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Adsorption Isotherms II

Adsorption Isotherms II

Brunauer, Emmett, and Teller (BET) introduced a theory in 1938 that modified Langmuir's assumptions to explain multilayer physical adsorption. This theory is applicable to Type II isotherms and provides a more realistic picture of adsorption processes. The BET theory assumes a uniform solid surface with localized adsorption sites, where adsorption at one site doesn't affect adsorption at neighboring sites. This theory also allows for the possibility of additional molecules being adsorbed on top...

Adsorption Isotherms I

Adsorption Isotherms I

Adsorption isotherms are mathematical models that describe how molecules in a gas or liquid phase interact with surfaces. Two of the most common isotherm models are the Langmuir and Freundlich isotherms, which relate to Type I monolayer chemisorption. The Langmuir model is based on four key assumptions:• Adsorption cannot exceed monolayer coverage.• All surface sites are equivalent.• Molecules adsorb only at vacant sites.• There are no interactions between adsorbed...

Adsorption of Gases on Solids

Adsorption of Gases on Solids

Adsorption is a process where molecules, known as the adsorbates, accumulate on a surface, which is referred to as the adsorbent or substrate. Occurring at the solid-gas interface, this phenomenon is crucial in various scientific and industrial contexts. The reverse of adsorption is desorption.Two types of adsorptions exist: physical (physisorption) and chemical (chemisorption). Physisorption involves gas molecules held to the solid's surface by relatively weak intermolecular van der Waals...

One-Compartment Open Model for Extravascular Administration: First-Order Absorption Model

One-Compartment Open Model for Extravascular Administration: First-Order Absorption Model

The first-order absorption model for extravascular administration describes the rate at which a drug is absorbed and eliminated, following the principles of first-order kinetics. This model is vital as it provides a mathematical representation of drug behavior within the body. It also allows for the prediction and interpretation of drug absorption and elimination based on the rate of change in drug concentration over time. This model can be visualized as a plasma concentration-time profile...

Analyte Adsorption and Distribution

Analyte Adsorption and Distribution

In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...

Parameters Affecting Nonlinear Elimination: Zero-Order Input, First-Order Absorption and Two-Compartment Model

Parameters Affecting Nonlinear Elimination: Zero-Order Input, First-Order Absorption and Two-Compartment Model

Drugs administered through various routes can lead to nonlinear elimination, resulting in complex pharmacokinetic behaviors crucial to understanding efficacious drug dosing.
When a drug is administered through a constant intravenous infusion and eliminated via nonlinear pharmacokinetics, it follows zero-order input. For example, oral drugs undergo first-order absorption upon administration and are eliminated through nonlinear pharmacokinetics.
In the case of subcutaneously administered drugs,...

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Related Experiment Video

Updated: May 6, 2026

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

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Using of "pseudo-second-order model" in adsorption.

¹Water Research Centre, Asia University, Taichung, 41354, Taiwan, ysho@asia.edu.tw.

Environmental Science and Pollution Research International

|October 18, 2013

Summary

Researchers frequently misquote kinetic models, citing secondary sources instead of original papers. This comment corrects errors in pseudo-second-order models and emphasizes citing original research for accuracy.

Area of Science:

Environmental Science
Chemical Engineering

Background:

Citation errors and quotation mistakes are prevalent in scientific publications, leading to the propagation of incorrect information.
Researchers often rely on secondary references, inadvertently overlooking the original source of scientific concepts and models.

Discussion:

This comment identifies specific errors in the pseudo-second-order models presented by Sulaymon et al. and Spiridon et al. in Environmental Science and Pollution Research.
The discussion highlights the importance of accurately citing the original pseudo-second-order kinetic expression to ensure the integrity of scientific research.

Key Insights:

Incorrect application of pseudo-second-order models can lead to flawed research outcomes.
Accurate citation practices are crucial for maintaining the continuity and reliability of scientific knowledge.

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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

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The original pseudo-second-order kinetic model offers greater accuracy and detailed insights.

Outlook:

Promoting correct citation of foundational kinetic models is essential to prevent the widespread dissemination of scientific errors.
Encouraging researchers to consult original publications will enhance the quality and reproducibility of environmental science studies.