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Fe II (EDTA) solution has been considered an efficient option in wet flue gas denitrification, whereas the generated Fe II (EDTA)−NO restricts its wide application, suggesting that Fe II (EDTA)−NO reduction is the key to this process. This work investigated the performance, kinetics, and mechanism of Fe II (EDTA)−NO reduction by Mn powder coupled with manganese ion (Mn 2+ ) recovery. We initially studied the performance of Fe II (EDTA)−NO reduction with respect to the major influencing factors (i.e., the particle size of Mn powder, initial Fe II (EDTA)−NO concentration, Mn powder concentration, stirring speed, and temperature). Shrinking core model and Arrhenius law were applied to illustrate the kinetics and mechanism between Fe II (EDTA)− NO solution and Mn powder, suggesting that the solid−liquid reaction was fitted on chemical reaction control, and the activation energy was calculated as 43.0 kJ mol −1 . The effects of main operating parameters, such as precipitant concentration, pH value, and temperature, were studied on Mn 2+ recovery. Results indicated that the pseudo-second-order model could precisely describe the kinetics of Mn 2+ recovery. Finally, according to Arrhenius and Eyring−Polanyi equations, the reaction activation energy, enthalpy of activation, and entropy of activation for Mn 2+ recovery were calculated as 17.25 kJ mol −1 , 14.55 kJ mol −1 , and 252.07 J (k mol) −1 , respectively.

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