Sevastopol, Sevastopol, Russian Federation
Sevastopol, Russian Federation
from 01.01.2022 to 01.01.2024
The paper presents the results of the study of photocatalytic activity under visible light of highly dispersed tungsten oxide powder WO3 obtained as a result of recycling of carbide products. Microstructural analysis of the tungsten oxide powder using scanning electron microscopy (SEM) before and after the photocatalysis process was performed. Test results of physical and mechanical properties (density, compressive strength, water absorption, total porosity) of cement matrix with different content of WO3 powder (1-5 wt.%) are presented. Preliminary analysis of the modified surface for self-cleaning properties was carried out. Subject: Cement matrix modified by photocatalyst based on highly dispersed tungsten oxide powder WO3. Materials and methods: Highly dispersed tungsten oxide powder (average particle size 40 to 200 nm) was used as a photocatalyst. Photocatalytic activity of WO3 powder was evaluated by determining the degree of degradation of model organic pollutant methylene blue with a concentration of 15 mg/L by photometric analysis of the solution using the device “Expert 003” at a wavelength of 654 nm. The microstructure of tungsten oxide powder was investigated on a PHENOM proX scanning electron microscope. Portland cement CEM II/A-P 42.5H SS was used for the fabrication of cement matrices with photocatalyst. Physical and mechanical properties of cement samples were determined according to standard methods of GOST 30744-2001, GOST 30744-2001. Results: The results showed that the photocatalytic activity of tungsten oxide powder increases with increasing its concentration in solution and time of irradiation with visible light. The maximum degradation of 89% dye, was observed when 5.0 g/l WO3 powder was added, 180 min after the start of the reaction. Addition of tungsten oxide powder to cement matrix leads to increase in density, compressive strength, decrease in water absorption and total porosity. Visual analysis of organic dye discoloration on the surface of the modified cement matrix is presumably related to the self-cleaning ability of the surface due to the photocatalytic properties of tungsten oxide. Conclusions: The use of highly dispersed tungsten oxide powder in cement matrices has great potential to create self-cleaning building materials with improved physical and mechanical properties as well as the ability to decompose polluting organic substances under the influence of visible light.
photocatalysis, highly dispersed powder, tungsten trioxide, cement material, self-cleaning, strength
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