Abstract
A ternary heterosystem consisting of crystalline graphitic carbon nitride, zinc oxide, and zinc sulfide (g-C3N4/ZnO/ZnS) was obtained by the one-stage decomposition of a mixture of thiourea and zinc acetate. The integral toxicity index of the resulting material was estimated in a luminescent test with a genetically modified Escherichia coli strain as a test object. The effect of quenching the luminescence of E. coli was noted both under exposure to UV radiation due to photocatalytic reactions on the surface of g-C3N4/ZnO/ZnS leading to the formation of highly oxidative radical ions interacting with cell membranes and without irradiation due to mechanical interactions with bacterial cells. At a 0.3 g/L concentration of g-C3N4/ZnO/ZnS in aqueous solution, the toxicity index T reached 75.6% under UV irradiation. In this case, an increase in the toxicity index T of the ternary heterosystem in a test concentration range from 0.1 to 0.3 g/L was 6 or 10–11% under UV radiation or without illumination, respectively, as compared with that of the pure graphite-like carbon nitride obtained under identical conditions.
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ACKNOWLEDGMENTS
We are grateful to D.V. Zhigulin for analyzing the structure of the samples by scanning electron microscopy and to Professor V.V. Uglov for performing the X-ray diffraction analysis of the samples.
Funding
These studies were carried out within the framework of the State Research Program of the Republic of Belarus “Materials Science, New Materials, and Technologies” 1.4.
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Translated by V. Makhlyarchuk
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Chubenko, E.B., Baglov, A.V., Dudchik, N.V. et al. Estimation of the Integral Toxicity of Photocatalysts Based on Graphitic Carbon Nitride in a Luminescent Test. Kinet Catal 63, 166–171 (2022). https://doi.org/10.1134/S002315842202001X
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DOI: https://doi.org/10.1134/S002315842202001X