水热法合成铬掺杂尖晶石型锂离子筛及其锂吸附性能  

Hydrothermal synthesis of doped chromium spinel-type lithium ion-sieve and its lithium absorption properties

作　　者：周惠敏[1] 袁俊生[2] 张亮[1] 付云朋[1] 侯进[1] 

机构地区：[1]中国海洋大学化学化工学院海洋化学理论与工程技术教育部重点实验室,山东青岛266100 [2]教育部海水资源高效利用技术工程研究中心,天津300130

出　　处：《功能材料》2011年第S4期621-624,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(20806019)

摘　　要：以LiOH、H2O2、Mn(NO3)2和Cr(NO3)3.9H2O为原料,直接水热合成出具有尖晶石结构的铬元素掺杂锂离子筛前驱体,再经酸浸脱锂后得到对Li+具有选择吸附性能的掺杂型锂离子筛;采用XRD和IR研究了产物的性能,测定了离子筛在不同pH值的纯锂溶液中对锂的饱和交换容量。结果表明,在LiOH浓度为1.1mol/L,H2O2浓度为0.3mol/L,n(Mn)∶n(Cr)=20,反应温度为160℃,反应12h的条件下,得到Li(Mn0.8193Cr0.1807)2O4,其对锂的最大交换容量达到22.263mg/g,抗溶损性能较未掺杂的前驱体有显著提高。The spinel-type precursor doped by chromium was directly synthesized via the hydrothermal synthesis with the raw materials of Mn(NO3)2,LiOH,H2O2 and Cr(NO3)3·9H2O.The ion-sieve with the selectivity to lithium ion was prepared further by extracting lithium ions from the Li-Cr-Mn-O lattice of the precursor with the acid.The characteristics of the precursor were carried out by XRD and IR,and the ion-exchange properties were measured.The results showed that the almost pure cubic Li(Mn0.8193Cr0.1807)2O4 crystal is obtained at the temperature of 160℃ for 12h,when the LiOH concentration is 1.1moL/L,the H2O2 concentration 0.3mol/L,and the mole ratio of Mn to Cr 20.The maximum absorption capacity of the ion-sieve to the lithium in pure Li solution is 22.263mg/g,and the doped chromium in the ion sieve can make the dissolved manganese reduced.

关 键 词：尖晶石型 锂离子筛 铬 掺杂 离子交换性能 

分 类 号：O647.31[理学—物理化学]