Fe_3O_4@Vc磁性纳米材料的合成及其对水中Cu(Ⅱ)的吸附性能研究

A Method to Produce Magnetic Ascorbic Acid-coated Fe_3O_4 Nanoparticles and the Study of Removal of Cu(Ⅱ) Ions from Aqueous Solution

通过水热法合成了Fe3O4@Vc磁性纳米材料。采用X射线衍射(XRD)、红外光谱(FT-IR)、比表面积(BET)等表征手段对合成样品的形貌粒径和结构进行了表征。Fe3O4@Vc磁性纳米材料的比表面积可达213.794m2/g,为合成的Fe3O4磁性纳米球的10倍。研究了pH值、磁性纳米材料的投加量、Cu(II)溶液的初始浓度和振荡时间对吸附的影响。结果表明,在pH为4、T=298K的最优条件下,Fe3O4@Vc磁性纳米材料对Cu(II)的吸附率可达98%以上,饱和吸附量为44.9mg/g。以10mL 0.15mol/L的盐酸溶液作为洗脱液,富集倍数为12。

Magnetic ascorbic acid-coated Fe3O4 nanoparticles were successfully synthesized via an environmentally friendly hydrothermal route.The resulting products are characterized by X-ray diffraction （XRD）,Fourier transform infrared spectra （FFIR） and BET specific area,which showed that the as-synthesized ascorbic acid-coated Fe3O4 nanoparticles have a high specific surface area of about 213.79 m2/g.Various factors affecting the uptake behavior such as contact time,pH,amount of magnetic ascorbic acid-coated Fe3O4 nanoparticles and initial concentration of Cu2＋ were investigated.The adsorption data showed that absorption can be up to 98％ at pH of 4 with a maximum adsorption capacity of 16.56mg/g for Cu2 ＋.Adsorbed Cu （Ⅱ） could be eluted with hydrochloric acid whose the concentration is 0.15mol/L and the enrichment multiple is 12.