钛酸纳米晶须的制备及其对Th(Ⅳ)的吸附性能研究  

Synthesized of titanate nanowhiskers and adsorption of Th (Ⅳ)

作　　者：刘建亮[1,2] 罗明标[1] 袁自遵[1] 平爱东[1] 侯艳巧 

机构地区：[1]东华理工大学核资源与环境国家重点实验室培育基地 [2]中国人民解放军91280部队

出　　处：《功能材料》2013年第23期3496-3501,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(21261001);江西省教育厅科技资助项目(GJJ1239)

摘　　要：以纳米金红石型TiO2为钛源,采用水热法制备钛酸纳米晶须,用XRD、FT-IR、SEM及TEM对钛酸纳米晶须的形貌及结构进行表征。结果表明在180℃水热条件下成功合成出钛酸纳米晶须。采用静态批式法研究了接触时间、pH值、离子强度、Th(Ⅳ)初始浓度、温度对Th(Ⅳ)在钛酸纳米晶须上的吸附影响。结果表明,pH值对Th(Ⅳ)在钛酸纳米晶须上的吸附有显著影响,而离子强度对吸附的影响相对较弱;吸附过程符合准二级动力学方程;吸附等温线符合Langmuir和Freundlich等温模型;通过热力学数据ΔG0、ΔH0和ΔS0分析发现,Th(Ⅳ)在钛酸纳米晶须上的吸附是一个吸热且自发的过程,升高温度有利于Th(Ⅳ)在钛酸纳米晶须上的吸附。Th(Ⅳ)在钛酸纳米晶须上的吸附主要以化学吸附或表面络合为主。Titanate nanowhiskers have been synthesized by a hydrothermal method using titanium dioxide rutile as titanium source. The determination of the structure and morphology was characterized by XRD, FT-IR, SEM and TEM. The results indicate that the titanate nanowhiskers successfully synthesized under hydrothermal conditions of 180 ℃. The adsorption of Th（Ⅳ） on titanate nanowhiskers was studied as a function of contact time, pH values, ionic strength, Th（Ⅳ） initial concentration and temperature under ambient conditions using batch technique. The results indicate that adsorption of Th（Ⅳ） on titanate nanowhiskers was strongly dependent on pH values, but weakly dependent on ionic strength; adsorption kinetics of Th（Ⅳ） on titanate nanowhiskers was in accordance with pseudo second order kinetic model; the adsorption isotherm model consistent with Langmuir isotherm and Freundlich isotherm model. AGo , AH^0 and AS^0 free energy were calculated from experimental data, the results indicate that the adsorption of Th（Ⅳ） on titanate nanowhiskers was a spontaneous and endothermic process, and increases with increasing temperature. The adsorption of Th （Ⅳ） on titanate nanowhiskers was mainly dominated by surface complexation.

关 键 词：钛酸纳米晶须 Th(Ⅳ) 吸附 

分 类 号：O647.32[理学—物理化学]