Performance, optimization, and mechanism of nitric oxide removal by thiourea dioxide/FeIIEDTA reaction systems

doi:10.1016/j.cjche.2020.06.021

Abstract

Abstract: In this work, a new innovative absorption system containing both thiourea dioxide (TD) and Fe^ⅡEDTA was used to NO removal. The independently influences of O₂ volume concentration, TD concentration, original pH value and absorbent temperature on NO removal in bubbling device were examined preliminarily. The results revealed that the NO removal efficiency firstly increased and then decreased with the increasing of the three independent variables (O₂ volume concentration, TD concentration and temperature). However, the NO removal efficiency monotonously increased to some extent with pH value increasing from 6.5 to 10.5. In addition, the respective effects of the four variables and the interactive function of them on NO removal were checked with the response surface methodology (RSM) by central composite design (CCD). The calculative model showed that pH value possessed a main positive independent impact on NO removal. Furthermore, the interactive effects between any two factors were expounded by the 3D surface and counter plots. Finally, the optimum absorption conditions for the maximum NO removal at 94.3% experimentally and 95.8% statistically were obtained in O₂ volume content of 6.0%, TD concentration of 0.02 mol·L^-1, original pH value of 10.5 and absorption temperature of 42 ℃.

Key words: Nitric oxide, Thiourea dioxide, Fe^IIEDTA, RSM

摘要： In this work, a new innovative absorption system containing both thiourea dioxide (TD) and Fe^ⅡEDTA was used to NO removal. The independently influences of O₂ volume concentration, TD concentration, original pH value and absorbent temperature on NO removal in bubbling device were examined preliminarily. The results revealed that the NO removal efficiency firstly increased and then decreased with the increasing of the three independent variables (O₂ volume concentration, TD concentration and temperature). However, the NO removal efficiency monotonously increased to some extent with pH value increasing from 6.5 to 10.5. In addition, the respective effects of the four variables and the interactive function of them on NO removal were checked with the response surface methodology (RSM) by central composite design (CCD). The calculative model showed that pH value possessed a main positive independent impact on NO removal. Furthermore, the interactive effects between any two factors were expounded by the 3D surface and counter plots. Finally, the optimum absorption conditions for the maximum NO removal at 94.3% experimentally and 95.8% statistically were obtained in O₂ volume content of 6.0%, TD concentration of 0.02 mol·L^-1, original pH value of 10.5 and absorption temperature of 42 ℃.

关键词: Nitric oxide, Thiourea dioxide, Fe^IIEDTA, RSM

Feiqiang He, Xinyu Zhu, Xianchun Chen, Jianhua Ding. Performance, optimization, and mechanism of nitric oxide removal by thiourea dioxide/FeIIEDTA reaction systems[J]. Chinese Journal of Chemical Engineering, 2020, 28(11): 2918-2927.

Feiqiang He, Xinyu Zhu, Xianchun Chen, Jianhua Ding. Performance, optimization, and mechanism of nitric oxide removal by thiourea dioxide/FeIIEDTA reaction systems[J]. 中国化学工程学报, 2020, 28(11): 2918-2927.

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