氮硫共掺杂碳点的合成与土壤中重金属电化学检测的应用  

Synthesis of Nitrogen-Sulfur Co-Doped Carbon Dots and Application of Electrochemical Detection of Heavy Metals in Soil

作　　者：朱贝贝 石建军[1] ZHU Bei-bei;SHI Jian-jun(School of Chemical Engineering,Anhui University of Science&Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学化学工程学院,安徽淮南232001

出　　处：《安徽化工》2023年第4期24-30,共7页Anhui Chemical Industry

基　　金：安徽省高校自然科学研究重大项目:量子点耦合适配体光电传感关键技术研究及其在重金属检测中的应用(KJ2017ZD09);安徽省科技重大专项:废弃矿区及周边重金属污染土壤修复技术研发与综合示范(201903a06020003)。

摘　　要：基于微波法合成氮硫掺杂碳点(NS/CQDs),再合成氮硫掺杂碳点和氧化石墨烯的复合物(NS/CQDs-GO)。采用高分辨透射电镜(HRTEM)、傅里叶变换红外光谱仪(FT-IR)、X射线光电子能谱(XPS)等手段表征合成材料的微观形貌和元素组成。用差分脉冲溶出伏安法检测电极表面修饰NS/CQDs-GO后的溶出伏安曲线,实现对重金属的识别和检测。检测发现,NS/CQDs和GO能够通过静电作用很好地结合,修饰到电极表面后,可以成功检测出重金属离子镉和铅,得到Cd^(2+)的线性方程为y=3.10944x+3.65691,Pb^(2+)的线性回归方程为y=3.44259x+3.87429,相关系数分别为0.996和0.993,Cd^(2+)和Pb^(2+)检出限分别为1.2μg/L和2μg/L,灵敏度高,可用于土壤中重金属离子的检测。In this study,nitrogen and sulfur doped carbon dots(NS/CQDs)were synthesized by microwave method,and then the mixture of nitrogen and sulfur doped carbon dots and GO(NS/CQDS-GO)was synthesized.High resolution trans⁃mission electron microscopy(HRTEM),Fourier Transform Infrared spectroscopy(FT-IR)and X-ray photoelectron spectros⁃copy(XPS)were used to characterize the microstructure and elemental composition of the synthesized materials.Differen⁃tial pulse stripping voltammetry was used to detect the stripping voltammetry curve of NS/CQDS-GO modified electrode sur⁃face to realize the recognition and detection of heavy metals.It was found that NS/CQDs and GO could be well combined through electrostatic action,and cadmium and lead could be successfully detected after being modified to the electrode sur⁃face.The linear equation of Cd^(2+)was y=3.10944x+3.65691,and the linear regression equation of Pb^(2+)was y=3.44259x+3.87429.The correlation coefficients were 0.996 and 0.993,respectively,and the limits of detection for Cd^(2+)and Pb^(2+)were 1.2μg/L and 2μg/L.The sensitivity was high,which could be used for the detection of heavy metal ions in soil.

关 键 词：电化学检测 氮硫掺杂碳点 重金属 

分 类 号：O65[理学—分析化学]