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EDTA: Chemistry and Properties01:22

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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA 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.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Dendritic bio-inspired multidentate coordination aerogels for efficient uranium adsorption.

Wansheng Zhang1, Yangyang Xin2, Changlong Fang2

  • 1CAS Key Laboratory of Bio-Based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China.; School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.; Shandong Energy Institute, Qingdao 266101, China.; Qingdao New Energy Shandong Laboratory, Qingdao 266061, China.

Journal of Colloid and Interface Science
|December 24, 2025
PubMed
Summary

A novel aerogel adsorbent, CSPP, efficiently extracts uranium from seawater using a plant-inspired, multi-site strategy. This cost-effective material offers high capacity and selectivity, overcoming key challenges in uranium recovery.

Keywords:
AerogelsBio-inspiredMultidentate coordinationSeawaterUranium

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Chemical Engineering

Background:

  • Selective uranium extraction from seawater is crucial but hindered by competing ions, biofouling, and cost.
  • Existing adsorbents often lack the required capacity, selectivity, or stability for practical application.

Purpose of the Study:

  • To develop a cost-effective and highly efficient adsorbent for selective uranium extraction from seawater.
  • To investigate a bio-mimetic, multi-site synergistic adsorption strategy inspired by plant structures.

Main Methods:

  • Fabrication of a phosphorylated multidentate coordination aerogel (CSPP) using sodium alginate (SA) and carboxymethyl chitosan (CMC) scaffolds with dendritic molecules.
  • Evaluation of CSPP's adsorption capacity, selectivity, stability, and resistance to biofouling in natural seawater.
  • Utilizing experimental and computational simulations to elucidate the adsorption mechanism.

Main Results:

  • CSPP achieved a high uranium adsorption capacity (723.4 mg g⁻¹), significantly outperforming standalone materials.
  • Demonstrated excellent selectivity (Kd = 4.0 × 10⁴) in natural seawater, along with superior stability and biofouling resistance.
  • Identified a tetradentate chelation mechanism involving phosphate and carboxyl groups, enhanced by a crown ether.

Conclusions:

  • The developed CSPP adsorbent offers an economically viable and efficient solution for uranium recovery from seawater.
  • The bio-mimetic, multi-site synergistic adsorption strategy presents a promising blueprint for designing advanced adsorbents for valuable ion extraction.
  • This work redefines the economic feasibility of seawater uranium extraction and highlights the potential of biomimetic design.