Electrochemical synthesis and using for electroanalysis of polyaniline / polycarbazol copolymer in dichloromethane solution

In this study, electrochemical synthesis of the carbazole homopolymer and carbazole - aniline copolymer films were synthesized on the Pt electrode in CH2Cl2 by potentiodynamic method for the first time and optimum conditions were determined. The characterization of the synthesized films was carried out by using some methods, such as cyclic voltammetry, FT-IR, Raman, UV-vis, SEM and EDS. In the second part of the study, electrochemical behavior of the films was examined using cyclic voltammetry in aqueous solution containing NaHSO4 / Na2SO4 (pH 2,0- 6,5) and the optimum condition was determined as to be the pH 4,0. Electroanalysis of hydroquinone with amperometric I - t method (0,40 V to 0,60 V) was successfully performed using these modified electrodes. The best analytical data (limit of detection (LOD) , limit of quantification (LOQ), linear range and regression coefficients (R2) were calculated as to be 2,43x10-4 mM, 8,08x10-4 mM, 8,08x10-4 -85,0 mM and 0,9982 respectively) in optimum conditions (pH 4,0 and 0,55 V) was obtained by the use of PC- PANI film. The results were compared with uncoated Pt electrode. The reusability of films was tested in the optimum conditions in which the best analytical results were obtained. Determination of HQ in the presence of phenolic compounds containing hydroxyl group using polluted river water samples with HQ, phenol-HQ, catechol-HQ and fenol-catechol-HQ was carried out and high satisfactory recovery values were obtained. Also reusability of PC-PANI film was tested. According to the first measured current, after the first two usages of the modified electrode, change in currents was insignificant, but after the third use, a regular decrease in currents was determined and in the twentieth use the current was decreased approximately 50%. The analytical results were compared with similar modified electrodes in the literature. Keywords: Polycarbazole, polyaniline, copolymers, amperometry, hydroquinone.