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A graphene oxide-based electrochemical sensor for sensitive determination of 4-nitrophenol

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成果类型:
期刊论文
作者:
Li, Junhua;Kuang, Daizhi;Feng, Yonglan;Zhang, Fuxing;Xu, Zhifeng;Liu, Mengqin
通讯作者:
Li, J.(junhua325@yahoo.com.cn)
作者机构:
[ Xu, Zhifeng ; Li, Junhua ; Kuang, Daizhi ; Feng, Yonglan ; Liu, Mengqin ; Zhang, Fuxing ] Department of Chemistry and Material Science, Hengyang Normal University, Hengyang, 421008, Hunan, China
[ Xu, Zhifeng ; Li, Junhua ; Kuang, Daizhi ; Feng, Yonglan ; Liu, Mengqin ; Zhang, Fuxing ] Key Laboratory of Functional Organometallic Materials of Hunan Province College, Hengyang Normal University, Hengyang, 421008, Hunan, China
通讯机构:
[Li, Junhua] Department of Chemistry and Material Science, Hengyang Normal University, Hengyang, 421008 Hunan, PR China.
语种:
英文
关键词:
4-Nitrophenol - 4-nitrophenol (4-NP) - Acetate buffers - Detection limits - Direct determination - Electrocatalytic activity - Electrochemical behaviors - ELectrochemical methods - Experimental parameters - Fabricated sensors - Glassy carbon electrodes - Heterogeneous rate constant - High selectivity - Long term stability - Optimal conditions - Overpotential - Quantitative detection - Reduction peak - Reduction peak currents - Scanning Electron Microscope - Sensitive detection - Signal-noise ratio - Transfer electrons - Water samples
期刊:
Journal of hazardous materials
ISSN:
0304-3894
年:
2012
卷:
201-202
页码:
250-259
文献类别:
WOS:Article;EI:Journal article (JA)
所属学科:
ESI学科类别:工程学;WOS学科类别:Engineering, Civil;Engineering, Environmental;Environmental Sciences
入藏号:
WOS:000300262400032;EI:20120214669733;PMID:22178284
基金类别:
Key Laboratory in Hunan Universities [09K099, 10K010]; Hengyang Normal University
机构署名:
本校为第一且通讯机构
院系归属:
化学与材料科学学院
摘要:
A graphene oxide (GO) film coated glassy carbon electrode (GCE) was fabricated for sensitive determination of 4-nitrophenol (4-NP). The GO-based sensor was characterized by scanning electron microscope, atomic force microscopy and electrochemical impedance spectroscopy. The electrochemical behaviors of 4-NP at the GO-film coated GCE were investigated in detail. In 0.1 M acetate buffer with a pH of 4.8, 4-NP yields a very sensitive and well-defined reduction peak at the GO-modified GCE. It is found that the GO film exhibits obvious electrocatalytic activity toward the reduction of 4-NP since it not only increases the reduction peak current but also lowers the reduction overpotential. Based on this, an electrochemical method was proposed for the direct determination of 4-NP. Various kinetic parameters such as transfer electron number, transfer proton number and standard heterogeneous rate constant were calculated, and various experimental parameters were also optimized. Under the optimal conditions, the reduction peak current varies linearly with the concentration of 4-NP ranging from 0.1 to 120 mu M, and the detection limit is 0.02 mu M at the signal noise ratio of 3. Moreover, the fabricated sensor presented high selectivity and long-term stability. This electrochemical sensor was further applied to determine 4-NP in real water samples, and it showed great promise for simple, sensitive, and quantitative detection of 4-NP. (C) 2011 Elsevier B.V. All rights reserved.
参考文献:
Adams R. N., 1969, ELECTROCHEMISTRY SOL
ANSON FC, 1964, ANAL CHEM, V36, P932, DOI 10.1021/ac60210a068
Padilla-Sanchez JA, 2010, J CHROMATOGR A, V1217, P5724, DOI 10.1016/j.chroma.2010.07.004
Bao Y, 2011, ELECTROANAL, V23, P878, DOI 10.1002/elan.201000607
BOEHM HP, 1994, CARBON, V32, P759, DOI 10.1016/0008-6223(94)90031-0

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