Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, P.O. Box 9177948974, Mashhad, Iran.
Inorganic Chemistry Research Laboratory, Department of Chemistry, University of Sistan and Baluchestan, P.O. Box 98135-674, Zahedan, Iran.
Mikrochim Acta. 2022 Jul 2;189(8):267. doi: 10.1007/s00604-022-05361-y.
A sensor was developed for the first time based on polydopamine nanospheres doped with I, I, and IO species (PDA-Iodine), to determine the concentration of p-aminophenol (p-AP), phenol (Ph), and p-nitrophenol (p-NP) simultaneously. These polymeric nanospheres were successfully characterized using a variety of techniques including field emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared, Raman spectroscopy, and X-ray diffraction analysis. A carbon paste electrode was modified with the PDA-Iodine (CPE/PDA-Iodine). Because of the electrocatalytic activity of DA/DQ, I and I species (in the structure of PDA-Iodine), CPE/PDA-Iodine shows enhancement in the electrooxidation peak currents as well as slight negative shift in peak potentials of p-AP, Ph, and p-NP compared with a bare carbon paste electrode. Under optimal experimental conditions, the linear calibration plots are linear in the ranges 0.5-120 μM for p-AP, 0.7-120 μM for Ph, and 1.0-100 μM for p-NP with limits of detection of 30, 40, and 80 nM for p-AP, Ph, and p-NP, respectively (S/N = 3). To prove the performance of the method, the repeatability of the signals of CPE/PDA-Iodine was evaluated and the RSD values obtained were 2.9%, 3.2%, and 3.1% for p-AP (45 µM), Ph (40 µM), and p-NP (40 µM), respectively. The CPE/PDA-Iodine is a promising new sensor for sensing p-AP, Ph, and p-NP simultaneously in tap and river water sample and the values of recoveries for spiked samples were in the range 94.0-104.4%.
首次研制了一种基于聚多巴胺纳米球掺杂 I、I 和 IO 物种（PDA-碘）的传感器，用于同时测定对氨基酚（p-AP）、苯酚（Ph）和对硝基苯酚（p-NP）的浓度。这些聚合纳米球成功地使用各种技术进行了表征，包括场发射扫描电子显微镜、透射电子显微镜、X 射线光电子能谱、傅里叶变换红外光谱、拉曼光谱和 X 射线衍射分析。用 PDA-碘（CPE/PDA-碘）修饰了碳糊电极。由于 DA/DQ、I 和 I 物种（在 PDA-碘的结构中）的电催化活性，与裸碳糊电极相比，CPE/PDA-碘显示出对 p-AP、Ph 和 p-NP 的电化学氧化峰电流增强，并且峰电位略微负移。在最佳实验条件下，p-AP 的线性校准曲线在 0.5-120μM 范围内，Ph 的线性校准曲线在 0.7-120μM 范围内，p-NP 的线性校准曲线在 1.0-100μM 范围内，p-AP、Ph 和 p-NP 的检测限分别为 30、40 和 80nM（S/N=3）。为了证明该方法的性能，评估了 CPE/PDA-碘信号的重复性，得到的 p-AP（45μM）、Ph（40μM）和 p-NP（40μM）的 RSD 值分别为 2.9%、3.2%和 3.1%。CPE/PDA-碘是一种有前途的新型传感器，可用于同时检测自来水中的 p-AP、Ph 和 p-NP，以及河水样品中 p-AP、Ph 和 p-NP 的加标回收率在 94.0-104.4%范围内。
