In industrialized societies, air pollution is a major concern due to its deleterious impacts on public health, the environment, and the economy. One major source of air pollution requiring appropriate precautions is nitrogen oxides-(NOx) emissions from urban and industrial areas. To reduce NOx gases in the atmosphere, the photocatalytic reaction stimulation on titanium dioxide (TiO2)-incorporated cement-based materials may prove to be a promising solution. Starting from this idea, this study was positioned on evaluating the effect of TiO2 substitution rates on the photocatalytic activity of TiO2-incorporated cement-based systems. To do this, a series of mixtures was prepared with four different TiO2 substitution rates (2.5%, 5%, 7.5%, and 10% by total weight of powder materials) and the water-to-powder ratio was fixed at 0.35 (by weight) for all mixtures. The photocatalytic activities of the mixtures were evaluated by conducting photocatalytic degradation tests. The compressive strength and electrical impedance of TiO2-incorporated cement-based systems were evaluated to assess the influence of the TiO2 substitution rate on some engineering properties of these systems. Tomographic imaging was also employed to assess the degree of dispersion of TiO2 particles within the cement-based matrix. According to the results, maximum electrical impedance and compressive strength results were obtained from 2.5% TiO2-substituted cement-based systems. The highest NOx degradation rates were achieved when the TiO2 substitution rate was 5% in the cement-based mixtures. Tomography imaging showed that when the substitution rate exceeded a certain threshold, the photocatalytic degradation capacity of the cement-based systems reduced due to the agglomeration of TiO2 particles. ORCID NO: 0000-0003-2104-5761
Anahtar Kelimeler: Air pollution, TiO2, Photocatalytic reaction, Nitrogen oxides, Substation rate
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