Abstract
The purpose of this study was to analyze the effect of titanium dioxide (TiO2) on reducing nitrogen oxide (NOx) concentrations using the statistical method of the Anderson-Darling test. To compare and analyze this effect, a spray-type form of TiO2 was applied to the asphalt pavement surface on urban roads. Data acquisition for NOx concentration was collected from a test section with TiO2 applied and a reference section without TiO2 applied. The probabilities of occurrence of the NOx concentration in the test and reference section were estimated and compared using the Anderson-Darling test. In sum, most of the NOx concentrations were probabilistically lower in the test section. The average probability of the NOx concentration in the test section in the ‘low’ range was 46.2% higher than in the reference section. In the ‘high’ and ‘moderate’ ranges, the average probability of the NOx concentration compared to that of the reference section was lower by 28.1% and 18.8%, respectively. These results revealed that the photochemical reaction from the TiO2 material applied on asphalt pavement was effective in reducing NOx.
Highlights
IntroductionMost notably among air pollution issues is the widely discussed social issue regarding the increase of particulate matter concentrations to a serious level due to migration from neighboring countries and seasonal effects
The steady growth in economic conditions and the rapid increase in the economic growth of neighboring countries in the past several decades have led to an accelerated degree of air pollution in South Korea
In order to analyze the effect of TiO2 on reducing nitrogen oxide (NOx) concentration, a full-scale testbed was constructed at an underpass section
Summary
Most notably among air pollution issues is the widely discussed social issue regarding the increase of particulate matter concentrations to a serious level due to migration from neighboring countries and seasonal effects. Air pollutants emitted into the atmosphere can be the source of secondary pollutants that are further converted into particulate matter through chemical reactions [1]. PM2.5 consists of pollutants containing heavy metals, sulfur dioxide (SO2), nitrogen oxide (NOx), lead (Pb), ozone (O3), and carbon monoxide (CO). They can be generally produced through chemical reactions that combine SO2 and NOx from fossil fuel combustion and vehicle emissions with water vapor and ozone. Since NOx is a main source of generating PM2.5 on urban roads, the technology development for reducing NOx concentration is crucial
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