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Boyd's film diffusion model for water contaminant adsorption: Time for an upgrade?

The Boyd film diffusion model is widely used in liquid phase adsorption studies for its mathematical simplicity and straightforward data analysis. However, a lack of awareness regarding its restrictive assumptions has led to widespread misuse. The Boyd model assumes film diffusion as the rate-contro...

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Main Authors: Chu K.H., Hashim M.A., Hayder G.
Other Authors: 7402453718
Format: Article
Published: Elsevier B.V. 2025
Subjects:
Adsorption
Diffusion
Kinetics
Water pollution
Batch adsorption
Biot number
Chen's model
Diffusion model
Film diffusion
Furusawum?smith model
Orthogonal distance regression
Rectangular isotherm
Smith model
Yao?chen model
Isotherms
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spelling my.uniten.dspace-364282025-03-03T15:42:23Z Boyd's film diffusion model for water contaminant adsorption: Time for an upgrade? Chu K.H. Hashim M.A. Hayder G. 7402453718 7005780117 56239664100 Adsorption Diffusion Kinetics Water pollution Batch adsorption Biot number Chen's model Diffusion model Film diffusion Furusawum?smith model Orthogonal distance regression Rectangular isotherm Smith model Yao?chen model Isotherms The Boyd film diffusion model is widely used in liquid phase adsorption studies for its mathematical simplicity and straightforward data analysis. However, a lack of awareness regarding its restrictive assumptions has led to widespread misuse. The Boyd model assumes film diffusion as the rate-controlling mechanism and rests on two additional pivotal assumptions: adsorption occurs under infinite bath conditions and follows a linear equilibrium relationship. This study examines the recurrent breaches of these assumptions across a growing body of research on water contaminant adsorption. Nearly all kinetic data have been derived from finite bath experiments governed by nonlinear isotherms, which directly contradict the Boyd model's assumptions. Consequently, applying the Boyd model to such data can yield misleading results and interpretations. To address these challenges, alternative models tailored for finite bath conditions and capable of accommodating both linear and nonlinear isotherms should be considered. These models offer more accurate insights into adsorption kinetics under realistic experimental settings. While the Boyd model remains valuable under specific conditions, its stringent assumptions restrict its broader applicability. Researchers should critically assess the validity of these assumptions and explore alternative models when analyzing liquid phase adsorption kinetics to ensure robust and reliable results. ? 2024 Elsevier B.V. Final 2025-03-03T07:42:23Z 2025-03-03T07:42:23Z 2024 Article 10.1016/j.molliq.2024.125466 2-s2.0-85198136255 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85198136255&doi=10.1016%2fj.molliq.2024.125466&partnerID=40&md5=63d5c55f60e6e6d478ea2bf5f8f9fedc https://irepository.uniten.edu.my/handle/123456789/36428 409 125466 Elsevier B.V. Scopus
institution Universiti Tenaga Nasional
building UNITEN Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Tenaga Nasional
content_source UNITEN Institutional Repository
url_provider http://dspace.uniten.edu.my/
topic Adsorption
Diffusion
Kinetics
Water pollution
Batch adsorption
Biot number
Chen's model
Diffusion model
Film diffusion
Furusawum?smith model
Orthogonal distance regression
Rectangular isotherm
Smith model
Yao?chen model
Isotherms
spellingShingle Adsorption
Diffusion
Kinetics
Water pollution
Batch adsorption
Biot number
Chen's model
Diffusion model
Film diffusion
Furusawum?smith model
Orthogonal distance regression
Rectangular isotherm
Smith model
Yao?chen model
Isotherms
Chu K.H.
Hashim M.A.
Hayder G.
Boyd's film diffusion model for water contaminant adsorption: Time for an upgrade?
description The Boyd film diffusion model is widely used in liquid phase adsorption studies for its mathematical simplicity and straightforward data analysis. However, a lack of awareness regarding its restrictive assumptions has led to widespread misuse. The Boyd model assumes film diffusion as the rate-controlling mechanism and rests on two additional pivotal assumptions: adsorption occurs under infinite bath conditions and follows a linear equilibrium relationship. This study examines the recurrent breaches of these assumptions across a growing body of research on water contaminant adsorption. Nearly all kinetic data have been derived from finite bath experiments governed by nonlinear isotherms, which directly contradict the Boyd model's assumptions. Consequently, applying the Boyd model to such data can yield misleading results and interpretations. To address these challenges, alternative models tailored for finite bath conditions and capable of accommodating both linear and nonlinear isotherms should be considered. These models offer more accurate insights into adsorption kinetics under realistic experimental settings. While the Boyd model remains valuable under specific conditions, its stringent assumptions restrict its broader applicability. Researchers should critically assess the validity of these assumptions and explore alternative models when analyzing liquid phase adsorption kinetics to ensure robust and reliable results. ? 2024 Elsevier B.V.
author2 7402453718
author_facet 7402453718
Chu K.H.
Hashim M.A.
Hayder G.
format Article
author Chu K.H.
Hashim M.A.
Hayder G.
author_sort Chu K.H.
title Boyd's film diffusion model for water contaminant adsorption: Time for an upgrade?
title_short Boyd's film diffusion model for water contaminant adsorption: Time for an upgrade?
title_full Boyd's film diffusion model for water contaminant adsorption: Time for an upgrade?
title_fullStr Boyd's film diffusion model for water contaminant adsorption: Time for an upgrade?
title_full_unstemmed Boyd's film diffusion model for water contaminant adsorption: Time for an upgrade?
title_sort boyd's film diffusion model for water contaminant adsorption: time for an upgrade?
publisher Elsevier B.V.
publishDate 2025
_version_ 1825816272171958272
score 13.244413

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