Abstract
Hydroxyl radical (OH-) is one of the most important reactive intermediates in the atmosphere, playing a crucial role in atmospheric chemistry and global atmospheric chemistry processes. OH- is the major oxidizing species and is the main oxidant in the removal of air pollutants in the atmosphere. The aim of this study was to investigate the use of heterogeneous reaction combined with photocatalytic oxidation of OH- for the removal of gaseous pollutants from the atmosphere. The results showed that the hydroxyl radical scavenging agents (HRSA) had high hydroxyl radical scavenging activity and could effectively prevent the formation of secondary pollutants. The HRSA could also effectively scavenge oxygen radicals such as peroxide (H2O2), superoxide (O2-•) and nitrate radicals (NO3-•). In addition, the HRSA had a significantly greater adsorption capacity than traditional absorbent materials, meaning that the HRSA could be used as a more cost-effective air pollution control measure. This study also showed that the photocatalytic oxidation of OH- was more effective in the removal of gaseous pollutants when used in combination with the pioneering HRSA. In conclusion, the HRSA combined with photocatalytic oxidation was an effective method of gaseous pollutant removal from the atmosphere.
Introduction
Atmospheric pollution has become a major concern in recent years due to the deleterious effects of air pollutants on human health and the environment. One of the primary sourcesof hazardous air pollutants (HAPs) is combustion by-products released into the atmosphere. These toxins can cause a variety of health-related issues including respiratory illness and cancer. In order to mitigate these harmful toxins, effective methods of controlling atmospheric pollution must be developed. One of the most promising techniques is the use of heterogeneous reactions combined with photocatalytic oxidation of hydroxyl radicals (OH-) for the removal of gaseous pollutants from the atmosphere.
Hydroxyl radicals (OH-) are highly reactive species which oxidise a variety of water contaminants. They are the major oxidants responsible for the direct removal of air pollutants and the formation of secondary pollutants. OH- radicals are also known to play a major role in the degradation of pollutants in the atmosphere. As such, the utilization of OH- radicals for the removal of pollutants from the atmosphere has been explored in recent years. In order to achieve more efficient pollutant removal, hydroxyl radical scavenging agents (HRSA) have been developed in an effort to reduce OH- levels in the atmosphere.
HRSA are compounds which selectively scavenge or absorb OH- radicals and prevent their reactivity with other compounds. By selectively reducing the levels of OH- radicals in the atmosphere, these agents can effectively reduce the formation of secondary pollutants. Furthermore, recent studies have shown that HRSA have a higher adsorption capacity than traditional absorbent materials, potentially making them a more cost-effective means of air pollution control.
Effects of HRSA on Air Pollution Control
This study aims to explore the use of hydroxyl radical scavenging agents (HRSA) in combination with photocatalytic oxidation for the removal of gaseous pollutants from the atmosphere. The effects of the HRSA on gaseous pollutant removal from the atmosphere was evaluated using pollutant gases produced from a combustion sources. Pollutant removal efficiency was calculated by comparison of pollutant concentrations before and after the application of the HRSA.
The results of the study showed that the HRSA had a significant impact on the removal of the pollutants from the atmosphere, significantly reducing the concentration of the pollutants compared to before the HRSA was applied. Furthermore, the HRSA was also effective in scavenging oxygen radicals such as peroxide (H2O2), superoxide (O2-•) and nitrate radicals (NO3-•). The adsorption capacity of the HRSA was also significantly greater than that of traditional absorbent materials, suggesting that they could be used as a cost-effective air pollution control measure.
The HRSA was also shown to be highly effective when combined with photocatalytic oxidation, resulting in an even greater removal of pollutants from the atmosphere. The photocatalytic oxidation process suffers from the limitation of Inherent sink competition, whereby the reaction pathways quickly become saturated. However, the addition of the HRSA has the potential to extend the reaction pathway, allowing for a greater removal of gaseous pollutants.
Conclusion
The study have shown that the combination of hydroxyl radical scavenging agents (HRSA) and photocatalytic oxidation of OH- is an effective method of gaseous pollutant removal from the atmosphere. The HRSA had a significant impact on the removal of pollutants, significantly reducing the concentration of pollutants compared to before the application of the HRSA. The HRSA also had a significantly greater adsorption capacity than traditional absorbent materials, suggesting that they could be used as a cost-effective air pollution control measure. The HRSA was even more effective when combined with photocatalytic oxidation, resulting in an even higher removal of pollutants from the atmosphere. In conclusion, the HRSA combined with photocatalytic oxidation is effective method of gaseous pollutant removal from the atmosphere.
