Water-purifying material, a process for manufacturing the same and a process for purifying water

• US 5,342,528 A
• Filed: 04/01/1993
• Issued: 08/30/1994
• Est. Priority Date: 04/09/1992
• Status: Expired due to Fees

• Current Assignee: Japan Envirochemicals Ltd. (Osaka Gas Company Limited)
• Original Assignee: Takeda Chemical Industries, Ltd. (Takeda Pharmaceutical Company Limited)
• Inventors: Suzuki, Masayuki, Uda, Yasuaki, Adachi, Kiyoshi
• Primary Examiner(s): Nessler, Cynthia L.
• Application Number:
  US08/041,186
• Time in Patent Office: 516 Days
• Field of Search: 502/183, 502/184, 502/417, 502/416, 502/410, 502/251, 502/411, 502/7, 502/414, 502/415, 422/19, 422/28, 210/764, 210/501, 210/502.1, 210/763, 210/694, 210/663, 210/679, 210/668
• US Class Current: 210/668
• CPC Class Codes: C02F 1/283 using coal, charred products, or inorganic mixtures containing them
• CPC Class Codes: C02F 1/505 by oligodynamic treatment

Abstract

A water purifying material containing (1) an activated carbon having (a) silver and/or an inorganic silver compound and (b) a water soluble alkaline earth metal salt supported thereon and (2) a bone-char, which can significantly inhibit the dissolution of silver and can be used for a long period of time.

Claims

1. A process for purifying water which comprises contacting the water with a water-purifying material comprising (1) an activated carbon having (a) silver and/or an inorganic silver compound and (b) a water-soluble alkaline earth metal salt supported thereon and (2) a bone-char.

2. A water-purifying material comprising ( 1 ) an activated carbon having (a) silver and/or an inorganic silver compound and (b) a water-soluble alkaline earth metal salt supported thereon and (2 ) a bone-char.

3. The water-purifying material of claim 2 wherein the amount of the silver and/or inorganic silver compound to the activated carbon is 0.05-0.5% by weight calculated as metal.

4. The water-purifying material of claim 2 wherein the amount of the water-soluble alkaline earth metal salt to the activated carbon is 0.05-0.5% by weight calculated as metal.

5. The water-purifying material of claim 2 wherein the amount of the bone-char to the activated carbon is 3-7% by weight in the water-purifying material.

6. The water-purifying material of claim 2 wherein the inorganic silver compound is silver chloride, silver bromide, silver iodide, silver nitrate, silver sulfate, silver phosphate, silver sulfide, silver chlorate, silver silicate or silver oxide.

7. The water-purifying material of claim 2 wherein the inorganic silver compound is silver nitrate.

8. The water-purifying material of claim 2 wherein the water soluble alkaline earth metal salt is magnesium nitrate, calcium nitrate, barium nitrate or magnesium sulfate.

9. The water-purifying material of claim 2 further comprising sepiolite.

10. The water-purifying material of claim 9 wherein the amount of sepiolite is 3-7 % by weight in the water purifying material.

11. The water-purifying material of claim 2 wherein the water purifying material is made by a process which comprises supporting (a) silver and/or an inorganic silver compound and (b) a water soluble alkaline earth metal salt on an activated carbon, and mixing the resulting activated carbon with the bone-char.

12. The water-purifying material of claim 11 wherein the supporting of (a) the silver and/or the inorganic silver compound and (b) the water soluble alkaline earth metal salt on the activated carbon is achieved by spraying a solution or suspension of (a) silver and/or the inorganic silver compound and (b) the water soluble alkaline earth metal salt on the activated carbon.