期刊
ELECTROCHIMICA ACTA
卷 176, 期 -, 页码 448-455出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.07.054
关键词
glass carbon; uniform nanoparticle film; square wave potential pulse; voltammetric determination; 4-nitrophenol
资金
- National Natural Science Foundation of China [21003045, 21173075]
- Opening Fund of Hubei Key Laboratory for Processing and Application of Catalytic Materials [ch201409]
- 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
Voltammetric determination of 4-nitrophenol (4-NP) has been preformed at uniform nanoparticle film electrode (UNFE) of glass carbon (GC) (GC-UNFE). The UNFE was facilely fabricated from smooth GC surface in a blank solution of NaOH with square wave potential pulses (SWPPs). This film was composed of uniform, dense GC nanoparticles decorated with oxygen-containing functional groups and exhibited high electrochemical activity. The film formation might be related to repeated pulse electrochemical oxidation of GC surface. The as-prepared film was characterized by cyclic voltammetry (CV), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The parameters including anodic potential, time and frequency of SWPPs for film preparation were examined on CV behaviors of 4-NP redox. The oxidation peak was chosen to the 4-NP determination, and under the optimized conditions, its currents varied linearly with a concentration range for 4-NP of 0.5-3000 mM (over two consecutive calibration curves) with a detection limit of 0.23 mM (3s/slope) and quantification limit of 0.77 mM (10 sigma/slope). The advantages of present method included easy fabrication, high sensitivity, good stability, good reproducibility and very broad linear range, and it was successfully applied to detect 4-NP in water samples with satisfied results. (C) 2015 Elsevier Ltd. All rights reserved.
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