Materials Science Laboratory, Radiation Physics Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt.
Hot Lab. Center, Egyptian Atomic Energy Authority (EAEA), P.O. 13759, Inshas, Cairo, Egypt.
J Colloid Interface Sci. 2022 Feb;607(Pt 1):111-124. doi: 10.1016/j.jcis.2021.08.166. Epub 2021 Aug 30.
Herein, a novel adsorbent based on carbon-modified zirconia/spinel ferrite (C@ ZrO/MnMgZnFeO) nanostructures were chemically prepared to remove Co and Eu radionuclides from liquid media using batch experiments. The XRD pattern confirms the successful preparation of the C@ZrO/MnMgZnFeO composite. Also, SEM and TEM images confirmed that the composite owns a heterogeneous morphology in the nanoscale range. The optical band gap value of MnMgZnFeO, ZrO, and the composite samples was 1.45, 2.38, and 1.54 eV, respectively. Many parameters have been studied as the effect of time, solution pH, and initial ion concentration. The kinetics models for the removal process of Eu and Co radionuclides were studied. The second-order kinetic equation could describe the sorption kinetics for both radionuclides. The Langmuir monolayer capacity for Co was 82.51 mg/g and for Eu was 136.98 mg/g. The thermodynamic parameters such as free energy ΔG, the enthalpy ΔH and the entropy ΔS were calculated. The results indicated that the sorption process has endothermic nature for both two radionuclides onto C@ZrO/MnMgZnFeO composite.
在此，通过批量实验，利用化学方法制备了一种基于碳改性氧化锆/尖晶石铁氧体（C@ZrO/MnMgZnFeO）纳米结构的新型吸附剂，以从液体介质中去除 Co 和 Eu 放射性核素。XRD 图谱证实了 C@ZrO/MnMgZnFeO 复合材料的成功制备。此外，SEM 和 TEM 图像证实了该复合材料在纳米尺度范围内具有异质形态。MnMgZnFeO、ZrO 和复合材料样品的光学带隙值分别为 1.45、2.38 和 1.54 eV。研究了许多参数，如时间、溶液 pH 值和初始离子浓度对 Eu 和 Co 放射性核素去除过程的影响。研究了去除 Eu 和 Co 放射性核素过程的动力学模型。对于两种放射性核素，二级动力学方程可以描述吸附动力学。Co 的单层容量为 82.51 mg/g，Eu 的为 136.98 mg/g。还计算了自由能ΔG、焓ΔH 和熵ΔS 等热力学参数。结果表明，对于 C@ZrO/MnMgZnFeO 复合材料上的两种放射性核素，吸附过程均为吸热。
