锂离子筛的TiO_2包覆改性研究  

TiO_2 Coating Modification for Lithium Ion Sieve

作　　者：杨喜云 曹改芳[1] 胡长军 王豪 尹周澜 YANG Xiyun;CAO Gaifang;HU Changjun;WANG Hao;YIN Zhoulan(School of Metallurgy and Environment,Central South University,Changsha 410083;College of Chemistry and Chemical Engineering,Central South University,Changsha 410083)

机构地区：[1]中南大学冶金与环境学院,长沙410083 [2]中南大学化学化工学院,长沙410083

出　　处：《材料导报》2017年第A01期435-438,共4页Materials Reports

基　　金：国家自然科学基金(515742860);中国博士后科学基金(2016M592448);中南大学博士后基金

摘　　要：分别以LiOH·H_2O和Mn_2O_3为锂源和锰源,水热合成LiMnO_2,采用溶胶-凝胶法在LiMnO_2表面包覆TiO2,经焙烧-酸洗得到包覆TiO2的离子筛H1.6Mn1.6O4。详细研究了包覆工艺中各因素对离子筛锰溶损率、锂吸附量和钛溶损率的影响,确定了最佳的包覆工艺条件。结果表明,乙醇与钛酸四丁酯物质的量比为34,500℃焙烧6h,表面包覆3%(质量分数)TiO2时的锂离子筛在卤水中锂的首次吸附量为24.30mg/g,锰溶损率为4.50%,钛溶损率为5.70%。循环5次,离子筛的锂吸附量仍保持为19.89mg/g,锰的溶损率降低到0.40%。LiMnO2 was synthesized by hydrothermal method.TiO2 was coated on the surface of LiMnO2 by sol-gel method,followed by calcination tOobtain TiO2-coated Li 1.6 Mn 1.6 O4.The influences of process parameters on the lithium adsorption capacity,Mn and Ti dissolution loss were investigated.The optimum conditions were obtained.Results show that when the mole ratiOof ethanol tOtetrabutyl titanate is 34,the calcination temperature is controlled at 500℃for 6 h,3%(mass fraction)TiO2 coated lithium ion-sieve is obtained with a lithium adsorption capacity of 24.30 mg/g,Mn dissolution loss 4.50%and Ti loss 5.70%.After 5 cycles,the adsorption capacity keeps at 19.89 mg/g and Mn dissolution loss reduces tO0.40%.

关 键 词：锂离子筛 包覆 锰溶损 循环性能 

分 类 号：TQ137.1[化学工程—无机化工]