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
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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+.Abstract: 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.
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Key words:
- nitrate /
- nanoscale iron /
- dinitrification
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