Nanostructured ZnFe₂O₄ was synthesized by the heat treatment of a mechanically activated mixture of ZnO/α-Fe₂O₃. X-ray diffraction (XRD) and differential thermal analysis (DTA) results demonstrated that, after 5 h of the mechanical activation of the mixture, ZnFe₂O₄ was formed by heat treatment at 750°C for 2 h. To improve the characteristics of ZnFe₂O₄ for adsorption applications, the chemical activation process was performed. The 2 h chemical activation with 1 mol·L^-1 HNO₃ and co-precipitation of 52%-57% dissolved ZnFe₂O₄ led to an increase in the saturated magnetization from 2.0 to 7.5 emu·g^-1 and in the specific surface area from 5 to 198 m²·g^-1. In addition, the observed particle size reduction of chemically activated ZnFe₂O₄ in field emission scanning electron microscopy (FESEM) micrographs was in agreement with the specific surface area increase. These improvements in ZnFe₂O₄ characteristics considerably affected the adsorption performance of this adsorbent. Adsorption results revealed that mechano-thermally synthesized ZnFe₂O₄ had the maximum arsenic adsorption of 38% with the adsorption capacity of 0.995 mg·g^-1 in a 130 mg·L^-1 solution of As(V) after 30 min of agitation. However, chemically activated ZnFe₂O₄ showed the maximum arsenic adsorption of approximately 99% with the adsorption capacity of 21.460 mg·g^-1 under the same conditions. These results showed that the weak adsorption performance of mechano-thermally synthesized ZnFe₂O₄ was improved by the chemical activation process.

纳米结构化的ZnFe ₂ ö ₄中的ZnO /α-Fe的机械活化的混合物的热处理合成₂ ö ₃。X射线衍射（XRD）和差热分析（​​DTA）结果表明，混合物的机械活化5小时后，通过在750℃下热处理2小时形成ZnFe ₂ O ₄。为了改善用于吸附应用的ZnFe ₂ O ₄的特性，进行了化学活化过程。用1mol·L ^-1 HNO _3进行2 h化学活化，并溶解52％-57％的ZnFe ₂ O ₄共沉淀导致饱和磁化强度从2.0增加到7.5 emu·g ^-1，比表面积从5增加到198 m ² ·g ^-1。此外，在场发射扫描电子显微镜（FESEM）显微照片中观察到的化学活化的ZnFe ₂ O _4的粒径减小与比表面积的增加一致。ZnFe ₂ O ₄特性的这些改进极大地影响了该吸附剂的吸附性能。吸附结果表明，机械热合成ZnFe ₂ O ₄的最大砷吸附率为38％，吸附量为0.995 mg·g。^-1在130毫克·L ^-1后搅拌30分钟的As（V）的溶液。但是，在相同条件下，化学活化的ZnFe ₂ O ₄的最大砷吸附量约为99％，吸附量为21.460 mg·g ^-1。这些结果表明，通过化学活化过程改善了机械热合成的ZnFe ₂ O ₄的弱吸附性能。