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Selective photo-reduction of nitrate to nitrogen with a two-step process by a KBH4/Cu(II) modified CuFe2O4 photocatalyst by Li Cai; Jinrui Guo; Ting Liu; Jing Tian; Zhaoli Wang; Yong Liu; Mohamed S. Hamdy; Xuping Sun is a Materials Science article available to read on EtoBox.

What is Selective photo-reduction of nitrate to nitrogen with a two-step process by a KBH4/Cu(II) modified CuFe2O4 photocatalyst about?

Nitrate (NO 3 -) removal by photochemical-reduction has received extensive attention. However, the low selectivity of NO 3 reduction to N 2 hinders the application of this technology. In this study, a novel Cu@Fe-Cu-CuFe 2 O 4-x photocatalyst was prepared by modifying CuFe 2 O 4 with KBH 4 and Cu(II), and used to selectively reduce NO 3 -to N 2 with a two-step reduction process. In step (1), with Cu@Fe-Cu-CuFe 2 O 4-x /ultraviolet (UV) system, 91.0% NO 3 -was reduced to 52.3% NO 2 -and 39.4% N 2 within 60 min. The rapid removal of NO 3 -was due to the synergistic effect of oxygen vacancies, Fe-Cu corrosion cell, and CuFe 2 O 4 photocatalysis. In step (2), H 2 C 2 O 4 and H 2 O 2 were introduced into the effluent of step (1) to promote CO 2 • -formation via Fe(II) and Fe(III) catalysis and UV radiation, which boosted the selective reduction of NO 2 -to N 2 . When H 2 C 2 O 4 and H 2 O 2 dosages were both 4.0 mmol•L -1 and the reaction time was 30 min, the removal efficiency of NO 2 -achieved 100% and the selectivity of N 2 was 83.0%. Overall, the two-step reduction process achieved 95.0% NO 3 -removal efficiency and 90.1% N 2 selectivity with initial NO 3 -concentration of 30 mg•N•L

Who reads Selective photo-reduction of nitrate to nitrogen with a two-step process by a KBH4/Cu(II) modified CuFe2O4 photocatalyst?

Author

Li Cai; Jinrui Guo; Ting Liu; Jing Tian; Zhaoli Wang; Yong Liu; Mohamed S. Hamdy; Xuping Sun

Publisher

Springer Science and Business Media LLC

Published

2023

Language

EN

Field

Materials Science (Physical Sciences)