Abstract:

With 52.40 nm PMMA microspheres as template, the templates were filled with the prepared precursor solution. The template removed by the method of temperature-programmed roasting to synthesize the porous doped Li₄Ti_4.98Zr_0.02O₁₂ ion sieve. The ion sieve was acid-modified with 0.100 mol·L^-1 hydrochloric acid and characterized by XRD, SEM, saturated exchange capacity, pH curve to test the structure of the ion sieve and adsorption performance. The results show that the prepared ion sieve has a spinel structure with a pore size of about 50 nm. The spinel structure after acid modification has not been destroyed. Ion-sieve exchange capacity is 6.43 mmol Li⁺·g^-1, and it has higher selectivity to Li⁺.

Key words: nano-template, Li₄Ti_4.98Zr_0.02O₁₂, adsorption, ion exchange, selectivity

摘要：

用52.40 nm的PMMA纳米微球作模板，用配制好的前驱液进行填充，并通过程序升温焙烧的方法去除模板，合成多孔掺杂型的Li₄Ti_4.98Zr_0.02O₁₂离子筛；用0.100 mol·L^-1的盐酸对离子筛进行酸改型，并用XRD、SEM、饱和交换容量、pH滴定曲线等进行表征，考察离子筛的结构以及选择吸附性能。结果表明：制备的离子筛为尖晶石结构，平均孔径约为50 nm；酸改型后其尖晶石结构未被破坏；离子筛对Li⁺的饱和交换容量为6.43 mmol Li⁺·g^-1，对Li⁺有较高的选择吸附性。

关键词: 纳米模板, Li₄Ti_4.98Zr_0.02O₁₂, 吸附, 离子交换, 选择性