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Ion-Exchange Chromatography01:09

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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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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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High Performance of Ionic-Liquid-Based Materials to Remove Insecticides.

Rafael Francisco1, Catarina Almeida1, Ana C A Sousa2,3

  • 1CICECO-Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal.

International Journal of Molecular Sciences
|March 25, 2022
PubMed
Summary
This summary is machine-generated.

New silica-based ionic liquid materials efficiently remove neonicotinoid insecticides from water. These supported ionic liquids (SILs) offer a rapid and effective solution for environmental remediation, protecting ecosystems and human health.

Keywords:
acetamipridadsorptionimidaclopridneonicotinoidsremovalsupported ionic liquidsthiaclopridthiamethoxam

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Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Green Chemistry

Background:

  • Neonicotinoid insecticides (neonics) are widely used in agriculture and veterinary applications.
  • Their presence in water, soils, and biota raises significant concerns due to high toxicity to non-target organisms.
  • Developing effective removal strategies for neonics is crucial to prevent environmental contamination.

Purpose of the Study:

  • To explore ionic-liquid-based materials as adsorbents for removing four common neonicotinoid insecticides from aqueous media.
  • To synthesize and characterize silica-supported ionic liquids (SILs) for neonicotinoid adsorption.
  • To evaluate the adsorption efficiency, kinetics, and capacity of SILs compared to activated carbon.

Main Methods:

  • Synthesis and chemical characterization of silica-supported ionic liquids (SILs) with varying tetraalkylammonium cation chain lengths.
  • Adsorption studies to determine the effect of SIL cation chain length on neonicotinoid removal.
  • Kinetic and isotherm modeling (Pseudo Second-Order and Freundlich models) to understand adsorption mechanisms.
  • Evaluation of continuous removal efficiency using solid-phase extraction and calculation of adsorption capacity.

Main Results:

  • The best-performing SIL, silica modified with propyltrioctylammonium chloride ([Si][N3888]Cl), demonstrated rapid adsorption, reaching saturation in 5 minutes or less.
  • Adsorption capacity was influenced by hydrophobic interactions, with shorter alkyl chains on the SIL cation showing decreased adsorption.
  • The Pseudo Second-Order model best described the kinetics, indicating solid-liquid interface control, while the Freundlich model suggested multilayer adsorption.
  • One gram of [Si][N3888]Cl can treat at least 106 m³ of contaminated water under ideal conditions.

Conclusions:

  • Supported ionic liquids (SILs) are highly effective and fast-acting adsorbents for a diverse range of neonicotinoid insecticides.
  • The [Si][N3888]Cl material shows significant potential for removing neonics from contaminated water, offering a sustainable environmental remediation solution.
  • These findings contribute to reducing the detrimental environmental and health impacts of neonicotinoid pollution.