Abstract
Activated carbon (AC) was prepared from date palm leaflets using NaOH activation. AC was oxidized using concentrated HNO3 to produce oxidized activated carbon (ON). Alkylamines including methylamine (M), dimethylamine (DM), ethylamine (E), diethylamine (DE), and diisopropylamine (DIP) were covalently immobilized onto ON to produce ONM, ONDM, ONE, ONDE, and ONDIP hydrophobic activated carbons, respectively. The surface area of AC (588 m2/g) decreased on oxidation with a further decrease on functionalization. These carbons were tested for methylene blue (MB) adsorption. Initial pH 7 was found optimum for the adsorption of MB. The hydrophobic activated carbons show faster adsorption (except for ONDE), than AC with adsorption data following well a pseudo-second-order kinetic model. The rate of adsorption increased with temperature rise. The activation energy, Ea, was less than 42 kJ/mol indicating physical adsorption. Equilibrium adsorption follows L-type isotherm with the adsorption data following well the Langmuir model. The adsorption capacity of MB follows the order of ONDIP > ONE > ONDM > AC > ON > ONM > ONDE. Thermodynamic parameters indicate spontaneous and endothermic adsorption. Carbon reuse for MB adsorption was more efficient for ONDIP, ONE, and ONDM than AC
Keywords
Publication details
- DOI
- 10.53539/squjs.vol28iss1pp42-52
- Journal
- Sultan Qaboos University Journal for Science, 28(1), 42-52
- Publisher
- Sultan Qaboos University
- Open access
- Gold open access
- License
- CC BY-ND 4.0
Cite this article
APA 7
El-Shafey, E. S. I., & Al-Mashaikhi, S. M. A. M. S. M. (2023). Adsorption of Methylene blue onto hydrophobic activated carbon. Sultan Qaboos University Journal for Science, 28(1), 42-52. https://doi.org/10.53539/squjs.vol28iss1pp42-52
MLA 9
El-Shafey, El-Said I., and Said M. Al-Mashaikhi Said M. Al-Mashaikhi. "Adsorption of Methylene blue onto hydrophobic activated carbon." Sultan Qaboos University Journal for Science, vol. 28, no. 1, 2023, pp. 42-52. https://doi.org/10.53539/squjs.vol28iss1pp42-52.
Chicago (author–date)
El-Shafey, El-Said I., and Said M. Al-Mashaikhi Said M. Al-Mashaikhi. 2023. "Adsorption of Methylene blue onto hydrophobic activated carbon." Sultan Qaboos University Journal for Science 28 (1): 42-52. https://doi.org/10.53539/squjs.vol28iss1pp42-52.
Harvard
El-Shafey, E. S. I. and Al-Mashaikhi, S. M. A. M. S. M. (2023) 'Adsorption of Methylene blue onto hydrophobic activated carbon', Sultan Qaboos University Journal for Science, 28(1), pp. 42-52. doi:10.53539/squjs.vol28iss1pp42-52.
Vancouver
El-Shafey ESI, Al-Mashaikhi SMAMSM. Adsorption of Methylene blue onto hydrophobic activated carbon. Sultan Qaboos University Journal for Science. 2023;28(1):42-52. doi:10.53539/squjs.vol28iss1pp42-52
IEEE
E. S. I. El-Shafey, and S. M. A. M. S. M. Al-Mashaikhi, "Adsorption of Methylene blue onto hydrophobic activated carbon," Sultan Qaboos University Journal for Science, vol. 28, no. 1, pp. 42-52, 2023, doi: 10.53539/squjs.vol28iss1pp42-52.