Abstract
An electrochemically induced bismuth iodine oxide/multiwalled carbon nanotubes/polyvinyl alcohol (BiOI/MWCNTs/PVA) composite membrane electrode with iodide ion trap (I−-trap) was fabricated by prerelease of I− under reduction potential. The I−-trap BiOI/MWCNTs/PVA composite membrane with unique lattice confinement structures was used for the selective extraction of I− in an electrochemically switched ion permselective (ESIP) process. In the ESIP system, the direct uptake and release of I− were realized by applying a cell voltage-pulse potential (CV-PP) coupling circuit on the membranes to switch the oxidation/reduction state. The I−-trap BiOI/MWCNTs/PVA composite membrane exhibited a maximum flux of 8.32 mg·m−2·min−1 and superior electrochemical stability. The separation factors of I−/Br−, I−/Cl−, I−/NO3−, and I−/SO42−in the mixed solutions were 2.67, 3.71, 3.82, and 6.70 respectively. Therefore, such a novel I−-trap BiOI/MWCNTs/PVA composite membrane could be used in the ESIP system for the selective extraction of I− ions from low concentration solutions.
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