WO2021152569A1 - Procédé de désinfection de l'eau utilisant du ca2fe2o5 en l'absence de lumière - Google Patents
Procédé de désinfection de l'eau utilisant du ca2fe2o5 en l'absence de lumière Download PDFInfo
- Publication number
- WO2021152569A1 WO2021152569A1 PCT/IB2021/052390 IB2021052390W WO2021152569A1 WO 2021152569 A1 WO2021152569 A1 WO 2021152569A1 IB 2021052390 W IB2021052390 W IB 2021052390W WO 2021152569 A1 WO2021152569 A1 WO 2021152569A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- water
- ca2fe205
- formulation
- disinfection
- light
- Prior art date
Links
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
- C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
-
- 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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/08—Nanoparticles or nanotubes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
Definitions
- [001] Invention relates to a water treatment technology, especially to the disinfection of water from gram-positive and a gram-negative bacteria using a formulation comprising Ca2Fe205.
- International patent application publication No. W02019/003079 discloses a water remediation technology used for photocatalysis in visible light, for example, water purification reactors. It discloses a narrow n- and p-type semiconductor system with high oxidation-reduction potential and low photoinduced charge carrier recombination, which is provided by Z-scheme charge transfer mechanism. System contains photocatalysts from earth abundant chemical elements. Photocatalyst system Fe203/Ca2Fe205 can be used in visible light photocatalysis: (i) water purification; (ii) disinfection; (iii) air purification; (iv) sterile surfaces; (v) water splitting; (vi) synthesis of chemical compounds from ambient C02.
- Chinese patent application publication No. CN108726626 discloses a method for treating water comprising CaFeCM under visible light conditions.
- the present invention is a method for disinfection of liquid substances in dark, preferably a water from a gram-positive and a gram-negative bacteria using a formulation comprising Ca2Fe205.
- the catalytic material Ca2Fe205 employed in the invention has the following physical characteristics: particle size is less than 100 nm, material purity is 99.9%, density is about lOOgr/litre, specific surface area is 13.55 m2/gr.
- Ca2Fe205 concentration in the formulation is l.Og/L to 5.0g/L, for example Ca2Fe205 in water suspension.
- Ca2Fe205 in water suspension has pH in the range of 8.2 to 8.8, preferably 8.5.
- Ca2Fe205 has a light yellowish colour.
- Brownmillerites are oxygen deficient compounds with general formulation A2B205.
- the B are octahedral and tetrahedral site cations arranged in layers and A is a large cation occupying space between layers.
- Srebrodolskite is member of Brownmillerite subgroup with general formulation Ca2Fe205. It is non-stoichiometric perovskite group material with orthorhombic crystal system. Mineral is named in honor of Boris Ivanovich Srebrodolsky and approved in 1984.
- the invention includes a method for water disinfection.
- the method consists of following steps: a) providing a formulation comprising Ca2Fe205; and b) applying said formulation comprising Ca2Fe205 to a water to disinfect thereof.
- the step b) is performed without presence of light allowing to perform disinfection in enclosed volumes or spaces significantly improving disinfection capabilities. Without presence of any light includes no use of visible light, ultraviolet radiation and infrared light.
- the prior art discloses other catalysts disinfectants that work only in visible light decreasing its application in water systems as most water systems are enclosed and are not designed to be subject to visible light.
- the method further comprises a step of applying an effective amount of the formulation comprising CaFeO, preferably Ca2Fe205, to the water to be disinfected.
- the effective amount of the formulation to the water is in the range of 0.2 to 0.7 weight%.
- the formulation comprising Ca2Fe205 (5 g/L) in water has demonstrated a 7.5 log decrease in cultivable E. coli and 6.5 log decrease in cultivable S. aureus within 30 minutes.
- the test was performed in the dark environment - without a presence of any light, ultraviolet radiation and infrared light.
- the observed antimicrobial activity is due to hydroxyl radical generation as indicated by electron paramagnetic resonance measurements.
- the method further comprising the step of applying the formulation comprising Ca2Fe205 to the water for coagulation of bacteria and other solids. Accordingly, the disinfection of water may be made without additional coagulants.
- the key of the invention is a use of the environmentally friendly catalytic material (inorganic antimicrobial agent), that performs physical disinfection of waterborne pathogens.
- Disinfection technology can be described as an aqueous synthase obtained catalytic material, with high disinfection efficacy on a broad spectrum of pathogens in suspended system.
- Catalytic material has been synthesized from non-toxic earth abundant Ca and Fe elements as Ca(N03)2, Fe(N03)3, NH40H and citric acid.
- the formulation comprising Ca2Fe205 may be prepared in a slurry including a dispersion of the formulation comprising Ca2Fe205 in water with an ultrasonic homogenizer.
- Preparation of a powder of Ca2Fe205 for use in a disinfection of the water from gram negative and gram-positive bacteria may be performed in the following manner: a) obtaining a precursor solution in water containing the same number of moles of calcium nitrate and iron nitrate and twice the number of moles of citric acid as the number of moles of a single nitrate; b) adjusting the pH of the solution by adding NH40H dropwise; c) evaporation the water from the solution under constant stirring at 80 °C; d) the resulting mass after evaporation of water is dried at 80 °C till no mass changes can be observed; e) combustion reaction initiation at 300°C to obtain as-prepared CaiFeiOs powder; f) grinding the as-prepared Ca2Fe205 powder; and g) annealing at 800°C for 20 minutes to obtain monophasic Ca2Fe205.
- Disinfection occurs due to radical generation and mechanical impact on bacteria membrane.
- the radical generation is a result of structural transformations of Ca-Fe oxide in water and formation of ionised point defects that are splitting the water and generating the radicals.
- the structural transformations also lead to the formation of flake like particles with the 2D morphology that are interacting and disrupting the bacteria membrane.
- Fig. 1 illustrates a XRD pattern for compound Ca2Fe205.
- the crystalline phases for as-prepared and annealed nanopowders from sol-gel auto-combustion were studied by XRD.
- the XRD studies reveal a phase pure brownmillerite Ca2Fe205 (ICDD 00-047-1744) formation after annealing at 800 °C.
- Ca2Fe205 effect on disinfection of liquid substances preferably a water from a gram positive and a gram-negative bacteria excluding any light, ultraviolet radiation and infrared light, is illustrated in Fig. 2.
- Disinfection test with Ca2Fe205 catalyst was performed in filtered tap water contaminated with specific species of bacteria. The catalyst suspension was added to the contaminated water so that the catalyst concentration in the final sample was 5 g/1. In control samples, filtered tap water was used instead of the catalyst suspension. Changes in colony-forming unit (CFU) over time for E-coli and S-aureus bacteria are shown in Fig. 2. Immediately after adding the catalyst suspension to the contaminated water, a sample was taken.
- CFU colony-forming unit
- Fig. 3 illustrates a degradation of S. aureus bacteria during the time at different powder or catalyst concentrations.
- Pre-filtered tap water (0.2 pm pore size filters, pH range of > 6.5 and ⁇ 9.5) complying to EU Directive 2020/2184 on the quality of water intended for human consumption was used in all microbial activity tests.
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
Abstract
L'invention concerne une technologie de traitement de l'eau, en particulier la désinfection de l'eau contre les bactéries à gram positif et à gram négatif à l'aide d'une formulation comprenant du Ca2Fe2O5. L'invention concerne en outre un procédé de désinfection de l'eau, ce procédé comprenant les étapes consistant : a) à fournir une formulation comprenant du Ca2Fe2O5 ; b) à appliquer ladite formulation à une eau pour désinfecter celle-ci, cette étape étant effectuée sans présence de lumière. L'invention concerne également un matériau catalytique respectueux de l'environnement qui effectue une désinfection physique d'agents pathogènes de l'eau.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
LVLVP2020000046 | 2020-06-19 | ||
LVP-20-46A LV15557A (lv) | 2020-06-19 | 2020-06-19 | Metode ūdens dezinfekcijai, izmantojot CaFeO |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2021152569A1 true WO2021152569A1 (fr) | 2021-08-05 |
Family
ID=74872461
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2021/052390 WO2021152569A1 (fr) | 2020-06-19 | 2021-03-23 | Procédé de désinfection de l'eau utilisant du ca2fe2o5 en l'absence de lumière |
Country Status (2)
Country | Link |
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LV (1) | LV15557A (fr) |
WO (1) | WO2021152569A1 (fr) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB427199A (en) * | 1933-11-27 | 1935-04-17 | Atilio Antonio Manuel Bado | Improvements in the purification of water |
CN108726626A (zh) | 2018-05-31 | 2018-11-02 | 武汉工程大学 | 一种含有可见光响应型CaFe2O4催化剂的水处理剂及水处理方法 |
WO2019003079A1 (fr) | 2017-06-26 | 2019-01-03 | Rīgas Tehniskā Universitāte | Système photocatalytique à base de fe 2o3/ca2fe2o 5 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111268784B (zh) * | 2020-03-05 | 2022-12-02 | 浙江工业大学 | 一种多相类芬顿体系处理有机废水的方法 |
-
2020
- 2020-06-19 LV LVP-20-46A patent/LV15557A/lv unknown
-
2021
- 2021-03-23 WO PCT/IB2021/052390 patent/WO2021152569A1/fr active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB427199A (en) * | 1933-11-27 | 1935-04-17 | Atilio Antonio Manuel Bado | Improvements in the purification of water |
WO2019003079A1 (fr) | 2017-06-26 | 2019-01-03 | Rīgas Tehniskā Universitāte | Système photocatalytique à base de fe 2o3/ca2fe2o 5 |
CN108726626A (zh) | 2018-05-31 | 2018-11-02 | 武汉工程大学 | 一种含有可见光响应型CaFe2O4催化剂的水处理剂及水处理方法 |
Non-Patent Citations (4)
Title |
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EL-RAFEI A M ET AL: "Electrospun magnetically separable calcium ferrite nanofibers for photocatalytic water purification", JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, ELSEVIER, AMSTERDAM, NL, vol. 428, 11 December 2016 (2016-12-11), pages 92 - 98, XP029927903, ISSN: 0304-8853, DOI: 10.1016/J.JMMM.2016.12.020 * |
GANGULY PRIYANKA ET AL: "Antimicrobial activity of photocatalysts: Fundamentals, mechanisms, kinetics and recent advances", APPLIED CATALYSIS B. ENVIRONMENTAL, vol. 225, 1 June 2018 (2018-06-01), AMSTERDAM, NL, pages 51 - 75, XP055812761, ISSN: 0926-3373, DOI: 10.1016/j.apcatb.2017.11.018 * |
VANAGS MARTINS ET AL: "Sol-gel auto-combustion synthesis of Ca2Fe2O5 brownmillerite nanopowders and thin films for advanced oxidation photoelectrochemical water treatment in visible light", JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING, vol. 7, no. 4, 1 August 2019 (2019-08-01), NL, pages 103224, XP055813228, ISSN: 2213-3437, DOI: 10.1016/j.jece.2019.103224 * |
WHEELER GARRETT P. ET AL: "Investigation of p-type Ca 2 Fe 2 O 5 as a Photocathode for Use in a Water Splitting Photoelectrochemical Cell", ACS APPLIED ENERGY MATERIALS, vol. 1, no. 9, 24 September 2018 (2018-09-24), pages 4917 - 4923, XP055812765, ISSN: 2574-0962, Retrieved from the Internet <URL:https://pubs.acs.org/doi/pdf/10.1021/acsaem.8b00934> DOI: 10.1021/acsaem.8b00934 * |
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Publication number | Publication date |
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LV15557A (lv) | 2021-03-20 |
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