中文摘要：

以聚环氧乙烷-聚环氧丙烷-聚环氧乙烷三嵌段共聚物（P123）为模板剂,1,2-二（三乙氧基硅基）乙烷（BTSE）和正硅酸乙酯（TEOS）为混合硅源前驱物,（3-氰丙基）三乙氧基硅烷（NPTS）为硅烷偶联剂,经过胺肟化制备出了一种新型铀吸附剂-偕胺肟基乙烷桥键介孔二氧化硅（AO-PMOs）。分析吸附过程的等温吸附规律和反应动力学规律,并用傅里叶红外光谱仪（FT-IR）、扫描电镜（SEM）、能谱仪（EDS）分析吸附机理。结果表明：AO-PMOs对铀的吸附动力学较好地符合准二级动力学模型,表明该吸附过程以化学吸附为主;吸附等温线符合Langmuir模型,表明AO-PMOs对铀的吸附以单分子层吸附为主。傅里叶红外光谱图、扫描电镜图和能谱图表明：AO-PMOs表面有物质被吸附且证明该物质即为溶液中的铀;吸附铀后的偕胺肟基团发生变化,表明吸附铀主要是偕胺肟基团的作用。

英文摘要：

The amidoxime ethane-bridged periodic mesoporous silicas was synthesized by using poly（ethylene oxide）-poly（propylene oxide）-poly（ethylene oxide） triblock copolymer（P123） as template,1,2-bis（triethoxysilyl） ethane（BTSE） and tetraethoxysilane（TEOS） as framework precursors, 3-cyanopropyltriethoxysilane（NPTS）as silane coupling agent. The adsorption isotherms and reaction kinetic laws of the adsorption process were analyzed. Fourier transform infrared spectrometer（FT-IR）, scanning electron microscope（SEM） and energy dispersive spectrometer（EDS） were used for the analysis of the adsorption mechanism. Results showed that the adsorption kinetic of U（ Ⅵ） by AO-PMOs conformed to pseudo-second order kinetic model, which proved that adsorption process was given priority to chemical adsorption;adsorption isotherm in line with the Langmuir model revealed that the adsorption of U（ Ⅵ） by AO-PMOs was mainly monolayer adsorption. The diagrams of FT-IR, SEM and EDS showed that the material adsorbed in the surface of AO-PMOs was U（ Ⅵ）, and the amidoxime group＇s changes after adsorption indicated that the adsorption of U（ Ⅵ） were primarily depended on them.