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Efficient mercury(II) removal by corn bract/dopamine@ZnS composites.

Xiaoxu Xu1, Chengyue Yang2, Qihui Guo2

  • 1College of Chemical Engineering and Machinery, Eastern Liaoning University, Dandong, 118001, People's Republic of China.

Environmental Science and Pollution Research International
|August 14, 2023
PubMed
Summary

A novel corn bract/polydopamine@zinc sulfide composite efficiently removes mercury ions (Hg(II)) from water. This sustainable adsorbent shows high capacity, excellent selectivity, and good reusability for mercury removal applications.

Keywords:
Adsorption mechanismsCorn bractMercury ionZinc sulfide

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Area of Science:

  • Materials Science
  • Environmental Science
  • Chemistry

Background:

  • Mercury ions (Hg(II)) pose significant environmental and health risks.
  • Agricultural by-products offer sustainable precursors for adsorbent materials.
  • Developing efficient and selective adsorbents for mercury removal is crucial.

Purpose of the Study:

  • To synthesize and characterize a novel composite material for mercury ion removal.
  • To investigate the adsorption performance and mechanism of the composite for Hg(II).
  • To evaluate the adsorbent's efficiency in real industrial wastewater.

Main Methods:

  • Synthesis of corn bract/polydopamine@zinc sulfide (CB/PDA@ZnS) composite.
  • Characterization using FT-IR, TGA, XRD, and SEM.
  • Adsorption experiments to determine optimal conditions and kinetics (pH, dosage, concentration, time, temperature).

Main Results:

  • CB/PDA@ZnS achieved high Hg(II) uptake (333.03 mg/g) and removal efficiency (99.91%).
  • Adsorption followed pseudo-second-order kinetics and Langmuir isotherm models.
  • The adsorbent demonstrated excellent selectivity, stability, and regeneration performance over five cycles.

Conclusions:

  • CB/PDA@ZnS is a highly efficient and reusable adsorbent for Hg(II) removal from aqueous solutions.
  • The composite shows promise for treating industrial wastewater contaminated with mercury.
  • This study highlights the potential of agricultural waste in developing advanced environmental remediation materials.