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The Halsey isotherm for water contaminant adsorption is fake


Citation

Chu, Khim Hoong and Bashiri, Hadis and Hashim, Mohd Ali and Abd Shukor, Mohd Yunus and Bollinger, Jean-Claude (2023) The Halsey isotherm for water contaminant adsorption is fake. Separation and Purification Technology, 313. art. no. 123500. pp. 1-8. ISSN 1383-5866; ESSN: 1873-3794

Abstract

We present a critique of the Halsey isotherm model (also known as Frenkel–Halsey–Hill), which is used by many researchers to interpret water contaminant adsorption data. We first convert the original Halsey isotherm for gasphase adsorption to a form appropriate for liquid-phase adsorption. We call this version the “genuine Halsey isotherm.” We then show that the Halsey isotherm currently used in water contaminant adsorption research bears only a partial resemblance to the genuine Halsey isotherm. As such, we label the former the “fake Halsey isotherm.” We go on to prove that the fake Halsey isotherm is mathematically equivalent to the Freundlich isotherm. Consequently, the modeling results obtained by the fake Halsey isotherm reported in numerous previously published studies have been mostly misleading. Many such reports can be found across a broad spectrum of major journals. Finally, we highlight the data-fitting attributes of the genuine Halsey isotherm. It is shown to be capable of describing adsorption isotherms having types I, II, and III curve shapes.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Biotechnology and Biomolecular Sciences
DOI Number: https://doi.org/10.1016/j.seppur.2023.123500
Publisher: Elsevier
Keywords: Frenkel–Halsey–Hill; Isotherm misuse; Sigmoid isotherm; Type I isotherm; Type II isotherm; Type III isotherm
Depositing User: Ms. Nur Faseha Mohd Kadim
Date Deposited: 19 Aug 2024 03:04
Last Modified: 19 Aug 2024 03:04
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.seppur.2023.123500
URI: http://psasir.upm.edu.my/id/eprint/109270
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