A Sensor for Determination of Trace Cr(Ⅵ)in Water Environment by Electrical-Control Adsorption Stripping Voltammetry Based on Polypyrrole Nanocomposites Functionalized ITO
By combining with the electronically controlled adsorption capacity of reduced graphene oxide(RGO)and gold nanoparticles/polypyrrole(AuNPs/Ppy)composites,a novel electrochemical sensor(RGO/AuNPs/Ppy-ITO)that can replace traditional solid(gold,glass carbon)electrodes has been constructed.Based on its advantages of low background current of ITO glass,no polishing pretreatment,etc.,it was used to measure trace Cr(Ⅵ)in the water environment.Besides,the large nitrogen content structure on the modified electrode surface and the electronically controlled adsorption effect under positive potential were used to record the reduction peak curve of Cr(Ⅵ)through differential pulse dissolution voltammetry.Under the conditions of optimized pH,enrichment voltage and time,a good linear relationship was measured between the Cr(Ⅵ)reduction peak current and the detection concentration range within 1-1 500 μg/L.The correlation coefficient R2=0.9973,and the detection limit was 0.83 μg/L.In comparison to the test results of gold electrode,it not only avoids the shortcomings of poor reproducibility due to the unstable surface state of the gold electrode,but also has higher sensitivity and lower cost consumables,and presents broad application potential in on-site rapid and trace detection of Cr(Ⅵ)in water environments.
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