CAJ | 학술논문

研究了柠檬酸钠改性沸石后其吸附水中低浓度氨氮、硝态氮、COD 等污染物的效果和吸附热力学、动力学特征，并通过比表面积与孔径分布测试、扫描电镜、X射线衍射手段测试分析了柠檬酸钠改性对沸石结构特征的影响结果。结果发现，天然沸石经柠檬酸钠改性后，其同步吸附3种污染物的效果有较大提高，其中对氨氮的去除率由53％上升到92％。对硝态氮的去除率由2％提升到10％、对COD的去除率由5％提高到35％。柠檬酸钠改性沸石后其对氨氮及COD的吸附符合Langmuir等温线，属于单层覆盖，而对硝态氮的吸附更符合Freundlich等温线。叶洛维奇吸附动力学方程在描述沸石吸附氨氮、硝态氮和 COD的吸附动力学上，更具有优越性，说明沸石对3种污染物的吸附均属于化学吸附。测试分析发现，柠檬酸钠改性沸石后其组分中钠元素含量增加，表面变得比较光滑、孔径和孔体积增大，但柠檬酸钠改性并没有改变沸石的晶体结构，主要是因为引入了钠离子以及柠檬酸根的酸性作用，提高了沸石的吸附能力。
연구료저몽산납개성비석후기흡부수중저농도안담、초태담、COD 등오염물적효과화흡부열역학、동역학특정，병통과비표면적여공경분포측시、소묘전경、X사선연사수단측시분석료저몽산납개성대비석결구특정적영향결과。결과발현，천연비석경저몽산납개성후，기동보흡부3충오염물적효과유교대제고，기중대안담적거제솔유53％상승도92％。대초태담적거제솔유2％제승도10％、대COD적거제솔유5％제고도35％。저몽산납개성비석후기대안담급COD적흡부부합Langmuir등온선，속우단층복개，이대초태담적흡부경부합Freundlich등온선。협락유기흡부동역학방정재묘술비석흡부안담、초태담화 COD적흡부동역학상，경구유우월성，설명비석대3충오염물적흡부균속우화학흡부。측시분석발현，저몽산납개성비석후기조분중납원소함량증가，표면변득비교광활、공경화공체적증대，단저몽산납개성병몰유개변비석적정체결구，주요시인위인입료납리자이급저몽산근적산성작용，제고료비석적흡부능력。
The removal efficiency to ammonia nitrogen,nitrate nitrogen,COD and characteristics of adsorption thermodynamics,kinetics of zeolite modified by sodium citrate was investigated.And using specific surface area and pore analysis,SEM-EDS,XRD and other means to characterize the structure.Results showed that,the synchronous removal efficiency of zeolite modified by sodium citrate to ammonia nitrogen,nitrate nitrogen, COD were 92%,10%,35%,which had respectively increased by 53%,2%,5% as that of the natural zeolite.The adsorption equilibrium data of ammonia nitrogen and COD on sodium citrate modified zeolite fitted well to the Langmuir,nitrate nitrogen fitted well to the Freundlich isotherm models.The adsorption kinetics data of am-monia nitrogen,nitrate nitrogen,COD on modified zeolite could be well described by elovich absorption kinetic equation .The result of EDS demonstrated that sodium can be loaded on the zeolite,and the average pore width, total pore volume increased after modified sodium citrate.But the crystal structure kept invariant.