{"title":"Simultaneous oxidation removal of NO and SO2 in simulated flue gas stream via a UV-light/composite oxidant system","authors":"Yan Wang , Zihan Xiao , Xinyu Gao , Yangxian Liu","doi":"10.1016/j.psep.2025.106971","DOIUrl":null,"url":null,"abstract":"<div><div>In this work, an ultraviolet light (UV-light)/composite oxidant oxidation system based on an impinging stream absorber has been constructed, and then used for synchronously removing NO and SO<sub>2</sub> in simulated flue gas. The influences of process variables on NO/SO<sub>2</sub> oxidation processes, removal mechanisms, enhancement mechanisms, and macro-kinetics were studied. This system constructed can realize superior simultaneous desulfurization and denitrification efficiency owing to the synergistic effects of composite oxidant under far lower reagent and smaller energy consumption. The simultaneous removal efficiency of 98.9 % for NO and 100 % for SO<sub>2</sub> was achieved in the UV-light/composite oxidant oxidation system, far exceeding the systems induced via a single oxidant. The concentrations of H<sub>2</sub>O<sub>2</sub> and S<sub>2</sub>O<sub>8</sub><sup>2-</sup>, operation temperature, and solution pH value have a dual influence on the NO removal efficiency, and the optimized values are 0.1 mol/L, 0.1 mol/L, 60℃ and 2.48, respectively. The utilization rate of free radicals in liquid phase is greatly improved owing to the interaction between the two oxidants, which is attributed to the crucial role of H<sub>2</sub>O<sub>2</sub> as a free radical capture intermediate in this system. For the NO removal, oxidation via hydroxyl radical played the most key role and oxidation via sulfate free radical played a second key role. Oxidation by peroxides played a significant role in SO<sub>2</sub> removal. The NO absorption process in the UV-light/composite oxidant oxidation system was determined to be a pseudo-first-order rapid reaction kinetic characteristic.</div></div>","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"197 ","pages":"Article 106971"},"PeriodicalIF":7.8000,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Process Safety and Environmental Protection","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0957582025002381","RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
In this work, an ultraviolet light (UV-light)/composite oxidant oxidation system based on an impinging stream absorber has been constructed, and then used for synchronously removing NO and SO2 in simulated flue gas. The influences of process variables on NO/SO2 oxidation processes, removal mechanisms, enhancement mechanisms, and macro-kinetics were studied. This system constructed can realize superior simultaneous desulfurization and denitrification efficiency owing to the synergistic effects of composite oxidant under far lower reagent and smaller energy consumption. The simultaneous removal efficiency of 98.9 % for NO and 100 % for SO2 was achieved in the UV-light/composite oxidant oxidation system, far exceeding the systems induced via a single oxidant. The concentrations of H2O2 and S2O82-, operation temperature, and solution pH value have a dual influence on the NO removal efficiency, and the optimized values are 0.1 mol/L, 0.1 mol/L, 60℃ and 2.48, respectively. The utilization rate of free radicals in liquid phase is greatly improved owing to the interaction between the two oxidants, which is attributed to the crucial role of H2O2 as a free radical capture intermediate in this system. For the NO removal, oxidation via hydroxyl radical played the most key role and oxidation via sulfate free radical played a second key role. Oxidation by peroxides played a significant role in SO2 removal. The NO absorption process in the UV-light/composite oxidant oxidation system was determined to be a pseudo-first-order rapid reaction kinetic characteristic.
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