College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, PR China.
J Hazard Mater. 2012 Jan 15;199-200:111-8. doi: 10.1016/j.jhazmat.2011.10.066. Epub 2011 Oct 29.
In this study, we demonstrated a highly sensitive electrochemical sensor for the determination of bisphenol A (BPA) in aqueous solution by using single-walled carbon nanotubes (SWCNTs)/β-cyclodextrin (β-CD) conjugate (SWCNT-CD) modified glassy carbon electrode (GCE). The cyclic voltammetry results show that the modified GCE exhibits strong catalytic activity toward the oxidation of BPA with a well-defined cyclic voltammetric peak at 0.543 V. The response current exhibits a linear range between 10.8 nM and 18.5 μM with a high sensitivity (1256 μA mM(-1)). The detection limit of BPA is 1.0 nM (S/N=3). The enhanced performance of the fabricated sensor can be attributed to the combination of the excellent electrocatalytic properties of SWCNTs and the molecular recognition ability of β-CD. The sensor was successfully applied to determine BPA leached from real plastic samples with good recovery, ranging from 95% to 103%.
在这项研究中，我们展示了一种基于单壁碳纳米管（SWCNTs）/β-环糊精（β-CD）复合物（SWCNT-CD）修饰玻碳电极（GCE）的高灵敏度电化学传感器，用于测定水溶液中的双酚 A（BPA）。循环伏安法结果表明，修饰后的 GCE 对 BPA 的氧化具有很强的催化活性，在 0.543 V 处呈现出明确的循环伏安峰。响应电流在 10.8 nM 至 18.5 μM 之间呈现出线性范围，具有很高的灵敏度（1256 μA mM-1）。BPA 的检测限为 1.0 nM（S/N=3）。所制备传感器的优异性能可归因于 SWCNTs 的优异的电催化性能和β-CD 的分子识别能力的结合。该传感器成功地应用于测定从实际塑料样品中浸出的 BPA，回收率良好，范围为 95%至 103%。
