单宁为模板制备纳米二氧化钛 及其对钍的吸附性能

以杨梅单宁(BT)为模板,水热法合成纳米二氧化钛(BT-NTO)。采用XRD、FTIR、SEM和TEM技术对BT-NTO的结构及形貌进行了表征。将BT-NTO用于吸附溶液中的Th~(4+),在溶液pH为3.5、温度为25℃、Th~(4+)初始浓度为0.5 mmol/L的条件下,BT-NTO对Th~(4+)的吸附量为0.905 8 mmol/g;吸附过程符合准二级动力学方程和Langmuir等温吸附方程;溶液中共存的Zn~(2+)、Ni~(2+)、Co~(2+)、Sr~(2+)、Yb~(3+)、Nd~(3+)、Sm~(3+)、Gd~(3+)、La~(3+)、Cl-、ClO4-离子对Th~(4+)吸附量影响较小;BT-NTO的重复使用性能较好。

Preparation of nano TiO2 with tannin as template and its adsorption capability to Th4+

In this work,nano titanium dioxide with bayberry tannin as template （BT-NTO） was synthesized by hydrothermal method. The structure and morphology of BT-NTO were characterized by XRD,FTIR,SEM and TEM. Then the prepared BT-NTO was used to adsorb Th⁴⁺ from aqueous solution. Theadsorption capacity of BT-NTO to Th⁴⁺ was 0.905 8 mmol/g at pH 3.5,25 ℃ and initial Th⁴⁺ concentration of 0.5 mmol/L. Theadsorption process of Th⁴⁺ on BT-NTO can be better described with pseudo-second-order kinetics and Langmuir isotherm models,respectively. Furthermore,the coexisted ions,including Zn²⁺,Ni²⁺,Co²⁺,Sr²⁺,Yb³⁺,Nd³⁺,Sm³⁺,Gd³⁺,La³⁺,Cl^-,ClO₄^-,exhibit little impact on Th⁴⁺ adsorption. The BT-NTO presents a good reusability.