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US 2004/0168985 A1Published application
Method of manufacturing a coated zeolite adsorbent
AssigneeChK Group, Inc.
InventorRajan K. Vempati
Life of this patent
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Abstract
The present invention is directed to an adsorbent for removing arsenic species from ground water and/or surface water systems. Such adsorbent removes both As(III) and As(V), thereby providing potable water. Also provided is a method and/or device (e.g., filter) for removing arsenic species from contaminated waters utilizing such adsorbent.
Claims37
An adsorbent for an arsenic species, wherein said adsorbent is an Fe- and Mn-oxide.
A method of producing a zeolite coated with nanophase Mn—Fe oxide, comprising the steps of:
- (a) producing Fe oxide solution from a Fe-containing compound;
- (b) adding a Mn-containing compound to the Fe oxide solution to obtain Fe—Mn solution;
- (c) adding a zeolite to the Fe—Mn solution to form a mixture;
- (d) filtering the mixture;
- and
- (e) drying the filtered product, thereby producing a zeolite coated with nanophase Mn—Fe oxide.
3 more elements
A method of removing arsenic having various valence states from arsenic-contaminated waters, comprising the steps of:
- (a) oxidizing the arsenic having lower valence states to arsenic having higher valence states in said arsenic-contaminated waters;
- and
- (b) removing the oxidized and native arsenic having higher valence states from said waters.
Dependencies are inferred from the claim text.