中文摘要：

钍作为潜在的核能资源,其净化富集对未来核能发展具有重要的研究价值。本文利用静态批式方法研究磷酸酯功能化介孔硅材料（NP10）对Th（Ⅳ）的吸附行为,考察Th（Ⅳ）起始浓度、pH、吸附时间、离子强度、固液比以及温度等对吸附的影响。实验结果表明,在（14±1）℃（室温）条件下,NP10对Th（Ⅳ）的吸附30min即达到平衡,最大吸附容量为149mg/g。当吸附温度升至40℃时,吸附容量可进一步增加到192mg/g;pH对吸附的影响较大,当pH在0.9～4范围内时,NP10对Th（Ⅳ）的吸附容量随着pH增大而显著增大;相比而言,溶液离子强度对吸附影响不大;此外,固液比对吸附影响很大,随着吸附剂用量增加,NP10对Th（Ⅳ）的吸附效率逐渐增加并趋于100%。

英文摘要：

Thorium,as an important natural radioactive element,is receiving an ever-increasing interest as nuclear fuel alternatives to uranium in nuclear power industry.In view of the extensive application,the development of reliable methods for the monitoring,and the recovery of Th from environmental and geological samples are of particular significance.Herein,a novel sorbent of Th（Ⅳ）,phosphonate-functionalized mesoporous silica（NP10）,was synthesized,and the adsorption of Th（Ⅳ） from aqueous solution using NP10 was studied in batch processes under varying operation conditions of pH,temperature,adsorption time and Th（Ⅳ） concentration.The experimental results show that the adsorption of Th（Ⅳ） by NP10 is ultra-fast,and the sorption process reaches equilibrium after about 30 min.The adsorption process can be well described by the Langmuir equation and the maximum sorption capacity is estimated to 149 mg/g at temperature of（14±1） ℃.When the adsorption temperature is up to 40 ℃,the maximum sorption capacity reaches 192 mg/g.It is also found that the adsorption percentage of Th（Ⅳ） by NP10 increases rapidly with pH from 0.9 to 4,whereas ionic strength shows no obvious effect on the adsorption.Moreover,the adsorption percentage of Th（Ⅳ） by NP10 increases with the mass of NP10 until almost complete adsorption（〉97%）.