Waste-to-resource: Utilization of carbon dots derived from proliferating Sargassum aquifolium (Turner) C. Agardh for fluorescent detection of levofloxacin
Abstract
The recurrent proliferation and blooms of Sargassum have emerged as a major environmental challenge in tropical and temperate coastal regions, with profound implications for ecological balance, economic stability, and societal well-being. Levofloxacin (LVF), a fluoroquinolone antibiotic, is physiologically toxic and its residues and accumulation in the aquatic environment have become a serious threat to ecosystems and human health. This work presents a novel approach for the fluorescent detection of LVF, a common antibiotic in environmental waters, using carbon dots derived from the abundant invasive seaweed Sargassum aquifolium (Turner) C. Agardh. The Sargassum carbon dots (SACD) were prepared by a simple one-step hydrothermal method and can reduce the internal filtering effect (IFE) of LVF, thereby facilitating fluorescence detection of high-concentrations of LVF. SEM and TEM were used to characterize the structure, and SACD exhibited a spherical amorphous carbon with a partial lattice structure. The composition of SACD was further analyzed by using FTIR and XPS after synthesis. This method offers a wide detection range (1 μM-100 μM, R2 = 0.998) and low detection limit (0.3 μM) for LVF analysis, exhibiting high recovery rates (103.4 %-113.9 %) in spiked real environmental water samples, demonstrating its potential application performance. The SACD can selectively detect LVF in the presence of the common interfering substances. Therefore, SACD has promising applications in…
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