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用于放射性碘吸附的Cu改性MIL-101研究

时间:2019-02-19 20:37来源:毕业论文
采用水热法合成出MIL-101和金属铜改性的MIL-101多孔吸附材料,通过SEM、XRD和N2吸附等手段对材料进行表征分析。结果显示改性前后物质的骨架和孔隙结构未发生改变。掺杂量不同,材料的

摘要核电站作为利用核反应释放的能量产生电能的场所,会产生放射性碘。本文选择金属有机骨架材料MIL-101进行掺杂铜改性,以提高材料在常温常压下对放射性碘的吸附能力。
采用水热法合成出MIL-101和金属铜改性的MIL-101多孔吸附材料,通过SEM、XRD和N2吸附等手段对材料进行表征分析。结果显示改性前后物质的骨架和孔隙结构未发生改变。掺杂量不同,材料的性能存在差异,当掺杂量为20%时,材料对N2的吸附能力最大,BET比表面积最大为3854.03 m2/g。
还考察了铜掺杂量、吸附时间和碘离子浓度等参数对MIL-101吸附效果的影响。结果表明:铜改性后吸附率明显增加,最多可以提高4倍,材料的吸附率由原来未改性的6.51%提高到改性后的25.01%;吸附效果随掺杂量增加而增加,当铜元素掺杂量为20%时样品的吸附效果达到最佳,对浓度为0.04mg/L的碘溶液,碘离子的吸附率最高可达48.35%。此外,改性前后材料均存在吸附速率随时间增大而降低和吸附率随浓度减小而增大的趋势。33372
毕业论文关键词:放射性碘  铜改性  MIL-101  掺杂量  吸附率
毕业设计说明书外文摘要
Title: The Preparation of Copper Modified MIL-101 and Its  Adsorption for Iodine Ions                     
Abstract
Nuclear power plants, as the sites that the energy released by nuclear reaction is used to generate electrical energy, will produce radioactive iodine. This article had implemented modification of doped-copper by choosing metal organic framework MIL-101 so as to improve the adsorption capacity of the material of radioactive iodine at ambient temperature and pressure.

源自$六l维,论:文w网)加7位QQ3249^114 www.lwfree.cn


Characteristic analysis was made for MIL-101 by hydrothermal method and copper-modified porous adsorbent material MIL-101 through method of SEM, XRD and N2 adsorption. The results showed that the skeleton and pore structure of the material before and after modification is not altered. If doping amount is different, there are differences in material properties. When the doping amount is 20%, the material shows a high adsorption capacity and big BET specific area 3854.03 m2/g.
This article had examined the impact of parameters such as copper doping, adsorption time and iodide concentration on efficiency of MIL-101 adsorption, too. The results showed that: the rate of adsorption modified with copper was increased up to four times, and the adsorption rate of the material was elevated from 6.51% before modification to 25.01% after modification. Adsorption capacity was increased with the doping amount. When amount of copper doping was 20%, the adsorption efficiency of the sample was optimum, and for the iodine solution with concentration of 0.04mg/L, the adsorption rate of iodide ion could be up to 48.35%. There existed the trend that the adsorption rate of material before and after modification was reduced with the increase with the time and was magnified with the decrease in concentration.
Keywords radioactive iodine  Copper modification  MIL-101  Doping amount  adsorption rate
 目录
1  绪论..1
1.1  课题研究的背景    1
1.2  放射性碘的来源及其对环境的污染    1
1.3  放射性废液中放射性碘的处理和处置    2
1.3.1  离子交换法    2
1.3.2  絮凝沉淀法    3
1.3.3  蒸发浓缩法    3
1.3.4  吸附法    3
1.4  关于MIL-101材料    4
1.4.1  金属有机骨架材料(MOFs)    4
源自$六l维,论:文w网)加7位QQ3249^114 www.lwfree.cn

1.4.2  MIL-101材料    5
1.5  本课题研究的内容    5 用于放射性碘吸附的Cu改性MIL-101研究:http://www.lwfree.cn/huaxue/20190219/30407.html
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