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WO2012025943A4 - Method for purifying water by contacting water with a porous rice husk ash and clay mixture and apparatus therefor - Google Patents

Method for purifying water by contacting water with a porous rice husk ash and clay mixture and apparatus therefor Download PDF

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Publication number
WO2012025943A4
WO2012025943A4 PCT/IN2011/000579 IN2011000579W WO2012025943A4 WO 2012025943 A4 WO2012025943 A4 WO 2012025943A4 IN 2011000579 W IN2011000579 W IN 2011000579W WO 2012025943 A4 WO2012025943 A4 WO 2012025943A4
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WO
WIPO (PCT)
Prior art keywords
disinfectant
porous media
rha
clay
treated
Prior art date
Application number
PCT/IN2011/000579
Other languages
French (fr)
Other versions
WO2012025943A1 (en
Inventor
Shankar Balajirao Kausley
Rajshree Amrut Patil
Original Assignee
Tata Consultancy Services Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tata Consultancy Services Limited filed Critical Tata Consultancy Services Limited
Publication of WO2012025943A1 publication Critical patent/WO2012025943A1/en
Publication of WO2012025943A4 publication Critical patent/WO2012025943A4/en

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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
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C02F1/003—Processes for the treatment of water whereby the filtration technique is of importance using household-type filters for producing potable water, e.g. pitchers, bottles, faucet mounted devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
    • B01J20/28004—Sorbent size or size distribution, e.g. particle size
    • B01J20/28007—Sorbent size or size distribution, e.g. particle size with size in the range 1-100 nanometers, e.g. nanosized particles, nanofibers, nanotubes, nanowires or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/2803—Sorbents comprising a binder, e.g. for forming aggregated, agglomerated or granulated products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28033—Membrane, sheet, cloth, pad, lamellar or mat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/3078—Thermal treatment, e.g. calcining or pyrolizing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3202—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the carrier, support or substrate used for impregnation or coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
    • B01J20/3234—Inorganic material layers
    • B01J20/3236—Inorganic material layers containing metal, other than zeolites, e.g. oxides, hydroxides, sulphides or salts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
    • B01J2220/46—Materials comprising a mixture of inorganic and organic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
    • B01J2220/48—Sorbents characterised by the starting material used for their preparation
    • B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
    • B01J2220/485—Plants or land vegetals, e.g. cereals, wheat, corn, rice, sphagnum, peat moss
    • 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
    • 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2307/00—Location of water treatment or water treatment device
    • C02F2307/04—Location of water treatment or water treatment device as part of a pitcher or jug
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2307/00—Location of water treatment or water treatment device
    • C02F2307/06—Mounted on or being part of a faucet, shower handle or showerhead

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Nanotechnology (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Composite Materials (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

The subject matter described herein relates to purification of water. In one implementation, a disinfectant treated porous media (118) is provided for purification of water. The disinfectant treated porous media (118) includes at least one porous media treated with a disinfectant. Further, the at least one porous media further includes rice husk ash (RHA) and clay.

Claims

AMENDED CLAIMS received by the International Bureau on 20 February 2012 (20.02.12)
1. A disinfectant treated porous media (118) for water purification, the disinfectant treated porous media (118) comprising:
rice husk ash (RHA) having a size selected from a range of about 10 micrometer (μm ) to 600 μm ; and
clay having a size selected from a range of about 10 μm to 800 μm , wherein at least one of the clay and the RHA includes in-situ generated nano particles of a metal disinfectant.
2. The disinfectant treated porous media (118) as claimed in claim 1, wherein the at least one porous media comprises:
the RHA in a range of about 10 % to 90 % by weight; and
the clay in a range of about 10 % to 90 % by weight.
3. The disinfectant treated porous media (118) as claimed in claim 1, wherein the at least one disinfectant treated porous media (118) is fabricated by heating a mixture of RHA and clay in a temperature range of about 500 °C to 1500 °C.
4. The disinfectant treated porous media (118) as claimed in claim 1, wherein the at least one porous media further comprises a binder selected from the group consisting of polyvinyl alcohol, epoxy resin, gum, maltodextrin, lactose, polyvinylpyrrolidone (PVP), polyethylene, polypropylene, polyolefin, cellulose ethers, bentonite, and combinations thereof.
5. The disinfectant treated porous media (1 18) as claimed in claim 1, wherein the metal disinfectant is at least one of nano silver, nano copper, nano aluminum, nano zinc, nano copper oxide, nano iron oxide, nano aluminum oxide, and nano titanium dioxide.
6. The disinfectant treated porous media (118) as claimed in claim 1, wherein pore sizes in the at least one disinfectant treated porous media (118) vary in a range of about 1 μm. to 10 μηι based on size of the RHA.
7. The disinfectant treated porous media (118) as claimed in claim 1 or claim 3, wherein the size of the RHA is selected from the range of about 10 micrometer ( μm.) to 425 μηι, to form a porous layer to trap protozoan cysts and fine particulate matter with a mean size in the range of about 1 to 10 μm .
8. A water purification system (100) for purification of water, the water purification system (100) comprising:
a prirnary purification unit (108) comprising a plurality of permeable membranes (114), to filter particulate matter present in the water to provide filtered water; and
a secondary purification unit (110) comprising a plurality of disinfectant treated purification media (118) configured to inactivate microbial contaminants present in the filtered water, wherein each of the plurality of disinfectant treated porous media (118) comprises:
rice husk ash (RHA) having a size selected from the range of about 10 μιη to 600 μm., and
clay having a size selected from the range of about 10 μm. to 800 μm., wherein at least one of the clay and the RHA includes in-situ generated nano particles of a metal disinfectant.
9. The water purification system (100) as claimed in claim 8, wherein the primary purification unit (108) encloses the secondary purification unit (110).
10. The water purification system (100) as claimed in claim 8, wherein the plurality of permeable membranes (114) are made of at least one of a fabric, mesh, foam, cotton canvas, felt, nylon, polypropylene, polyamide, polyester, woven cloth, nonwoven cloth, sand, fired clay, ceramics, glass wool, rice husk ash, and activated charcoal.
11. The water purification system (100) as claimed in claim 8, wherein the plurality of disinfectant treated purification media (118) are cascaded in decreasing order of porosity, wherein the porosity decreases in the direction of flow of water.
12. The water purification system (100) as claimed in claim 8 further comprising a channel (406) for providing purified water purified by the secondary purification unit (110), wherein the channel (406) and the secondary purification unit (110) are connected to form a siphon.
13. The water purification system (100) as claimed in claim 8 further comprising an outlet (106) for providing purified water, and wherein the outlet (106) comprises a carbonaceous adsorbent material selected from at least one of an activated charcoal and RHA to facilitate removal of color and odor from the purified water.
14. The water purification system (100) as claimed in claim 8, wherein the water purification system (100) is made from a material selected from the group consisting of plastics, metals, ceramics, and combinations thereof.
15. A method comprising:
treating at least one of RHA and clay to obtain at least one of disinfectant treated RHA and disinfectant treated clay, respectively;
mixing, with water, at least one of: the RHA and the disinfectant treated clay, the disinfectant treated RHA and the clay, and the disinfectant treated clay and the disinfectant treated RHA, to get a wet mixture; and
heating the wet mixture to obtain a disinfectant treated porous media (1 18).
16. The method as claimed in claim 15, wherein the treating comprises exposing at least one of the RHA and the clay to the disinfectant using a method comprising at least one of:
passing a disinfectant solution through a bed of at least one of the RHA and the clay; soaking at least one of the RHA and the clay in the disinfectant solution;
spraying the disinfectant solution on at least one of the RHA and the clay;
painting the disinfectant solution on at least one of the RHA and the clay; and synthesizing nano particles of the disinfectant in situ within at least one of the RHA and the clay.
17. The method as claimed in claim 15 or 16, wherein the RHA comprises pre- treated RHA obtained by a method comprising:
soaking the RHA in an aqueous solution of 3-aminopropyltriethoxysilane (APTES) to obtain soaked RHA, wherein concentration of APTES is in a range of about 0.1 % to 30 %; and
heating the soaked RHA the in a temperature range of about 20 °C to 250 °C to obtain pre-treated RHA.
18. The method as claimed in claim 15 or 16, wherein the clay comprises pre-treated clay obtained by a method comprising:
soaking the clay in an aqueous solution of APTES to obtain soaked clay, wherein concentration of APTES is in a range of about 0.1 % to 30 %; and
heating the soaked clay in a temperature range of about 20 °C to 250 °C to obtain pre- treated clay.
19. A method comprising:
mixing clay with RHA and water to get a wet mixture;
heating the wet mixture to obtain a porous media; and
treating the porous media with a disinfectant to obtain a disinfectant treated porous media (118).
20. A method comprising:
mixing clay with RHA and water to get a wet mixture;
heating the wet mixture to obtain a porous media;
soaking the porous media in an aqueous solution of APTES to obtain a soaked porous media, wherein the concentration of APTES is in a range of about 0.1 % to 30 %;
heating the soaked porous media in a temperature range of about 20 °C to 250 °C, to obtain a pre-treated porous media; and
treating the pre-treated porous media to the disinfectant.
21. The method as claimed in claim 19 or claim 20 wherein the treating comprises exposing at least one of the pre-treated porous media and the porous media to the disinfectant using a method comprising one of,
passing a disinfectant solution through at least one of the pre-treated porous media and the porous media;
soaking at least one of the pre-treated porous media and the porous media in the disinfectant solution;
spraying the disinfectant solution on at least one of the pre-treated porous media and the porous media;
painting the disinfectant solution on at least one of the pre-treated porous media and the porous media; and
synthesizing nano particles of the disinfectant in situ within at least one of the pre- treated porous media and the porous media.

STATEMENT UNDER ARTICLE 19

In response to the objections raised in the International Searching Report (ISR), the Applicant has amended original independent claim 1 and original dependent claims 1, 6, 9, and 10. Further, original dependent claim 1 1 has been modified to become an independent claim. Additionally, the applicant has removed claims 5, 7, and 8.

The original independent claim 1 of the present subject matter claims a disinfectant treated porous media comprising at least one porous media treated with a disinfectant. The at least one porous media includes rice husk ash (RHA) and clay. In view of the prior art documents Dl - D5, the original independent claim 1 is amended to claim a disinfectant treated porous media for water purification and having in-situ generated nano particles of a metal disinfectant. The amended independent claim 1 claims rice husk ash (RHA) having a size selected from the range of about 10 micrometer (μιη) to 600 μπι and clay having a size selected from the range of about 10 μιη to 800μm , wherein at least one of the clay and the RHA includes in-situ generated nano particles of a metal disinfectant. This amendment is supported by the description of Figure 1 paragraph [0022] lines 1-4, paragraph [0028) lines 1 -3, and paragraph [0030] lines 1 -2; Figure 1 paragraph [0040] lines 8-10; and Figure 1 paragraph [0034] lines 6-7 and paragraph [0039] lines 4-5.

Additionally, original claims 6, 9, 10, and 1 1 have been amended to narrow the scope to make the original claims 6, 9, 10, and 1 1 in conformance with the amended claim 1 and have been renumbered due to removal of original claims 5, 7, and 8.

Further, the original system claim 1 1 of the present subject matter is amended to make it independent of the claim 1 and has been renumbered. The original claim 1 1 is further amended on the basis of the amendments in the independent claim 1 to claim a system having a plurality of disinfectant treated porous media (1 18) comprises rice husk ash (RHA) having a size selected from the range of about 10 μm to 600 μιη and clay having a size selected from the range of about 10 μm to 800 μπι, wherein at least one of the clay and the RHA includes in-situ generated nano particles of a metal disinfectant.

The Applicant believes that the scope of the amended claims is within the scope of the original claims, and no new subject matter is added in the amended claims. The Applicant also believes that the amended claims overcome the issues of novelty and inventive step raised in the ISR in light of the cited prior art documents D1 - D5.

PCT/IN2011/000579 2010-08-27 2011-08-26 Method for purifying water by contacting water with a porous rice husk ash and clay mixture and apparatus therefor WO2012025943A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN2397MU2010 2010-08-27
IN2397/MUM/2010 2010-08-27

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WO2012025943A4 true WO2012025943A4 (en) 2012-03-29

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CN108793306A (en) * 2018-06-29 2018-11-13 河南兰贵坊水族用品科技有限公司 A kind of quick-acting biologic water cleaners and preparation method thereof for fish raising
CN110150316A (en) * 2019-06-02 2019-08-23 上海纳米技术及应用国家工程研究中心有限公司 A kind of preparation method of nano silver/subchloride composite bactericidal liquid

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BR112019010464B1 (en) 2016-12-15 2024-02-06 Ecolab Usa Inc METHOD FOR REMOVING MICRO-ORGANISMS AND MINERAL DEPOSITS IN A MEMBRANE SYSTEM
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CN107381684A (en) * 2017-09-18 2017-11-24 清远绿由环保科技有限公司 A kind of filtering agent and its manufacture method produced with paper mill sludge for handling sewage
CN108793306A (en) * 2018-06-29 2018-11-13 河南兰贵坊水族用品科技有限公司 A kind of quick-acting biologic water cleaners and preparation method thereof for fish raising
CN110150316A (en) * 2019-06-02 2019-08-23 上海纳米技术及应用国家工程研究中心有限公司 A kind of preparation method of nano silver/subchloride composite bactericidal liquid

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