期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 164, 期 2, 页码 H63-H69出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0891702jes
关键词
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资金
- National Natural Science Foundation of China [21003045, 21173075, 21403063]
- Collaborative Innovation Center of New Chemical Technologies for Environmental Benignity and Efficient Resource Utilization, Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
- Construct Program of the Key Discipline in Hunan Province
In this work, a highly sensitive electrochemical sensor for 4-nitrophenol (4-NP) was facilely constructed based on a Nafion modified glass carbon nanofilm electrode (Nafion-GCNFE). The GCNFE with high activity was quickly fabricated from a smooth GC surface in a blank electrolyte solution of H2SO4 with square wave potential pulses (SWPPs), where the nanofilm formation might be related to repeated anodic oxidation coupled with SO42- intercalation/deintercalation. Moreover, a Nafion modifier can improve the 4-NP adsorption on GCNFE, as confirmed by the Fourier transform infrared spectroscopy (FTIR), and hence increased the differential pulse voltammetry (DPV) response of 4-NP. The influence of pulse potential, pulse time, pulse frequency, and Nafion amount on the DPV signal of 4-NP was investigated in detail. Under an optimized detection condition, the electrochemical sensor based on Nafion-GCNFE exhibited excellent performances in sensing 4-NP with a wide linear range of 10 nM to 50 mu M, a very low detection limit of 4 nM (3 sigma/slope), good reproducibility and reusability, high selectivity and long-term stability (over four weeks), which was successfully used for the 4-NP determination in real water samples with satisfied results. (C) 2016 The Electrochemical Society. All rights reserved.
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