| 三维有序大孔锂离子筛的制备及其交换性能研究 |
| Preparation and Performance Study of Three-Dimensionally Ordered Macroporous Lithium Ion-Sieve |
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| 摘要: 由110 nm聚苯乙烯(PS)微球组装晶体胶体模板，并用此模板合成三维有序大孔(3-dimensionally ordered macroporous, 3DOM)锂离子筛前驱体Li4Ti5O12，用1.0 mol·L-1的盐酸改型制得锂离子筛H4Ti5O12(LiTi-H)。用XRD、SEM、饱和交换容量、pH滴定曲线等表征了材料的形貌、结构和离子交换性能。同时测定了25 ℃时LiTi-H在0.05 mol·L-1 Li+体系吸附锂的动力学数据，并采用吸附动力学Bangham方程和Elovich方程关联离子筛LiTi-H对Li+的离子交换动力学数据。结果表明：PS胶体晶体模板和3DOMLi4Ti5O12锂离子筛前驱体均排列规则有序，大孔直径约90 nm，Li4Ti5O12为尖晶石结构；3DOM Li4Ti5O12酸稳定性好，锂离子筛LiTi-H对Li+具有较高的选择性，对Li+的饱和交换容量达56.70 mg(Li+)·g-1；动力学模型用Elovich模型关联较好，离子筛对Li+的离子交换动力学方程是Q=-26.510 4+11.977 4lnt(25 ℃)。 |
| 关键词: 3DOM 锂离子筛 Li4Ti5O12 离子交换 动力学 |
| 基金项目: |
| Abstract: Colloidal crystal templates were assembled by polystyrene microspheres with 110nm diameter and lithium ion-sieve precursor 3-dimensionally ordered macroporous (3DOM) Li4Ti5O12 were obtained by template method. Lithium ion-sieve H4Ti5O12 (LiTi-H) was preparated after acid retrofit by using 1.0 mol·L-1 HCl. SEM, XRD, Saturated exchange capacity test and pH titration curve test were used to characterize the appearance, structure and ion exchange performance of the oxide. The adsorption kinetic curve of LiTi-H in the system H+-Li+ were measured at 25 ℃ and ion exchange kinetics data of LiTi-H for 0.05 mol·L-1 Li+ were related with Bangham and Elovich adsorption model. The results showed that: PS colloidal crystal templates and lithium ion-sieve precursor 3DOM Li4Ti5O12 were orderly arrangement, aperture was about 90 nm and Li4Ti5O12 was spinel structure; 3DOM Li4Ti5O12 showed good stability for acid and lithium ion-sieve LiTi-H exhibited a high selectivity for Li+. The saturated exchange capacity of Li+ is 56.70 mg(Li+)·g-1. The optimum kinetics model was Elovich model and the optimum kinetics equation was Q=-26.510 4+11.977 4lnt. |
| Keywords: 3DOM lithium ion-sieve Li4Ti5O12 ion-exchange kinetic |
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| 董殿权,毕参参,李 晶,胡哓瑜,林润雄.三维有序大孔锂离子筛的制备及其交换性能研究[J].无机化学学报,2012,28(7):1423-1428. |
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