CAJ | 학술논문

由于水中硝酸盐污染的普遍性、难去除性和对人体健康的潜在危害性而引起人们的广泛关注.通过批实验,考察了不同阳离子(Fe~(2+)、Fe~3和Cu~(2+))对Fe~0还原硝酸盐的影响.结果表明,由于加入阳离子可直接或间接地增加溶液中的Fe~(2+)而都能促进硝酸盐的还原,作用顺序为Fe~(3+)> Fe~(2+)> Cu~(2+);Fe~(2+)对硝酸盐的还原具有重要作用,并随着反应的进行,转化为铁氧化物附着在铁表面而降低铁的活性;硝酸盐还原的主要产物为氨氮,亚硝酸盐只在反应初期有少量积累,尤其是加Cu~(2+)的体系中,但随后都很快降低;在所有体系中,检测到的三氮(NO_3~- -N、NO_2~- -N和NH_4~+ -N)之和只占理论总氮的51.5%～82.6%;动力学分析表明,硝酸盐的还原在不加阳离子的体系中更符合一级反应,而加了阳离子的处理更符合Lo-gistic模型.本研究结果阐明了Fe~(2+)对Fe~0还原硝酸盐的重要性.
유우수중초산염오염적보편성、난거제성화대인체건강적잠재위해성이인기인문적엄범관주.통과비실험,고찰료불동양리자(Fe~(2+)、Fe~3화Cu~(2+))대Fe~0환원초산염적영향.결과표명,유우가입양리자가직접혹간접지증가용액중적Fe~(2+)이도능촉진초산염적환원,작용순서위Fe~(3+)> Fe~(2+)> Cu~(2+);Fe~(2+)대초산염적환원구유중요작용,병수착반응적진행,전화위철양화물부착재철표면이강저철적활성;초산염환원적주요산물위안담,아초산염지재반응초기유소량적루,우기시가Cu~(2+)적체계중,단수후도흔쾌강저;재소유체계중,검측도적삼담(NO_3~- -N、NO_2~- -N화NH_4~+ -N)지화지점이론총담적51.5%～82.6%;동역학분석표명,초산염적환원재불가양리자적체계중경부합일급반응,이가료양리자적처리경부합Lo-gistic모형.본연구결과천명료Fe~(2+)대Fe~0환원초산염적중요성.
Since nitrate contamination in water is very universal, hard removal and potential harm to people,it attracts extensive attention. Batch tests were conducted to investigate the effects of cation (Fe~(2+) , Fe~(3+) and Cu~(2+)) on nitrate reduction by zero-valent iron (Fe~0). The results demonstrated that three cations significantly accelerated nitrate reduction in the order Fe~(3+) > Fe~(2+) > Cu~(2+) , because they increased ferrous ion in the solution directly or indirectly. Ferrous ion was very important for nitrate reduction and converted to iron oxides covered on the surface of iron grains, which decreased the reactivity of Fe~0. Ammonia was the major end-product of nitrate reduction. Nitrite accumulated in the original period of reaction, especially in the system added Cu~(2+),but subsequently it decreased rapidly. In the all systems containing Fe0, the sum of three nitrogen (NO_3~- -N,NO_2~- -N and NH_4~+ -N) determinated in solution was only 51.5% ～ 82.6% comparing with theoretic total nitrogen. Kinetics analysis revealed that the denitrification reaction without adding cation appeared to be a pseudofirst-order model, but it was consistent with logistic model when cation was introduced. The research may lead to understand the importance of Fe~(2+) for nitrate reduction by Fe~0.