【摘要】 目的合成碳氮结构空心管材料,用于稀土矿山开采中放射性钍离子的吸附去除,方法通过三聚氰胺和三聚氰酸超分子自组装,经水热碳化及高温热解,制备碳氮结构空心管材料。采用SEM、XRD等对材料进行表征。在不同热解温度和p H值下进行钍离子吸附实验,比较不同钍离子的初始浓度和吸附时间下吸附容量的差异。结果 600℃时,材料形貌为均匀的中空管状结构;pH=3.5,热解温度为800℃时,材料最大吸附容量达到133.87mg/g,吸附过程符合Langmuir等温吸附模型且遵从准二级动力学规律。结论碳氮结构空心管材料对钍离子具有良好的吸附效果,有望用于稀土开采过程中产生的放射性废钍离子的去除。更多还原

【Abstract】 This paper aims to synthesize carbon-nitrogen structure hollow tube material for the adsorption and removal of radioactive thorium ions produced in rare earth mines. Through melamine and cyanuric acid supramolecular self-assembly, carbon-nitrogen structure hollow tube material was prepared by hydrothermal carbonization and high temperature pyrolysis and analyzed by scanning electron microscopy(SEM) and X-ray diffraction(XRD). Thorium ion adsorption experiments were carried out at different pyrolysis temperatures and pH, and the difference in adsorption capacity under different initial concentrations of thorium ions and adsorption time was compared. The morphology of the material was a uniform hollow tubular structure at 600 ℃. When pH=3.5 and pyrolysis temperature is 800 ℃, the maximum adsorption capacity reached 133.87 mg/g. The adsorption process conforms to the Langmuir isotherm adsorption model and follows the Pseudo-second-order kinetics model. The carbon-nitrogen structure hollow tube material has a good adsorption effect on thorium ions, which is expected to be used in the removal of thorium ions in radioactive wastewater generated by rare earth mining.更多还原