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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 molecules.Consider the...

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...

Preparation and Reactions of Sulfides

Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.

Precipitation of Ions

Precipitation of Ions

Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:

Factors Affecting Solubility

Factors Affecting Solubility

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:

Common Ion Effect

Common Ion Effect

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:

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Related Experiment Video

Updated: Jun 5, 2026

Sulfate Separation by Selective Crystallization with a Bis-iminoguanidinium Ligand

Sulfate Separation by Selective Crystallization with a Bis-iminoguanidinium Ligand

Published on: September 8, 2016

[Adsorption performances for sulfur dioxide using imidazole ionic liquids].

Yao-Xu Tang¹, Wei-Kun Mao, Na Ma

¹College of Light Industry, Textile and Food Engineering, Sichuan University, Chengdu 610065, China. tyaoxu@tom.com

Huan Jing Ke Xue= Huanjing Kexue

|January 22, 2011

Summary

Ionic liquids effectively adsorb sulfur dioxide (SO2) from simulated flue gas. The study found 1-amyl-3-methylimidazolium chloride ([C5 mim] Cl) exhibited the highest SO2 adsorption capacity, highlighting anion influence on performance.

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Sulfate Separation by Selective Crystallization with a Bis-iminoguanidinium Ligand

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Published on: September 8, 2016

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

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Published on: March 24, 2018

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO₂ Adsorption in UiO-66 Metal-Organic Framework

Published on: February 1, 2020

Area of Science:

Chemical Engineering
Environmental Science
Materials Science

Context:

* Flue gas desulfurization is critical for reducing industrial SO2 emissions.
* Ionic liquids offer tunable properties for selective gas adsorption applications.
* Understanding SO2 adsorption behavior in ionic liquids is essential for developing efficient capture technologies.

Purpose:

* To synthesize and evaluate four ionic liquids for SO2 adsorption from simulated flue gas.
* To determine the influence of ionic liquid structure and anions on SO2 adsorption capacity.
* To explore regeneration strategies and assess the stability of ionic liquids post-adsorption.

Summary:

* Four ionic liquids, including 1-butyl-3-methylimidazolium chloride ([Bmim] Cl) and 1-amyl-3-methylimidazolium chloride ([C5 mim] Cl), were synthesized and tested for SO2 adsorption.
* [C5 mim] Cl exhibited the highest SO2 adsorption capacity (200.8 mg/g), outperforming others, with an optimal adsorption temperature of 40°C for [Bmim] Cl.
* Adsorption performance was influenced by anion type (Cl- > NO3- > BF4-) and regeneration conditions (heating, vacuum) led to a decrease in sulfur capacity and structural changes in [Bmim] Cl.

Impact:

* Identifies superior ionic liquid candidates for SO2 capture in industrial flue gas.
* Provides insights into the structure-performance relationships governing SO2 adsorption in ionic liquids.
* Highlights the challenges and potential of ionic liquid regeneration for sustainable desulfurization processes.