Removal of NO in flue gas simulated by the Fe<sup>2+</sup>/Cu<sup>2+</sup>-activated double oxidant system
Creators: name: Yan, Wenchao
name: Qi, Guisheng
name: Gao, Yusong
name: Guo, Da
name: Jiao, Weizhou
name: Liu, Youzhi
Publisher: name: Taylor & Francis
Year: 2022
Subjects: Biophysics
Biochemistry
Physical Sciences not elsewhere classified
Environmental Sciences not elsewhere classified
Chemical Sciences not elsewhere classified
Biological Sciences not elsewhere classified

description: ⋅OHThe wet denitrification technology has a good development prospect due to its simple system and mild reaction conditions, and related research has become a hot topic in the field of flue gas purification. In this work, a novel simultaneous removal technology of NO from flue gas using Fe<sup>2+</sup>/Cu<sup>2+</sup>-catalytic H<sub>2</sub>O<sub>2</sub>/(NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub> system was developed for the first time. The feasibility of this new flue gas cleaning technology was explored through a series of experiments and performance analyses. The mechanism of oxidation products, free radicals and simultaneous removal of NO was revealed. The effects of the main process parameters on the removal of NO were investigated. Relevant results demonstrated that the removal efficiency of NO was elevated when the concentration of (NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub> or reacting temperature increased, while it was decreased after increasing the raising of Fe<sup>2+</sup>, Cu<sup>2+</sup> and H<sub>2</sub>O<sub>2</sub> concentrations. The main radicals were and·SO4−, using the electron spin resonance technique in the solution, and played a very important role in NO removal. The main products were carried out by ion chromatography and elemental N material accountancy, and the results showed that it was sulfate and nitrate in the solution, which provided theoretical guidance for the subsequent treatment and resource utilization of the absorption solution. The results of the study provided a theoretical basis for the industrial application of wet denitrification. <b>Highlights</b>A new green process of NO removal by a wet process with Fe<sup>2+</sup>/Cu<sup>2+</sup> activated (NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub> system is proposed in this paper;Elimination mechanisms and paths of NO are elucidated;The synergistic role produced by Cu<sup>2+</sup> and Fe<sup>2+</sup> is beneficial to the purification of NO;The synergistic role produced by (NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub> and H<sub>2</sub>O<sub>2</sub> increased the concentration of free radicals in the solution;This process jointly considers the enhanced removal of NO and recycling of transition metal ions. A new green process of NO removal by a wet process with Fe<sup>2+</sup>/Cu<sup>2+</sup> activated (NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub> system is proposed in this paper; Elimination mechanisms and paths of NO are elucidated; The synergistic role produced by Cu<sup>2+</sup> and Fe<sup>2+</sup> is beneficial to the purification of NO; The synergistic role produced by (NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub> and H<sub>2</sub>O<sub>2</sub> increased the concentration of free radicals in the solution; This process jointly considers the enhanced removal of NO and recycling of transition metal ions.