| 富锂锂锰氧化物的制备及其在溶液中的抽Li+/吸Li+性能 |
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| 引用本文： | 马立文,陈白珍,石西昌,冯大伟.富锂锂锰氧化物的制备及其在溶液中的抽Li+/吸Li+性能[J].无机化学学报,2011,27(4):697-703. |
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| 作者姓名： | 马立文 陈白珍 石西昌 冯大伟 |
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| 作者单位： | 中南大学冶金科学与工程学院,长沙,410083 |
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| 基金项目： | 国家科技支撑计划"十一五"重大项目，2010年湖南省博士科研创新项目，中央专项中南大学前沿研究计划重点项目 |
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| 摘 要： | 采用柠檬酸配合法合成了系列尖晶石富锂锂锰氧化物Li2O.nMnO2(n=1.75,2.0,2.25,2.5,3.0)。通过X射线衍射(XRD)和酸浸实验发现,350℃合成的Li2O.2.25MnO2具有纯相尖晶石锂锰氧化物结构,且在弱酸性介质中具有较高的锂溶出率和较低的锰溶损率。Li2O.2.25MnO2在酸浸之后转型为锂离子筛。XRD和扫描电子显微镜(SEM)分析发现锂离子筛能够保持尖晶石锂锰氧化物的结构和形貌。吸附实验表明,该锂离子筛在碱性含锂溶液中对Li+具有吸附性能,且吸附容量随着溶液温度和pH值的升高而增大,最高能达到40.14 mg.g-1。通过傅立叶红外光谱(FTIR)研究了锂离子筛的吸附机理,并用Langmuir模型描述了其在LiCl+LiOH溶液中的吸附行为。
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| 关 键 词： | 锂锰氧化物 锂离子筛 结构 稳定性 吸附 |
Preparation and Li+ Extraction/Adsorption Properties of Lithium-Rich Manganese Oxide in Aqueous Solution |
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| MA Li-Wen,CHEN Bai-Zhen,SHI Xi-Chang and FENG Da-Wei.Preparation and Li+ Extraction/Adsorption Properties of Lithium-Rich Manganese Oxide in Aqueous Solution[J].Chinese Journal of Inorganic Chemistry,2011,27(4):697-703. |
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| Authors: | MA Li-Wen CHEN Bai-Zhen SHI Xi-Chang and FENG Da-Wei |
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| Institution: | School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China,School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China,School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China and School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China |
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| Abstract: | Spinel lithium-rich manganese oxides of Li2O·nMnO2(n=1.75,2.0,2.25,2.5,3.0) were synthesized via citric acid complex method.The results of XRD analysis and acid treatment reveal that Li2O·2.25MnO2 prepared at 350 ℃ consists of pure spinel phase of lithium manganese oxide and exhibits high Li extraction ratio and low Mn dissolution ratio.After acid treatment Li2O·2.25MnO2 is transformed to lithium ion-sieve.XRD and SEM analyses show that lithium ion-sieve can maintain the spinel structure and morphology of lithium manganese oxide.The Li+ adsorption experiments show that lithium ion-sieve can adsorb Li+ in alkaline solution and the Li+ adsorption capacities increase with the increase of temperature and pH value of the solution.The maximum Li+ adsorption capacity can reach 40.14 mg·g-1.The Li+ adsorption mechanism was suggested based on FTIR spectroscopy results and the Li+ adsorption behavior was modeled by Langmuir isotherm. |
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| Keywords: | lithium manganese oxide lithium ion-sieve structure stability adsorption |
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