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Catalytic Degradation of Tetracycline in Aqueous Solution Using Cu-Modified γ-MnO2 Nanostructures | ||
| Challenges in Nano and Micro Scale Science and Technology | ||
| مقاله 5، دوره 14، شماره 2، آذر 2026، صفحه 45-56 اصل مقاله (853.7 K) | ||
| نوع مقاله: Original Research Paper | ||
| شناسه دیجیتال (DOI): 10.22111/cnmst.2026.55742.1308 | ||
| نویسندگان | ||
| Alireza Khorshidi* 1؛ Masoumeh Keramati2 | ||
| 1Faculty Of Sciences, Namjoo Str. Rasht, Guilan | ||
| 2Faculty of Chemistry, University of Guilan | ||
| چکیده | ||
| Tetracycline antibiotics are among the most recalcitrant micropollutants detected in aquatic environments, posing significant threats to public health due to their low biodegradability, promotion of antibiotic resistance, and endocrine-disrupting potential. In this study, γ-MnO2 and Cu-modified γ-MnO2 (Cu-γ-MnO2) nanostructures were successfully synthesized and evaluated as heterogeneous catalysts for the oxidative degradation of tetracycline in aqueous solution in the presence of H2O2. The synthesized materials were thoroughly characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), and Fourier-transform infrared spectroscopy (FTIR). XRD confirmed the pure γ-MnO2 phase for both materials, with Cu incorporation causing no new crystalline phases but inducing a slight reduction in crystallite size. FE-SEM revealed a unique hedgehog-like morphology with needle-shaped nanocrystals assembled into spherical superstructures (17–36 nm), which was preserved upon Cu modification. Under optimized conditions (pH 4, 55°C, 20 mg catalyst, 1 mL of 30% H2O2, 20 min), Cu-γ-MnO2 achieved 98% tetracycline degradation, significantly outperforming unmodified γ-MnO2 (70%). The reaction followed NLLS biphasic kinetics (k₁ = 1.343 min−1 (R2 = 0.979). The Cu-γ-MnO2 catalyst demonstrated exceptional recyclability, retaining >80% activity after seven consecutive cycles, underscoring its practical feasibility for wastewater remediation applications. | ||
| کلیدواژهها | ||
| Manganese dioxide؛ Tetracycline؛ Copper modification؛ Heterogeneous catalysis؛ Wastewater treatment | ||
| مراجع | ||
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