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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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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

1.8K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.1K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

3.0K
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...
3.0K
Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

4.1K
Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Related Experiment Video

Updated: May 2, 2026

A Freeze-Thawing Method to Prepare Chitosan-Polyvinyl alcohol Hydrogels Without Crosslinking Agents and Diflunisal Release Studies
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A Freeze-Thawing Method to Prepare Chitosan-Polyvinyl alcohol Hydrogels Without Crosslinking Agents and Diflunisal Release Studies

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Removing Cr(VI) from aqueous solutions using a functional ionic liquid-based cross-linked polymer.

Hejun Gao1, Yun Wang2, Liqiang Zheng3

  • 1Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, China; Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, China West Normal University, Nanchong 637000, China.

Journal of Environmental Management
|March 8, 2014
PubMed
Summary

A new ionic liquid-based polymer efficiently removes Cr(VI) with high adsorption capacity. This functional polymer shows promise as an effective adsorbent for environmental remediation applications.

Keywords:
AdsorptionCr(VI)Ionic liquidsPolymers

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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Nanosponge Tunability in Size and Crosslinking Density
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Area of Science:

  • Polymer Chemistry
  • Environmental Science
  • Materials Science

Background:

  • Ionic liquids offer unique properties for material synthesis.
  • Developing efficient adsorbents for heavy metal removal is crucial for environmental protection.
  • Cross-linked polymers provide stable matrices for functional materials.

Purpose of the Study:

  • To synthesize a novel functional ionic liquid-based cross-linked polymer.
  • To investigate the physicochemical properties and Cr(VI) adsorption performance of the synthesized polymer.
  • To explore the adsorption kinetics, thermodynamics, and mechanism.

Main Methods:

  • Synthesis of the ionic liquid-based cross-linked polymer using 1-aminoethyl-3-vinylimidazolium chloride hydrochloride and divinylbenzene.
  • Characterization using scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and Fourier transform infrared spectroscopy (FTIR).
  • Batch adsorption experiments to determine adsorption capacity, kinetics, and isotherms.

Main Results:

  • The polymer exhibited excellent physicochemical properties confirmed by SEM, TGA, and FTIR.
  • High adsorption capacity for Cr(VI) was achieved, with a maximum of 391.4 mg/g in 5 minutes at 25 °C.
  • Adsorption followed pseudo-second-order kinetics and Langmuir isotherm models, indicating electrostatic interactions.

Conclusions:

  • The synthesized ionic liquid-based cross-linked polymer is a highly efficient adsorbent for Cr(VI).
  • The material demonstrates superior performance compared to many previously reported adsorbents.
  • This functional polymer represents a novel and effective adsorbent for environmental remediation.