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

作　　者：宁瑞翔 廖鑫 汤日元 NING Ruixiang;LIAO Xin;TANG Riyuan(College of Materials and Energy,South China Agricultural University,Guangzhou 510642,China)

机构地区：[1]华南农业大学材料与能源学院,广东广州510642

出　　处：《华南农业大学学报》2025年第2期230-237,共8页Journal of South China Agricultural University

基　　金：广东省自然科学基金(2019B151502052);河源市科技计划(河科2021039)。

摘　　要：【目的】制备对鱼塘氨氮有优良吸附性能的氮化碳。【方法】通过热缩聚法将三聚氰胺和碳酸氢钠共热制备得到具有基础吸附能力的氮化碳(s−C_(3)N_(4)),并采用乙二胺四乙酸二钠(EDTA−2Na)改性得到改性氮化碳(EDTA−s−C_(3)N_(4))。采用扫描电子显微镜(Scanning electron microscope,SEM)、X射线衍射(X-ray diffraction,XRD)、BET比表面积、Zeta电位等对材料进行表征。【结果】EDTA−s−C_(3)N_(4)的比表面积高达17.7012 m^(2)/g,表面电势为−19 mV,对鱼塘中氨氮有优良的吸附性能,pH=7.5时氨氮去除率达72%。吸附过程符合准二级动力学,Langmuir等温模型拟合估算的最大吸附容量为24.2131 mg/g。EDTA−s−C_(3)N_(4)经过5次循环再生后对氨氮的去除率仍达60%。毒性评价表明EDTA−s−C_(3)N_(4)对斑马鱼安全无毒。【结论】EDTA−s−C_(3)N_(4)对鱼塘中氨氮有优良的清除效果,安全无毒,实用性好。【Objective】To prepare modified carbon nitride with enhanced performance in adsorbing ammonia nitrogen in fish ponds.【Method】Carbon nitride(s-C_(3)N_(4))with basic adsorption capacity was prepared by coheating of melamine and sodium bicarbonate using the thermal condensation method,and then s-C_(3)N_(4) was further modified by disodium ethylene diamine tetraacetic acid(EDTA-2Na)to obtain modified carbon nitride(EDTA-s-C_(3)N_(4)).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-C_(3)N_(4) was as high as 17.7012 m^(2)/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-C_(3)N_(4) still had a removal rate of 60%for ammonia nitrogen.The toxicity evaluation proved that EDTA-s-C_(3)N_(4) was safe and non-toxic to zebrafish.【Conclusion】EDTA-s-C_(3)N_(4) 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 

分 类 号：TQ424.29[化学工程]