Synergistic Effects of a Combination of Vacuum Ultraviolet–Induced Oxidation and Wet Absorption Process on Removal of Nitric Oxide at Room Temperature
Publication: Journal of Environmental Engineering
Volume 147, Issue 10
Abstract
Removal of low concentration NO in enclosed space by a new combined process incorporating vacuum ultraviolet (VUV)-induced oxidation and wet absorption process at room temperature was studied. Effects of NO initial concentration, gas flow rate, and humidity on NO conversion in the VUV irradiation process were first investigated. Subsequently, the absorption aqueous solutions were optimized, and the inhibitor was used in the wet absorption process in order to absorb the generated . The results demonstrated that NO conversion was increased with the decreasing initial concentration and gas flow rate, and moreover, humidity had a promoting effect on NO oxidation because of the generation of hydroxyl radicals (·OH) under VUV irradiation. solution was favorable for the absorption of , and the NOx conversion can reach 85% at the initial stage, while it was decreased to 25% after 20 min absorption for the rapid free radical chain reaction nature between and NOx. In addition, the inhibitor was chosen to suspend the presented rapid reaction, the removal efficiency of NOx was increased with the augment of the concentration, and it can be stabilized at 85% even after 4 h reaction with the concentration of 1.5%.
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Data Availability Statement
No data, models, or code were generated or used during the study.
Acknowledgments
This research was supported by the National Natural Science Foundation of China (22076224 and 21677179), the Guangdong Basic and Applied Basic Research Foundation (2020A1515010865), the Research Fund Program of Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality (GHML2021-601), the Fundamental Research Funds for the Central Universities (20lgjc03), the Open Fund of Guangdong Province Engineering Laboratory for Air Pollution Control (2019323609-01), and a fund from the Hunan Construction Engineering Group (K20-38000-030).
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Published In
Journal of Environmental Engineering
Volume 147 • Issue 10 • October 2021
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© 2021 American Society of Civil Engineers.
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Received: Mar 20, 2021
Accepted: May 13, 2021
Published online: Jul 29, 2021
Published in print: Oct 1, 2021
Discussion open until: Dec 29, 2021
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