Unusual adsorption properties of microporous titanosilicate ETS-10 toward heavy metal lead
Unusual adsorption properties of microporous titanosilicate ETS-10 toward heavy metal lead
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DOI：
10.1021/la026490l
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发表时间：
2003-02
期刊：
影响因子：
3.9
通讯作者：
G. Zhao;Jia Lee;P. A. Chia
中科院分区：
文献类型：
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作者：
G. Zhao;Jia Lee;P. A. Chia
以TiF4为钛源合成了微孔钛硅酸盐ETS-10，并通过X射线衍射、傅里叶变换红外光谱、拉曼光谱、氮气吸附等手段对其进行了表征。通过间歇式方法测量吸附动力学和平衡，研究了 ETS-10 样品对重金属离子 Pb2+ 的吸附特性。据观察，ETS-10 对 Pb2+ 的吸附速率非常快：在 10 mmol/L 溶液中，批量系数为 200 mL/g，需要不到 5 s 的时间即可达到最大吸附容量。动力学数据可以通过伪二阶模型很好地拟合，而平衡数据更适合 Langmuir 等温线而不是 Freundlich 等温线。根据Langmuir 方程预测，ETS-10 对Pb2+ 的最大吸附容量为1.12 mmol/g。这是迄今为止观察到的沸石对 Pb2+ 的最高吸附容量。
Microporous titanosilicate ETS-10 was synthesized by using TiF4 as the Ti source and characterized by using X-ray diffraction, Fourier transform infrared and Raman spectroscopies, and nitrogen adsorption. The adsorption properties of heavy metal ion Pb2+ on the ETS-10 sample were studied by measuring the adsorption kinetics and equilibria using a batch-type method. It has been observed that the adsorption rate of Pb2+ on ETS-10 is extremely rapid: less than 5 s is required to attain maximum adsorption capacity in a 10 mmol/L solution with a batch factor of 200 mL/g. The kinetic data can be fitted very well by a pseudo-second-order model, whereas the equilibrium data are better fitted to the Langmuir isotherm than to the Freundlich isotherm. The maximum adsorption capacity of Pb2+ on ETS-10 as predicted by the Langmuir equation is 1.12 mmol/g. This is the highest adsorption capacity of Pb2+ on zeolites that has been observed so far.