An efficient electrochemical sensor based on multi-walled carbon nanotubes functionalized with polyethylenimine for simultaneous determination of o-nitrophenol and p-nitrophenol

聚乙烯亚胺 硝基苯酚 碳纳米管 线性扫描伏安法 电化学 材料科学 选择性 纳米复合材料 核化学 检出限 线性范围 电化学气体传感器 循环伏安法 纳米技术 化学 色谱法 电极 有机化学 催化作用 物理化学 转染 生物化学 基因
作者
Peihong Deng,Ying Zeng,Yanping Wei,Junhua Li,Liangyuan Yao,Xia Liu,Jianhua Ding,Kanghua Li,Quanguo He
出处
期刊:Microchemical Journal [Elsevier]
卷期号:186: 108340-108340 被引量:12
标识
DOI:10.1016/j.microc.2022.108340
摘要

In this paper, carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) functionalized with polyethylenimine (PEI) was prepared and a glassy carbon electrode (GCE) modified with the above nanocomposites (denoted as PEI-MWCNTs-COOH/GCE) was fabricated. Using p-nitrophenol (p-NP) and o-nitrophenol (o-NP) as model compounds, the electrocatalysis of the modified electrode was studied. The results show that the sensitivity and selectivity of the modified electrode are significantly improved due to the synergistic effect of MWCNTs-COOH and PEI. The oxidation peak potentials of o-NP and p-NP were separated by about 60 mV. Second-order derivative linear sweep voltammetry (SDLSV) were used for the quantitative analysis of p-NP and o-NP. Under the optimized condition, the linear range for o-NP was 2-100 μM in the presence of 10 μM p-NP, while the linear range for p-NP was 0.2-100 μM in the presence of 10 μM o-NP. The detection limits were 0.6 μM and 0.04 μM for o-NP and p-NP, respectively. The PEI-MWCNTs-COOH/GCE exhibited excellent reproducibility and stability. Finally, the developed sensor was applied for the determination of o-NP and p-NP in environmental water samples with high precision and accuracy.
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