Chu, Khim Hoong and Hashim, Mohd Ali and Debord, Jean and Harel, Michel and Bollinger, Jean-Claude (2023) A new two-parameter isotherm for modeling adsorptive removal of water contaminants. Journal of Environmental Engineering, 149 (11). ISSN 0733-9372, DOI https://doi.org/10.1061/JOEEDU.EEENG-7419.
Full text not available from this repository.Abstract
The two-parameter Elovich isotherm is increasingly being used to describe the adsorption of water contaminants on solid materials. This isotherm is derived from a modified version of Langmuir's kinetic theory for saturable adsorption. However, despite incorporating a saturation capacity parameter, the Elovich isotherm fails to predict an adsorption maximum at high concentrations. As a result, there are disparities between the estimated and observed saturation capacities. In this study, we have identified a conceptual flaw within the Elovich isotherm responsible for this anomaly. By introducing modifications to the theoretical derivation of the Elovich isotherm, we have rectified the conceptual defect. The modified isotherm retains the two parameters of the Elovich isotherm but possesses a different mathematical structure. In contrast to the Elovich isotherm, the new isotherm provides estimated saturation capacities that align closely with the observed values. A comparative analysis demonstrates the superiority of the new isotherm over the Elovich isotherm in fitting data featuring a plateau. However, the new isotherm is loading-implicit, posing challenges in data fitting. To overcome this limitation, we have developed a novel method to convert the loading-implicit isotherm into an explicit form. This conversion enables convenient data fitting and facilitates the evaluation of the site energy distribution of heterogeneous adsorbents.
| Item Type: | Article |
|---|---|
| Funders: | None |
| Uncontrolled Keywords: | Conceptual defect; Elovich isotherm; Energy distribution; Implicit isotherm |
| Subjects: | G Geography. Anthropology. Recreation > GE Environmental Sciences T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Faculty of Engineering > Department of Chemical Engineering |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 12 Oct 2025 12:56 |
| Last Modified: | 12 Oct 2025 12:56 |
| URI: | http://eprints.um.edu.my/id/eprint/48101 |
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