Abstract
There exists a great difference of the photocatalytic degradation efficiency between nanoscaled TiO2 modified-emulsified asphalt applied as the fog sealing under the indoor and outdoor environment. Much efforts have been made by many investigators to study this issue. However, most of them focus on the ideal condition, ignoring the degradation efficiency examination of TiO2 in the actual engineering practice. A series of field tests are carried out, accompanied with laboratory experiments, to analyze and consequently compare the photocatalytic degradation efficiency of nanoscaled TiO2 in the indoor and outdoor conditions, respectively. Regression analysis was employed to investigate the influence factors of degradation efficiency, by which formula of function of factors influencing degradation efficiency and degradation efficiency deviation equation are obtained. The results show that when the degradation efficiency of NO2 in the laboratory test is as high as 63%, the degradation efficiency affected by the environmental factors is only 25% in the actual engineering practice. Based on the measurement data, detection indicators and criteria can be provided, which is of great significance in the establishment of the construction quality control system.
Highlights
With the development of research on nanosized materials recently, their engineering applications have been widely expanded. e application of nanosized photocatalysis materials in water treatment, air purity, and other environmental protection fields has become a hot topic of social concern [1]
Du et al [4, 5] found that nanoscaled TiO2 photocatalytic materials would be able to degrade NOX, HC, CO, and other components included in automobile exhaust
Most aforementioned research studies are primarily concerned on the degradation efficiency of nano-TiO2 under an ideal condition of laboratory experiments, while rare attention has been paid to its actual application
Summary
With the development of research on nanosized materials recently, their engineering applications have been widely expanded. e application of nanosized photocatalysis materials in water treatment, air purity, and other environmental protection fields has become a hot topic of social concern [1]. The photocatalysts represented by nano-TiO2 can undergo strong redox reactions under UV radiation [2], which have been widely studied by domestic and foreign scholars for the degradation of automobile exhaust. Numerous investigations on the photocatalysts represented by nano-TiO2 adopted as the degradation of automobile exhaust have been carried out, owing to its characteristic of strong redox reactions exposed under UV radiation [3]. Most aforementioned research studies are primarily concerned on the degradation efficiency of nano-TiO2 under an ideal condition of laboratory experiments, while rare attention has been paid to its actual application. Erefore, to capture the physical process of TiO2 degradation and grasp a better understanding of the Advances in Materials Science and Engineering underlying mechanism, a series of comprehensive field tests accompanied with laboratory experiments are desired, which motivates this study. Main objectives of this paper are to comparing the degradation efficiency of atmospheric pollutants under both indoor and outdoor conditions, considering the photocatalytic process of TiO2 and its influencing factors, revealing the rule of the photocatalytic effect with influencing factors and exploring the mechanism that causes the deviation of degradation efficiency exposed to these two aforementioned environments. ese results are undoubtedly of great significance to improve degradation efficiency and beneficial to establish quality control systems in the construction
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