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纳米铁去除水中硝酸盐的动力学研究

Keywords: 纳米铁,硝酸盐,反应动力学方程,反应速率常数,活化能

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Abstract:

实验中采用了液相还原法制备新型吸附剂纳米铁。在纳米铁低投放量的条件下,采用间歇实验,分别从初始硝酸盐浓度、溶液pH值和温度的不同外界条件下研究了纳米铁对硝酸盐的去除情况。实验结果表明,硝酸盐初始浓度对反应速率有影响,但对去除率影响不大;溶液pH值为2.0时纳米铁对硝酸盐的去除效果最好;随着温度的升高,纳米铁对硝酸盐的去除率有所增加。以t时刻已反应掉的硝酸盐浓度为切入点,提出拟二级动力学方程。进而确定不同温度下的反应速率常数k。实验中k在50℃时最大,为0.014mg/(L·min)。反应活化能Ea为17.18kJ/mol,该反应以质量传递为控制因素。溶液中性条件下硝酸盐氮的还原产物为氨氮。

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