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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

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Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Factors Influencing Drug Absorption: Physicochemical Parameters01:22

Factors Influencing Drug Absorption: Physicochemical Parameters

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The physicochemical characteristics of drugs play a crucial role in formulating stable and bioavailable drug products. The solubility of a drug, governed by the varying pH along the GI tract and its dissociation constant (pKa), is pivotal in determining its ionization state and absorption rate. Notably, weak acids and bases remain unionized and are absorbed more rapidly.
Enhanced drug absorption can be achieved by reducing particle sizes and increasing surface areas, thereby facilitating...
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Mineral, Vitamin and Water Absorption01:27

Mineral, Vitamin and Water Absorption

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Electrolytes are essential minerals and ions primarily obtained from the diet and absorbed through the gastrointestinal tract. Most electrolytes are absorbed in the small intestine. While the absorption of iron and calcium primarily occurs in the duodenum, calcium is also absorbed in the jejunum and ileum. In these regions, passive diffusion contributes to its absorption alongside active transport mechanisms in the duodenum. These ions can exit the enterocytes through specialized active...
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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Related Experiment Video

Updated: Nov 29, 2025

Development, Characterization, and Evaluation of CAGE-based Ionic Liquid Systems for Transdermal Delivery
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Development, Characterization, and Evaluation of CAGE-based Ionic Liquid Systems for Transdermal Delivery

Published on: September 26, 2025

199

NOx absorption and conversion by ionic liquids.

Jiajia Liu1, Yingjie Xu1

  • 1College of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing 312000, China.

Journal of Hazardous Materials
|November 21, 2020
PubMed
Summary
This summary is machine-generated.

Ionic liquids (ILs) efficiently absorb nitrogen oxides (NOx) and catalyze their conversion. Functionalized ILs enhance NOx capacity, while nitrate-based ILs show superior performance in NO conversion to nitric acid.

Keywords:
AbsorptionConversionIonic liquids (ILs)NO(x)

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Area of Science:

  • Green Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Ionic liquids (ILs) offer a sustainable alternative for NOx management due to their low toxicity and reusability.
  • Conventional ILs primarily exhibit physical absorption of NOx, with varying capacities based on the specific NOx species.
  • Understanding the absorption mechanisms and influencing factors is crucial for optimizing NOx capture and conversion processes.

Purpose of the Study:

  • To present the capacity and absorption mechanisms of NOx by various ionic liquids.
  • To explore strategies for enhancing NOx absorption capacity using functionalized ILs.
  • To investigate the catalytic potential of ILs for NO conversion into nitric acid.

Main Methods:

  • Review and analysis of existing literature on NOx absorption and conversion by ILs.
  • Investigation of physical absorption mechanisms in conventional ILs (e.g., imidazolium-based).
  • Evaluation of functionalized ILs incorporating metal-containing anions, amine groups, sulfonates, and carboxylates.

Main Results:

  • NOx absorption capacity follows the order NO2 > NO > N2O, correlating with binding energies.
  • Low temperature, high pressure, and large cation volume favor NOx absorption.
  • Functionalized ILs with active N or O sites significantly enhance NOx capacity by reacting with N2O2.
  • Electron-withdrawing substituents reduce desorption residue in functionalized ILs.
  • Nitrate-based ILs demonstrate superior catalytic activity for NO conversion to HNO3 compared to other anions, owing to the strong oxidation capability of [NO3]-.
  • Low temperature and high O2 content further improve NO conversion efficiency.

Conclusions:

  • Ionic liquids are effective and reusable media for NOx absorption and conversion.
  • Functionalization of ILs provides a viable route to enhance NOx capture efficiency.
  • Nitrate-based ILs show promise for catalytic conversion of NO to nitric acid, offering a greener alternative.