纳米铁的制备及其还原硝酸盐氮的产物与机理  

PREPARATION OF NANOSCALE IRON FOR REDUCTION OF NITRATE PRODUCT AND MECHANISMS

作　　者：李铁龙[1] 康海彦[1] 刘海水[1] 刘振英[1] 王薇[1] 金朝晖[1] 

机构地区：[1]南开大学环境科学与工程学院,天津300071

出　　处：《环境化学》2006年第3期294-296,共3页Environmental Chemistry

基　　金：国家自然科学基金(批准号:20477019)资助项目

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NO-3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30m in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NO-3→NO2-→NH+4.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.

关 键 词：硝酸盐 纳米铁 脱硝 

分 类 号：X132[环境科学与工程—环境科学]