College of Chemistry and Chemical Engineering, Yangzhou University, 225002, Yangzhou, China.
J Hazard Mater. 2013 Apr 15;250-251:229-37. doi: 10.1016/j.jhazmat.2013.01.074. Epub 2013 Feb 4.
A solvothermal synthetic route was used to prepare Ce(3+) doped Zn ferrites, where sphere-like clusters aggregated by nanosized particles were fabricated. The size of the cluster and the saturation magnetization of the sample are decreasing with the increase of Ce(3+). These samples can be easily separated from aqueous solutions by applying a magnetic field and have a high loading capacity of Cr(VI). The Cr(VI) adsorption experiments indicated that the adsorption was divided into two processes, in which the first one took place about 6h, the second one took place between 6 and 96 h. The maximum adsorption capacity for Cr(VI) was determined to be 57.24 mg/g. Langmuir model was employed to fit the adsorption isotherm, which implied the single layer adsorption. The data of SBET, external area and porous area of the samples can be used to explain these adsorption processes. And the Ce(3+) ions doped in the sample induced the increasing adsorption capacity of Cr(VI). The adsorption process can be described by the pseudo-second-order kinetic model.
采用溶剂热合成路线制备了 Ce(3+)掺杂的 Zn 铁氧体，合成出了由纳米颗粒聚集而成的球状团簇。团簇的尺寸和样品的饱和磁化强度随 Ce(3+)的增加而减小。这些样品可以通过施加磁场很容易地从水溶液中分离出来，并且对 Cr(VI)具有高的负载能力。Cr(VI)吸附实验表明，吸附过程分为两个阶段，第一阶段发生在大约 6h 内，第二阶段发生在 6 到 96h 之间。Cr(VI)的最大吸附容量被确定为 57.24mg/g。Langmuir 模型被用来拟合吸附等温线，这表明是单层吸附。样品的 SBET、外比表面积和多孔面积数据可以用来解释这些吸附过程。并且，掺杂在样品中的 Ce(3+)离子诱导了 Cr(VI)吸附容量的增加。吸附过程可以用伪二阶动力学模型来描述。
