离子筛MnO_2·0.4H_2O的固相法制备及特性研究  

Study on properties of lithium ion-sieve MnO_2·0.4H_2O prepared by solid state reaction

作　　者：王昶[1] 王希[1] 翟炎龙[2] 酒井裕司 豆宝娟[1] 

机构地区：[1]天津科技大学海洋科学与工程学院,天津300457 [2]天津科技大学材料科学与化学工程学院 [3]工学院大学工学部环境能源化学科

出　　处：《无机盐工业》2014年第10期18-22,共5页Inorganic Chemicals Industry

基　　金：国家科技支撑计划项目(2011BAC11B05)

摘　　要：以单水氢氧化锂和四氧化三锰为原料,用固相法制备出锂离子筛锰酸锂,改变n(锂)/n(锰)之后,用同样的方法制备出另一物质Li1.33Mn1.67O4,经硝酸洗涤脱锂后制备了锂离子筛MnO2·0.4H2O。测定了酸洗时前驱体的锂洗脱率、锰溶损率,研究了锂离子筛MnO2·0.4H2O的饱和吸附量、稳定性、pH滴定曲线。结果表明,前驱体Li1.33Mn1.67O4经硝酸二次酸洗后,锂洗脱率和锰溶损率分别为62.7%和6.0%。在含0.1 mol/L氢氧化钠和10 mmol/L氯化锂的溶液中,经固相法制备的锂离子筛MnO2·0.4H2O对锂离子的饱和吸附量达到24.6 mg/g,并且具有较好的稳定性,pH滴定曲线表明锂离子筛对锂离子具有很好的选择性。Lithium ion-sieve,MnO2 .0.4H2O was obtained from spinel type precursor,Li1.33Mn1.67 O4,treated with nitric acid. Li1.33Mn1.67O4 was synthesized from LiMn2O4which was prepared with LiOH· H2O and Mn3O4 by solid state method with different amount-of-substance ratios of Li to Mn.Lithium extraction rate and manganese dissolving loss rate were determined, and saturated adsorption capacity, stability,and pH titration curve of lithium ion-sieve were also studied.The results suggested that the lithium extraction rate and the manganese dissolving loss rate were 62.7% and 6.0%, respectively, after the precursor was washed secondarily by nitric acid.In a 0.1 mol/L NaOH and 10 mmol/L LiCl mixed solution, the saturated adsorption ca- pacity of MnO2·0.4H2O for Li＋ was 24.6 mg/g,and lithium ion sieve had a good stability, pH titration curves suggested that lithium ion sieve MnO2· 0.4H2O presented excellent selectivity for Li＋.

关 键 词：锂离子筛 固相法 吸附 Li1.33Mn1.67O4 MnO2·0.4H2O 

分 类 号：TQ137.12[化学工程—无机化工]