科研之友
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摘要
In this work, a new composite film electrode based on Dawson-type polyoxometalate alpha(2)-K7P2VW17O62 center dot 18H(2)O (P2W17V) and accessory copper oxide nanoparticles (CuO NPs) with a composite of carbon nanotubes (CNTs) was successfully proposed and employed for iodate (IO3-) analysis. Highly stable determination of IO3- was achieved by a combination of cyclic voltammetric and chronoamperometric methods performed on this layer-by-layer (LbL) self-assembly composite film electrode. For the tricomponent composite film, the amperometric response time of iodate (defined as the time to achieve 95% steady-state current) was estimated to be 2 s, confirming the faster electron transfer rate in the tricomponent composite film. This iodate sensor with 10 bilayers has a linear range of 1.25 x 10(-7) to 1.63 x 10(-4) M, a low detection limit of 1.5 x 10(-8) M (S/N = 3), a high sensitivity of 4.82 mA mM(-1) IO3- and an excellent anti-interference performance. In addition, the composite film could also be applied to detect iodate in table salt. The as-prepared sensor can be used for detecting iodate with a good average recovery of 100.1%, indicating the well reliability of the present sensor for iodate determination in table salts. This approach may open a new path for the rational design of high-performance tricomponent composite film electrochemical sensors.
