A comparative study on the self-cleaning behavior and antibacterial activity of Portland cement by addition of TiO 2 and ZnO nanoparticles

• Published in: Materials research express Vol. 8; no. 3; p. 35403
• Main Authors: Dehkordi, Bahzad Abasifard, Nilforoushan, Mohammad Reza, Talebian, Nasrin, Tayebi, Morteza
• Format: Journal Article
• Language: English
• Published: 01-03-2021
• ISSN: 2053-1591; 2053-1591
• DOI: 10.1088/2053-1591/abef41

In the present study, the photocatalytic effect of the addition of nano-TiO
2
/ZnO particles with different molar ratios of polyethylene glycol on the self-cleaning behavior and antibacterial activity of Portland cement was investigated to evaluate its potential for dye decolorization, and inactivation of
Escherichia coli
and
Streptococcus mutans
. Moreover, the effect of PEG addition on the hydration and tensile strength properties of the cement samples was evaluated. Furthermore, to study the self-cleaning behavior of the cement samples, an azo dye was selected as an organic pollutant. The modified cement samples were characterized using x-ray diffraction, Fourier-transform infrared spectroscopy, energy-dispersive x-ray spectroscopy, and scanning electron microscopy to assess the pozzolanic reactivity of the cement paste in the presence of TiO
2
and ZnO nanoparticles. The results showed that the bactericidal properties of the modified cement specimens were dependent on the hydration time and composition of the samples. Accordingly, the maximum inhibitory effect was observed for the specimens hydrated for 7 d. Additionally, the surface of the samples was able to effectively decompose the azo dye. This novel modified cement has a promising potential to be used as a self-cleaning and antibacterial coating for urban constructions.