The effect of sulfur- and carbon-codoped TiO2 nanocomposite on the photocatalytic and mechanical properties of cement mortars

Authors

DOI:

https://doi.org/10.15587/1729-4061.2020.210218

Keywords:

nanocomposite, titanium dioxide, cement mortar, photocatalysis, hydrophobicity, free energy

Abstract

This study has established the impact of a nano-ТіО2 P25 modifier and a nanocomposite based on titanium dioxide, doped with sulfur and carbon dioxide (ТіО2/S,C), on the photocatalytic, mechanical properties and the structural formation of cement mortars. The paper reports the results of the particle size distribution of the Portland composite cement and the ТіО2 nano additives; a comprehensive assessment of the particle size distribution has been performed both in terms of volume and specific surface. It has been proven that the ТіО2/S,C nanocomposite is characterized by the extremely high surface activity, which determines the photocatalytic properties of the surface of cement mortars. The comparison of the mechanical properties of cement mortars modified by titanium dioxide nano additives has been carried out.

An experimental study has confirmed the improved photocatalytic properties of the cement mortar surface in the visible spectrum through the doping of the nano-sized titanium dioxide with carbon and sulfur. A combination of the ТіО2 nano additives and the superplasticizers of polycarboxylate type leads to the increased strength of the modified samples in proportion to a hardening age. Given the high surface activity of the ТіО2/S,C nanocomposite's particles, the cement paste hydration products deposit at their surface, thereby forming such conglomerates with them that seal the microstructure of the cement matrix. It has been shown that using a nanocomposite based on the modified titanium dioxide decreases the indicators of free energy while the surface of the cement mortar acquires hydrophobic properties, which contributes to the processes of self-cleaning. Thus, there is a reason to argue about the feasibility of using the ТіО2/S,C nanocomposite to improve the photocatalytic, self-cleaning, mechanical, and hydrophobic properties of cement mortars

Author Biographies

Marko Hohol, Lviv Polytechnic National University S. Bandery str., 12, Lviv, Ukraine, 79013

Postgraduate Student

Department of Building Production

Myroslav Sanytsky, Lviv Polytechnic National University S. Bandery str., 12, Lviv, Ukraine, 79013

Doctor of Technical Sciences, Professor, Head of Department

Department of Building Production

Tetiana Kropyvnytska, Lviv Polytechnic National University S. Bandery str., 12, Lviv, Ukraine, 79013

PhD, Associate Professor

Department of Building Production

Adriana Barylyak, Danylo Halytsky Lviv National Medical University Pekarska str., 69, Lviv, Ukraine, 79010

PhD, Associate Professor

Department of Therapeutic Dentistry

Yaroslav Bobitski, Lviv Polytechnic National University S. Bandery str., 12, Lviv, Ukraine, 79013

Doctor of Technical Sciences, Professor, Head of Department

Department of Photonics

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Published

2020-08-31

How to Cite

Hohol, M., Sanytsky, M., Kropyvnytska, T., Barylyak, A., & Bobitski, Y. (2020). The effect of sulfur- and carbon-codoped TiO2 nanocomposite on the photocatalytic and mechanical properties of cement mortars. Eastern-European Journal of Enterprise Technologies, 4(6 (106), 6–14. https://doi.org/10.15587/1729-4061.2020.210218

Issue

Vol. 4 No. 6 (106) (2020): Technology organic and inorganic substances

Section

Technology organic and inorganic substances

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Copyright (c) 2020 Marko Hohol, Myroslav Sanytsky, Tetiana Kropyvnytska, Adriana Barylyak, Yaroslav Bobitski

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