CAJ | 학술논문

以钛基氧化物涂层材料(IrO_2,RuO_2,TiO_2 / Ti)为阳极,石墨为阴极,考察了氨氮的直接电化学氧化与其在两种液相电解质体系下(存在氯离子与否)的氧化效果.检测了氨氮氧化过程中亚硝态氮和硝态氮的生成量.结果表明,当不存在氯离子时NH_4~+-N的电化学氧化可被忽略,但游离态氨氮(NH_3-N)在约1.25V阳极电位下可发生直接氧化.当电解质中存在氯离子时,有效氯的生成使氨氮的氧化效率显著提高,在碱性体系下氨氮的去除作用包括间接电化学氧化和直接电化学氧化,但以前者为主.在两种电解质体系下均有少量硝态氮生成,而亚硝态氮仅在无氯离子体系下有少量生成.硝态氮和亚硝态氮的存在说明部分氨氮可能发生了非有效氯的间接氧化.本研究表明氨氮的电化学氧化机理与介质条件、阳极电位密切相关.
이태기양화물도층재료(IrO_2,RuO_2,TiO_2 / Ti)위양겁,석묵위음겁,고찰료안담적직접전화학양화여기재량충액상전해질체계하(존재록리자여부)적양화효과.검측료안담양화과정중아초태담화초태담적생성량.결과표명,당불존재록리자시NH_4~+-N적전화학양화가피홀략,단유리태안담(NH_3-N)재약1.25V양겁전위하가발생직접양화.당전해질중존재록리자시,유효록적생성사안담적양화효솔현저제고,재감성체계하안담적거제작용포괄간접전화학양화화직접전화학양화,단이전자위주.재량충전해질체계하균유소량초태담생성,이아초태담부재무록리자체계하유소량생성.초태담화아초태담적존재설명부분안담가능발생료비유효록적간접양화.본연구표명안담적전화학양화궤리여개질조건、양겁전위밀절상관.
The direct electrochemical oxidation of ammonia nitrogen and its electrochemical oxidation effect in two aqueous electrolytes with/without chloride ion were investigated by using IrO_2, RuO_2 and TiO_2/Ti as anode and graphite as cathode. The content of nitrite nitrogen and nitrate nitrogen produced in the electrochemical oxidation of ammonia nitrogen were determined. The results show that the electrochemical oxidation of NH_4~+-N in the electrolyte without chloride ion could be neglected, but the direct electrochemical oxidation of free NH_3~-N could take place when anodic potential is about 1.25 V. The present of chloride ion in electrolyte leads to the formation of effective chlorine, which could greatly enhance the oxidation efficiency of ammonia nitrogen, and in alkaline electrolyte, both indirect and direct electrochemical oxidation may account for the removal of ammonia nitrogen, but predominant mechanism is the former. The low content of nitrate nitrogen in above two aqueous electrolytes as well as the nitrite nitrogen in the electrolyte without chloride ion only were found, which indicate that the indirect oxidation of ammonia nitrogen caused by other species besides effective chlorine may be occurred. The study shows that the oxidation mechanism of ammonia nitrogen has close relation with electrolytic medium and anodic potential.