Luo Suxing, Wu Yuanhui, Mou Qingsong, Li Jinhai, Luo Xiaoxue
Department of Chemistry and Chemical Engineering, Zunyi Normal College Zunyi 563006 P. R. China
Special Key Laboratory of Electrochemistry for Materials of Guizhou Province Zunyi 563006 P. R. China.
RSC Adv. 2019 Jun 6;9(31):17897-17904. doi: 10.1039/c9ra02614b. eCollection 2019 Jun 4.
In this study, a novel tetrabromobisphenol A (TBBPA) sensor was fabricated based on a CTAB-capped gold nanoparticle (AuNPs)-thio-β-cyclodextrin (SH-β-CD)/graphene oxide modified glassy carbon electrode (GCE). The peak current of TBBPA was dramatically enhanced by the AuNPs with a diameter of 6.2 nm on the modified electrodes compared with the other sized particles (10.1 or 16.1 nm). To further improve the electrochemical performance of the modified electrode, the influence of pH of the buffer solution and the accumulation time on the determination were investigated. The optimum pH and accumulation time were 7.0 and 180 s, respectively. The developed sensor exhibited good reproducibility, and excellent sensitivity and selectivity, showing a low detection limit (1.2 × 10 mol L) and a linear range from 1.5 × 10 to 7 × 10 mol L. In addition, a possible oxidization mechanism of TBBPA was also discussed. Finally, this sensor was successfully applied to detect TBBPA in water samples, and the results were consistent with those acquired by high-performance liquid chromatography.
在本研究中，基于十六烷基三甲基溴化铵包覆的金纳米粒子（AuNPs）-硫代-β-环糊精（SH-β-CD）/氧化石墨烯修饰玻碳电极（GCE）制备了一种新型四溴双酚A（TBBPA）传感器。与其他尺寸的粒子（10.1或16.1 nm）相比，修饰电极上直径为6.2 nm的AuNPs显著增强了TBBPA的峰电流。为进一步提高修饰电极的电化学性能，研究了缓冲溶液pH值和富集时间对测定的影响。最佳pH值和富集时间分别为7.0和180 s。所制备的传感器具有良好的重现性、优异的灵敏度和选择性，检测限低（1.2×10 mol/L），线性范围为1.5×10至7×10 mol/L。此外，还讨论了TBBPA可能的氧化机理。最后，该传感器成功应用于水样中TBBPA的检测，结果与高效液相色谱法获得的结果一致。
