Carbon-Based Fluorescent Nanomaterials (CDs) from Salak Peel Waste through Bottom Up (Microwave-Assisted) Synthesis: UV-Vis and Photoluminescence Spectroscopic Studies for Simple Detection of Fe(III) Ions
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Isriyanti Affifah
Department of Chemistry Education, Universitas Sultan Ageng Tirtayasa, Serang, Indonesia
Rahmat Firman Septiyanto
Department of Physics Education, Universitas Sultan Ageng Tirtayasa, Serang, Indonesia
Yuvita Oktarisa
Department of Physics Education, Universitas Sultan Ageng Tirtayasa, Serang, Indonesia
Asep Saepullah
Department of Physics Education, Universitas Sultan Ageng Tirtayasa, Serang, Indonesia
Rifdah Hanifah
Department of Medicine, Universitas Sultan Ageng Tirtayasa, Serang, Indonesia
Ai Asri Fauziah
Department of Physics Education, Universitas Sultan Ageng Tirtayasa, Serang, Indonesia
Amelia Febriana
Department of Physics Education, Universitas Sultan Ageng Tirtayasa, Serang, Indonesia
DOI: https://doi.org/10.19184/cerimre.v9i1.60007
ABSTRACT
Here we report a successful synthesis of fluorescent carbon dots derived from salak (Salacca zalacca) peel waste via an eco-friendly microwave-assisted approach. The synthesis was conducted in aqueous medium at a microwave power of 450 W for only 9 minutes, demonstrating a significant reduction in energy consumption and reaction time compared to conventional hydrothermal approaches. The as-prepared CDs were characterized by UV-Vis absorption spectroscopy and Fourier-transform infrared (FTIR) spectroscopy. The UV-Vis spectroscopy revealed characteristic absorption peaks at 206 nm and 285 nm, attributed to π→π* transitions of aromatic C=C bonds and n→π* transitions of C=O groups, respectively, and FTIR analysis confirmed the presence of hydroxyl, carbonyl, and carboxyl functional groups on the CD surface. Photoluminescence (PL) spectroscopy used in Fe(III) sensing showing the fluorescence intensity of the CDs decreased significantly in the presence of Fe(III) ions. The CDs exhibited strong and selective fluorescence quenching in the presence of Fe(III) ions 1 μM . These findings highlight the potential of salak peel waste as a low-cost, eco-friendly precursor for the fabrication of functional nanomaterials with promising application in fluorometric heavy metal ion sensing.
Keywords: Carbon dots, salak peel, microwave synthesis, Fe(III) detection
Published
31-05-2026
Issue
Vol. 9 No. 1 2026: CERiMRE Journal
Pages
34-46
License
Copyright (c) 2026 CERiMRE Journal
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