Groundnut shell carbon quantum dot magnetic iron oxide nanocomposite (GSCQD-FeFe2O4) for lead removal from water

Fredrick Saah; Garima Nagpal; Flomo  Gbawoquiyq; Rashi Chaudhary

doi:10.62638/ZasMat1185

Authors

Fredrick Saah Sharda School of Basic Sciences & Research, Department of Environmental Sciences, Sharda University, Greater Noida, Uttar Pradesh, India Author https://orcid.org/0009-0002-4471-4198
Garima Nagpal Sharda School of Basic Sciences & Research, Department of Environmental Sciences, Sharda University, Greater Noida, Uttar Pradesh, India Author https://orcid.org/0000-0002-5182-8233
Flomo Gbawoquiyq Sharda School of Basic Sciences & Research, Department of Environmental Sciences, Sharda University, Greater Noida, Uttar Pradesh, India Author
Rashi Chaudhary Sharda School of Basic Sciences & Research, Department of Life Sciences, Sharda University, Greater Noida, Uttar Pradesh, India Author

DOI:

https://doi.org/10.62638/ZasMat1185

Abstract

A novel adsorbent, GSCQD-FeFe₂O₄, combining groundnut shell-derived carbon quantum dots with magnetic iron oxide nanoparticles, was synthesized for efficient removal of Pb(II) from water. Characterization studies confirmed successful synthesis, with UV analysis showing absorption at 210 nm and green luminescence indicating carbon quantum dots. FT-IR identified characteristic functional groups, while XRD confirmed well-ordered structures. FE-SEM revealed clustered carbon nanoparticles with magnetic iron oxide, and TEM showed small-sized carbon dots suitable for adsorption. Batch adsorption studies revealed optimal conditions for Pb(II) removal, including a pH range of 5-6, temperature of 20°C, contact time of 20 minutes, and adsorbent dose of 0.2 g. Isotherm studies indicated that both Langmuir and Freundlich models provided a good fit, with a calculated adsorption capacity of 37.8 mg/g. Thermodynamic analysis suggested spontaneous, exothermic adsorption with increased disorder. GSCQD-FeFe₂O₄displayed excellent potential for Pb(II) removal, but further research on reusability and stability in industrial settings is needed for broader applicability.

Keywords:

carbon quantum dots, groundnut shell, magnetic iron oxide nanoparticle, lead, adsorption capacity, thermodynamic parameters, thermodynamic isotherms

Supporting Agencies

We thank Dr. Garima Nagpal for her unwavering support and guidance in shaping our study. Gratitude to Sharda University's Central of Instrumentation and Facility for aiding absorbance readings. Special thanks to all contributors for their dedication and collaborative efforts, crucial to the success of this research.

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