AP1160A - Product for bactericidal treatment of fluids. - Google Patents
Product for bactericidal treatment of fluids. Download PDFInfo
- Publication number
- AP1160A AP1160A APAP/P/1999/001694A AP9901694A AP1160A AP 1160 A AP1160 A AP 1160A AP 9901694 A AP9901694 A AP 9901694A AP 1160 A AP1160 A AP 1160A
- Authority
- AP
- ARIPO
- Prior art keywords
- product
- metal
- porous support
- silver
- specific surface
- Prior art date
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 6
- 230000000844 anti-bacterial effect Effects 0.000 title claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052709 silver Inorganic materials 0.000 claims abstract description 21
- 239000004332 silver Substances 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 15
- 230000005495 cold plasma Effects 0.000 claims abstract 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 20
- 229910052799 carbon Inorganic materials 0.000 claims description 18
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000010409 thin film Substances 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 238000011109 contamination Methods 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 238000000151 deposition Methods 0.000 claims description 2
- 230000002401 inhibitory effect Effects 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229920002994 synthetic fiber Polymers 0.000 claims 1
- 230000001580 bacterial effect Effects 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 8
- 239000000843 powder Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000005185 salting out Methods 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 102100040141 Aminopeptidase O Human genes 0.000 description 1
- 108050008333 Aminopeptidase O Proteins 0.000 description 1
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- 230000003385 bacteriostatic effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000010849 ion bombardment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 239000008262 pumice Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- -1 silver ions Chemical class 0.000 description 1
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical class [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000004876 x-ray fluorescence Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Carbon And Carbon Compounds (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
Abstract
The invention concerns a product for the bacterial treatment of fluids, characterised in that it consists almost exclusively of a porous support with inner and outer specific surface determined according to needs, for instance activated carbon and of a metal, for instance silver, covering said specific surface in a thin layer substantially uniform over the whole specific, said metal being bound to the porous support by strong bonds such as covalent bonds. The product is obtainable in a cold plasma reactor.
Description
Product for the bactericidal treatment of fluids
Products are known for the bactericidal treatment of water, consisting · of active carbon impregnated with silver in the form of salts obtained by immersing the carbon in a solution of silver nitrates .
Such a product has drawbacks: salting-out of nitrates and salting-out of silver. This is because the impregnation does not make it possible to obtain sufficient bonding between the silver and the carbon and salting-out is inevitable.
The use of this product in the field of potable O water is therefore limited because the concentration of dissolved silver is limited to 0.01 ppm.
In the laboratory, it is known for active ? carbon to be hot metallized with metallic silver in a £“*· chamber in which a very high vacuum has been created.
In this chamber, the silver is evaporated in order to be able to penetrate the carbon. This process allows good diffusion of the silver into the pores of the carbon but the poor bonding of the silver to the carbon results in salting-out of the dissolved silver. The internal structure of the active carbon is completely upset and exhibits significant pollution. This product obtained is more friable and becomes spent with the passage of water. This application does not allow a stable product to be obtained and the manufacture of this product is very difficult, since it takes a long time to obtain the vacuum, and therefore not industrializable.
APO 0 116 0
The object of the present invention is to propose a product which, after treatment, has a much greater bactericidal and bacteriostatic power than the known products and is virtually free of any pollution. Since the bactericidal power depends on the effective surface area of the product, the latter must have a very high useable active surface area.
The product for the bactericidal treatment according to the invention is distinguished by the fact that it consists almost exclusively, on the one hand, of a porous support of defined external and internal specific surface depending on the requirements and, on the other hand, of a metal covering said specific surface as a thin film of approximately ' uniform thickness over the entire specific surface, this metal being bonded to the porous support by strong bonding of the covalent-bond type.
Since the metal is strongly bonded to the porous body, there is no risk of it becoming detached and it may be present as a very thin film of the order of 5 to 10 A. The product is very pure.
The porous support may be inorganic or organic, especially synthetic. It may, for example, consist of active carbon, pumice stone, rock, synthetic resin, etc .
The product has a remanence, that is to say a preservability, inhibiting any subsequent contamination of the fluid treated.
The metal may, for example, be pure metallic silver, or copper, nickel or any other metal having the desired effects.
APO01160
Such a product is obtained by injecting the metal, particularly silver, in atomic form into a porous body, for example active carbon powder immersed in a plasma.
Two examples of how to obtain a product according to the invention, consisting of active carbon and of silver, will be described below.
Example 1:
The active carbon, in powder form, was treated in a radiofrequency (13.56 MHz) capacitively coupled discharge in a reactor. The configuration was chosen so as to obtain a high self-polarization voltage across the space-charge sheath.
The gas used in the reactor is argon - with a flow rate of 20 seem corresponding to a pressure of 1 Pa - and the RF electric power coupled to the gas is 400 W. This coupling takes place through an L-type impedance-matching box. Since the space-charge sheath has a width of approximately 1.5 cm, the intensity of the electric field in the sheath is 5.3 104 Vm1. Under these conditions, the density of the plasma is estimated to be 10-10 cm'3.
·*— o
The active carbon powder particles are immersed in the plasma where they are consequently subjected to continuous ion bombardment. The effect of this bombardment is to heat the carbon within the actual plasma. The ion flux reaching the surface of the carbon powder particles is estimated to be 7.3 χ 1012 ions. s'1.
The silver is injected in atomic form into the gas phase. The effect of the plasma is to create anchoring sites for the silver atoms. This anchoring
APO01160 therefore results in strong C-Ag atomic bonding of the covalent-bond type. Thus, the silver aggregates observed in a scanning electronic microscope are firmly bonded to the carbon support and cannot be salted-out.
The physico-chemical analyses carried out on the carbon powder particles thus treated show a proportion of silver of 57% on the external surface of the carbon. As regards the proportion of silver which diffuses into the volume of the carbon, through the pores of the powder particles, this may be modulated by varying the physical parameters of the discharge. In addition, X-ray fluorescence analyses reveal a very negligible, if not zero, level of pollution compared with that of powder particles treated by chemical impregnation means. This result is due to the fact that the carbon powder particles are exposed to a controlled gaseous environment - in the example in question an inert gas - serving only as a carrier for the metallization. Consequently, any pollution is reduced as far as possible.
It should furthermore be pointed out that this process is integrated: no post-treatment, for example thermal post-treatment, is necessary. The powder particles are treated in one go for a well-defined time, for example 20 minutes.
Example II:
Argon is injected via the base of the reactor, by pumping at the top of the reactor. The virgin active carbon, coming from calcined coconuts, and the N6-grade pure silver (that is to say silver having a purity equal to 99.9999%) are placed in powder form in a rotary drum allowing these powders to be bathed in a
AP O 0 116 0 plasma remote from the pumping valve. A high-intensity electric field is created in the reactor in order to levitate the powder particles in the plasma. Under these conditions, the plasma density is approximately 10’9 cm’3 and the electron and ion temperatures are 3 eV and 0.03 eV, respectively.
The active carbon granules are immersed in the plasma and, consequently, subjected to continuous bombardment by silver ions. The effect of this bombardment is to raise the temperature of the carbon to approximately 900°C.
The working parameters are as follows:
- argon flow rate: approx. 9 seem minute);
- working pressure: 2 Pa;
- plasma excitation power: 100 W;
- self-polarization voltage: 1.2 χ 105
- deposition time: 25 minutes
- deposited thickness: 5 to 10 A.
The deposited thickness is nanometric. It corresponds to an internal density of Ag of greater than 4%.
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Claims (8)
1. A product for the bactericidal treatment of fluids, consisting of a porous support coated with a metal, the metal covering the internal and external specific surface of the porous body wherein the layer is thin and of approximately uniform thickness over the entire specific surface, that is to say also the internal surface of the pores, the metal being bonded to the porous support by strong bonding of the covalent-bond type.
ΑΡ»01160
2. The product as claimed in claim 1, wherein the metal is pure metal silver (Ag°), copper or nickel.
3. The product as claimed in claim 1 or 2, wherein the porous support consists of active carbon, or any other organic or inorganic or synthetic material.
o
4. The product according to one of claims 1 to 3, wherein the thickness of the layer may be modulated.
5. The product as claimed in one of claims 1 to 4, which has a remanence inhibiting any subsequent contamination of the fluid treated.
a
6. A process for obtaining the product as claimed in one of claims 1 to 5, consisting in depositing a metal as a thin film on a porous support by treating the porous support in a cold-plasma reactor by immersing the porous body in an inert-gas plasma, wherein the metal is injected in atomic form into the gas plasma, subjecting the porous support to an electric filed of greater than 5,3 104 Vm'1.
7. The process as claimed in claim 6, wherein the porous support is treated in a reactor having a space-charge sheath with a width equal to approximately 1.5 cm.
8.
The process as claimed in claim 6, wherein the inert gas is argon.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH93497A CH691592A5 (en) | 1997-04-22 | 1997-04-22 | Process for obtaining carbon granules impregnated with silver. |
| CH224297A CH691683A5 (en) | 1997-09-23 | 1997-09-23 | Stable bactericidal product for water treatment |
| PCT/IB1998/000610 WO1998047819A1 (en) | 1997-04-22 | 1998-04-22 | Product for bactericidal treatment of fluids |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AP9901694A0 AP9901694A0 (en) | 1999-12-31 |
| AP1160A true AP1160A (en) | 2003-06-30 |
Family
ID=25686156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| APAP/P/1999/001694A AP1160A (en) | 1997-04-22 | 1998-04-22 | Product for bactericidal treatment of fluids. |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP0979212B1 (en) |
| CN (1) | CN1108994C (en) |
| AP (1) | AP1160A (en) |
| AT (1) | ATE329883T1 (en) |
| AU (1) | AU6848698A (en) |
| DE (1) | DE69834912T2 (en) |
| ES (1) | ES2270512T3 (en) |
| OA (1) | OA11208A (en) |
| PT (1) | PT979212E (en) |
| WO (1) | WO1998047819A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120138526A1 (en) * | 2009-07-13 | 2012-06-07 | Serigne Dioum | Product for removing pollutants from a fluid, and method for producing same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4407865A (en) * | 1981-06-09 | 1983-10-04 | Atlantic Richfield Company | Process for coating a sterilizing filter material with silver and product formed thereby |
| FR2585694A1 (en) * | 1982-10-15 | 1987-02-06 | Someya Nobuo | Water sterilising agent |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2205515Y (en) * | 1994-12-23 | 1995-08-16 | 国营华北光学仪器厂 | Low temperature plasma air purifier |
| JPH09108654A (en) * | 1995-10-16 | 1997-04-28 | Nisshin Steel Co Ltd | Activated carbon for purifying water |
| WO1998015337A2 (en) * | 1996-10-10 | 1998-04-16 | Marcel Huder | Solid filter |
-
1998
- 1998-04-22 AP APAP/P/1999/001694A patent/AP1160A/en active
- 1998-04-22 PT PT98913975T patent/PT979212E/en unknown
- 1998-04-22 CN CN98805426A patent/CN1108994C/en not_active Expired - Fee Related
- 1998-04-22 ES ES98913975T patent/ES2270512T3/en not_active Expired - Lifetime
- 1998-04-22 AT AT98913975T patent/ATE329883T1/en not_active IP Right Cessation
- 1998-04-22 DE DE69834912T patent/DE69834912T2/en not_active Expired - Fee Related
- 1998-04-22 EP EP98913975A patent/EP0979212B1/en not_active Expired - Lifetime
- 1998-04-22 WO PCT/IB1998/000610 patent/WO1998047819A1/en not_active Ceased
- 1998-04-22 AU AU68486/98A patent/AU6848698A/en not_active Abandoned
-
1999
- 1999-10-22 OA OA9900235A patent/OA11208A/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4407865A (en) * | 1981-06-09 | 1983-10-04 | Atlantic Richfield Company | Process for coating a sterilizing filter material with silver and product formed thereby |
| FR2585694A1 (en) * | 1982-10-15 | 1987-02-06 | Someya Nobuo | Water sterilising agent |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120138526A1 (en) * | 2009-07-13 | 2012-06-07 | Serigne Dioum | Product for removing pollutants from a fluid, and method for producing same |
| US10118838B2 (en) * | 2009-07-13 | 2018-11-06 | Serigne Dioum | Product for removing pollutants from a fluid, and method for producing same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1257463A (en) | 2000-06-21 |
| WO1998047819A1 (en) | 1998-10-29 |
| ES2270512T3 (en) | 2007-04-01 |
| EP0979212A1 (en) | 2000-02-16 |
| CN1108994C (en) | 2003-05-21 |
| DE69834912T2 (en) | 2007-02-15 |
| AU6848698A (en) | 1998-11-13 |
| DE69834912D1 (en) | 2006-07-27 |
| EP0979212B1 (en) | 2006-06-14 |
| PT979212E (en) | 2006-11-30 |
| AP9901694A0 (en) | 1999-12-31 |
| OA11208A (en) | 2003-05-16 |
| ATE329883T1 (en) | 2006-07-15 |
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