| 富锂锂锰氧化物的制备及其在溶液中的抽Li+/吸Li+性能 |
| Preparation and Li+ Extraction/Adsorption Properties of Lithium-Rich Manganese Oxide in Aqueous Solution |
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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。 |
| 关键词: 锂锰氧化物 锂离子筛 结构 稳定性 吸附 |
| 基金项目: |
| 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. |
| Keywords: lithium manganese oxide lithium ion-sieve structure stability adsorption |
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| 摘要点击次数: 1850 |
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| 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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