Performance and application of EDTA modified carbon nitride in adsorbing ammonia nitrogen in fish ponds

NING Ruixiang; LIAO Xin; TANG Riyuan

doi:10.7671/j.issn.1001-411X.202403001

Journal of South China Agricultural University > 2025 > 46(2): 230-237. > DOI: 10.7671/j.issn.1001-411X.202403001

NING Ruixiang, LIAO Xin, TANG Riyuan. Performance and application of EDTA modified carbon nitride in adsorbing ammonia nitrogen in fish ponds[J]. Journal of South China Agricultural University, 2025, 46(2): 230-237. DOI: 10.7671/j.issn.1001-411X.202403001

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Performance and application of EDTA modified carbon nitride in adsorbing ammonia nitrogen in fish ponds

College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China

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Received Date: March 01, 2024
Available Online: September 12, 2024
Published Date: September 17, 2024

Graphical Abstract

Abstract

Abstract

Objective
To prepare modified carbon nitride with enhanced performance in adsorbing ammonia nitrogen in fish ponds.
Method
Carbon nitride (s-C₃N₄) with basic adsorption capacity was prepared by co-heating of melamine and sodium bicarbonate using the thermal condensation method, and then s-C₃N₄ was further modified by disodium ethylene diamine tetraacetic acid (EDTA-2Na) to obtain modified carbon nitride (EDTA-s-C₃N₄). Scanning electron microscope (SEM), X-ray diffraction (XRD), BET surface area, and Zeta potential were used to characterize the materials.
Result
The specific surface area of EDTA-s-C₃N₄ was as high as 17.7012 m²/g, and the surface potential was −19 mV. It had excellent adsorption performance for ammonia nitrogen in fish ponds with the removal rate of 72% at pH=7.5. The adsorption process conformed to quasi-second-order kinetics, and the maximum adsorption capacity estimated by Langmuir isothermal model fitting was 24.2131 mg/g. After five cycles of regeneration, EDTA-s-C₃N₄ still had a removal rate of 60% for ammonia nitrogen. The toxicity evaluation proved that EDTA-s-C₃N₄ was safe and non-toxic to zebrafish.
Conclusion
EDTA-s-C₃N₄ has good removal effect on ammonia nitrogen in fish ponds. It is safe and non-toxic, and has good practicality.
- EDTA,
- Carbon nitride,
- Modification,
- Ammonia nitrogen,
- Adsorption

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References (25)

References

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Performance and application of EDTA modified carbon nitride in adsorbing ammonia nitrogen in fish ponds