Synthesis of Ce³⁺ doped ZnFe₂O₄ self- assembled clusters and adsorption of chromium(VI)

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• 作者：Sanke Kuai ; Zhibin Zhang ; Zhaodong Nan ; ^{zdnan@yzu.edu.cn}
• 关键词：Magnetic materials ; Zn ferrite ; Adsorption ; Chromium
• 刊名：Journal of Hazardous Materials
• 出版年：2013
• 出版时间：15 April, 2013
• 年：2013
• 卷：250-251
• 期：Complete
• 页码：229-237
• 全文大小：1607 K

文摘

A solvothermal synthetic route was used to prepare Ce³⁺ 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 Ce³⁺. 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 6 h, 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 S_BET, external area and porous area of the samples can be used to explain these adsorption processes. And the Ce³⁺ 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.