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Related Concept Videos

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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Ion Exchange01:17

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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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Related Experiment Video

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Thioether-functionalized porphyrin-based polymers for Hg2+ efficient removal in aqueous solution.

Lizhi Wang1, Jiajia Wang1, You Wang1

  • 1College of Chemistry and Chemical Engineering, Hunan Provincial Key Laboratory of Micro and Nano Material Interface, Central South University, Changsha 410083, China.

Journal of Hazardous Materials
|February 1, 2022
PubMed
Summary

The "bottom-up" synthesis of thioether-functionalized porphyrin-based polymers (TPPs) yielded superior mercury (Hg2+) capture (913 mg/g) compared to "top-down" methods. This highlights the advantage of the bottom-up strategy for creating effective TPPs for heavy metal removal.

Keywords:
Hg(2+) removalPorphyrinsThioether-functionalized polymers“bottom-up” strategy

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Polymer Chemistry

Background:

  • Thioether-functionalized porphyrin-based polymers (TPPs) are promising materials for heavy metal remediation.
  • Developing efficient synthesis strategies is crucial for optimizing TPP performance in mercury (Hg2+) capture.

Purpose of the Study:

  • To compare the effectiveness of
  • bottom-up
  • and
  • top-down
  • synthesis strategies for constructing TPPs for Hg2+ capture.
  • To elucidate the adsorption mechanism of Hg2+ onto TPPs.

Main Methods:

  • Synthesized TPPs using a one-step polycondensation (
  • bottom-up
  • ) and post-functionalization (
  • top-down
  • ) approach.
  • Characterized TPPs using Brunauer-Emmett-Teller (BET) analysis for surface area (SBET) and pore volume (Vtotal).
  • Quantified Hg2+ capture capacity and removal efficiency in aqueous solutions.

Main Results:

  • The
  • bottom-up
  • synthesized TPP (TPP1) exhibited high SBET (554 m2/g), Vtotal (0.32 cm3/g), and sulfur (S) content (16.8%).
  • TPP1 demonstrated exceptional Hg2+ capture (913 mg/g) with >99% removal efficiency, attributed to strong S-Hg2+ coordination.
  • The
  • top-down
  • synthesized TPPs (TPP2, TPP3) showed lower performance due to pore blockage and incomplete functionalization.

Conclusions:

  • The
  • bottom-up
  • strategy is advantageous for constructing high-performance TPPs for Hg2+ capture.
  • This study provides guidance for designing other thioether-functionalized polymers for environmental applications.