中文摘要：

采用微乳技术制备纳米铁粒子，并在无氧环境、室温、中性条件下与NO3^-反应，研究纳米铁与硝酸盐反应的产物及反应机理，结果表明：纳米铁在30min内能与99％硝酸盐反应，反应的主要产物为氨氮，且伴有亚硝酸盐产生，亚硝酸盐氮的浓度在反应过程中出现极大值；由质量平衡关系推出，纳米铁与硝酸盐反应是氧化还原与吸附作用同时存在的过程，反应的主要路径为NO3→NO2^-→NH4^＋.

英文摘要：

To investigate chemical reduction of nitrate by nanoscale zero-valent iron （NZVI） in aqueous and related pathways for synthesizing iron nanoparticle which has a size in the range of 20nm. And under the experimental conditions NZVI removed mostly 99% of nitrate within a period of 30min. Nitrate removal was accompanied by [ NH4^＋] increase and [ NO2^-] undergo the process of from increase to decrease, note the maximum in the intermediate species [ NO2^- ] so assumed that the role of nanoscale iron in the nitrate reduction should be take part in two major processes： （a） directly participate in the redox reaction; and （b） adsorption of nitrate. And the path way NO3^-→NO2^- →NH4^＋ was proposed.