改性纳米零价铁去除水中莠去津

Removal of Atrazine in Wastewater Using Modified Nanoscale Zero-Valent Iron

[目的]研究改性纳米铁对水中莠去津的去除效果。[方法]采用液相还原法合成、并运用TH-904对纳米零价铁进行改性,采用SEM、TEM等手段对其进行表征及分析。[结果]改性纳米零价铁具有核壳结构,粒度分布均匀。当莠去津质量浓度为25.0 mg/L,改性纳米零价铁投加量为100 mg/L,pH值为4,20℃时,莠去津去除率可达70%以上。[结论]溶液pH值显著影响莠去津的去除,酸性条件有利其去除。纳米铁投加量和反应时间在一定范围内对莠去津的去除影响明显。

[Aims] The aim of this paper is to study the effect of modified nanoscale zero-valent iron（nZVI） on atrazine removal in wastewater. [Methods] The nanoscale zero-valent iron was prepared by borohydride reduction method and modified by TH-904. The iron nanoparticles were characterized by SEM and TEM. The effects of the dosages of modified Nzvi, pH and reaction time on atrazine removal was investigated. [Results] The iron nanoparticles had a core-shell structure and the particle size distribution were uniform. The removal efficiencies were more than 70% when the initial atrazine concentrations of 25 mg/L, the dosage of modified nZVI of 100 mg/L, pH of 4 at 20℃ . [Conclusions] Atrazine removal was strongly influenced by pH of solution. The lower pH can promote the atrazine removal. The dosage of modified nZVI and reaction time affect the reduction of atrazine remarkably in a certain range.