采用液相还原法制备出纳米粒子,粒径80nm左右。主要成分为α-Fe.试验研究了该粒子对不同浓度模拟污染地下水的脱硝效果及反应动力学.结果表明,自制纳米铁具有极高的活性,在无氧环境中,室温、中性条件下即可与NO3^-迅速反应.当模拟水样的NO3^--N初始浓度为30、50、80、120mg/L,纳米铁用量为4g/L时,剧烈振荡(250r/min)反应30min,即可获得90%以上的脱硝率.反应符合一级动力学方程,可描述为准一级反应.
The study on reduction of nitrate by synthesizing nanoscale iron particles was reported. The nanoscale iron particles with a diameter about 80 nm have high surface energies, removed mostly 30,50,80,120 mg N/L of nitrate within a period of 30 rain. Kinetics analysis from batch studies revealed that the reduction reaction with nanoscale iron appeared to be a pseudo first-order.