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Abstract
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In this study, an innovative and efficient solid − phase microextraction (SPME) sorbent was introduced based on
carbon quantum dots (CQDs) modified carbon felt (CF) substrate. CF, due to its unique characteristics including
high porosity, solvent durability (without swelling), and simple modification, it was proposed as an attractive
platform for preconcentration purposes. To create an impressive adsorption capacity, the synergistic effects of
CQDs and the carbonaceous structure of CF were profited off. CQDs were successfully synthesized on CF fibers by
using an improved one-step hydrothermal method, and the resulting sorbent was referred to as CQDs@CF. Since
bisphenol A (BPA) is an environmental toxin and can disrupt the endocrine system and potentially lead to cancer,
highlighting the importance of detecting its presence. The prepared sorbent was used to extract bisphenol A
(BPA) as a model compound from the real samples, followed by HPLC − UV analysis. Extraction parameters
including desorption solvent type, and its volume, extraction, and desorption time, salting out effect and, so
lution pH were optimized. FESEM, EDX, FT − IR, and N2 adsorption–desorption were used to characterize the
sorbent morphology, structure, and elemental contents. Under optimal conditions, the response linearity in the
range of 0.05 − 500 ng mL− 1 and detection limit at the level of 0.01 ng mL− 1 were obtained. Additionally, the
relative standard deviations (RSD) for newly prepared CQDs@CF (sorbent to sorbent repeatability) and a certain
multi − used CQDs@CF (single sorbent repeatability) at a concentration of 100 ng mL− 1 of BPA, were found to be
7.2 and 4.8, respectively.
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