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Related Concept Videos

Extraction: Advanced Methods00:56

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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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Oxymercuration-Reduction of Alkenes02:36

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Oxymercuration–reduction of alkenes is one of the major reactions converting alkenes to alcohols. It involves the hydration of alkenes with mercuric acetate in a mixture of tetrahydrofuran and water, forming an organomercury adduct. This is followed by a demercuration step in which the adduct is reduced to an alcohol using sodium borohydride.
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Updated: Nov 16, 2025

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3D Thioether-Based Covalent Organic Frameworks for Selective and Efficient Mercury Removal.

Yiying Zhang1, Hui Li1, Jianhong Chang1

  • 1State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun, 130012, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|February 19, 2021
PubMed
Summary

New 3D thioether-based covalent organic frameworks (COFs) effectively remove mercury (Hg2+) from water. These stable COFs show high adsorption capacity and selectivity, offering promising environmental remediation solutions.

Keywords:
covalent organic frameworksmercury removalselective adsorptionthioether functionalization

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Nanotechnology

Background:

  • Developing functionalized 3D covalent organic frameworks (COFs) is crucial for expanding their applications.
  • Introducing specific functionalities into 3D COFs is challenging due to the incompatibility of many functional groups with synthesis conditions.

Purpose of the Study:

  • To report the first synthesis of 3D thioether-based COFs (JUC-570 and JUC-571) for mercury (Hg2+) removal.
  • To evaluate the Hg2+ adsorption performance, kinetics, selectivity, and stability of these novel COFs.

Main Methods:

  • Bottom-up synthesis approach to create 3D thioether-based COFs.
  • Characterization of COF structure and properties.
  • Mercury ion adsorption experiments in aqueous solutions at various pH levels.
  • Evaluation of adsorption capacity, kinetics, selectivity, and cycling stability.

Main Results:

  • Synthesized JUC-570 and JUC-571 exhibit high Hg2+ uptakes (972 and 970 mg g-1, respectively) at pH 5.
  • Fast adsorption kinetics with high distribution coefficient (Kd) values (2.29 × 107 and 2.07 × 107 mL g-1).
  • JUC-570 demonstrates remarkable chemical stability and high Hg2+ adsorption capacity (619 mg g-1) even at pH 1, with excellent reusability.

Conclusions:

  • This study presents a novel route for constructing stable, functionalized 3D COFs.
  • The developed thioether-based COFs show significant potential for efficient and selective mercury removal from aqueous environments.
  • The findings advance the application of advanced porous materials in environmental remediation.