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activated alumina |
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activated alumina [′ak·tə‚vād·əd ə′lüm·ə·nə] (materials) Highly porous, granular aluminum oxide that preferentially absorbs liquids from gases and vapors, and moisture from some liquids; also used as a catalyst or catalyst carrier, as an absorbent to remove fluorides from drinking water, and in chromatography. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Reacted fluorine gases are
removed after use by scrubbing with activated alumina. The extract was then
dried over anhydrous sodium sulfate and cleaned up using the following
column chromatography procedures: a) layered acidic-basic silica gel
column, eluted with hexane; b) activated alumina column, eluted with
hexane (discarded) followed by elution with 1:1 dichloromethane: hexane
(collected); c) carbon on celite column (4. Activated alumina is a filter medium
that will remove a variety of contaminants, including fluoride, arsenic
(both arsenite and arsenate), and selenium, but it requires periodic
cleaning with an appropriate regenerant such as alum or caustic in order
to remain effective. |
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