Silica adsorbent on magnetic substrate
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United States of America Patent
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Sep 10, 2002
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N/A
app pub date -
Nov 28, 2000
filing date -
Jan 21, 1997
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Abstract
Adsorbent particles comprising superparamagnetic and/or low Curie Temperature transition metal-containing cores surrounded by a hydrous siliceous oxide coating can be formed by an aqueous process wherein the core is precipitated from an aqueous solution and a siliceous oxide coating is deposited thereon while complete drying of the core is avoided until after the siliceous oxide is deposited. The resulting siliceous adsorbents exhibit strong superparamagnetic and/or low Curie temperature magnetic properties with low transition metal leachability.
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