Adsorption Properties of Aqueous Methylene Blue on Mesocellular Foam Silica: Equilibrium, Kinetic, Isotherm, and Thermodynamic Characterization
Abstract
Mesocellular foam silica was prepared by a hydrothermal synthesis protocol. The surface and pore structure of mesocellular foam silica were characterized by low temperature nitrogen adsorption isotherms, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and Fourier transform infrared (FT-IR) spectroscopy. The methylene blue was adsorbed by the synthetic mesocellular foam silica; the optimized adsorption conditions were evaluated and the maximum adsorption capacity of methylene blue by mesocellular foam silica was determined to be 215.5 mg g−1. The kinetics of the adsorption of methylene blue by mesocellular foam silica were in accordance with a quasi-second-order kinetic equation. The results were analyzed by Langmuir and Freundlich adsorption isotherm models. The adsorption of methylene blue on mesocellular foam silica was shown to follow the Freundlich adsorption isotherm model. The Gibbs free energy change during adsorption showed that this process was spontaneous. The enthalpy change in the process was –28.868 J·mol−1 K−1, indicating that the adsorption is exothermic. The negative value of entropy –49.296 J·mol−1 K-1 shows that the system disorder decreases due to adsorption.
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Decrease in total pore volume, average pore size, and specific surface area occurred because holes of mesocellular silica foam were partly filled with methylene blue after adsorption.
“The results showed a decrease in the total pore volume, average pore size, and specific surface area because the holes of mesocellular silica foam were partly filled with methylene blue after its adsorption [93].”
From Silica Aerogels as a Promising Vehicle for Effective Water Splitting for Hydrogen Production (2025) · cites this paper as [93]
Pore diameter and volume of mesocellular silica foam observed 9.34 nm and 1.36 cm3/g, decreased to 8.03 nm and 0.67 cm3/g after adsorption of methylene blue.
“They calculated the pore size of the mesocellular silica foam before and after the adsorption of the methylene blue, where the pore diameter and pore volume observed were 9.34 nm and 1.36 cm3 g−1, which decreased with values of 8.03 nm and 0.67 cm3 g−1 after the adsorption of methylene blue.”
From Silica Aerogels as a Promising Vehicle for Effective Water Splitting for Hydrogen Production (2025) · cites this paper as [93]
Surface area of mesocellular silica foam with methylene blue was 399 m2/g, and in its absence 585 m2/g.
“The surface of the foam silica with a mesocellular structure with methylene blue was 399 m2 g−1, and in its absence, it was 585 m2 g−1.”
From Silica Aerogels as a Promising Vehicle for Effective Water Splitting for Hydrogen Production (2025) · cites this paper as [93]
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Silica Aerogels as a Promising Vehicle for Effective Water Splitting for Hydrogen Production
Vadanagekar, A., Lapcik, L., Kvitek, L., & Lapcikova, B. (2025) · Molecules · doi:10.3390/molecules30061212 · Cited by 4 · see citing works
- Authors
- Zhai, Q.-Z., & Dong, Y.
- Affiliations
- Changchun University of Science and Technology (CN)
- Corresponding author
- Zhai, Qing-Zhou
- Venue
- Instrumentation Science & Technology
- Publisher
- Informa UK Limited
- Published
- 2019-04-05
- Volume
- 47
- Issue
- 5
- Pages
- 467-484
- ISSN
- 1073-9149 (ISSN-L)
- 1525-6030
- OpenAlex
- W2930351187
- Cited by
- 2
- References
- 17
- Citations by year
- 2025: 2
- FWCI
- 0.00
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Instrumentation Science & Technology (publishedVersion)
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Materials Science › Materials Chemistry › Mesoporous Materials and Catalysis
- Physical Sciences › Chemistry › Spectroscopy › Adsorption, diffusion, and thermodynamic properties of materials
- Keywords
- methylene blue, dye adsorption, hydrothermal synthesis, adsorption kinetics, pseudo-second-order kinetics, Freundlich isotherm, Langmuir isotherm, adsorption thermodynamics, dye removal, porous media
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