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Photocatalytic Activity of Titanium Dioxide Immobilized in Polyacrylamide Hydrogels with Different Degrees of Crosslinking

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Abstract

Composite filamentary hydrogels based on cross-linked polyacrylamide, filled with TiO2 particles, were synthesized. The degree of crosslinking of the hydrogel matrix was set by the molar ratio of the cross-linking agent and monomer: 1 : 50, 1 : 100, 1 : 200, or 1 : 300. The diffusion of Methyl Orange dye in the polymer matrix as a function of the degree of crosslinking was studied by spectrophotometry, and the diffusion coefficient was calculated: 1.4 × 10–6, 1.8 × 10–6, 3.4 × 10–6, and 4.8 × 10–6 cm2 s–1, respectively. The photocatalytic activity of the composite hydrogels toward UV-induced degradation of a model dye, Methyl Orange, was studied. The effective rate constants of the photocatalytic degradation of the dye under the action of polyacrylamide/TiO2 composite hydrogels and aqueous TiO2 suspensions were determined. The presence of the hydrogel polymer matrix reduces the photocatalytic activity of TiO2 particles compared to the aqueous suspension containing the same amount of the particles. The photocatalytic activity of both aqueous TiO2 suspension and polyacrylamide/TiO2 composite hydrogel linearly depends on the total amount of TiO2 particles in the system.

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ACKNOWLEDGMENTS

The authors are grateful to Cand. Sci. (Chem.) M.S. Valova for measuring the band gap of the TiO2 sample using the equipment of the Center for Shared Use Synthesis and Analysis of Organic Compounds, Institute of Organic Synthesis, Ural Branch, Russian Academy of Sciences.

Funding

The study was financially supported by the Russian Foundation for Basic Research within the framework of research project no. 19-33-60015.

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Authors and Affiliations

  1. Yeltsin Ural Federal University, 620002, Yekaterinburg, Russia

    R. R. Mansurov, A. P. Safronov, S. D. Chernyuk & V. S. Zverev

  2. Institute of Electrophysics, Ural Branch, Russian Academy of Sciences, 620016, Yekaterinburg, Russia

    A. P. Safronov

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  1. R. R. Mansurov
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  2. A. P. Safronov
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  3. S. D. Chernyuk
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  4. V. S. Zverev
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Correspondence to R. R. Mansurov.

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Additional information

Translated from Zhurnal Prikladnoi Khimii, No. 6, pp. 690–698, January, 2021 https://doi.org/10.31857/S0044461821060025

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Mansurov, R.R., Safronov, A.P., Chernyuk, S.D. et al. Photocatalytic Activity of Titanium Dioxide Immobilized in Polyacrylamide Hydrogels with Different Degrees of Crosslinking. Russ J Appl Chem 94, 706–714 (2021). https://doi.org/10.1134/S1070427221060021

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