Electrochemical Preparation of Polyaniline Coatings Doped with Bronsted Acid for Solid Phase Microextration and Their Extraction Capability
Polyaniline(PANI) coatings were prepared on the surface of platinum wires by cyclic voltammetry in 0.1-0.2 mol/L aniline solutions containing different bronsted acids (H2SO4, HCl, HNO3, HClO4 and H3PO4). The microstructure of resulted fibers was characterized by SEM, and the extraction capability was estimated by gas chromatography using 7 aromatic compounds as models under selected conditions (0.35 g/mL NaCl; extract 30 min under 50 ℃). It was found that PANs prepared in HNO3 and HClO4 solutions exhibited uniform porous structure and their extraction efficiency was higher for all models. PANI fibers with expected extraction capability thus may be fabricated by simply selecting suitable bronsted acid as supporting electrolyte.