Development of a highly selective and sensitive electrochemical sensor for Bi3+ determination based on nano-structured bismuth-imprinted polymer modified carbon/carbon nanotube paste electrode

Add time:10/01/2019    Source:infona.pl

A new nano-structured bismuth(III)-imprinted polymer was prepared by copolymerization of Bi(III)-methylene succinate complex and ethylene glycol dimethacrylate in acetonitrile via precipitation polymerization technique. The polymeric nanoparticles were then used as the Bi3+ selective modifier of a carbon/carbon nanotube paste electrode. Bismuth ions were accumulated on the surface of the electrode, immersed in the Bi3+ solution for a definite time. Then, the anodic striping differential pulse voltammetric signal of the modified electrode was recorded as analytical signal which was significantly higher than that recorded by the non-imprinted polymer based electrode, at the same experimental conditions. Compared to the previously reported carbon paste electrodes, this sensor was more selective, regarding potential interfering species of Cu2+ and Ag+. The electrode exhibited a dynamic linear response range of 0.2–2μmolL−1 and detection limit of 8.9nmolL−1 for Bi3+ measurement. The sensitivity of the sensor was 112.25μAμM−1, indicating an excellent sensitivity of the developed sensor. The sensor was successfully applied for the electrochemical determination of Bi3+ ions in environmental, pharmaceutical and biological samples.

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