锂离子筛前驱体Li4Mn5O12的制备及性能研究

doi:10.3724/SP.J.1077.2013.12513

无机材料学报 ›› 2013, Vol. 28 ›› Issue (7): 720-726.DOI: 10.3724/SP.J.1077.2013.12513 CSTR: 32189.14.SP.J.1077.2013.12513

锂离子筛前驱体Li₄Mn₅O₁₂的制备及性能研究

许惠^1,2, 陈昌国¹, 宋应华²

(1. 重庆大学化学化工学院重庆 400030; 2. 重庆工商大学环境与生物工程学院重庆 400067)

收稿日期:2012-08-21 修回日期:2012-11-26 出版日期:2013-07-20 网络出版日期:2013-06-19
作者简介:许惠(1978–), 女, 博士研究生. E-mail: xuhui@ctbu.edu.cn
基金资助:
重庆市科委自然科学基金(CSTC2011JJA50004); 重庆市教委科学技术研究项目(KJ100723)

Synthesis and Properties of Lithium Ion-sieve Precursor Li₄Mn₅O₁₂

XU Hui^1,2, CHEN Chang-Guo¹, SONG Ying-Hua²

(1. College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, China; 2. College of Environmental and Bioengineering, Chongqing Technology and Business University, Chongqing 400067, China)

Received:2012-08-21 Revised:2012-11-26 Published:2013-07-20 Online:2013-06-19
About author:XU Hui. E-mail: xuhui@ctbu.edu.cn
Supported by:
Natural Science Foundation of Chongqing (CSTC2011JJA50004); Science and Technology Research Projects of Chongqing Education Commission (KJ100723)

摘要/Abstract

摘要： 吸附法是目前从低锂浓度的盐湖卤水中提取锂的最有前途的方法。采用EDTA-柠檬酸络合法制备了Li₄Mn₅O₁₂前驱体, 经酸浸脱锂后得到对Li⁺具有特殊选择性的锰氧化物锂离子筛。通过热重、XRD、SEM、FT-IR、化学组成、吸附动力学及共存金属离子的分配系数等手段对样品的晶相结构和Li⁺选择性吸附性能进行了研究。结果表明: 煅烧时间对Li₄Mn₅O₁₂前驱体生成有较大影响, 由400℃煅烧24 h所得的前驱体几乎为纯相的Li₄Mn₅O₁₂化合物, 经酸浸脱锂后的离子筛仍保持着与前驱体相同的尖晶石结构; 前驱体Li₄Mn₅O₁₂和离子筛MnO₂均为 200 nm左右的球状颗粒; 离子筛的最大吸附容量为43.1 mg/g, 并具有较好的Li⁺选择性。

关键词: 离子筛, Li₄Mn₅O₁₂, 前驱体, 吸附

Abstract: Adsorption method is the most promising method for extraction of lithium from salt lakes. A new kind of MnO₂ ion-sieves with high Li⁺ selective adsorption property were synthesized. Spinel-type Li₄Mn₅O₁₂ precursors were synthesized by EDTA-citrate complexing method using LiNO₃ and Mn(NO₃)₂·4H₂O as starting materials. MnO₂ ion-sieves with Li⁺ selective adsorption property were prepared by the acid treatment process to extract Li⁺ from the spinel Li₄Mn₅O₁₂ precursors. As-prepared samples were characterized by thermo gravimetric, XRD, SEM, FT-IR and Li⁺ selective adsorption measurements, respectively. The results show that calcination time has a considerable effect on the structure and composition of precursors. The precursor calcined at 400℃ for 24 h has a pure phase of Li₄Mn₅O₁₂. Final MnO₂ ion-sieve and Li₄Mn₅O₁₂ precursor are about 200 nm spherical pellets and have the same structure of spinel. The maximum adsorption capacity of ion-sieve is about 43.1 mg/g and has the good selection for Li⁺.

Key words: ion-sieve, Li₄Mn₅O₁₂, precursor, adsorption

中图分类号:

TQ174

许惠, 陈昌国, 宋应华. 锂离子筛前驱体Li₄Mn₅O₁₂的制备及性能研究[J]. 无机材料学报, 2013, 28(7): 720-726.

XU Hui, CHEN Chang-Guo, SONG Ying-Hua. Synthesis and Properties of Lithium Ion-sieve Precursor Li₄Mn₅O₁₂[J]. Journal of Inorganic Materials, 2013, 28(7): 720-726.

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锂离子筛前驱体Li₄Mn₅O₁₂的制备及性能研究

Synthesis and Properties of Lithium Ion-sieve Precursor Li₄Mn₅O₁₂

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