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毕业设计（论文）

题目：纳米Al2O3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

东华理工大学毕业设计（论文） 摘要

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Th4+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Th4+竞争A12O3表面位，使A12O3的吸附减弱。结果表明，不加缓冲溶液控制pH3时Th4+的吸附效果最佳，测得纳米Al2O3对Th(Ⅳ)静态吸附容量为15.41 mg/g，对于探讨纳米A12O3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

东华理工大学毕业设计（论文） ABSTRACT

ABSTRACT

The nanometer A12O3 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. It’s 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 15.41 mg/g. It has certain significance to study on Its adsorption capacity of some radioactive element.

Key word: Sol-Gel; nanometer A12O3; spectrophotometry; Th(Ⅳ); pH