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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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Clew-like Cu2O/CuO Microsphere Adsorbents for Highly Efficient Anionic Dye Removal.

Shuyu Wang1, Xiaohui Wu2, Lijuan Ren3

  • 1Cancer Molecular Diagnostics Core, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, State Key Laboratory of Druggability Evaluation and Systematic Translational Medicine, Tianjin's Clinical Research Center for Cancer, Key Laboratory of Cancer Immunology and Biotherapy, Tianjin 300060, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 21, 2025
PubMed
Summary

Newly synthesized copper oxide (Cu₂O/CuO) microspheres efficiently remove anionic dyes like methyl orange from water. These novel adsorbents exhibit a high adsorption capacity, offering a promising solution for dye pollutant removal.

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Nanotechnology

Background:

  • Dye pollutant removal is critical for environmental remediation.
  • Developing adsorbents with high selectivity and capacity is essential.
  • Metal oxide nanomaterials show promise for adsorptive dye removal.

Purpose of the Study:

  • To synthesize novel clew-like Cu₂O/CuO microspheres.
  • To investigate their selective adsorption capabilities for dye pollutants.
  • To evaluate their adsorption performance and mechanism for methyl orange.

Main Methods:

  • Facile low-temperature solvothermal synthesis using cupric acetate monohydrate and ethylene glycol.
  • Selective adsorption tests with anionic (methyl orange, Reactive Red 2) and cationic (methylene blue, Rhodamine B) dyes.
  • Adsorption isotherm and kinetic studies using Langmuir and pseudo-second-order models.

Main Results:

  • Synthesized Cu₂O/CuO microspheres demonstrated high selectivity for anionic dyes over cationic dyes.
  • Maximum adsorption capacity for methyl orange reached 826.45 mg/g, surpassing existing metal oxide adsorbents.
  • Adsorption behavior followed Langmuir isotherm and pseudo-second-order kinetics.

Conclusions:

  • Clew-like Cu₂O/CuO microspheres are effective adsorbents for anionic dye removal.
  • Synergistic effects including electrostatic attraction, hierarchical structure, and crystal defects contribute to high adsorption capacity.
  • This work offers insights into designing high-performance adsorbents for environmental applications.