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Application Study and Preparation of Chemically Modified Electrodes in Environmental Detection

Author: ZhaoQing
Tutor: YaoBingHua
School: Xi'an University of Technology
Course: Environmental Engineering
Keywords: Chemically modified electrode Carbon Nanotubes Hydroquinone Nitrophenol Voltammetry
CLC: X832
Type: Master's thesis
Year: 2005
Downloads: 615
Quote: 4
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Abstract


Phenolic compounds are rubber , dyes , pharmaceuticals and petroleum industries discharge wastewater main organic pollutants , the current is limited to detection of phenols detect the total amount of volatile phenols , phenolic contaminants for analysis of specific water quality testing research is an important content. In this paper, carbon nanotube modified electrode for two representative phenolic pollutants - hydroquinone and nitrophenol , the use of three -electrode electrochemical system for the modified electrode electrochemical detection method discussed electrode preparation method , systematic study of the modified electrode electrically catalytic mechanism of phenolic compounds , achieved the following results : 1 , the use of multi-walled carbon nanotubes (MWNT) superior physical and chemical properties , obtained MWNT / GC modified electrode best Preparation Methods: N , N- dimethylformamide (DMF) as a dispersion medium , the acid-treated MWNT after ultrasonic dispersion in DMF , to obtain a dispersion. The dispersion was then coated on the electrode surface , made ??of modified electrode . At pH5.6 ~ 7.0 phosphate buffer solution , the electrode can catalyze hydroquinone and electrochemical oxidation of p-nitrophenol . 2 , in 0.2mol · dm -3 phosphate buffer solution (pH 5.5) , the hydroquinone in MWNT modified electrode has a sensitive oxidation peak , the peak potential is 0.068V (vs. SCE), oxidation peak current and the concentration of hydroquinone in 2.0 × 10 -6 ~ 2.6 × 10 -3 mol · dm -3 there is a good linear relationship between : i p (μA) = 60.0 6.2 × 10 4 c (r = 0.993). Hydroquinone detection limit of 1.0 × 10 -6 mol · dm -3 . At a concentration of 2.0 × 10 -4 mol · dm -3 hydroquinone as interference test specimen ( ± 5% error in between ) , the results showed that: 20 times hydroquinone Cu 2 ,

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CLC: > Environmental science, safety science > Environmental Quality Assessment and Environmental Monitoring > Environmental monitoring > Water quality monitoring
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