Comparative Study of metal-doped carbon dots and Chitosan for effective dye removal from water | ||
| البحوث التطبيقية في العلوم والانسانيات | ||
| Volume 2, Issue 1, 2025, Pages 130-141 PDF (1.27 M) | ||
| Document Type: المقالة الأصلية | ||
| DOI: 10.21608/aash.2025.459896 | ||
| Authors | ||
| Shrouk k. Ail; Shahd M. Ali; Shimaa A. Hemada; Shimaa F. Hafiz; Afaf H. Mahmoud; Ola A. . Ahmed; Soad Magdy; M. Saif | ||
| Professor of Inorganic Chemistry Ain Shams University, Faculty of Education, Program Bachelor’s in Science and Education (preparatory and secondary), Chemistry. | ||
| Abstract | ||
| This study presents a comparative analysis of metal-doped carbon dots (CDs) synthesized from banana (CDs-B) and mandarin peels (CDs-M), alongside their chitosan-based composites, for the catalytic reduction of organic dyes Remazol Red (RR) and Methyl Orange (MO) in aqueous solutions. The CDs were produced via a hydrothermal method from fruit waste that naturally contains metal ions like K, Ca, Mg, Fe, and Zn, which enhance catalytic performance by improving electron transfer and structural stability. Characterization was performed using Xray diffraction (XRD), UV–Vis spectroscopy, fluorescence emission, and Fourier-transform infrared (FTIR) spectroscopy. Kinetic studies, based on pseudo-first-order models, revealed that CDs-B outperformed CDs-M, exhibiting higher rate constants for RR (0.19954 min⁻¹ vs. 0.13429 min⁻¹) and MO (0.14934 min⁻¹ vs. 0.04201 min⁻¹). The incorporation of chitosan significantly enhanced the catalytic efficiency, with the chitosan/CDs-B composite achieving the highest rate constant of 0.34376 min⁻¹ for RR reduction and showing the fastest reduction times (3 minutes for RR and 15 minutes for MO). These results suggest that banana peel-derived CDs, particularly when combined with chitosan, form a promising and sustainable nanocatalyst system for efficient dye remediation and wastewater treatment. | ||
| Keywords | ||
| Carbon dots; Chitosan; Dye degradation; Water purification; green synthesis | ||
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