Haji Omid Kalte - Department of Occupational Health Engineering, Faculty of Medical Sciences, TarbiatModares University, Tehran, Iran
Ahmad Jafari Jonidi - Iran University of Medical science, Faculty of Health, Teharn, Iran
Hasan Asilian - Department of Occupational Health Engineering, Faculty of Medical Sciences, TarbiatModares University, Tehran, Iran
Ardalan Soleymanian - Department of Occupational Health Engineering, Faculty of Medical Sciences, TarbiatModares University, Tehran, Iran

Nitrogen oxides are one of the most important air pollutants in environment and industrythat due to the adverse health and environmental effects should be refined before discharging into the environment. The photocatalytic oxidation method of nitrogen oxide into nitrogen Dioxide for better absorption insolutions is a promising method for removing of nitrogen oxides. Laboratory system used in this study is included of a source of gas source, mixing chamber, photocatalytic oxidation reactor, measuring system for nitrogen oxidation. Zinc oxide nanoparticles which were simulated by UV-A radiation would be used for photocatalytic oxidation. Inlet concentration of nitrogen oxide and the amount of stabilized nanoparticles in reactor for converting nitrogen oxide into nitrogen dioxide has been investigated. Results showed that the amount of monotonic converting of nitrogen oxide into nitrogen dioxide in the amount of Nano-particles is stabilized ۸mg/cm۲ for inlet concentration ۱۰۰,۱۵۰,۲۰۰ ppm and respectively equivalent to ۱۵, ۲۶ and ۳۲%. This study showed that increasing concentration of inletnitrogen oxide in system, reduce the capacity of photocatalytic oxidation for converting nitrogen oxide into nitrogen dioxide.Nitrogen oxides are one of the most important air pollutants in environment and industrythat due to the adverse health and environmental effects should be refined before discharging into the environment. The photocatalytic oxidation method of nitrogen oxide into nitrogen Dioxide for better absorption insolutions is a promising method for removing of nitrogen oxides. Laboratory system used in this study is included of a source of gas source, mixing chamber, photocatalytic oxidation reactor, measuring system for nitrogen oxidation. Zinc oxide nanoparticles which were simulated by UV-A radiation would be used for photocatalytic oxidation. Inlet concentration of nitrogen oxide and the amount of stabilized nanoparticles in reactor for converting nitrogen oxide into nitrogen dioxide has been investigated. Results showed that the amount of monotonic converting of nitrogen oxide into nitrogen dioxide in the amount of Nano-particles is stabilized ۸mg/cm۲ for inlet concentration ۱۰۰,۱۵۰,۲۰۰ ppm and respectively equivalent to ۱۵, ۲۶ and ۳۲%. This study showed that increasing concentration of inletnitrogen oxide in system, reduce the capacity of photocatalytic oxidation for converting nitrogen oxide into nitrogen dioxide.

Photocatalyticoxidation, Zinc oxide nanoparticles, Nitrogen oxide