摘要
选用溶剂热法,通过焙烧得到添加F127的锂钛复合氧化物(Li4Ti5O12),经0.1 mol·L-1盐酸浸渍酸改制备出锂离子筛。经TG-DTG、XRD、SEM及性能测试,考察了离子筛的晶相、形貌及选择稳定性。结果表明:在800℃下焙烧得到的离子筛为尖晶石结构,晶相较纯,颗粒大小均匀,盐酸浸渍后酸改率为88.60%,且酸改前后晶型及表面颗粒形貌保持不变;离子筛的饱和吸附容量为6.6480 mmol·g-1,经过5次循环吸脱附试验后离子筛的饱和交换容量保持在6.6324 mmol·g-1,在单一离子溶液中以及混合离子溶液中均表现出对Li+较高的吸附性能,说明IE-H1离子筛具有优良的稳定性及选择吸附性能。
Li4Ti5O12(LTZO)samples with addition of F127 were prepared by the solvothermal method.After leaching with 0.1 mol·L-1 HCl solution,these samples were transformed into lithium ion-sieves(IE-H).The crystal phase,morphology and selective stability of ion sieves were characterized by TG-DTG,XRD and SEM techniques.Moreover,the adsorption performance of ion sieves was tested.The results showed that the ion sieves calcined at 800℃had the spinel structure with a relatively pure crystal phase and uniform particle sizes.The acid modification rate after immersion in hydrochloric acid was 88.60%,and the crystal form and surface particle morphology remained unchanged before and after acid modification.The saturated Li+exchange capacity of the IE-H was up to 6.6480 mmol·g-1,and remained at 6.6324 mmol·g-1 after 5 cycles of Li+extraction tests.Besides,the IE-H had high adsorption capacity for Li+in single ion solution and mixed ion solution,suggesting the high exchange capacity and stability of the prepared ion-sieve.
作者
孟祥坤
贺帅
刘银凤
尹民
董殿权
MENG Xiang-kun;HE Shuai;LIU Yin-feng;YIN Min;DONG Dian-quan(College of Chemical Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)
出处
《当代化工》
CAS
2020年第11期2388-2392,共5页
Contemporary Chemical Industry
基金
国家自然科学基金(项目编号:No.51272114)
山东省重点研发计划(项目编号:2019GGX102034)
关键词
溶剂热法
F127
锂离子筛
饱和吸附容量
选择性
循环稳定性
Solvothermal method
F127
Lithium ion sieve
Saturation adsorption capacity
Selectivity
Cyclic stability
作者简介
孟祥坤(1994-),女,山东省聊城市人,硕士在读,研究方向:传质与分离。E-mail:mengxiangkun52@163.com;通讯作者:董殿权(1969-),男,教授,博士,研究方向:传质与分离。E-mail:dongdianquan@sohu.com。
