Abstract
It is a challenge to maintain Fenton’s oxidizability under alkaline conditions to efficiently oxidize nitric oxide (NO). Here, we find that an efficient catalyst goethite (α-FeOOH) to generate •OH is formed in an alkaline Fenton system and propose an in situ reactive oxygen species (ROS, hydroxyl radical (•OH) and hydroperoxyl anion (−OOH)) utilization mechanism in the high-gravity-enhanced α-FeOOH-catalyzed oxidation of NO within a rotating packed bed (RPB). A mathematical model is derived to elucidate the mechanism and evaluate the synergistic effect of ROS. The simulation results show that the generation and utilization sites of •OH gradually overlap in the liquid film with the increase in rotating speed. Additionally, the formation and properties of α-FeOOH are characterized to show its high dispersity in the RPB. Based on the mechanism, an in situ HiGee-AOP NO removal process is developed. Experimentally, the NO removal efficiency of the process can exceed 95% under optimal conditions.
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