The DOI matches its Crossref record; 9 of the 9 references it cites were found in a registry or an index.
THE UNIT PROBLEM IN THE THERMODYNAMIC CALCULATION OF ADSORPTION USING THE LANGMUIR EQUATION
Abstract
The equilibrium constant K in the Langmuir isotherm is usually used to calculate the standard Gibbs free energy of adsorption (ΔG°). However, in a strictly theoretical sense, this calculation method is incorrect. The reason is that the K in the Langmuir isotherm has a dimension. According to the provisions of the International Union of Pure and Applied Chemistry (IUPAC), the standard equilibrium constant (K°) for calculating ΔG° must be a dimensionless parameter. We examined four examples from the literature and found that the calculation of ΔG° presented in these four references was incorrect. Based on the fact that this misapplication is very common, this note reviews the related literature and gives a short comment on this problem. Two methods for calculating the thermodynamic equilibrium constant by the Langmuir equation are provided and discussed.
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Is the Free Energy Change of Adsorption Correctly Calculated?
Liu, Y. (2009) · Journal of Chemical & Engineering Data · doi:10.1021/je800661q · Cited by 1,192
Removal of methylene blue from colored effluents by adsorption on montmorillonite clay
Almeida, C. A. P., Debacher, N. A., Downs, A. J., Cottet, L., & Mello, C. A. D. (2009) · Journal of Colloid and Interface Science · doi:10.1016/j.jcis.2008.12.012 · Cited by 736
Kinetics and thermodynamic study of phosphate adsorption on iron hydroxide-eggshell waste
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Adsorption mechanism of synthetic reactive dye wastewater by chitosan
Sakkayawong, N., Thiravetyan, P., & Nakbanpote, W. (2005) · Journal of Colloid and Interface Science · doi:10.1016/j.jcis.2005.01.020 · Cited by 332
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Adsorption and thermodynamic studies of Cu(II) and Zn(II) on organofunctionalized-kaolinite
Guerra, D. L., Airoldi, C., & de Sousa, K. S. (2008) · Applied Surface Science · doi:10.1016/j.apsusc.2008.02.017 · Cited by 42
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Are the thermodynamic parameters correctly estimated in liquid-phase adsorption phenomena?
Anastopoulos, I., & Kyzas, G. Z. (2016) · Journal of Molecular Liquids · doi:10.1016/j.molliq.2016.02.059 · Cited by 328
Lee, H., Shim, E., Yun, H.-S., Park, Y.-T., Kim, D., Ji, M.-K., Kim, C.-K., Shin, W.-S., & Choi, J. (2016) · Environmental Science and Pollution Research · doi:10.1007/s11356-015-4609-1 · Cited by 33
Metadata
- Authors
- Zhou, X., & Zhou, X.
- Venue
- Chemical Engineering Communications
- Publisher
- Informa UK Limited
- Published
- 2014-06-06
- Volume
- 201
- Issue
- 11
- Pages
- 1459-1467
- ISSN
- 0098-6445 (ISSN-L)
- 1563-5201
- OpenAlex
- W2033705851
- Cited by
- 375
- References
- 9
- FWCI
- 5.17
- Type
- journal article
- Language
- en
- Open access
- closed
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- Zhou, X., & Zhou, X. (2014). THE UNIT PROBLEM IN THE THERMODYNAMIC CALCULATION OF ADSORPTION USING THE LANGMUIR EQUATION. Chemical Engineering Communications. https://doi.org/10.1080/00986445.2013.818541
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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