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4264512 
Journal Article 
Preparation and Li+ Extraction/Adsorption Properties of Lithium-Rich Manganese Oxide in Aqueous Solution 
Ma Li-Wen; Chen Bai-Zhen; Shi Xi-Chang; Feng Da-Wei 
2011 
Yes 
Chinese Journal of Inorganic Chemistry / Wu Ji Hua Xue Xue Bao
ISSN: 1001-4861 
27 
4 
697-703 
WOS:000289812000017 
Spinel lithium-rich manganese oxides of Li2O center dot nMnO(2)(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 center dot 2.25MnO(2) prepared at 350 degrees C consists of pure spinal phase of lithium manganese oxide and exhibits high Li extraction ratio and low Mn dissolution ratio. After acid treatment Li2O center dot 2.25MnO(2) is transformed to lithium ion-sieve. XRD and SEM analyses show that lithium ion-sieve can maintain the spinet 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 center dot g(-1). The Li+ adsorption mechanism was suggested based on FTIR spectroscopy results and the Li+ adsorption behavior was modeled by Langmuir isotherm. 
lithium manganese oxide; lithium ion-sieve; structure; stability; adsorption