单层二硫化钨-羧基化多壁碳纳米管修饰玻碳电极测定水中对硝基苯胺
Determination of p-Nitroaniline in Water by Single-Layer Tungsten Disulfide-Carboxylated Multi-Walled Carbon Nanotubes Modified Glassy Carbon Electrode
摘 要
制备单层二硫化钨（WS2）与羧基化多壁碳纳米管（CMWCNTs）复合材料，用以修饰玻碳电极（GCE），构建了WS2/CMWCNTs/GCE电化学传感器测定水中对硝基苯胺（PNA）。采用循环伏安法（CV）对修饰电极进行表征，探讨了PNA在修饰电极上的电化学行为，结果表明：WS2/CMWCNTs复合膜对PNA有显著的电催化作用，循环伏安曲线显示在pH 7.0的磷酸盐缓冲溶液中，PNA在-0.7 V处有明显的还原峰，在优化的试验条件下，PNA的浓度在500 μmol·L-1以内与其峰电流呈线性关系，检出限（3s/k）为0.63 μmol·L-1。应用构建的修饰电极对废水进行分析，加标回收率为92.8%~102%，测定值的相对标准偏差（n=6）均小于5.0%。
羧基化多壁碳纳米管
对硝基苯胺
循环伏安法
single-layer tungsten disulfide
carboxylate multi-walled carbon nanotube
p-nitroaniline
cyclic voltammetry
Abstract
Single-layer tungsten disulfide (WS2) and carboxylate multi-walled carbon nanotubes (CMWCNTs) composites were prepared to modify glassy carbon electrode (GCE). The WS2/CMWCNTs/GCE electrochemical sensor was constructed for the determination of p-nitroaniline (PNA) in water. The modified electrode was characterized by cyclic voltammetry (CV), and the electrochemical behavior of PNA on cyclic voltammetry was discussed. The results showed that the WS2/CMWCNTs composite membrane had significant electro-catalysis for PNA. Cyclic voltammetry curve showed that in the pH 7.0 phosphate buffer solution, significant reduction peak of PNA was found at -0.7 V. After the conditions were optimized, linearity relationship between the concentration of PNA and its peak current value was ranged within 500 μmol·L-1, with detection limit (3s/k) of 0.63 μmol·L-1. The modified electrode was used to determine the sample of wastewater, recovery with adding standard was kept in the range of 92.8%-102%, and RSDs (n=6) of the measured values were found less than 5.0%.
中图分类号 O657.1 DOI 10.11973/lhjy-hx202104003
所属栏目 试验与研究
基金项目 国家自然科学基金（81973097）；职业危害识别与控制湖北省重点实验室开放基金项目（OHIC2018G04）
收稿日期 2020/2/15
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备注彭苏娟,硕士研究生,研究方向为卫生检验与检疫
引用该论文: PENG Sujuan,CHEN Haichuan,MEI Yong,GU Yingying,SONG Shizhen,PAN Hongzhi. Determination of p-Nitroaniline in Water by Single-Layer Tungsten Disulfide-Carboxylated Multi-Walled Carbon Nanotubes Modified Glassy Carbon Electrode[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2021, 57(4): 303～308
彭苏娟,陈海川,梅勇,顾缨缨,宋世震,潘洪志. 单层二硫化钨-羧基化多壁碳纳米管修饰玻碳电极测定水中对硝基苯胺[J]. 理化检验－化学分册, 2021, 57(4): 303～308
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