中文摘要：

采用水热合成法制备了疏水性介孔二氧化硅材料（MCM-41-dry）并经煅烧制得亲水性介孔二氧化硅材料（MCM-41-cal）。试验探讨了p H值、吸附时间、投加量以及U（VI）初始浓度等因素对MCM-41材料煅烧前后吸附U（VI）效果的影响,利用SEM、EDS、BET和FTIR分析其吸附机理。试验结果表明,MCM-41-dry材料因具有有机模板剂,其吸附效果远高于MCM-41-cal的吸附效果;当p H值为5,吸附时间为180 min,温度为30℃,MCM-41-dry投加量为0.2 g/L,U（VI）初始浓度为10 mg/L时,其对U（VI）的吸附率可达99.2%;Langmuir吸附等温模型和准二级动力学方程能较好的拟合其吸附过程,当T=303 K时,理论饱和吸附量为241.935 mg/g,吸附为单分子层吸附,以化学吸附为主。通过BET、FTIR表征则说明MCM-41-dry具有六方形介孔结构能吸附U（VI）,官能团羟基和氨基发挥了很大的作用。

英文摘要：

Using hydrothermal synthesis prepared mesoporous silica material MCM-41 before and after calcination. The adsorption of MCM41-dry and MCM-41-cal for uranium（VI） are studied with static experiment. The influence factors on the uranium（VI） removal rate such as pH, adsorption time, dosage and initial concentration were researched, at the same time the removal mechanism was analyzed with SEM, EDS, BET and FTIR. The results indicate that MCM-41-dry for uranium（VI） is better than MCM- 41-cal because of having an organic templating agent. The optimum values of the parameters determined were 0.2 g/L for the dosage, 5 for the initial pH value, 180 min for the adsorption time, 30 ℃ for the temperature, 10 mg/L for the initial concentration of MCM41-dry, the removal rate reaches 99.2v/6. It can be seen that the behavior of uranium（VI） adsorption onto MCM-41-dry is a Langmuir type isotherm and pseudo second-order kinetic model. When T = 303 K, the theory adsorption capacity is 241. 935 mg/ g and adsorption is monolayer adsorption, basing on chemical adsorption. Through BET, FTIR characterization, the results indicate that MCM-41-dry can adsorb uranium （VI） with a hexagonal mesoporous structure, hydroxyl and amino functional groups play a significant role in adsorption.