Abstract A magnetic chromium ferrite (CrFe2O4) nanocomposite was prepared through the sonochemical method in the presence of oleic acid as a nonionic surfactant. The produced powder was further characterized using energy dispersive spectroscopy (EDX), X-ray diffraction (XRD), a vibrating sample magnetometer (VSM) technique, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) spectroscopy. SEM and TEM images showed the surface morphology and formation of nanosized particles. The removal of molybdenum (VI) from fission products was studied using a magnetic CrFe2O4 nanoadsorbent by the batch adsorption technique. The point of zero charge, pHPZC, of the magnetic ferrite was determined by the solid addition method. Adsorption was successfully described using a pseudo-second-order model. The Langmuir and Toth models were capable of perfectly fitting the equilibrium data. Additionally, the thermodynamic parameters were obtained. The desorption amount of molybdenum ions reached the maximum value (exceeding 99%) when using 1.0 mol/L NaOH. These results suggested that the magnetic CrFe2O4 nanoadsorbent was an adsorbent that could be potentially used for the successful removal of molybdenum (VI) from a mixture of metal ions found in fission products.

中文翻译：

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使用非离子表面活性剂的合成磁性铬铁氧体纳米复合材料从水溶液中吸附去除 Mo(VI)

摘要 以油酸为非离子表面活性剂，通过声化学法制备了磁性铬铁氧体（CrFe2O4）纳米复合材料。使用能量色散光谱 (EDX)、X 射线衍射 (XRD)、振动样品磁强计 (VSM) 技术、扫描电子显微镜 (SEM)、透射电子显微镜 (TEM) 和傅里叶变换红外 (FTIR) 进一步表征生产的粉末) 光谱学。SEM 和 TEM 图像显示了纳米颗粒的表面形态和形成。使用磁性 CrFe2O4 纳米吸附剂通过批量吸附技术从裂变产物中去除钼 (VI)。磁性铁氧体的零电荷点 pHPZC 通过固体添加法确定。使用伪二阶模型成功地描述了吸附。Langmuir 和 Toth 模型能够完美拟合平衡数据。此外，还获得了热力学参数。使用1.0 mol/L NaOH时钼离子的解吸量达到最大值（超过99%）。这些结果表明，磁性 CrFe2O4 纳米吸附剂是一种可能用于成功去除裂变产物中发现的金属离子混合物中的钼 (VI) 的吸附剂。