We report a simple, direct, and green conversion of air/N to nitric acid by bubbling the gas through an aqueous solution containing 50 μM Fe ions. Air stone, along with ultrasonication, was employed to generate gas microbubbles. HO produced at the water-gas interface undergoes Fenton's reaction with Fe ions to produce OH that efficiently activates N, yielding nitric acid as the final product. Nitrate (NO) formation occurs without the use of any external electric potential or radiation. The concentration of NO increased linearly with time over a period of 132 h. The average NO production rate is found to be 12.9 ± 0.05 μM h. We envision that this nitrogen fixation strategy that produces nitric acid in an eco-friendly way might open the possibility for the energy-efficient and green production of nitric acid.
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