期刊
CHINESE JOURNAL OF CHEMISTRY
卷 27, 期 10, 页码 2043-2048出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cjoc.200990343
关键词
MIP/MWCNT; electrochemical sensor; selectivity; DNB determination
资金
- National Natural Science Foundation of China [20675032]
- Program for New Century Excellent Talents in University [NCET-07-0293]
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
An electrochemical sensor was modified with multi-wall carbon nanotubes (MWCNT) and molecularly imprinted polymer (MIP) material synthesized with acrylamide and ethylene glycol dimethacrylate (EGDMA) in the presence of 1,3-dinitrobenzene (DNB) as the template molecule. The MWCNT and MIP layers were successively modified on the surface of a glassy carbon electrode (GCE), of which the MIP film works as an artificial receptor due to its specific molecular recognition sites. The MIP material was characterized by FT-IR and electrochemical methods of square wave voltammetry (SWV). The interferences of other nitroaromatic compounds (NAC) such as 2,4,6-trinitrotoluene (TNT), 1,3,5-trinitrobenzene (TNB) and 2,4-dinitrotoluene (DNT) to DNB were also investigated by the prepared MIP/MWCNT electrode. Compared with other traditional sensors, the MIP/MWCNT modified electrode shows good selectivity and sensitivity. In addition, the current responses to DNB are linear with the concentration ranging from 4.5 x 10(-8) to 8.5 x 10(-6) mol/L with the detection limits of 2.5 x 10(-8) (-0.58 V) and 1.5 x 10(-8) mol/L (-0.69 V) (S/N= 3). The construction process of MIP/MWCNT modified electrode was also studied as well. All results indicate that the MIP/MWCNT modified electrode established an improving way for simple, fast and selective analysis of DNB.
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