高温结晶合成Mn2O3@MoS2复合材料及其对铀的吸附性能

采用高温熔盐电解法合成了MoS₂，为了提高MoS₂对铀的吸附性能，以MoS₂为基底复合Mn₂O₃。MoS₂的片层结构有效地分散了Mn₂O₃的团聚，同时引进了亲铀氧基团。采用电子扫描显微镜及能谱(SEM & EDS)、X射线衍射仪(XRD)、Zeta电位仪等对Mn₂O₃@MoS₂复合材料进行了表征，表征结果表明，高温结晶合成的Mn₂O₃@MoS₂复合材料具有完整的微观形貌和稳定的晶体结构。通过静态吸附批实验探究了在不同变量下Mn₂O₃、MoS₂和Mn₂O₃@MoS₂三个材料对溶液中铀的吸附效果，结果表明，Mn₂O₃@MoS₂的吸附性能优于Mn₂O₃和MoS₂，在pH=5.5时，吸附平衡时间为90 min，吸附动力学遵循准二级动力学模型，吸附等温线符合Langmuir模型。Mn₂O₃@MoS₂的单层饱和吸附容量为117.5 mg/g，在293.15~318.15 K的温度梯度中，升温有利于吸附进行。

High Temperature Crystallization Synthesis Mn2O3@MoS2 on Composite Materials and Their Adsorption Properties for Uranium

In this work, MoS₂ was prepared using a high temperature molten salt electrolysis. In order to improve the adsorption performance of MoS₂ for U(Ⅵ), Mn₂O₃ was blended on molybdenum disulfide substrate. The laminar structure of MoS2 effectively dispersed the agglomeration of Mn₂O₃ and introduced uranophilic oxygen group. Scanning electron microscopy, energy dispersive spectroscopy(SEM & EDS), X-ray diffractometer(XRD) and Zeta potentiometers were used for the characterization of Mn₂O₃@MoS₂. The characterization results show that the high temperature crystallization composite has a complete microstructure and stable crystal structure. By controlling the experimental conditions of variables, the adsorption performance of Mn₂O₃, MoS₂ and Mn₂O₃@MoS₂ on U(Ⅵ) in solution was studied. The results indicate that the adsorption performance of Mn₂O₃@MoS₂ is better than those of Mn₂O₃ and MoS₂, and the adsorption equilibrium time is 90 min at pH=5.5. The adsorption kinetics follows the pseudo-2nd-order kinetic model and the adsorption isotherm curve agrees well with the Langmuir model. The maximum single-layer adsorption capacity of Mn₂O₃@MoS₂ is 117.5 mg/g. Increasing of the temperature from 293.15 K to 318.15 K is beneficial for the adsorption progress.