Applied Chemical Engineering

Photocatalytic simultaneous removal of nitrite and ammonia via zinc ferrite/N-doped graphene catalyst

Jia Ye

School of Chemistry, Biology and Materials Engineering, Suzhou University of Science and Technology

Shouqing Liu

Jiangsu Key Laboratory of Environmental Functional Materials

DOI: https://doi.org/10.24294/ace.v4i2.1344

Keywords: ZnFe2O4/NG, Nitrite, Ammonia Nitrogen, Photocatalysis, Simultaneous Removal

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Abstract

Zinc ferrite/N-doped graphene catalysts were synthesized by hydrothermal reaction. The synthesized materials were characterized by XRD, TEM, Raman and UV-VIS-DRS. We explored the photocatalytic simultaneous removal of nitrite and ammonia via zinc ferrite/N-doped graphene as the photocatalyst. The effects of Ph, amount of catalyst, N-doped graphene content, and initial concentration of ammonia on photocatalytic removal of nitrite and ammonia were examined. The results show that the removal ratio of nitrite–N and ammonia–N is 90.95% and 62.84% respectively， when the dosage of ZnFe₂O₄/NG (NG 5.0 wt%) is 1.5 g·L^-1 and the initial concentrations of nitrite–N 50 mg·L^-1，ammonia–N 100 mg·L^-1 with pH 9.5 under anaerobic conditions upon white light irradiation for 3 h. After the solution is aerated for 30 mins and irradiated for 10 h under aerobic conditions, the removal ratios of nitrite–N，ammonia–N and total nitrogen are 92.04%, 89.44% and 90.31% respectively. The complete removal of nigrogen is done.

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