Department of Environmental Science & Engineering, Hunan Agricultural University, Changsha 410128, China.
J Environ Sci (China). 2013 Feb 1;25(2):413-8. doi: 10.1016/s1001-0742(12)60014-x.
La-EDTA-Fe3O4 was prepared by a chemical co-precipitation method. The magnetic composite was characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). Furthermore, the adsorption properties of La-EDTA-Fe3O4 toward phosphate in water were investigated. The uptake rate of phosphate in water by La-EDTA-Fe3O4 was 3-1000 times than that of EDTA-Fe3O4, and reached 97.8% at 7 hr. The adsorption process agreed well with the Freundlich model and kinetics studies showed that the adsorption of phosphate proceeds according to pseudo second-order adsorption kinetics. The maximum removal rate was achieved at pH 6.0-7.0. The La-EDTA-Fe3O4 had good adsorption properties and could be separated well from aqueous solution by a permanent magnet. Therefore, this nanomaterial has potential application for the removal of phosphate from large water bodies.
La-EDTA-Fe3O4 通过化学共沉淀法制备。采用透射电子显微镜（TEM）、X 射线衍射（XRD）和傅里叶变换红外光谱（FT-IR）对磁性复合材料进行了表征。此外，还研究了 La-EDTA-Fe3O4 对水中磷酸盐的吸附性能。La-EDTA-Fe3O4 在水中对磷酸盐的吸附速率是 EDTA-Fe3O4 的 3-1000 倍，在 7 小时内达到 97.8%。吸附过程符合 Freundlich 模型，动力学研究表明，磷酸盐的吸附符合拟二级吸附动力学。最大去除率在 pH 6.0-7.0 时达到。La-EDTA-Fe3O4 具有良好的吸附性能，可通过永磁体从水溶液中很好地分离。因此，这种纳米材料具有从大型水体中去除磷酸盐的潜力。
