磷酸三丁酯修饰Ti纳米晶须应用于吸附铀酰离子  

Adsorption of uranium by chemically modified titanate nanowhiskers

作　　者：张麟熹[1] 孙玉珍 罗明标[1] 刘淑娟[1] 胡军[1] 

机构地区：[1]东华理工大学应用化学系,抚州344000 [2]江西省中医药高等专科学校医学基础部,抚州344000

出　　处：《复合材料学报》2011年第3期96-102,共7页Acta Materiae Compositae Sinica

基　　金：国防基础科研项目(A3420060146);东华理工研究生创新基金(DYCA10013)

摘　　要：采用纳米金红石型TiO2为Ti源,水热法合成了Ti纳米晶须,将其表面负载磷酸三丁酯(TBP)制备出修饰Ti纳米晶须。用SEM、TEM及傅里叶红外光谱仪对Ti纳米晶须及修饰Ti纳米晶须的形貌和结构进行表征,分别研究了两种材料对铀离子的吸附性能,考察了修饰Ti纳米晶须吸附铀的动力学及等温吸附模型。电镜表征结果表明,水热温度为160℃成功合成出Ti纳米晶须,其粒径范围为80～100 nm。吸附铀研究结果表明,在3 mol/L NO3-介质中修饰Ti纳米晶须表现出较高的吸附性能,修饰Ti纳米晶须对铀的吸附动力学模型符合准二级动力学,吸附等温线符合Langmuir和Freundlich等温吸附模型。将修饰Ti纳米晶须用于自来水中低浓度铀的回收,结果较好。Titanate nanowhiskers were synthesized by a hydrothermal method with nano-sized titanate dioxide rutile as the titanate source,and then the modified titanate nanowhiskers were obtained by loading tributyl phosphate（TBP） on the surface of the titanate nanowhiskers.The morphology and structure of the titanate nanowhiskers and the modified titanate nanowhiskers were characterized by SEM,TEM and FTIR.The two nanomaterials were applied for the adsorption of uranium ion,and the adsorption kinetics and the adsorption isotherm model of the modified titanate nanowhiskers were studied.SEM photographs show that the particle size of the titanate nanowhiskers ranges from 80nm to 100nm.Uranium adsorption studies demonstrate that modified titanate nanowhiskers exhibite higher adsorption capacity in 3mol/L NO-3 medium than titanate nanowhiskers.Adsorption kinetics of uranium on modified titanate nanowhiskers is in accordance with quasi-second order kinetic model,and adsorption isotherm model consistents with Langmuir and Freundlich isotherm model.The modified titanate nanowhiskers were applied to recover low concentration uranium from tap water,and satisfactory results were achieved.

关 键 词：无机纳米材料 吸附铀 Ti纳米晶须 水热法 磷酸三丁酯 

分 类 号：TB332[一般工业技术—材料科学与工程]