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Preparation Of Electrochemical Sensor For Bisphenol A Determination Based On Molecularly Imprinted-Carbon Nanotubes

Posted on:2011-02-18Degree:MasterType:Thesis
Country:ChinaCandidate:H B ChengFull Text:PDF
GTID:2178360305455863Subject:Environmental Engineering
Abstract/Summary:PDF Full Text Request
Because of the teratogenic, carcinogenic, mutagenic and endocrine disrupting effects, as well as the detection in water around the world, bisphenol A (BPA) has been listed as a typical endocrine disruptor. Nowadays, the environmental behavior and risk assessment of environmental hormones such as BPA are focused in environment field. Owing to the complexity of environmental samples or requirements of field determination, rapid, highly sensitive and selective analysis methods become the key issues restricted related studies.Based on the unique electronic properties and high adsorption capacity of carbon nanotubes as well as the specific recognition ability of molecularly imprinted polymers (MIPs), a novel molecularly imprinted electrochemical sensor with high sensitivity and selectivity was constructed for detection of BPA in water. The sensor was fabricated by directly preparing molecularly imprinted membrane of BPA on a multi-wall carbon nanotubes (MWNTs) modified glassy carbon electrode (GCE). The linear sweep voltammogram (LSV) of BPA at this sensor exhibited a well-defined anodic peak which was used to determine BPA.Comparing to MIP/GCE, BPA exhibited much higher LSV current response at the MIP/MWNTs/GCE. It could be inferred that MWNTs can expand the current response signal by enhancing electron transfer on the surface of the sensor. Under optimum conditions, the oxidation current was linear to the concentration of BPA in the range from 0.1 to 10mg/L with correlation coefficient of 0.9989 and detection limit of 0.0242mg/L (S/N=3). At the same concentration, the LSV response current of BPA at MIP/MWNTs/GCE was 46.5,25.0,14.4 and 16.1 times that of p-nitrophenol, phenol, hydroxyphenol or hydroquinone respectively, which indicated that the MIP/MWNTs/GCE performed excellent selectivity.This is the first time to report the determination of BPA in water by utilizing molecular imprinting technology in combination with carbon nanotubes. This study will provide important technical support to rapid and highly sensitive field analysis of BPA in water, and has important significance for environmental risk assessment and early warning of environmental emergencies.
Keywords/Search Tags:Molecularly Imprinted, Multi-wall Carbon Nanotubes (MWNTs), Electrochemical Sensor, Bisphenol A (BPA)
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