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Mercury Adsorption by Ca-Based Shell-Type Polymers Synthesized by Self-Assembly Mineralization.

Yang Peng1, Chuxuan Zhang2, Xiaomin Li3

  • 1School of Low-Carbon Energy and Power Engineering, China University of Mining and Technology, No. 1, Daxue Road, Xuzhou 221116, China.

Polymers
|January 8, 2025
PubMed
Summary

Mineralized Ca-based shell-type self-assembly beads (MCABs) effectively remove mercury (Hg(II)) from water. These novel beads show enhanced adsorption capacity and stability compared to unmodified materials.

Keywords:
alginate polymer templatecalcium-based adsorbentsheavy metal removalsurface modification

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemistry

Background:

  • Heavy metal contamination, particularly mercury (Hg(II)), poses significant environmental and health risks.
  • Adsorption is a key strategy for removing toxic heavy metals from aqueous solutions.
  • Development of efficient and stable adsorbents is crucial for effective remediation.

Purpose of the Study:

  • To synthesize and characterize novel mineralized Ca-based shell-type self-assembly beads (MCABs) for Hg(II) removal.
  • To investigate the adsorption performance, stability, and anti-wear properties of MCABs.
  • To elucidate the structural changes and their impact on adsorption efficiency.

Main Methods:

  • Synthesis of Ca-based spherical polymer template (CAB) followed by rate-controlled self-assembly mineralization in bicarbonate solutions.
  • Batch adsorption experiments to determine adsorption capacity at optimal conditions (pH 5, 1% bicarbonate).
  • Long-duration adsorption tests and morphological analysis (SEM, etc.) to evaluate stability and structure.

Main Results:

  • Optimal bicarbonate concentration for MCAB synthesis was determined to be 1%.
  • MCAB-1 exhibited a maximum adsorption capacity of 48 ± 4 mg/g for Hg(II), 2.67 times higher than CAB.
  • MCAB-1 demonstrated superior stability and anti-wear ability with 43.2% removal efficiency and 74.3% mass retention over 10 hours.

Conclusions:

  • Rate-controlled self-assembly mineralization effectively forms a porous amorphous carbonate layer on the alginate template.
  • This shell-type structure enhances pore structure, cation binding sites, and material durability.
  • MCABs represent a promising, stable, and efficient adsorbent for mercury removal from contaminated water.