华南农业大学学报2025，Vol.46Issue(2)：230-237,8.DOI:10.7671/j.issn.1001-411X.202403001
EDTA改性氮化碳吸附鱼塘中氨氮的性能及应用
Performance and application of EDTA modified carbon nitride in adsorbing ammonia nitrogen in fish ponds
摘要
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.关键词
EDTA/氮化碳/改性/氨氮/吸附Key words
EDTA/Carbon nitride/Modification/Ammonia nitrogen/Adsorption分类
化学化工引用本文复制引用
宁瑞翔,廖鑫,汤日元..EDTA改性氮化碳吸附鱼塘中氨氮的性能及应用[J].华南农业大学学报,2025,46(2):230-237,8.基金项目
广东省自然科学基金(2019B151502052) （2019B151502052）
河源市科技计划(河科2021039) （河科2021039）
