Photo- and thermal catalysis of nitrate to nitrite by manganese ions under light up to 600 nm

We report a catalytic system using manganese ion (Mn²⁺) for the photo- and thermal reduction of nitrate (NO₃^-) to nitrite ions, in the presence of organic compounds, under ultraviolet and visible light irradiation up to 600 nm. This method enables NO₃^- reduction utilizing long-wavelength light and a novel Mn²⁺ catalytic system.