مشخصات پژوهش

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.