负载型Al(OH)3/SiO2的合成及对铀酰的吸附性能

制备了负载型吸附剂Al(OH)₃/SiO₂，研究其对铀酰离子的吸附行为。分别考察了吸附剂质量、溶液pH、初始浓度、温度和吸附时间对吸附性能的影响；结合吸附等温线、热力学以及动力学初步研究了吸附机理，并探究了共存离子和富里酸对吸附性能的影响。结果表明，当吸附剂质量0.03 g、pH=5、初始浓度1 mmol/L、温度303 K、吸附时间60 min时，最大吸附量为110.4 mg/g，可以重复使用4次；Al(OH)₃/SiO2对铀酰离子的吸附过程是吸热且自发进行，以单分子层吸附为主，吸附行为符合准二级动力学模型，化学吸附是速率控制步骤。

Synthesis of Supported Al(OH)3/SiO2 and Its Adsorption Properties for Uranyl

The preparation of supported adsorbent Al(OH)₃/SiO₂ and its adsorption behavior on uranyl ions were studied.The effects of adsorbent quality,solution pH,initial solution concentration,temperature and contact time on adsorption performance were investigated.The adsorption mechanism was preliminarily studied based on adsorption isotherm,thermodynamics,and kinetics.The effects of coexisting ions and fulvic acid on the adsorption properties were also investigated.The results showed that when the adsorbent mass was 0.03 g,pH=5,initial concentration of uranyl ions was 1 mmol/L,temperature was 303 K and contact time was 60 min,the maximum adsorption capacity was 110.4 mg/g,which could be reused four times.The adsorption process of uranyl ion on Al(OH)₃/SiO₂ is endothermic and spontaneous.The adsorption of monolayers is dominant,the adsorption behavior conforms to the quasisecondary kinetic model,and the chemical adsorption is the rate control step.