配位体对地下环境中Fe(Ⅱ)衰减硝基苯的强化作用

Ligand-Enhanced Nitrobenzene Attenuation Process in Subsurface Environment by Iron(Ⅱ)

通过静态实验研究了配位体对地下环境中Fe(Ⅱ)衰减硝基苯的影响。实验结果表明,配位体的种类、浓度均对Fe(Ⅱ)衰减硝基苯有重要影响。在Fe(Ⅱ)浓度为5mmol/L的条件下,以半胱氨酸为配位体形成的络合物对硝基苯衰减效果最好,对硝基苯的去除率为86.16%;在配位体浓度变化的条件下,配位体浓度为50mmol/L时,对硝基苯的衰减效果相对较好,去除率均在65%以上;另外,在Fe(Ⅱ)和配位体浓度一定的条件下,硝基苯的浓度对其衰减也有影响,100mg/L的硝基苯衰减效果最好,之后随着硝基苯浓度增加,衰减效果呈现逐渐变差的趋势;在Fe(Ⅱ)的络合物衰减硝基苯的过程中,Fe(Ⅱ)被氧化成Fe(Ⅲ)。

The effects of ligands on the attenuation of nitrobenzene by Fe（Ⅱ） in static experiment.Results indicated that the ligand species and concentration had significant effects on the attenuation of nitrobenzene.When Fe（Ⅱ） concentration was 5 mmol/L,the Fe（Ⅱ）-cysteine complexe had the best effect on nitrobenzene attenuation and the removal rate of nitrobenzene was 86.16%.The highest removal rate of nitrobenzene was above 65% when the concentration of ligands was 50 mmol/L;When the concentration of Fe（Ⅱ） and ligands was stable,the nitrobenzene concentration also had effects on its attenuation.The highest degradation rate was achieved at the nitrobenzene concentration of 100 mg/L and the degradation rate decreased as the increasing nitrobenzene concentration.In the process of nitrobenzene attenuation by Fe（Ⅱ）-complexe,the Fe（Ⅱ） was oxidated as Fe（Ⅲ）.