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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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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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Crystal Field Theory - Octahedral Complexes02:58

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Electrophiles

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This lesson explains the definition, classification, and characteristic features of an electrophile that are key features of nucleophilic substitution reactions. An analysis of their charge and orbital picture helps understand their reactivity for seeking electrons. Electrophiles can be classified into positive and neutral species. Other classes include free radicals and polar functional groups.
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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Electronegative Strategic Positions in Covalent Organic Frameworks: Unlocking High-Efficiency Gold Recovery.

Zhongping Li1, Wanyi Zhao2, Changqing Li3

  • 1Ulsan National Institute of Science and Technology, Department of Energy and Chemical Engineering/Center for Dimension-Controllable Organic Frameworks,, KOREA, REPUBLIC OF.

Angewandte Chemie (International Ed. in English)
|February 27, 2025
PubMed
Summary

Researchers developed novel hexaazatriphenylene-based covalent organic frameworks (HATP-COFs) for efficient gold recovery from electronic waste. These advanced materials offer high selectivity and capacity, surpassing previous benchmarks for gold adsorption.

Keywords:
Au captureCovalent Organic FrameworksHexaazatriphenyleneelectronegative skeletonelectrostatic interaction

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Nanotechnology

Background:

  • Electronic waste (e-waste) and industrial leachates contain high concentrations of gold (Au), presenting a valuable resource.
  • Current adsorbents for gold recovery face challenges in selectivity, capacity, and adsorption kinetics due to limitations in pore wall sites.

Purpose of the Study:

  • To develop novel covalent organic frameworks (COFs) for highly selective and efficient gold recovery.
  • To investigate the potential of hexaazatriphenylene-based COFs (HATP-COFs) with an electronegative skeleton for enhanced gold adsorption.

Main Methods:

  • Synthesis of hexaazatriphenylene-based COFs (HATP-COFs) with an electronegative skeleton.
  • Characterization of HATP-COFs for structural integrity and electron-rich sites.
  • Adsorption experiments to evaluate gold capture capacity, selectivity, and kinetics.
  • Theoretical calculations to understand the mechanism of gold ion binding.

Main Results:

  • HATP-COFs exhibit an exceptional adsorption capacity exceeding 2366 mg g-1 for gold.
  • The synthesized COFs demonstrate rapid adsorption kinetics and remarkable selectivity for gold recovery.
  • Theoretical calculations confirm strong electrostatic interactions between the electronegative skeleton of HATP-COFs and Au3+ ions.

Conclusions:

  • HATP-COFs represent a highly efficient class of materials for selective gold recovery from e-waste and industrial leachates.
  • The charge-interface engineering strategy in COFs shows transformative potential for developing next-generation adsorbents.
  • The developed HATP-COFs offer a scalable, stable, and effective solution for gold recycling.