Abstract

Nitrophenol (NP) isomers are toxic for human, animals and plants. Therefore determination of them in environment is very urgent and important. In this paper, cyclic voltammetry was applied to polymerization of diphenylamine (DPA) onto the multi-walled carbon nanotubes-β-cyclodextrin (MWCNT-β-CD) modified GCE in monomer solution and 5 M H₂SO₄ and then NP isomers were determined using modified electrode. After adsorption of NP isomers on PDPA/MWCNT-β-CD at 0.2 V for 150 s, it showed two reduction peaks in phosphate buffer solution at pH 7. 4-nitrophenol (4-NP) peak was shown as an individual peak but the peaks of 2-nitrophenol (2-NP) and 3-nitrophenol (3-NP) overlapped with each other. Therefore adaptive neuro-fuzzy inference system (ANFIS) was applied for the simultaneous analysis of the voltammogram data. The detection limits for 2-NP, 3-NP and 4-NP were obtained as 5.0 × 10^–7, 1.1 × 10^–7 and 1.3 × 10^–7 M, respectively. These results showed that modified electrode has well sensitivity and selectivity for simultaneous determination of NP isomers. This sensor was applied for determination of NP isomers in water samples analysis. This is the first application of this sensor and ANFIS method for simultaneous determination of NP isomers. The reduction mechanism was also investigated.

中文翻译：

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多壁碳纳米管-β-环糊精-聚二苯胺复合修饰玻碳电极同时测定硝基苯酚异构体

摘要

硝基苯酚（NP）异构体对人，动物和植物有毒。因此，在环境中确定它们是非常紧迫和重要的。本文采用循环伏安法将二苯胺（DPA）在单体溶液和5 MH ₂ SO _4中的多壁碳纳米管-β-环糊精（MWCNT-β-CD）修饰的GCE上聚合。然后用修饰电极测定NP异构体。NP异构体在0.2 V的PDPA /MWCNT-β-CD上吸附150 s后，在pH 7的磷酸盐缓冲溶液中显示两个还原峰。4-硝基苯酚（4-NP）峰显示为单个峰，但2-硝基苯酚（2-NP）和3-硝基苯酚（3-NP）的峰相互重叠。因此，将自适应神经模糊推理系统（ANFIS）用于伏安图数据的同时分析。2-NP，3-NP和4-NP的检出限分别为5.0×10 ^–7、1.1 ×10 ^–7和1.3×10 ^–7M分别。这些结果表明，修饰电极对NP异构体的同时测定具有良好的灵敏度和选择性。该传感器用于测定水样分析中的NP异构体。这是该传感器和ANFIS方法同时测定NP异构体的首次应用。还研究了还原机理。