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摘要切尔诺贝利、福岛等核事故造成的辐射污染对人类和环境产生了极大的危害，碘作为辐射污染中一种重要的放射性核素，对它的捕集十分重要。本课题利用银掺杂对金属有机骨架材料MIL-101进行改性，得到了一种对放射性碘具有良好吸附性能的吸附功能材料。26969
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首先，通过水热合成法制得银改性MIL-101多孔材料，利用SEM、XRD、比表面积及孔径分析仪等仪器对该材料进行了较全面的表征测试。研究结果表明：改性后的MIL-101外观形貌几乎不发生改变，仍保有MIL-101的原XRD特征峰，比表面积及孔容随着掺杂量的增加有一定程度的下降。
其次，将制备的改性多孔材料对溶液中碘离子进行吸附实验，考察了银掺杂量、吸附时间和碘离子初始浓度等参数对吸附效果的影响。研究发现，通过对MIL-101掺杂银改性，能够有效提高其对碘离子的吸附效率。随着银掺杂量的增加，材料对碘离子的吸附效率增加，从未改性的9.61%增加到改性后的39.2%。吸附效率在前30min急剧增加，可达到总吸附效率的80%以上，显示出改性后材料良好的快速吸附性能。
关键词 MIL-101 银改性 放射性碘 吸附性能
毕业论文设计说明书外文摘要
Title Preparation of Silver Modified MIL-101 and Its Adsorption of Radioactive Iodine
Abstract
Radioactive contamination caused by nuclear accident such as Chernobyl and Fukushima has done great harm to human beings and the environment. As one of main radionuclide in radioactive contamination, the capture of iodine is significant. In this paper, an adsorbent that perform well in the capture of radioactive iodine was prepared through the modification of metal organic framework MIL-101.
Firstly, MIL-101 was synthesized by using hydrothermal method and was modified through doping silver element. The comprehensive characterization of the material was test by using SEM, XRD and the specific surface area and pore size analyzer. The results show that the morphology of modified MIL-101 changes a little, it still retains the characteristic peaks of original MIL-101, and its specific surface area and pore volume decrease slightly with the increase of doping amount.
Secondly, the modified porous material was used to do adsorption experiments of iodide ion in solution. The effect of the amount of silver doped, adsorption time and initial concentration of iodide ion was studied. The research found that the modification of MIL-101 can improve its adsorption efficiency of iodine ions, and with the increase of the amount of silver, the adsorption efficiency improves from original 9.61% to 39.2% after modification. The adsorption efficiency increases dramatically and can reach about more than 80% of total adsorption efficiency in the first thirty minutes. With the increase of the concentration of iodide ion, the adsorption capacity increased, but the adsorption rate decreased.
Keywords MIL-101 silver modification radioactive iodine adsorption
目 次
1 绪论 1
1.1 放射性碘 1
1.1.1 放射性碘的来源 1
1.1.2 放射性碘的进入人体的途径 1
1.1.3 放射性碘的危害 2
1.2 放射性碘的捕集方法简介 3
1.2.1 絮凝沉淀法 3
1.2.2 离子交换法 3
1.2.3 膜处理法 3
1.2.4 吸附法 4
1.3 常用固体吸附剂 4
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