established. It is shown that sorption kinetic processes are well described by a pseudo-first-order equation. Based on the calculations of equilibrium sorption parameters within the framework of the Langmuir and Freundlich models, it was proved that the experimental results of the equilibrium sorption of benzene on β-cyclodextrin-containing aerosilogel are in good agreement with the Langmuir adsorption equation, which proves the decisive contribution of grafted β-cyclodextrin groups to benzene sorption. It has been demonstrated that the introduction of β-cyclodextrin groups into the surface layer of aerosilogel significantly increases its selectivity and will contribute to an increase in affinity for benzene and its derivatives.