АДСОРБЦИЯ МЕТИЛЕНОВОГО СИНЕГО НА ГИДРОФИЛЬНОМ И ГИДРОФОБНОМ КРЕМНЕЗЕМЕ
The article studies the processes of methylene blue (MB) adsorption on hydrophilic and hydrophobic silica. It is shown that the equilibrium sorption capacity on hydrophilic SiO₂ reaches 21.9 mg/g at 45°C, and on hydrophobic SiO₂ – 13.9 mg/g under the same conditions. The adsorption kinetics is described by the pseudo-second-order model, and the thermodynamic parameters (ΔH° = +5.55…+6.88 kJ/mol, ΔG° = –1.5…–2.0 kJ/mol) indicate the endothermic and spontaneous nature of the process. The results allow us to draw conclusions about the interaction mechanism and the possibility of using such sorbents for wastewater treatment from organic dyes.
1. Ho Y.S., McKay G. Pseudo-second order model for sorption processes // Process Biochemistry. – 1999. – Vol. 34. – P. 451–465.
2. Li Y., Li Z., Chen L., et al. Gradient adsorption of methylene blue and crystal violet onto organic microporous silica // ACS Omega. – 2020. – Vol. 5, № 51. – P. 31487–31496.
3. Zhai Q.-Z., Wang S., Liu J., et al. Adsorption of methylene blue onto nano-SBA-15: kinetics and isotherms // Desalination and Water Treatment. – 2019. – Vol. 158. – P. 330–338.
4. Foo K. Y., Hameed B. H. Insights into the modeling of adsorption isotherm systems // Chem. Eng. J. – 2010. – Т. 156, № 1. – С. 2–10.
5. Ho Y. S., McKay G. Pseudo-second order model for sorption processes // Process Biochem. – 1999. – Т. 34. – С. 451–465.
6. Zhang L., Wang Y., Li H. Photocatalytic performance of ZnO/SiO₂ hybrid materials under visible light irradiation // Mater. Sci. Semicond. Process. – 2019. – Т. 100. – С. 173–180.
7. Foo K.Y., Hameed B.H. Insights into the modeling of adsorption isotherm systems // Chemical Engineering Journal. – 2010. – Vol. 156, № 1. – P. 2–10.
8. Dąbrowski A. Adsorption - From theory to practice // Advances in Colloid and Interface Science. – 2001. – Vol. 93, № 1–3. – P. 135–224.
9. Tsunoda K.-I., Umemura T., Ueno H., Okuno E., Akaiwa H. Adsorption of methylene blue onto silylated silica surfaces // Applied Spectroscopy. – 2003. – Vol. 57, № 10. – P. 1273–1277.
10. Сотиболдиев Б.С., Гулямов Б.Б., Рахмонов Ж.А., Каттаев Н.Т., Боймирзаев А.С., Акбаров Х.И. Синтез и характеристика гидрофобного кремнезема // Universum: химия и биология, 2023, 10(112). DOI - 10.32743/UniChem.2023.112.10.16060.
11. Ж.К. Маматов, О.Н. Рузимурадов, Н.Т. Каттаев, Х.И. Акбаров. Изучение капиллярно-пористой структуры гибридных ПАН-кремнеземных композиций // Узб. хим. журн., 2020. – № 3. – С. 16-22.
Copyright (c) 2025 «ACTA NUUz»
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
.jpg)
1.png)
