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

作　　者：董殿权[1] 毕参参[1] 李晶[1] 胡哓瑜[1] 林润雄[1] 

机构地区：[1]青岛科技大学化工学院,青岛266042

出　　处：《无机化学学报》2012年第7期1423-1428,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.10576017);山东省中青年科学家科研奖励基金(No.2008BS09004);青岛市科技计划基础研究项目(No.12-1-4-3-(8)-jch);青岛科技大学引进人才科研启动基金(No.0022322)资助项目

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-1Li+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℃)。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 HC1. 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 Li4Ti5O12was 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 41nt.

关 键 词：3DOM 锂离子筛 LI4TI5O12 离子交换 动力学 

分 类 号：O614.111[理学—无机化学] O611.4[理学—化学]