The Halsey isotherm for water contaminant adsorption is fake
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...
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| Main Authors: | , , , , |
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| Format: | Article |
| Published: |
Elsevier
2023
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| Online Access: | http://psasir.upm.edu.my/id/eprint/109270/ https://linkinghub.elsevier.com/retrieve/pii/S1383586623004082 |
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| Summary: | 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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