摘要
具有尖晶石型结构的化合物能够在插入大量替代离子改变自身锂和氧化学计量数的同时保持结构的稳定性,这种特性能够被用于离子交换研究,用来满足提取锂的需求。通过检测尖晶石型复合金属氧化物的饱和交换能力、分配系数等,可以确定其具体特性。本文利用共沉淀/固相反应热结晶方法,合成尖晶石型复合金属氧化物Mg_(1.5)Mn_(0.5)Ti_(0.75)O_4。实验结果表明,经酸化的Mg_(1.5)Mn_(0.5)Ti_(0.75)O_4,其Mg^(2+)的抽出比率高达72%,Mn^(4+)和Ti^(4+)的溶解比率低于8.2%。实验分析表明,无机离子交换剂Mg_(1.5)Mn_(0.5)Ti_(0.75)O_4对Li^+有较好的离子筛效应,离子选择性较好,酸化后的样品对Li^+的离子交换能力高达10.6mmol·g^(-1)。
The substance with spinel type structure can insert a large number of alternative ions and change the stoichiometric number in lithium and oxygen,meanwhile,it can keep the stability of spinel type structure. This characteristic can be used for ion exchange study to meet the requirement of extracting lithium. The characteristics of spinel type composite metal oxide can be measured by the value of saturation exchange capacity and distribution coefficient. The spinel type composite Mg1.5Mn0.5Ti0.75O4 was synthesized by the method of co-precipitation/solid state reaction thermal crystallization. The experimental results showed that Mg1.5Mn0.5Ti0.75O4 which was treated by nitric acid can extract more than 72% of Mg2＋,while the dissolutions of Mn4＋and Ti4）were less than 8. 2%. The results also indicated that Mg1.5Mn0.5Ti0.75O4 has a good ion-sieve effect on Li＋. Its ion exchange capacity for Li~＋is up to 10. 6 mmol·g-1.
出处
《化学通报》
CSCD
北大核心
2017年第9期880-883,共4页
Chemistry
基金
国家自然科学基金项目(51541205)资助
关键词
尖晶石型结构
复合金属氧化物
合成
离子交换能力
Spinel type structure
Combined metal oxide
Synthesis
Ion exchange capability
