Electrochemical sensor based on magnetic graphene oxide@gold nanoparticles molecular imprinted polymers for determination of dibutyl phthalate.
A novel composite of magnetic graphene oxide gold nanoparticles molecular imprinted polymers (MGO@AuNPs MIPs) was synthesized and applied as a molecular recognition element to construct dibutyl phthalate (DBP) electrochemical sensor. The composite of MGO@AuNPs was first synthesized using coprecipitation and self assembly technique. Then the template molecules (DBP) were absorbed at the MGO@AuNPs surface due to their excellent affinity, and subsequently, selective copolymerization of methacrylic acid and ethylene glycol dimethacrylate was further achieved at the MGO@AuNPs surface. Potential scanning was presented to extract DBP molecules from the imprinted polymers film rapidly and completely. As a consequence, an electrochemical sensor for highly sensitive and selective detection of DBP was successfully constructed as demonstration based on the synthesized MGO@AuNPs MIPs composite. Under optimal experimental conditions, selective detection of DBP in a linear concentration range of 2.5 x 10( 9) 5.0 x 10( 6)mol/L was obtained. The new DBP electrochemical sensor also exhibited excellent repeatability, which expressed as relative standard deviation (RSD) was about 2.50% for 30 repeated analyses of 2.0 x 10( 6)mol/L DBP.
Talanta