关键词: 三维有序大孔, Li1.6Mn1.6O4, 锂离子筛; , 吸附性能

Abstract: Three-dimensionally ordered macroporous spinel lithium manganese oxide Li1.6Mn1.6O4 was fabricated directly by polymethyl methacrylate colloidal crystal template filled with the LiNO3,  Mn(Ac)2•4H2O and citric acid mixed solution and oxidation roasting in the air atmosphere.  After the precursor was delithiated by 0.1 mol/L hydrochloric acid, three-dimensionally ordered macroporous lithium ion-sieve was obtained,  whose macroporous diameter and pore wall thickness were about 240 and 50 nm,  respectively.  The X-ray diffraction results show that Li1.6Mn1.6O4,  lithium ion-sieve and the lithium-adsorbed samples all keep spinel structure. The three-dimensionally ordered macroporous(3DOM) materials present the channel space connecting each other,  which shortens the adsorption equilibrium time of Li+. The delithiation rate of precursor gets 95% at 80 ℃, while the solution loss rates of manganese are less than 2.5% below 60 ℃.  Solution temperature has great influence on the exchange ability of Li+, raising temperature leads to the increase of Li+ and H+ reversible exchange degree, the Li+ maximum adsorption capacity is 56.7 mg/g, but the hydrogens  in the manganese 16d octahedral defect position are difficult to be exchanged. The analyses of pH titration and distribution coefficient Kd indicate that the solid acid has a high selectivity of Li+ in the coexisting solution of Li+, Na+ and K+.

Key words: Three-dimensionally ordered macropore, Li1.6Mn1.6O4, Lithium ion-sieve;  , Adsorption property