Automobile Exhaust Removal Performance of Pervious Concrete with Nano TiO2 under Photocatalysis

Abstract

The urban environment is facing serious problems caused by automobile exhaust pollution, which has led to a great impact on human health and climate, and aroused widespread concern of the government and the public. Nano titanium dioxide (TiO2), as a photocatalyst, can be activated by ultraviolet irradiation and then form a strong REDOX potential on the surface of the nano TiO2 particles. The REDOX potential can degrade the automobile exhaust, such as nitrogen oxides (NOx) and hydrocarbons (HC). In this paper, a photocatalytic environmentally friendly pervious concrete (PEFPC) was manufactured by spraying nano TiO2 on the surface of it and the photocatalytic performance of PEFPC was researched. The nano TiO2 particle size, TiO2 dosage, TiO2 spraying amount, and dispersant dosage were selected as factors to investigate the efficiency of photocatalytic degradation of automobile exhaust by PEFPC. Moreover, the environmental scanning electron microscope (ESEM) was used to evaluate the distribution of nano TiO2 on the surface of the pervious concrete, the distribution area of nano TiO2 was obtained through Image-Pro Plus, and the area ratio of nano TiO2 to the surface of the pervious concrete was calculated. The results showed that the recommended nano TiO2 particle size is 25 nm. The optimum TiO2 dosage was 10% and the optimum dispersant dosage was 5.0%. The photocatalytic performance of PEFPC was best when the TiO2 spraying amount was 333.3 g/m2. The change in the photocatalytic ratio of HC and NOx is consistent with the distribution area of nano TiO2 on the surface of the pervious concrete. In addition, the photocatalytic performance of PEFPC under two light sources (ultraviolet light and sunlight) was compared. The results indicated that both light sources were able to stimulate the photocatalytic performance of PEFPC. The research provided a reference for the evaluation of automobile exhaust removal performance of PEFPC.

A review of the effect and optimization of use of nano-TiO2 in cementitious composites

“…In addition, application of nano-TiO2 photocatalysis on cement-based materials in urbanized areas can lead to air pollution reduction and air quality improvement in these areas [39,[45][46][47]. It has been found that concentration of organic, such as volatile organic compounds, and inorganic pollutants, such as NOx and SO2, can be reduced with the use of nano-TiO2 [19,29,36,[38][39][40]44,45,[47][48][49][50]. Such functionalities have the potential to improve the sustainability of construction materials [45].…”

“…Titanium dioxide is a noncombustible and odorless powder that has been produced abundantly and used frequently in various productions [21][22][23][24] because of its high chemical stability, non-toxicity, low cost, anticorrosion, electrical and superior photocatalytic property [22,23,[25][26][27]. It exists in three different phases; brookite, rutile and anatase [23,24,[27][28][29]. Although most of the TiO2 used up to date was not in nanosize state, trends to use titania nanoparticles has increased significantly and is expected to even exceed the use of conventional titanium dioxide in the few following years [26].…”

The influence of pulse modulated UV LEDs of different wavelengths on the photocatalytic degradation of atmospheric toluene and NO

“…Due to law regulations on mercury lamps in the EU and other nations and a steady price drop in ultraviolet emitting diodes (UVEDs) with wavelengths in the UVA range, fluorescent tube emitters vanish more and more from the European market and get replaced by LEDs (Office P. VERORDNUNG, 2008). As the fluorescent tubes will soon no longer be available, photocatalysis projects must switch to UVED as irradiation sources (Muramoto et al, 2014;Mittal et al, 2019;Luo et al, 2020).…”

A Review on the Application of Nanocellulose in Cementitious Materials

“…Nanomaterials, such as nano-silica [ 1 , 2 ], nano-TiO 2 [ 3 , 4 ], and carbon nanotubes (CNTs) [ 5 , 6 ], have been widely used in cementitious materials. However, with the development of our society, more and more attention from researchers is given to renewable and sustainable nanomaterials.…”