Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 369, Issue 1-3, Pages 88-94Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2010.08.016
Keywords
Lithium manganese oxide; Substitution; Stability; Adsorption
Categories
Funding
- National Key Technology R&D Program of China [2008BAB35B04]
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Series spinels LiMxMn2-xO4 (M = Ni, Al, Ti; 0 <= x <= 1) were synthesized and a study of their stability and Li+ extraction and adsorption properties in aqueous solution was carried out. XRD analysis shows that pure cation-substituted spinets were obtained for x <= 0.5, impurity or cation disordering occurred when x >= 0.7. Ni and Al are incorporated into the spinel structures with cell contractions; but the incorporated Ti has an opposite effect. All the three cation-substituted spinels LiM0.5Mn1.5O4 (M = Ni, Al, Ti) maintain the spinel structures and morphologies after acid treatment, but their stability and Li+ extraction and adsorption behaviors differ from each other. LiAl0.5Mn1.5O4 shows a relatively high Li extraction ratio and relatively low Mn and Al extraction ratios during acid treatment, and in the subsequent adsorption experiment it shows a better Li+ adsorption performance which fits Langmuir isotherm. LiNi0.5Mn1.5O4 and LiTi0.5Mn1.5O4 do not show satisfying Li+ extraction and adsorption properties because of the significant cell contraction or expansion. (C) 2010 Elsevier B.V. All rights reserved.
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