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

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。

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 0.1-3.6µM and 0.1-2.8µM with detection limits(S/N=3)of 0.0384µM and 0.00641µM,respectively.The experimental results showed that PEDOT/g-C3N4 can be used to detect heavy metal ions(Cd2+and Pb2+).