溶融塩中リチウムイオン吸着能力に対する活性アルミナの表面特性依存性

概要

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It was reported ill our previous work that activated alumina had been successfully applied to selective adsorp tion of lithium ions in molten NaNO_3 at a high temperature. In the present work, the activated alumina samples were prepared by heat treatment of conunercially available alumina sol at different temperatures. Their physical properties were measured, then their adsorp tion uptake of lithium ions were evaluated. Amorphous alumina showed higher adsorption uptake of lithium ions than any other phases of alumina and the uptake in creased in proportion to the surface area of activated alunrina. The lithium ion uptake per unit surface area varied slightly with the phase of alumina, implying that the surface microstructure of each activated alumi na has a different adsorptive capability for lithium ions. Since the mean pore radius of each activated alu mina sample was at least forty times larger than the ionic radius of lithium, it may be concluded that there is little effect of the pore size on adsorptive capabilities for lithium ions.
社団法人日本セラミックス協会の論文
1994-12-01