CN109607717A - A kind of method for disinfection - Google Patents
A kind of method for disinfection Download PDFInfo
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- CN109607717A CN109607717A CN201910001140.3A CN201910001140A CN109607717A CN 109607717 A CN109607717 A CN 109607717A CN 201910001140 A CN201910001140 A CN 201910001140A CN 109607717 A CN109607717 A CN 109607717A
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- composite material
- nano silver
- silver grain
- wooden slice
- grain
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000004659 sterilization and disinfection Methods 0.000 title claims abstract description 21
- 239000002131 composite material Substances 0.000 claims abstract description 75
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 52
- 230000001954 sterilising effect Effects 0.000 claims abstract description 28
- 241000894006 Bacteria Species 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 238000011065 in-situ storage Methods 0.000 claims abstract description 5
- 238000003763 carbonization Methods 0.000 claims abstract description 4
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 238000001354 calcination Methods 0.000 claims description 13
- 239000002023 wood Substances 0.000 claims description 11
- 239000002243 precursor Substances 0.000 claims description 10
- 229910001961 silver nitrate Inorganic materials 0.000 claims description 10
- 239000003651 drinking water Substances 0.000 claims description 8
- 235000020188 drinking water Nutrition 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 239000011261 inert gas Substances 0.000 claims description 4
- 235000013339 cereals Nutrition 0.000 description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 30
- 241000588724 Escherichia coli Species 0.000 description 11
- 239000002245 particle Substances 0.000 description 11
- 229910052709 silver Inorganic materials 0.000 description 11
- 239000004332 silver Substances 0.000 description 11
- 240000007182 Ochroma pyramidale Species 0.000 description 10
- 239000012153 distilled water Substances 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 7
- 230000005684 electric field Effects 0.000 description 7
- 239000002105 nanoparticle Substances 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- 230000001464 adherent effect Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000007654 immersion Methods 0.000 description 6
- 239000012528 membrane Substances 0.000 description 6
- 230000000844 anti-bacterial effect Effects 0.000 description 5
- 230000001580 bacterial effect Effects 0.000 description 5
- 238000009833 condensation Methods 0.000 description 5
- 230000005494 condensation Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000706 filtrate Substances 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 238000010792 warming Methods 0.000 description 5
- 241000193830 Bacillus <bacterium> Species 0.000 description 4
- 241000194032 Enterococcus faecalis Species 0.000 description 4
- 241000607142 Salmonella Species 0.000 description 4
- 241000607768 Shigella Species 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 229940032049 enterococcus faecalis Drugs 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000000249 desinfective effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 239000002082 metal nanoparticle Substances 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 208000005623 Carcinogenesis Diseases 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 241000219000 Populus Species 0.000 description 1
- 239000002253 acid Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- SXDBWCPKPHAZSM-UHFFFAOYSA-M bromate Inorganic materials [O-]Br(=O)=O SXDBWCPKPHAZSM-UHFFFAOYSA-M 0.000 description 1
- SXDBWCPKPHAZSM-UHFFFAOYSA-N bromic acid Chemical class OBr(=O)=O SXDBWCPKPHAZSM-UHFFFAOYSA-N 0.000 description 1
- 210000005252 bulbus oculi Anatomy 0.000 description 1
- RHDGNLCLDBVESU-UHFFFAOYSA-N but-3-en-4-olide Chemical compound O=C1CC=CO1 RHDGNLCLDBVESU-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000036952 cancer formation Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 231100000504 carcinogenesis Toxicity 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- RNFNDJAIBTYOQL-UHFFFAOYSA-N chloral hydrate Chemical compound OC(O)C(Cl)(Cl)Cl RNFNDJAIBTYOQL-UHFFFAOYSA-N 0.000 description 1
- 229960002327 chloral hydrate Drugs 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 125000001309 chloro group Chemical group Cl* 0.000 description 1
- LFHISGNCFUNFFM-UHFFFAOYSA-N chloropicrin Chemical compound [O-][N+](=O)C(Cl)(Cl)Cl LFHISGNCFUNFFM-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- QPJDMGCKMHUXFD-UHFFFAOYSA-N cyanogen chloride Chemical class ClC#N QPJDMGCKMHUXFD-UHFFFAOYSA-N 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000002070 germicidal effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 239000002699 waste material Substances 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
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
-
- 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
Landscapes
- Chemical & Material Sciences (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)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
The present invention provides a kind of method for disinfection comprising: composite material step A1, is provided, the composite material includes Wooden slice and the Nano silver grain by carbonization growth in situ in Wooden slice;Step A2, the composite material is contacted with containing germy liquid, and be powered to the composite material, kill bacterium using composite material.The sterilizing rate sterilized using this method is high, and processing speed is fast, and processing cost is low, embodies the sustainable theory of green.
Description
Technical field
The present invention relates to a kind of method for disinfection.
Background technique
The safety of drinking water and human health are closely bound up.Bacterial content is exceeded in drinking water, is to cause drinking water uneasy
One of the main reason for complete.Drinking water sterilization technology specifically includes that chlorine system medicament disinfecting method, ozone sterilizing and ultraviolet light remove at present
Bacterium etc..Chlorine system medicament disinfecting technology can broad-spectrum sterilization, can quickly kill microorganism in water, germ and protozoan sporangiocyst.
But during chlorination, it is a series of that with chlorine substitution, addition etc. can occur for the pollutants such as natural organic matter contained in water
Chemical reaction generates disinfection by-products (DBPs), comprising: haloform, halogen second eyeball, chloral hydrate, halogen acetic acid, halogenated
Phenol, trichloronitromethane, halogenated ketone, cyanogen chloride, bromate and acid chlorization furanone etc., these DBPs have human toxicity and
Potential carcinogenesis.Ozone sterilizing is to can be realized the effect of quick sterilization by oxidation, but equipment requirement is high, preceding
Phase cost of investment is big, and energy consumption is high, limits the extensive use of the technology.
Nano silver has the characteristics such as efficient, wide spectrum, safety, kills in drinking water as a kind of disinfecting material in recent years
Bacterium field has potential application foreground.Bactericidal nano-silver technology still has some bottleneck problems at present: (1) nano silver synthesizes work
Skill is complicated, higher cost, uses a large amount of reducing agents and surfactant in the synthesis process, brings new pollution;(2) through nanometer
After silver processing, silver-colored residual quantity is higher in water, has potential hazard to human body;(3) nanometer silver recovery is difficult, and can not achieve circulation makes
With causing to waste.Therefore it is extremely urgent that a kind of low cost, high efficiency, safe and reliable sterilization technology are developed.
Summary of the invention
In order to solve the problems in the existing technology, the present invention provides it is a kind of using composite material sterilize method,
The composite material is using Wooden slice as substrate, and by being carbonized in the 3 D pore canal of Wooden slice, growth size in situ is uniform, divides
Dissipate the good Nano silver grain of property.When being sterilized using the composite material, under DC Electric Field, due to " adherent effect "
Bacterium in water comes into full contact with the Nano silver grain in Wooden slice 3 D pore canal, realizes fast and efficiently bactericidal effect.It should
The preparation process of composite material is simple, and germicidal efficiency is high, and water process speed is fast, and silver-colored residual quantity is small (< 1.5ppb) in water after processing,
Nano silver grain loses small, sustainable use in composite material, has wide prospects for commercial application.
According to an aspect of the present invention, a kind of method for disinfection is provided comprising:
Step A1, composite material is provided, the composite material includes Wooden slice and passes through carbonization in Wooden slice
The Nano silver grain of growth in situ;
Step A2, the composite material is contacted with containing germy liquid, and be powered to the composite material, using again
Condensation material kills bacterium.
According to the preferred embodiment of the present invention, the composite material is prepared via a method which:
Step S1, the precursor solution of Wooden slice and Nano silver grain is provided;
Step S2, it is sliced with the precursor solution impregnated timber of Nano silver grain, then Wooden slice is dried, is forged
Burning obtains the composite material.
According to the preferred embodiment of the present invention, the voltage of the energization be 0.1-5.0V, such as can for 0.1V,
0.3V, 0.5V, 0.7V, 1.0V, 2.0V, 3.0V, 5.0V and the arbitrary value between them, preferably 0.5-1.0V.Adding outside
Under the induction of electric field, bacterium generates " adherent effect ", and efficient sterilizing is realized in the Nano silver grain contact sufficiently and in composite material
Effect (Fig. 5).
According to the preferred embodiment of the present invention, the composite material and the way of contact containing germy liquid is make
It states and flows through the composite material containing germy liquid, it is preferable that containing germy liquid with 1000-5000Lm-2·h-1,
It such as can be 1000Lm-2·h-1、1500L·m-2·h-1、2000L·m-2·h-1、3000L·m-2·h-1、4000L·m-2·h-1、5000L·m-2·h-1And the arbitrary value between them, preferably with 1000-3000Lm-2·h-1, more preferably
1500-3000L·m-2·h-1Flow velocity flow through the composite material.
According to the preferred embodiment of the present invention, the content containing bacterium in germy liquid is 106-107CFU·
mL-1, such as can be 106CFU·mL-1、2×106CFU·mL-1、4×106CFU·mL-1、6×106CFU·mL-1、8×
106CFU·mL-1、107CFU·mL-1And the arbitrary value between them.
According to the preferred embodiment of the present invention, the bacterium includes Escherichia coli, enterococcus faecalis, Shigella, sramana
One of Salmonella and hay bacillus are a variety of.
The timber that can be used for the application can be exemplified as cork wood, platane wood and poplar etc..
In the present invention during preparing composite material, to the precursor solution and Wooden slice dosage of Nano silver grain
Relationship is not particularly limited, as long as the precursor solution of Nano silver grain can submerge the Wooden slice, it is preferable that silver
The volume of the precursor solution of nanoparticle is 1-10 times, preferably 2-5 times of Wooden slice volume.
According to the preferred embodiment of the present invention, in step S2, after immersion, by after the surface clean of Wooden slice again
It is dried, it is preferable that drying is carried out by the way of naturally dry.
According to the preferred embodiment of the present invention, calcining carries out under inert gas protection, and inert gas is preferably nitrogen.
According to the preferred embodiment of the present invention, the temperature of calcining is 500-1000 DEG C, for example, 500 DEG C, 600 DEG C, 700
DEG C, 750 DEG C, 800 DEG C, 850 DEG C, 900 DEG C, 1000 DEG C and the arbitrary value between them, preferably 600-800 DEG C.In the calcining
At a temperature of, be conducive to wood formation simple substance carbon, Nano silver grain presoma is restored at high temperature, formation uniform particle diameter,
The Nano silver grain of favorable dispersibility.Also, the good conductivity for the composite material calcined at such a temperature, in extra electric field
Under effect, be conducive to Induction of bacterial and generate " adherent effect ", promote bacterium and Nano silver grain contact, is conducive to improve composite wood
The sterilizing rate of material.
In certain embodiments of the present invention, the temperature of calcining is 700-800 DEG C.
According to the preferred embodiment of the present invention, the time of calcining is 60-180min, preferably 60-120min.
According to the preferred embodiment of the present invention, the average grain diameter of the Nano silver grain is 50nm hereinafter, preferably
30nm or less.
According to the preferred embodiment of the present invention, Nano silver grain presoma in the precursor solution of the Nano silver grain
Concentration be 1.0-10.0g/L, for example, concentration be 1.0g/L, 2.0g/L, 3.0g/L, 5.0g/L, 7.0g/L, 8.0g/L,
10.0g/L and any concentration between them, preferably 3.0-5.0g/L.Present inventor is the study found that nano grain of silver
Within the above range to favorable dispersibility is formed, the Nano silver grain of uniform particle diameter is advantageous the concentration of the presoma of son, from
And can be more efficient sterilization.
According to the preferred embodiment of the present invention, in step s 2, with the precursor solution impregnated timber of Nano silver grain
It is sliced 10-120min, preferably 30-60min.
According to the preferred embodiment of the present invention, the Wooden slice with a thickness of 1-50mm, for example, 1mm, 5mm,
10mm, 20mm, 30mm, 40mm, 45mm, 50mm and the arbitrary value between them, preferably 20-40mm.
In the present invention, the presoma of metal nanoparticle refers to the compound that metal nanoparticle can be generated by calcining
Or composition.
Method for disinfection provided by the invention can be used for drinking water sterilization.
Beneficial effects of the present invention:
Timber exists extensive, low in cost on earth, and with 3 D pore canal microstructure, which can realize moisture
Quick transmission.Composite material used in sterilization processing of the present invention is using natural timber as substrate, using silver nitrate as presoma,
Using the method for carbonization, the in-situ preparation Nano silver grain in timber 3 D pore canal.The microstructure of timber, for nano grain of silver
Son growth have confinement effect, advantageously form be uniformly dispersed, the Nano silver grain of uniform particle diameter, make the preparation work of composite material
Skill is extremely simple.The present invention, can be by metallic nanoparticle without using additional reducing agent during preparing composite material
The presoma of son is reduced to metal nanoparticle, other foreign ions is not introduced into during preparing composite material, after convenient
The stability of continuous processing, obtained composite material is good, industrialized production easy to accomplish, economic use value with higher.
Composite material is under the conditions of extra electric field, during being sterilized, under the action of extra electric field, and Induction of bacterial
Generating " adherent effect " makes bacterium be easier to contact with Nano silver grain in timber 3 D pore canal, to realize efficiently, quickly
Bactericidal effect.Drinking water sterilization is carried out using method provided by the invention, is had to various bacteria in water and microorganism preferable
Bactericidal effect, sterilizing rate may be up to 99.999%, and processing speed is fast, at low cost, embody the sustainable theory of green, in addition
Silver-colored less residue (< 1.5ppb) after sterilization in water, Nano silver grain loss is small, and composite material persistently uses the time long.
Detailed description of the invention
Fig. 1 is the microstructure scanning electron microscopic picture of cork wood used in embodiment.
Fig. 2 is the photo of composite material made from embodiment 1.
In Fig. 3, (a) is the transmission electron microscope picture of composite material made from embodiment 1, is (b) Nano silver grain size point
Butut.
Fig. 4 is the stereoscan photograph using the method for the present invention treated bacterium.
Fig. 5 shows under electric field inducing action, due to " adherent effect ", bacterium preferably with the Yin Na in composite material
Rice corpuscles contact.
Specific embodiment
The present invention is described in detail with reference to embodiments, but the present invention is not limited by following embodiments.
Composite material prepares embodiment
Embodiment 1
The concentration for preparing 20mL is 5gL-1Silver nitrate solution.It is 5cm, with a thickness of 20mm's that cork wood, which is cut into diameter,
Thin slice of wood, with distilled water immersion to remove surface impurity, then naturally dry.Timber is impregnated with the silver nitrate solution to cut
Piece after 60min, takes out Wooden slice, naturally dry.The Wooden slice dried is put in tube furnace, with the rate of 5 DEG C/min
800 DEG C are warming up to, under nitrogen protection 800 DEG C of calcining 180min, it is cooling, prepare composite material.1mg composite material is taken, is passed through
Grinding and ultrasonic treatment, the pattern of Nano silver grain in electric microscopic observation composite material, transmission electron microscope results prove, use the party
Silver nanoparticle dispersion is good in the composite material of method preparation, uniform particle diameter, 25 ± 5nm of average particle size range.Composite material
Nano silver grain load capacity be 11.5wt%.The microstructure scanning electron microscope that Fig. 1 illustrates timber is shone, and Fig. 2 illustrates compound
The photo of material.The particle diameter distribution of composite material transmission electron microscope photo and Nano silver grain is as shown in Figure 3.
Embodiment 2
The concentration for preparing 100mL is 5gL-1Silver nitrate solution.It is 10cm, with a thickness of 20mm that cork wood, which is cut into diameter,
Thin slice of wood, with distilled water immersion to remove surface impurity, then naturally dry.Timber is impregnated with the silver nitrate solution to cut
Piece after 60min, takes out Wooden slice, with naturally dry behind distilled water flushing surface.The Wooden slice dried is put in tube furnace
In, 800 DEG C are warming up to the rate of 5 DEG C/min, under nitrogen protection 800 DEG C of calcining 180min, it is cooling, prepare composite material.
1mg composite material is taken, by grinding and being ultrasonically treated, the pattern of Nano silver grain in electric microscopic observation composite material, transmission
Electronic Speculum is the results show that, uniform particle diameter good with silver nanoparticle dispersion in the composite material of this method preparation, average grain diameter model
It encloses for 25 ± 5nm.Obtain the preferable composite material of stability.The load capacity of Nano silver grain is 11.5wt%.
Embodiment 3
The concentration for preparing 500mL is 5gL-1Silver nitrate solution.It is 40cm, with a thickness of 20mm that cork wood, which is cut into diameter,
Thin slice of wood remove surface impurity, naturally dry with distilled water immersion.Wooden slice is impregnated with the silver nitrate solution,
After 60min, Wooden slice is taken out, with distilled water flushing surface, naturally dry.The Wooden slice dried is put in tube furnace,
800 DEG C are warming up to the rate of 5 DEG C/min, under nitrogen protection 800 DEG C of calcining 180min, it is cooling, prepare composite material.It takes
1mg composite material, by grinding and being ultrasonically treated, the pattern of Nano silver grain in electric microscopic observation composite material, transmission electricity
Mirror is the results show that, uniform particle diameter good with silver nanoparticle dispersion in the composite material of this method preparation, average particle size range
For 25 ± 5nm.Obtain the preferable composite material of stability.The load capacity of Nano silver grain is 11.5wt%.
Embodiment 4
The concentration for preparing 20mL is 5gL-1Silver nitrate solution.By cork wood wood be cut into diameter be 5cm, with a thickness of
The thin slice of wood of 20mm, with distilled water immersion to remove surface impurity, then naturally dry.Wood is impregnated with the silver nitrate solution
Material is sliced, and after 60min, Wooden slice is taken out, with naturally dry behind distilled water flushing surface.The Wooden slice dried is put in pipe
In formula furnace, 1000 DEG C are warming up to the rate of 5 DEG C/min, under nitrogen protection 1000 DEG C of calcining 180min, it is cooling, it prepares compound
Material.1mg composite material is taken, by grinding and being ultrasonically treated, the pattern of Nano silver grain in electric microscopic observation composite material,
Transmission electron microscope results prove, good with silver nanoparticle dispersion in the composite material of this method preparation, uniform particle diameter, average grain
Diameter range is 45 ± 5nm.Obtain the preferable composite material of stability.The load capacity of nano-Ag particles is on composite material
11.5wt%.
Comparative example 1
It is 5cm, with a thickness of the thin slice of wood of 20mm that cork wood, which is cut into diameter, and it is miscellaneous to remove surface with distilled water immersion
Matter, then naturally dry.The Wooden slice dried is put in tube furnace, 800 DEG C are warming up to the rate of 5 DEG C/min, in nitrogen
The lower 800 DEG C of calcinings 180min of gas shielded prepares the balsa wood material of not silver nanoparticle-containing.
Sterilization experiment
Balsa wood material made from composite material obtained and comparative example 1 is placed in as filter membrane using in embodiment 1-4 respectively
In filter, perpendicular to water (flow) direction, composite material or the additional 0.5V voltage of balsa wood material is given, Escherichia coli standard will be contained
(concentration of Escherichia coli is 10 to the water sample of bacterium7CFU·mL-1) with 1500Lm-2·h-1Flow velocity by filter, collect filter
Liquid carries out count plate using spread plate method, calculates the sterilizing rate that material reaches under this flow velocity.It the results are shown in Table 1.Use this
The stereoscan photograph of bacterium is shown in Fig. 4 after inventive method sterilization processing.
Table 1
Number | Sterilizing rate (%) |
Embodiment 1 | 99.9995 |
Embodiment 2 | 99.9992 |
Embodiment 3 | 99.9991 |
Embodiment 4 | 99.9560 |
Comparative example 1 | 40.1000 |
Influence of the voltage to sterilization processing effect
It using composite material made from embodiment 1 as filter membrane, is placed in filter, perpendicular to water (flow) direction, gives multiple
Condensation material applied voltage 0V, 0.1V, 0.3V, 0.5V, 0.7V, 1.0V, 2.0V, 3.0V, 5.0V voltage will contain Escherichia coli mark
(concentration of Escherichia coli is 10 to the water sample of quasi- bacterium7CFU·mL-1) with 1500Lm-2·h-1Flow velocity by filter, collect
Filtrate carries out count plate using spread plate method, calculates the sterilizing rate that material reaches under this flow velocity.It the results are shown in Table 2.Fig. 5
It shows under electric field action, Induction of bacterial generates " adherent effect ".
Table 2
Voltage | Sterilizing rate (%) |
0V | 40.2000 |
0.1V | 67.0673 |
0.3V | 95.6714 |
0.5V | 99.9991 |
0.7V | 99.9992 |
1.0V | 99.9993 |
2.0V | 99.9996 |
3.0V | 99.9994 |
5.0V | 99.9996 |
Influence of the flow velocity of water sample to bactericidal effect
It using composite material made from embodiment 1 as filter membrane, is placed in filter, perpendicular to water (flow) direction, gives multiple
The additional 0.5V voltage of condensation material, by the water sample containing Escherichia coli standard bacteria, (concentration of Escherichia coli is 107CFU·mL-1) point
Not with 1000Lm-2·h-1、1500L·m-2·h-1、2000L·m-2·h-1、3000L·m-2·h-1、4000L·m-2·h-1、
5000L·m-2·h-1Flow velocity by filter, collect filtrate, count plate carried out using spread plate method, calculate material and exist
The sterilizing rate reached under this flow velocity.It the results are shown in Table 3.
Table 3
Sterilizing rate (%) | Flow velocity (Lm-2·h-1) |
99.9994 | 1000 |
99.9993 | 1500 |
99.9994 | 2000 |
99.9992 | 3000 |
99.9812 | 4000 |
99.8774 | 5000 |
Composite material is killing the application in enterococcus faecalis, salmonella, hay bacillus and Shigella
It using composite material made from embodiment 1 as filter membrane, is placed in filter, perpendicular to water (flow) direction, gives multiple
The additional 0.5V voltage of condensation material respectively will be (wherein thin containing enterococcus faecalis, salmonella, hay bacillus and the water sample of Shigella
The concentration of bacterium is respectively 107CFU·mL-1) with 2000Lm-2·h-1Flow velocity by filter, filtrate is collected, using coating
Flat band method carries out count plate, calculates the sterilizing rate that material reaches under this flow velocity.It the results are shown in Table 4.
Table 4
Bacterial species | Sterilizing rate (%) |
Enterococcus faecalis | 99.9992 |
Salmonella | 99.9994 |
Hay bacillus | 99.9995 |
Shigella | 99.9992 |
Stability experiment
It respectively using composite material made from embodiment 1-4 as filter membrane, is placed in filter, perpendicular to water flow side
To the additional 0.5V voltage of composite material, by the water sample containing Escherichia coli standard bacteria, (concentration of Escherichia coli is 107CFU·
mL-1) with 2000Lm-2·h-1Flow velocity by filter, after handling 5h, ICP-MS progress is passed through to the silver content in filtrate
Detection, experiment the results are shown in Table 5.
Table 5
Number | Ag concentration (ppb) in filtrate |
Embodiment 1 | 1.20 |
Embodiment 2 | 1.15 |
Embodiment 3 | 1.13 |
Embodiment 4 | 1.37 |
It using composite material made from embodiment 2 as filter membrane, is placed in filter, perpendicular to water (flow) direction, gives multiple
The additional 0.5V voltage of condensation material, by the water sample containing Escherichia coli standard bacteria, (concentration of Escherichia coli is 107CFU·mL-1) with
2000L·m-2·h-1Flow velocity by filter, after continuous processing 5t water, sterilizing rate is 99.9991% or more.
It should be noted that embodiment described above for explaining only the invention, is not constituted to of the invention any
Limitation.By referring to exemplary embodiments, invention has been described, it should be appreciated that word used in it is descriptive
With explanatory vocabulary, rather than limited vocabulary.The present invention can be made within the scope of the claims by regulation
Modification, and the present invention is revised in without departing substantially from scope and spirit of the present invention.Although the present invention described in it relates to
And specific method, material and embodiment, it is not intended that the present invention is limited to particular case disclosed in it, on the contrary, this hair
It is bright to can be extended to other all methods and applications with the same function.
Claims (10)
1. a kind of method for disinfection comprising:
Step A1, composite material is provided, the composite material includes Wooden slice and in situ in Wooden slice by carbonization
The Nano silver grain of growth;
Step A2, the composite material is contacted with containing germy liquid, and be powered to the composite material, utilize composite wood
Material is to kill bacterium.
2. the method according to claim 1, wherein the composite material is prepared via a method which:
Step S1, the precursor solution of Wooden slice and Nano silver grain is provided;
Step S2, it is sliced with the precursor solution impregnated timber of Nano silver grain, then Wooden slice is dried, is calcined
To the composite material.
3. method according to claim 1 or 2, which is characterized in that the voltage of the energization is 0.1-5.0V, preferably
0.5-1.0V。
4. method according to any one of claim 1-3, which is characterized in that the composite material with contain germy liquid
The way of contact of body is to make described to flow through the composite material containing germy liquid, it is preferable that containing germy liquid with
1000-5000L·m-2·h-1, preferably with 1000-3000Lm-2·h-1Flow velocity flow through the composite material.
5. method according to any of claims 1-4, which is characterized in that described containing bacterium in germy liquid
Content is 106-107CFU·mL-1。
6. method according to any one of claims 1-5, which is characterized in that in step s 2, calcine in inert gas
Protection is lower to be carried out, and inert gas is preferably nitrogen;The temperature of calcining be 500-1000 DEG C, preferably 700-800 DEG C, and/or, calcining
Time be 60-180min, preferably 60-120min.
7. method according to claim 1 to 6, which is characterized in that the precursor solution of the Nano silver grain
The concentration of middle Nano silver grain presoma is 1.0-10.0g/L, preferably 3.0-5.0g/L;Preferably, the Nano silver grain
Presoma is silver nitrate.
8. the method according to any one of claim 2-7, which is characterized in that Nano silver grain in the composite material
Average grain diameter is 50nm hereinafter, preferably 30nm or less.
9. the method according to any one of claim 2-8, which is characterized in that the Wooden slice with a thickness of 1-
50mm, preferably 20-40mm.
10. application of the method according to claim 1 to 9 in drinking water sterilization.
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CN108943245A (en) * | 2018-08-28 | 2018-12-07 | 山东农业大学 | The preparation method of multi-functional carbonized wood |
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