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US 2021/0197170 A1Published application
Filter media for respiratory protection
Assignee3M Innovative Properties Company
InventorMatthew A. Rankin
Life of this patent
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Abstract
A filter media composition includes a ferrihydrite material having an average pore size (BJH) in a range from 1 to 3 nm and a surface area (BET) of at least 200 m2/g or at least 250 m2/g or at least 300 m2/g.
Claims13
A composition comprising:
- a Cu doped ferrihydrite material having an average pore size (BJH method) in a range from 1 to 3 nm and a surface area (BET) of at least 300 m2/g.
A method, comprising:
- combining a hydrated iron (III) salt with a metal dopant salt comprising Cu to form a mixture;
- blending a bicarbonate material with the mixture to form a wet doped ferrihydrite material and salt co-product;
- drying the wet doped ferrihydrite material and salt co-product to a moisture content of less than 10% by wt or less than 5% by wt to form a dried doped ferrihydrite material and salt co-product;
- washing away the salt co-product with water to form a wet doped ferrihydrite material;
- and
- drying the wet doped ferrihydrite material to a moisture content of less than 10% by wt or less than 5% by wt to form a dried doped ferrihydrite material.
3 more elements
Dependencies are inferred from the claim text.