磁性纳米Fe-S复合材料的制备及其对Cr(Ⅵ)的处理性能研究

通过"一步法"制备了磁性纳米Fe-S复合材料,测试其粒径分布,并用X-射线衍射(XRD)和傅里叶红外光谱(FT-IR)等对其结构进行表征,初步探讨磁性纳米Fe-S复合材料组成,研究了pH值、添加量和盐对磁性纳米Fe-S复合材料处理Cr(Ⅵ)性能的影响。结果表明磁性纳米Fe-S复合材料是由四氧化三铁(Fe3O4)和硫化亚铁(FeS)复合而成的材料,平均粒径为284.8 nm,磁分离性好;磁性纳米Fe-S复合材料对Cr(Ⅵ)有较好的吸附还原处理效果,添加量为20 mg/L,处理浓度为2 mg/L的Cr(Ⅵ)废液30 min即可达到去除率98%以上;且磁性纳米Fe-S复合材料在酸性体系中处理性能好于碱性体系;盐对磁性纳米Fe-S复合材料处理Cr(Ⅵ)的性能几乎没有影响。

Preparation of Magnetic Nano-Fe-S Composite and Treatment Performance of Cr(Ⅵ)

Magnetic nano-Fe-S composites were prepared by one-step method,and their particle size distribution was tested.The structures were confirmed by X-ray diffraction(XRD) and fourier transform infrared spectroscopy(FT-IR).The composition of magnetic nano-Fe-S composites was preliminarily discussed.The effects of pH value,addition amount and salt on the treatment of Cr(Ⅵ) properties of magnetic nano-Fe-S composites were investigated.The magnetic nano-Fe-S composite was composed of iron tetroxide(Fe3O4) and ferrous sulfide(FeS),with an average particle size of 284.8 nm and good magnetic separation.The magnetic nano-Fe-S composite had a good adsorption and reduction effect on Cr(Ⅵ),and the removal rate of the magnetic nano-Fe-S composite could reach more than 98% after 30 minutes with the addition of 20 mg/L to treat the waste liquid containing 2 mg/L of Cr(Ⅵ).The treatment performance of the material in acidic system was better than that in alkaline system.Salt had little effect on the treatment performance of Cr(Ⅵ) by magnetic nano-Fe-S composite.