Li_4Mn_(0.5)Ti_(0.5)O_4的合成及其交换选择性  

Synthesis of Li_(4)Mn_(0.5)Ti_(0.5)O_(4) and Its Selectivity to Li^(+) Exchange

作　　者：江津河[1] 董殿权[1] 李建隆[1] 

机构地区：[1]青岛科技大学化工学院,青岛266042

出　　处：《应用化学》2006年第4期357-361,共5页Chinese Journal of Applied Chemistry

基　　金：国家自然基金(29376245);山东省科技厅(03110102)资助项目

摘　　要：用共沉淀、热结晶的方法合成了具有尖晶石结构的复合氧化物L i4Mn0.5Ti0.5O4,用X射线衍射仪测定了其晶体结构。酸改型后,测定了对碱金属离子饱和交换容量、分配系数、pH滴定曲线、交换次数等参数。结果表明,L i4Mn0.5Ti0.5O4对L i+有较好的离子筛效应,离子选择性较好,对L i+饱和交换容量达到5.96 mmol/g,同时,Mn4+和Ti4+保持了较低的浸出率。The inorganic ion-exchanger Li4Mn0.5Ti0.5O4 of spinal type was prepared by the coprecipitation/ thermal crystallization method, and was modified by impregnation in an acid. Its ion-exchange properties for alkali ions such as saturation capacity of exchange, distribution coefficient, the pH titration curve and service cycles were determined.Li4Mn0.5Ti0.5O4 was characterized by X-ray diffraction. These results show that this inorganic ion-sieve has better memory effect and exchange selectivity, and higher exchange capacity for Li^＋ , with a saturation exchange capacity for Li^＋ of 5.96 mmoL/g. At the same time, lower extration ratios for Mn^4＋ and Ti^4＋ were maintained.

关 键 词：Li-Mn-Ti复合氧化物 尖晶石型结构 离子筛 离子交换 锂 

分 类 号：O611[理学—无机化学]