Application of "Ion Imprinted" Polyaniline Electrode Column Modulated by Potential in the Analysis of Anions
CHEN Zhi-dong,LI Xue-ying,KONG Yong,QIN Yong(Institute of Petrochemical Technology,Changzhou University,Changzhou 213164,China)
Polyaniline(PAn) was synthesized by chemical oxidation using Cl-as the doping anions,and then it was packed into a porous ceramic tube as conductive stationary phase to fabricate an electrode column which was used as the working electrode of a three-electrode system.A potential of-0.6 V was applied on the electrode column to make PAn in its reduction state,and thus Cl-was de-doped from the PAn backbone.Cavities complementary to Cl-in three dimensional space were left in PAn to form "ion imprinted" PAn electrode column.Effects of various experimental factors on the de-doping amount of Cl-were investigated,and the optimal conditions for de-doping were using a potential of-0.6 V,a dedoping time of 4 000 s and a pH value of 4.0.When different mobile phases containing F-,Cl-,Br-,SO2-4and H2PO-4 flew through the electrode column,a potential of +0.6 V was applied on this column.The different kinds of anions in the mobile phases were doped into the PAn backbone because of the reversible doping/de-doping property of PAn.The "Cl-imprinted" PAn electrode column has the maximum affinity to Cl-based on the mechanism of molecular imprinting,and its affinity to the other anions decreased with the increase of the anions radii.The cyclic voltammograms of the "ion imprinted" PAn in electrolytes containing different anions also showed a similar trend.Therefore,PAn was expected to be used as the stationary phase controlled by electrochemistry.
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