亚硝酸盐
扫描电子显微镜
电极
X射线光电子能谱
化学
检出限
电化学
循环伏安法
电化学气体传感器
分析化学(期刊)
材料科学
化学工程
复合材料
硝酸盐
色谱法
有机化学
物理化学
工程类
作者
Qin Yang,Ninghua Chen,Yujie Zhang,Zhixiang Ye,Yingchun Yang
出处
期刊:Chemistry Letters
[Oxford University Press]
日期:2022-02-09
卷期号:51 (4): 435-439
被引量:9
摘要
Abstract An electrochemical sensor for the determination of nitrite based on La2O3-CeO2 composite modified glassy carbon electrode (La2O3-CeO2/GCE) was fabricated in this study. La2O3-CeO2 composites were prepared by reflux condensation, and their morphology and structure were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The electrochemical behavior of nitrite on the modified electrode was investigated by cyclic voltammetry (CV) and an irreversible oxidation peak emerged at 0.7 V (pH = 7). The effects of scan rate and pH on electron transfer efficiency of fabricated electrode were investigated by CV. Under the optimum conditions, the modified electrode performed outstanding electrocatalytic activity for nitrite detection with a linear range of 0.25–4000 µM and a low detection limit of 0.015 µM (S/N = 3). The constructed sensor was successfully used for the determination of nitrite in real water samples with satisfactory results (recoveries between 94.0% and 106.6%). It provides a foundation and reference for the determination of nitrite in various environmental samples.
科研通智能强力驱动
Strongly Powered by AbleSci AI