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, 2024, 45(0): 1-8. DOI: 10.7671/j.issn.1001-411X.202403001
    引用本文: 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, 2024, 45(0): 1-8. 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, 2024, 45(0): 1-8. DOI: 10.7671/j.issn.1001-411X.202403001
    Citation: 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, 2024, 45(0): 1-8. 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:
      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-C3N4),并采用乙二胺四乙酸二钠(2Na-EDTA)改性得到改性氮化碳(EDTA-s-C3N4)。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-C3N4的比表面积高达17.7012 m2/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24.2131mg/g。EDTA-s-C3N4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-C3N4对斑马鱼安全无毒。
      结论 EDTA-s-C3N4对鱼塘中氨氮有优良的清除效果,安全无毒,实用性好。

       

      Abstract:
      Objective To prepare modified carbon nitride withenhanced 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 by thermal condensation method, and then s-C3N4 was further modified by disodium ethylenediaminetetraacetic acid (2Na-EDTA) to obtain modified carbon nitride(EDTA-s-C3N4). Scanning electron microscope (SEM), X-ray diffraction (XRD), BETsurface area, and Zeta potential were used to characterize the materials.
      Result The specific surface area of EDTA-s-C3N4was as high as 17.7012 m2/g, and the surface potential was −19 mV. It had excellent adsorption performance for ammonia nitrogen in fish pondswith good 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 24.2131mg/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-C3N4was safe and non-toxic to zebrafish fish.
      Conclusion EDTA-s-C3N4 has good removal effect on ammonia nitrogen in fish ponds.Itis safe and non-toxic, and has good practicality.

       

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