Li Dongdong, Qiu Xianhua, Guo Huiqin, Duan Dawei, Zhang Wanqing, Wang Jichao, Ma Jingjing, Ding Yuan, Zhang Zhongyin
School of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang, 330063, China; School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, 453003, China.
School of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang, 330063, China.
Environ Res. 2021 Nov;202:111605. doi: 10.1016/j.envres.2021.111605. Epub 2021 Jun 29.
In this study, a novel electrochemical sensor for simultaneous detection of Pb(II) and Cu(II) was constructed by using Zn/Ni-ZIF-8/XC-72/Nafion hybrid material as electrode surface modifier. XRD, FT-IR, XPS and SEM were used to study the crystal structure, functional groups, element types and morphologies of the prepared materials. The electrochemical performance of the Zn/Ni-ZIF-8/XC-72/Nafion/GCE sensor were investigated by CV, EIS and DPV. In addition, the effects of various conditions including pH, the type of buffer and the ratio of Zn/Ni-ZIF-8 to XC-72 were also explored for the determination of Pb(II) and Cu(II). Under the optimum conditions, the constructed sensor exhibited outstanding linear response of Pb(II) (0.794-39.6 ppm) and Cu(II) (0.397-19.9 ppm) with detection limits of 0.0150 and 0.0096 ppm, respectively. Finally, the fabricated sensor was further used to detect Pb(II) and Cu(II) in real samples, and the satisfactory recovery was obtained.
在本研究中，通过使用Zn/Ni-ZIF-8/XC-72/全氟磺酸混合材料作为电极表面改性剂，构建了一种用于同时检测Pb(II)和Cu(II)的新型电化学传感器。利用X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、X射线光电子能谱（XPS）和扫描电子显微镜（SEM）研究了所制备材料的晶体结构、官能团、元素种类和形貌。通过循环伏安法（CV）、电化学阻抗谱（EIS）和差分脉冲伏安法（DPV）研究了Zn/Ni-ZIF-8/XC-72/全氟磺酸/玻碳电极（GCE）传感器的电化学性能。此外，还探讨了包括pH值、缓冲液类型以及Zn/Ni-ZIF-8与XC-72的比例等各种条件对Pb(II)和Cu(II)测定的影响。在最佳条件下，构建的传感器对Pb(II)（0.794 - 39.6 ppm）和Cu(II)（0.397 - 19.9 ppm）表现出出色的线性响应，检测限分别为0.0150和0.0096 ppm。最后，将制备的传感器进一步用于实际样品中Pb(II)和Cu(II)的检测，并获得了满意的回收率。
