# US 5,705,269 A · Modified activated carbon

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- Number: US 5,705,269 A
- Document ID: US5705269A
- Status: Granted
- Kind: A
- Application number: 08/665,579
- Filed: 1996-06-18
- Granted: 1998-01-06
- Earliest claimed: 1994-02-01
- Assignees: Electrophor, Inc.
- Inventors: Alexander V. Pimenov; Alexander I. Lieberman; Joseph L. Shmidt
- Web page: https://patentgrep.com/patent/US5705269A

## CPC

- B01J 39/24: Carbon, coal or tar
- A61L 2/16: using chemical substances
- B01J 20/20: comprising free carbon; comprising carbon obtained by carbonising processes
- C01B 32/354: After-treatment
- C02F 1/283: {using coal, charred products, or inorganic mixtures containing them}
- C02F 2303/04: Disinfection
- Y10T 428/2933: Coated or with bond, impregnation or core
- Y10T 428/298: Physical dimension
- Y10T 428/30: Self-sustaining carbon mass or layer with impregnant or other layer
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An activated carbon is modified to have bactericidal properties and/or an additional ability to remove heavy metals and other toxic substances. Said modified activated carbon is especially suitable for purifying drinking water and can be readily modified to be suitable for various regions with specific tap water impurities. Pursuant to the invention, activated carbon fiber is treated to adsorb a member of the group consisting of cations, anions, organic complex forming agents, surfactants, polyelectrolytes and organic bactericidal compounds.

## Claims

### Claim 1

A modified activated carbon material for removing bacteria from a liquid, comprising activated carbon fiber having an organic bactericidal compound selected from the group consisting of brilliant green, rivanol, benzyl alcohol and zephiran containing active bactericidal groups physically adsorbed thereon, said modified carbon material being capable of binding undesirable bacteria and thus removing same from said liquid.

### Claim 2 (depends on 1)

The activated carbon fiber of claim 1 comprising a carbon fiber 2-10 microns in diameter.

### Claim 3 (depends on 1)

The activated carbon material of claim 1 having adsorbed thereon 10-30 milligrams of brilliant green per gram of modified activated carbon fiber.