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、p H 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、ΔH 0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 depend-ent on pH values,but weakly dependent on ionic strength;adsorption kinetics of Th(Ⅳ)on titanate nanowhis-kers was in accordance with pseudo second order kinetic model;the adsorption isotherm model consistent with Langmuir isotherm and Freundlich isotherm model.ΔG0 ,ΔH 0 andΔS0 free energy were calculated from exper-imental 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.
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