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.
出处
《环境化学》
CAS
CSCD
北大核心
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
关键词
硝酸盐
纳米铁
脱硝
nitrate, nanoscale iron, dinitrification.
作者简介
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