Abstract. Results of automated measurements of the catalytic activity of bismuth coatings in the photodegradation reaction of an aqueous solution of a model pollutant are presented. The measurements were carried out with the help of a developed installation, in which the photoreaction and measurement cells are combined. Strontium bismuth nanosized powders synthesized by the pyrolytic method using sorbitol as an organic precursor, were deposited on a ceramic carrier as one-, four-, and seven-layer coatings. The effectiveness of photocatalytic coatings was assessed by the rate of decrease in the concentration of the organic methylene blue dye after prolonged irradiation by visible and ultraviolet light. The photocatalytic activity of strontium bismuthate-based coatings are shown to depend on the multiplicity of their deposition on the ceramic carrier. The high discreteness of the kinetic measurements revealed various stages of the photocatalytic process: sorption in the dark, photo-sorption, photocatalysis at a constant speed, the stage of slowing down the photocatalytic decomposition by reducing the concentration of methylene blue.

Keywords: measuring installation, photocatalysis, photocatalytic coatings, photometry, kinetics, degree of conversion

References:

1. Kryukov A.I., Stroyuk A.L., Kuchmiy S.Ya., Pokhodenko V.D. Nanofotokataliz (Nanophotocatalysis), Kiev, 2013, 618 р. (in Russ.)
2. Artem’yev Yu.M., Ryabchuk V.K. Vvedeniye v geterogennyy fotokataliz (Introduction to Heterogeneous Photocatalysis), St. Petersburg, 1999, 304 р. (in Russ.)
3. Li X., Zheng R., Luo Q., Wang D., An J., Yin R., Liu Y., Wu D., Han X. Applied Surface Science, 2015, vol. 356, рр. 941–950. DOI 10.1016/j.apsusc.2016.10.003 0169-4332.
4. Gao X., Wang Z., Zhai X., Fu F., Li W. Journal of Molecular Liquids, 2015, vol. 211, рр. 25–30. DOI 10.1016/j.molliq.2015.06.058.
5. Li R., Gao X., Fan C., Zhang X., Wang Y., Wang Y. Applied Surface Science, 2015, vol. 355, рр. 1075–1082. DOI 10.1016/j.apsusc.2015.07.175.
6. Liao X., Chen J., Wang M., Liu Z., Ding L., Li Y. Journal of Alloys and Compounds, 2016, vol. 658, рр. 642–648. DOI 10.1021/jp1122823.
7. Alekseyev I.S., Miklis N.I. Vestnik of Vitebsk State Technological University, 2013, no. 24, pp. 23–25. (in Russ.)
8. He Y.M., Wu Y., Sheng T.L., Wu X.T. J. Hazard. Mater., 2010, vol. 180, рр. 675–682. DOI 10.1016/j.jhazmat.2010.04.091.
9. Lamba R., Umar A., Mehta S.K., Kansal S.K. Journal of Alloys and Compounds, 2015, vol. 653, рр. 327–333. DOI^ 10.1016/j.jallcom.2015.08.220.
10. Shtarev D.S., Shtareva A.V., Zaytsev A.V. Ecological Bulletin of Research Centers of the Black Sea Eco-nomic Cooperation, 2014, no. 4, pp. 88–92. (in Russ.)
11. Makarevich K.S., Zaitsev A.V., Kaminsky O.I., Kirichenko E.A., Astapov I.A. International Journal of Chemical Engineering, 2018, vol. 2018, ID 4715629. DOI 10.1155/2018/4715629.
12. Zheng J.-Q., Zhu Y.-J., Xu J.-S., Lu B.-Q., Qi C., Chen F., Wu J. Materials Letters, 2013, vol. 100, рр. 62–65. DOI: 10.3390/app9010055.
13. Yu W., Liu X., Pan L., Li J., Liu J., Zhang J., Li P., Chen C., Sun Z. Applied Surface Science, 2014, vol. 319, рр. 107–112. DOI: 10.1016/j.apsusc.2014.07.038.
14. Makarevich K.S., Zaytsev A.V., Kaminskiy O.I., Pyachin S.A., Astapov I.A. Fizika: fundamental’nyye i prikladnyye issledovaniya, obrazovaniye (Physics: Fundamental and Applied Research, Education), Proceedings of the XV regional scientific conference, Blagoveshchensk, 2017, рр. 107–110. (in Russ.)