Abstract
The NOx degradation performance of nano-TiO2 as a coating material for the road environment was evaluated in this research. The nano-TiO2 coating materials for both road surface and roadside were prepared by using anatase nano-TiO2, activated carbon powder, silane coupling agent and deionized water. The impact of varying amounts of coating material and silane coupling agent were evaluated. The road environment of NOx degradation was simulated by the photocatalytic test system designed by the research team. For the road surface coating, the photocatalytic degradation experiments of NO under different radiation intensities were carried out. The results show that the material has good photocatalytic degradation performance, and the proper amount of silane coupling agent can enhance the bonding performance of the material and asphalt mixture. For the roadside coating, sodium dodecylbenzene sulfonate was selected as the surfactant to carry out the photocatalytic degradation experiment of NO2 with different dosages of surfactant. The results showed that when the mass ratio of nano-TiO2 and surfactant was about 1:2, the catalytic degradation effect of the material was the best.
Highlights
A scanning electron microscope (SEM) was used to observe the nano particles and it found that only the size larger than 5 μm clumps can be observed, which indicated that the nano particles were agglomerated together during the transport and storage process, and which could affect the photocatalytic efficiency [24]
A photocatalytic test system with controllable environmental parameters that can simulate the whole process of the photocatalytic reaction was developed in this research
The photocatalytic degradation effect of nano-TiO2 road surface and roadside coating materials under different amounts of silane coupling agent and different UV irradiation intensities were evaluated based on the field measured automobile exhaust gas concentration
Summary
Automobile exhaust is one of the most serious sources of air pollution, which can cause serious harm to both humans and the ecological environment, and which has become more and more serious with the increasing number of motor vehicles [1,2,3]. Chen et al studied the influence of N-doped TiO2 as a photocatalyst coating on asphalt pavement on the degradation of automobile exhaust and evaluated the photocatalysis and durability of N-doped TiO2 photocatalytic asphalt pavement materials [28]. Mendoza et al analyzed and compared the efficiency of photocatalytic nano-TiO2 and WO3/TiO2 coating on the urban green infrastructure with different structural configurations (natural zeolite and permeable concrete block) for NOx purification [31]. Shen et al used a new method to prepare a kind of super smooth surface photocatalytic concrete [33], and found that the pollutants on its surface can be washed away by rainwater This new type of concrete shows great potential in the self-cleaning facing materials of urban buildings.
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