毕业论文 纳米Al2O3对Th的吸附性能的探讨.docx

毕业论文 纳米Al2O3对Th的吸附性能的探讨.docxEAST CHINA UNIVERSITY OF TECHNOLOGY
毕业设计(论文)
题目：纳米AI2O3对Th(IV)的吸附性能的探讨
English Title: Study on adsorbability of Th(IV) on nano-alumina
专 业：应用化学 学生姓名：彭真
学 号：05051217
指导老师：周跃明
二零零九年六月
摘要
采用溶胶-凝胶法制备纳米A12O3,光度法探讨纳米氧化铝对Th(IV)的吸附性能, 考察了溶液pH值和盐效应等对吸附的影响。溶液酸度影响A12O3表面电位，从而影 响Th”的吸附，同时A12O3之间产生较强的排斥力；盐效应使Th(OH)4沉淀的溶解 度增大，而Na+与Th”竞争AI2O3表面位，使AI2O3的吸附减弱。结果表明，不加 缓冲溶液控制pH3时T『+的吸附效果最佳，测得纳米AI2O3对Th(IV)静态吸附容量 mg/g,对于探讨纳米AI2O3对放射性元素等的吸附有较大的意义。
关键词：溶胶-凝胶法；纳米A12O3；吸附；Th(IV)； pH
ABSTRACT
The nanometer AI2O3 powders were prepared by the Sol-Gel method. The adsorption behavior of nanometer-sized alumina on Th(IV) was investigated by spectrophotometry. Some conditions such as pH value and salt-effect on adsorption behavior were also examined. Solution acidity affected surface potential of alumina, thereby, affected the adsorption to Th4+, simultaneity brought stronger repulsive force between alumina; salt-effect increased the solubility of Th(OH)4, while competitive effects of Na+ and Th4+ on surface potential of alumina weakened adsorbability of alumina. Ifs shown that: this case, pH value was 3 without the buffer solution, shew the best adsorbing effect. The static adsorption capacity of Th(IV) is mg/g. It has certain significance to study on Its adsorption capacity of some radioactive element.
Key word: Sol-Gel; nanometer Al2O3； spectrophotometry; Th(IV); pH
目录
1绪论 1
1
1
1
2
2
2
3
3
3
5
6
、探讨目的及意义 7
8
8
(IV) 8
2实验部分 9
9
9
9
9
10
10
11
11
12
12
12
12
pH 值 12
14
15
15
15
19
19