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MgO Nanoparticles as a Promising Photocatalyst towards Rhodamine B and Rhodamine 6G Degradation.

Maria-Anna Gatou1, Natalia Bovali1, Nefeli Lagopati2,3

  • 1Laboratory of General Chemistry, School of Chemical Engineering, National Technical University of Athens, Zografou Campus, 15772 Athens, Greece.

Molecules (Basel, Switzerland)
|September 28, 2024
PubMed
Summary
This summary is machine-generated.

Magnesium oxide nanoparticles effectively degrade rhodamine B dye under UV and visible light. This reusable catalyst shows promise for wastewater treatment, with hydroxyl radicals driving the process.

Keywords:
MgOorganic dyesphotocatalysisphotocatalysis mechanismphotocatalyst selectivityprecipitation approachreusabilityrhodamine 6Grhodamine Bscavengers

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Nanotechnology

Background:

  • Growing global demand for clean water necessitates advanced wastewater treatment methods.
  • Organic dyes like rhodamine B and 6G are significant water pollutants.
  • Efficient and selective catalysts are crucial for dye degradation.

Purpose of the Study:

  • Synthesize and characterize magnesium oxide (MgO) nanoparticles.
  • Evaluate the photocatalytic efficiency of MgO for rhodamine B and 6G degradation.
  • Investigate the catalyst's reusability and degradation mechanism.

Main Methods:

  • Precipitation synthesis of MgO nanoparticles.
  • Characterization using XRD, FT-IR, XPS, TGA, DLS, and FESEM.
  • Photocatalytic degradation experiments under UV and visible light.

Main Results:

  • Synthesized MgO nanoparticles exhibit a face-centered cubic structure, high crystallinity, and a crystallite size of ~3.20 nm.
  • MgO nanoparticles show a BET surface area of 52 m²/g and a bandgap of 5.27 eV.
  • Complete degradation of rhodamine B under UV light (180 min) and 83.23% under visible light; 92.62% degradation of rhodamine 6G under UV light.

Conclusions:

  • MgO nanoparticles are effective photocatalysts for rhodamine B degradation, demonstrating selectivity.
  • The catalyst is reusable for multiple degradation cycles with promising results.
  • Hydroxyl radicals (•OH) are identified as the primary reactive species in the photodegradation mechanism.