聚(3,4-乙撑二氧噻吩)/石墨相氮化碳电化学传感器的合成及对重金属离子的检测

Synthesis of Poly(3,4-Ethelenedioxythio-Phene)/Graphitic Carbon Nitride Electrochemical Sensor for Heavy Metal Ion Determination

摘要: 本文通过化学氧化法制备得到了聚(3,4-乙撑二氧噻吩)/石墨相氮化碳(PEDOT/g-C₃N₄)材料。通过傅里叶红外光谱(FT-IR)，紫外可见吸收光谱(UV-vis)，X射线衍射(XRD)，扫描电子显微镜(SEM)，透射电子显微镜(TEM)对所得到的复合物进行结构表征和形貌分析，并采用微分脉冲伏安法对复合物修饰的玻碳电极进行重金属(Cd²⁺和Pb²⁺)的电化学测定。实验结果表明，复合物修饰的玻碳电极对Cd²⁺和Pb²⁺的具有较好的响应，其检测线性范围分别是0.1~3.6 µM和0.1~2.8 µM,其检测极限(S/N = 3)分别为0.0384 µM和0.00641 µM。实验结果表明，PEDOT/g-C₃N₄可用于重金属离子(Cd²⁺和Pb²⁺)的检测。

Abstract: In this paper, poly(3,4-ethelenedioxythiophene)/graphitic carbon nitride (PEDOT/g-C₃N₄) compo-sites were prepared by chemical oxidation polymerization. The obtained composite was analysed by Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible absorption spectroscopy (UV-vis), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Electrochemical determination of heavy metal ions (Cd²⁺ and Pb²⁺) was carried out by differential pulse voltammetry (DPV) on composite-modified glass carbon electrodes. The results showed that PEDOT/g-C₃N₄/GCE exhibited the wide linear responses for Cd²⁺ and Pb²⁺, ranging from 0.1 - 3.6 µM and 0.1 - 2.8 µM with detection limits (S/N = 3) of 0.0384 µM and 0.00641 µM, respectively. The experimental results showed that PEDOT/g-C3N4 can be used to detect heavy metal ions (Cd²⁺ and Pb²⁺).