华南理工大学学报(自然科学版) ›› 2007, Vol. 35 ›› Issue (6): 81-85.

• 化学化工 • 上一篇    下一篇

正尖晶石型LiMn2O4 的制备及性能

袁文辉1 王蝉月1  李莉2   

  1. 1.华南理工大学 广东省绿色化学品重点实验室,广东 广州 510640;2. 华南理工大学 环境科学与工程学院,广东 广州 510640
  • 收稿日期:2006-07-21 出版日期:2007-06-25 发布日期:2007-06-25
  • 通信作者: 袁文辉(1969-),博士,副教授,主要从事吸附和膜催化分离研究. E-mail:cewhyuan@scut. edu.cn
  • 作者简介:袁文辉(1969-),博士,副教授,主要从事吸附和膜催化分离研究.
  • 基金资助:

    广东省自然科学基金资助项目(04020126 )

Preparation and Property of Normal Spinel LiMn2O4

Yuan Wen-hui wang Chan-yue1  Li Li2   

  1. 1. Guangdong Provincial Key Laboratory of Green Chemicals , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China ;2. School of Environmental Science and Engineering , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China
  • Received:2006-07-21 Online:2007-06-25 Published:2007-06-25
  • Contact: 袁文辉(1969-),博士,副教授,主要从事吸附和膜催化分离研究. E-mail:cewhyuan@scut. edu.cn
  • About author:袁文辉(1969-),博士,副教授,主要从事吸附和膜催化分离研究.
  • Supported by:

    广东省自然科学基金资助项目(04020126 )

摘要: 采用乙二胺四乙酸-柠棒酸( EDTA-CA) 络合法,以硝酸锂、硝酸锰为原料制备了正尖晶石型LiMn2O4 超细粉末晶体,采用FTIR、TG-DSC 、XRD 、SEM 、TEM 和BET 等手段对LiMn2O4 的前驱体及LiMn2O4 粉末进行了表征.结果表明:当Li/Mn摩尔比为0.6 、(Mn +Li)/(EDTA + CA) 摩尔比为0.5 时,在600 ℃下:煅烧4h ,制备出的LiMn2O4 粉末为正尖晶石型,其BET 比表面积为7. 9948m2 /g ,粒径小至40 nm ,有轻微团聚. LiMn2O4脱嵌后对Li+的最大吸附容量达5.3mmol/g.

关键词: &lambda, -MnO2, LiMn2O4, 络合, 吸附容量

Abstract:

Super-fine powders of norrnal spinel LiMn2O4 were synthesized by means of EDTA-citric acid (EDTACA) chelating method , with the nitrates of lithium and manganese as the starting materials. The precursor of LiMn2O4 and the synthesized LiMn2O4 powders were then characterized by FTIR, TG-DSC , XRD , SEM , TEM and BET mea-surements. The results show that , when values of n Li:n Mn and n Mn + Li :nEDTA+CA are respectively 0. 6 and 1: 2 , norrnal spinel LiMn2O4 with slight agglomeration can be synthesized after a calcination for 4h at 600℃ , and the BET specific surface area is 7. 9948m2/g with diameter being as small as 40nm. It is also found that the largest lithium adsorption capacity of the leached LiMn2O4 reaches up to 5. 3 mmol/g.

Key words: λ-MnO2 , LiMn2O4, chelating, adsorption capacity