Hydrogen manganese oxide (HMO) has been widely investigated for recovery of lithium (Li) from seawater. For a practical application, it is essential to obtain a granulated HMO. However, granulation of HMO interferes seawater diffusion, thereby decreasing the Li adsorption performance. To minimize the hindrance of Li adsorption performance, macroporous LMO/Al 2 O 3 (MLA) was synthesized in this study. Highly porous γ-Al 2 O 3 results in plenty of mesopores in cylindrical LMO/Al 2 O 3 . In addition, macropore is induced in LMO/Al 2 O 3 by addition of hydrogel beads. During calcination, the hydrogel beads decomposed, leaving spherical macropores (500–1000 μm). After delithiation, Li adsorption performance of MLAs was evaluated in Li-spiked seawater. At high Li concentrations, all MLAs exhibited similar Li adsorption capacities. However, at low Li concentration (<50 mg/L), only MLA with the highest macropore density (porosity ≈ 60.3%) showed Li uptakes similar to that of HMO powder. In a dilute Li solution, such as seawater, the Li adsorption driving force was weak, and Li preferentially reacted with the HMO in macropore rather than with that of mesopores.
No takes yet. Share an insight, caveat, or question.
Hong et al. (2019) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: