新型锂离子筛HNbO_3的制备及其吸附特性  

Preparation and Adsorption Properties of a New Type Lithium Ion-sieve HNbO_3

作　　者：王昶[1] 田宗美 豆宝娟[1] 孔维怡 WANG Chang;TIAN Zongmei;DOU Baojuan;KONG Weiyi(College of Marine and Environmental Sciences,Tianjin University of Science & Technology,Tianjin 300457,China)

机构地区：[1]天津科技大学海洋与环境学院,天津300457

出　　处：《天津科技大学学报》2017年第2期36-41,共6页Journal of Tianjin University of Science & Technology

基　　金：天津市科委计划项目(14ZCDGNC00097)

摘　　要：采用固相合成法,以Li_2CO_3和Nb_2O_5为原料制得锂铌氧化物LiNbO_3,经硝酸酸洗后得到锂离子筛HNbO_3.并讨论了酸物质的量对LiNbO_3中锂、铌溶出率的影响,研究了HNbO_3的饱和吸附量和吸附特性.结果表明:LiNbO_3经酸洗后,铌的溶损率很小,可忽略不计,而锂的洗脱率为83%,;HNbO_3在含Li^+的混合模拟液中对Li^+的饱和吸附量约为16,mg/g,达到理论值(17.3,mg/g)的92.5%,;吸附过程符合拟二级动力学方程和Langmuir等温吸附方程,这表明HNbO_3对Li^+的吸附属于单分子层吸附,且以化学吸附为主.A new type of lithium ion-sieve HNbO3was prepared through eluting LiNbO3with nitric acid,using Li2CO3andNb2O5as raw materials in a solid state reaction.The relationship between the molar amount of hydrogen ion and the elutionrate of lithium and niobium was discussed.Moreover,the saturated adsorption amount and the adsorption kinetics of HNbO3were studied.It was found that the niobium dissolving rate is about0%,and the extraction rate of lithium is83%,.The saturatedadsorption capacity of Li+is about16mg/g in a mixed simulation solution containing Li+,which reaches92.5%,of thetheoretical value(17.3mg/g).The adsorption process is in conformity with both the pseudo-second-order kinetic equationand the Langmuir isotherm equation,which suggests the adsorption process belongs to monolayer and mainly chemical adsorption.

关 键 词：HNbO3 洗脱 吸附动力学 

分 类 号：TQ135.12[化学工程—无机化工]