摘要：

以水产业中产生的虾壳为原料进行改性，通过静态吸附实验探究H₂O₂改性后的虾壳粉对水中U（Ⅵ）的吸附影响因素。结果表明，当U（Ⅵ）溶液pH=3，改性虾壳粉投加量为0.2 g/L，U（Ⅵ）溶液质量浓度为10 mg/L，吸附时间为120 min时，改性虾壳粉对U（Ⅵ）的吸附量达到48.58 mg/g，pH对改性虾壳粉吸附U（Ⅵ）有较大影响。对吸附过程中的动力学分析以及吸附前后的改性虾壳粉的SEM、FTIR等表征结果表明：改性虾壳粉对U（Ⅵ）的吸附过程符合准一级动力学方程和Freundlich吸附等温模型，改性虾壳粉对U（Ⅵ）吸附的主要官能团为羟基、氨基、磷酸基等基团。响应面分析结果表明，吸附时间一定时，改性虾壳粉对水中U（Ⅵ）的去除影响因素，pH＞改性虾壳粉投加量＞U（Ⅵ）溶液浓度。

关键词: 改性虾壳, 吸附, 铀

Abstract:

Shrimp shells produced in the water industry were modified as raw materials, the factors affecting the adsorption of U(Ⅵ) in water by shrimp shell powder modified by hydrogen peroxide were investigated through static adsorption experiments. Results showed that when pH of the solution was 3, adsorption capacity of U(Ⅵ) reached the maximum, When dosage of modified shrimp shell powder was 0.2 g/L, concentration of U(Ⅵ) solution was 10 mg/L and adsorption time was 120 min, shrimp shell powder modified adsorption capacity of U(Ⅵ) reached 48 mg/g, pH value had a great influence on the adsorption of U(Ⅵ) in water by the modified shrimp shell powder. The kinetic analysis during the adsorption process and the modified shrimp shell powder before and after adsorption were characterized by SEM, FTIR and other modern methods. Results showed that the modified shrimp shell of U(Ⅵ) shell conforms to the quasi-first order kinetics equation and Freundlich adsorption isothermal adsorption model, modified shrimp shell powder for U(Ⅵ) adsorption of main functional groups for hydroxyl, amino and phosphate group and other groups.The results of response surface analysis showed that when the adsorption time was constant, the influencing factors of U(Ⅵ) removal were pH>dosage of modified shrimp shell powder>concentration of U(Ⅵ) solution.

Key words: modified shrimp shell, adsorption, uranium

中图分类号: 

• X703.1