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Updated: Jul 16, 2025

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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Revolutionizing fuel production through biologically synthesized zero-dimensional nanoparticles.

Yogeshwari Vyas1, Priyanka Chundawat1, Dharmendra Dharmendra1

  • 1Photochemistry Laboratory, Department of Chemistry, University College of Science, M.L. Sukhadia University Udaipur-313001 Rajasthan India chetna.ameta@yahoo.com.

Nanoscale Advances
|September 14, 2023
PubMed
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Biosynthesized carbon quantum dots (CQDs) from water caltrop peels, combined with copper selenide (CuSe), effectively degrade wastewater dyes and produce clean hydrogen fuel. This composite shows enhanced efficiency for sustainable environmental management.

Area of Science:

  • Materials Science
  • Environmental Science
  • Green Chemistry

Background:

  • Sustainable wastewater management and clean fuel production are critical for reducing carbon footprints.
  • Photocatalysis offers a promising route for pollutant degradation and hydrogen generation.
  • Biosynthesized photocatalysts, particularly carbon quantum dots (CQDs), present an eco-friendly alternative.

Purpose of the Study:

  • To biosynthesize carbon quantum dots (CQDs) from water caltrop peels.
  • To develop a composite photocatalyst (CuSe@CQDs) for enhanced pollutant degradation and hydrogen production.
  • To optimize reaction conditions and characterize the composite's performance.

Main Methods:

  • CQDs were synthesized from water caltrop peels.
  • A composite of greenly synthesized CQDs with copper selenide (CuSe) was prepared.

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  • Photocatalytic degradation of Thymol blue (TB) and Congo red (CR) dyes was studied.
  • Hydrogen production rates were measured under optimized conditions.
  • The CuSe@CQDs composite was characterized using various spectroscopic techniques (XRD, UV-Vis, FESEM, HRTEM, XPS, FTIR, BET, TGA) and GCMS analysis.

    • Main Results:

    • The CuSe@CQDs composite achieved high degradation rates: 99.4% for TB and 97.8% for CR within 60 minutes.
    • Hydrogen production rates reached 2360 μmol g⁻¹ h⁻¹ (TB) and 1875 μmol g⁻¹ h⁻¹ (CR).
    • The composite demonstrated significantly higher hydrogen yield (35.7x for TB, 29x for CR) compared to CuSe alone.
    • Degradation rates were enhanced approximately threefold compared to CuSe.

    Conclusions:

    • Biosynthesized CQDs, when composited with CuSe, form a highly efficient photocatalyst.
    • The CuSe@CQDs composite offers a sustainable solution for wastewater treatment and clean fuel generation.
    • This approach highlights the potential of using agricultural waste for advanced environmental applications.