Abstract
A study of the mechanism by which bismuth is electrodissolved in an aqueous solution of thiourea on the background of H2SO4 demonstrated that, in the thiourea concentration range 0.001 M < c < 0.5 M, a current oscillation is observed in cyclic voltammograms at E ≈ 0.4–0.3 V when the potential is swept from the anodic to the cathodic region. This oscillation is due to the loosening of the passivating film formed in the anodic process. It is shown that thiourea is not oxidized to formamidine disulphide at the bismuth electrode. thiourea and formamidine disulphide have mutually opposite effects on the height of the cathodic peak: the peak current falls with increasing thiourea concentration and grows with increasing formamidine disulphide concentration. According to the results of an X-ray fl uorescence analysis, sulfur is formed on the bismuth electrode upon its prolonged polarization of in a 0.5 M solution of thiourea. An explanation is provided for the experimental facts observed in the study.
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Agrawal R. and Namboodhiri, T.K.G., Corros. Sci., 1990, vol. 30, pp. 37–52.
Bolzan, A.E., Wakenge, I.B., Piatti, R.C.V., et al., J. Electroanal. Chem., 2001, vol. 501, pp. 241–252.
Alodan, M. and Smyr, W., Electrochim. Acta, 1998, vol. 44, pp. 299–309.
Mohanty, U.S., Tripathy, B.C., Das, S.C., and Misra, V.N., Metall. Mater. Trans., 2005, vol. B36, pp. 737–741.
Bek, R.Yu. and Shevtsova, O.N., Russ. J. Electrochem., 2011, vol. 47, no. 9, pp. 1029–1034.
Shevtsova, O.N., Bek, R.Yu., Zelinskii, A.G., and Vais, A.A., Russ. J. Electrochem., 2006, vol. 42, no. 3, pp. 239–244.
Kozin, L.F., Kozina, S.A., and Bogdanova, A.K., Zashch. Met., 2005, vol. 41, no. 3, pp. 315–325.
Groenewald, T., J. Appl. Electrochem., 1975, vol. 5, pp. 71–78.
Zhang, H., Ritchie, I.M., and La Brooy, R.S., Hydrometallurgy, 2004, vol. 72, pp. 291–301.
Bolzan, A.E., Iwasita, T., and Arvia, A.J., J. Electroanal. Chem., 2003, vols. 554–555, pp. 49–60.
Tian, M. and Conway, B.E., J. Appl. Electrochem., 2004, vol. 34, pp. 533–543.
Bolzan, A.E., Piatti, R.C.V., and Arvia, A.J., J. Electroanal. Chem., 2003, vol. 552, pp. 19–34.
Garcia, G., Rodriguez, J.L., Lacconi, G.I., and Pastor, E., J. Electroanal. Chem., 2006, vol. 588, pp. 169–178.
Petrova, T.P., Starodubets, E.E., and Shapnik, A.M., Vestn. Kazan Tekhnol. Univ., 2012, vol. 7, pp. 182–185.
Petrova, T.P., Starodubets, E.E., and Shapnik, A.M., Vestn. Kazan Tekhnol. Univ., 2013, vol. 16, no. 8, pp. 266–271.
Preisler, P.W. and Berger, L., J. Am. Chem. Soc., 1947, vol. 69, pp. 322–325.
Brossard, R.L., Canad. J. Chem., 1984, vol. 62, no. 6, pp. 1112–1119.
Brossard, R.L., J. Electrochem. Soc., 1984, vol. 131, no. 8, pp. 1847–1849.
Nechiporuk, V.V., Tkachuk, M.M., and Yuz’kova, V.D., Russ. J. Electrochem., 2007, vol. 43, no. 9, pp. 1047–1054.
Khobotova, E.B. and Larin, V.I., Zh. Prikl. Khim., 1995, vol. 68, no. 3, pp. 416–420.
Bek, R.Yu., Shuraeva, L.I., Ovchinnikova, S.N., and Kenzin, V.I., Russ. J. Electrochem., 2007, vol. 43, no. 11, pp. 1260–1267.
Bek, R.Yu. and Shuraeva, L.I., Russ. J. Electrochem., 2006, vol. 42, no. 4, pp. 340–346.
Petrova, T.P., Starodubets, E.E., Borisevich, S.V., and Shapnik, A.M., Izv. Vyssh. Uchebn. Zaved., Khim. Khim. Tekhnol., 2012, vol. 55, no. 1, pp. 59–63.
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Original Russian Text © T.P. Petrova, E.E. Starodubets, A.M. Shapnik, 2014, published in Zhurnal Prikladnoi Khimii, 2014, Vol. 87, No. 1, pp. 52–57.
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Petrova, T.P., Starodubets, E.E. & Shapnik, A.M. Kinetics of electrode processes on a bismuth electrode in acid solutions containing thiourea and formamidine disulphide. Russ J Appl Chem 87, 48–53 (2014). https://doi.org/10.1134/S1070427214010078
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DOI: https://doi.org/10.1134/S1070427214010078