CN102284292A - Ceria load-type high-efficient cold catalyst for purifying formaldehyde in air - Google Patents
Ceria load-type high-efficient cold catalyst for purifying formaldehyde in air Download PDFInfo
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- CN102284292A CN102284292A CN2010102029684A CN201010202968A CN102284292A CN 102284292 A CN102284292 A CN 102284292A CN 2010102029684 A CN2010102029684 A CN 2010102029684A CN 201010202968 A CN201010202968 A CN 201010202968A CN 102284292 A CN102284292 A CN 102284292A
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Abstract
The invention relates to a ceria load-type nanometer cold catalyst which is used for thoroughly removing formaldehyde of air inside a car at a room temperature and has high-efficient sterilization performance, which relates to the field of catalysis, microorganism and environment protection. The titanium dioxide load-type nanometer cold catalyst is characterized in that: honeycomb ceramic is adopted as a carrier, previous lattice silver-doped CaF2 crystal structural ceria (CeO2) is adopted as a basic body, and back-loading silver-golden body system (Ag-Au) is adopted as an active constituent. The weight ratio of the Ag-Au system and the doped CeO2 is 0 to 10 percent, and the weight ratio of the Ag in the Ag-Au system is 0 to 100 percent. The ceria nanometer cold catalyst can high efficiently, stably and thoroughly eliminate the formaldehyde in the air in a real environment of normal temperature and normal humidify, also has long validity, high efficiency and stable wide antibacterial function, has no side effect on the human body, and can be widely used for preparing different air purifiers and different microorganism processing devices to eliminate formaldehyde and to kill the bacteria.
Description
Technical field
The present invention can thoroughly remove the cold catalyst of airborne formaldehyde cerium dioxide nano in the car for a kind of room temperature that is used for, and relates to catalysis, microorganism and field of environment protection.The cold catalyst of cerium dioxide nano of the present invention can be removed airborne formaldehyde by efficient stable up hill and dale in the true environment of ambient temperature and moisture, have long-acting, efficient and stable wide spectrum ability simultaneously, and human body is not had any adverse side effect
The invention still further relates to the cold catalyst preparation method of above-mentioned nanometer.
The invention still further relates to that the cold catalyst of above-mentioned nanometer is applied to prepare various air purifiers and microbial treatment device is removed formaldehyde and killing pathogenic bacteria simultaneously, be particularly useful for automobile-used air purifier.
Background technology
Formaldehyde is a kind of main indoor air pollutants, and its harm has been subjected to people and has paid close attention to widely.China stipulates that the sanitary standard (maximum permissible concentration) of formaldehyde in indoor air is respectively 0.10mg/m in " the IAQ standard " of promulgation in 2002 in (GB/T18883-2002)
3Therefore, the formaldehyde of removing in the room air has important meaning.
Purification method can be divided into absorption method, chemical reaction method, plasma technique, photocatalytic method and catalysis method roughly, and wherein catalysis method is a kind of long-acting method.U.S. Pat 5585083 has been invented a kind of Au/CeO
2Catalyst is removed the method for formaldehyde in the air, and catalyst is that oxidant is completely oxidized to carbon dioxide and water with formaldehyde not having under extra energy input and-5～25 ℃ of conditions with airborne oxygen.But the Au content (12wt%) that catalyst is high causes costing an arm and a leg of catalyst.The Chinese patent CN1698932 rare earth oxide or the metal composite oxide catalyst of load gold, PARA FORMALDEHYDE PRILLS(91,95) can obtain effect preferably under 80～100 ℃ of temperature.
The purpose of this invention is to provide a kind of have the efficient room temperature removal cold catalyst of formaldehyde nanometer and preparation method and application simultaneously.
Summary of the invention
Purpose 1 of the present invention: provide a kind of while efficient room temperature to remove the cold catalyst of formaldehyde high-efficiency CeO 2 supporting type.
Purpose 2 of the present invention: the preparation preparation method of the cold catalyst of efficient room temperature removal formaldehyde nanometer simultaneously is provided.
Purpose 3 of the present invention: relate to the cold catalyst of above-mentioned nanometer and be applied to prepare various environmental protection, air pollutants improvement, medical treatment and health defence and products such as coating, plastics, rubber and fabric.
The objective of the invention is to be achieved through the following technical solutions:
Efficient room temperature provided by the invention is removed the cold catalyst of formaldehyde nanometer, adopts following method synthetic:
1. skeleton doping CaF
2Type CeO
2Two kinds of preparation methods
(1) roasting method key step: with powder CeO
2Perhaps solubility cerium salt, M salt (M=Zn
2+Or Mg
2+), template agent and organic solvent be according to a certain amount of mixing, vigorous stirring mixes, at 100～150 ℃ of drying 1～24h, then at 800～1300 ℃ of roasting 1～36h, cooling back washing, dry and obtain skeleton doping CaF2 type CeO at 200～500 ℃ of roasting 1～36h
2Matrix.
(2) ion-exchange key step: with the skeleton doping CaF of above-mentioned preparation
2Type CeO
2Matrix adds a certain amount of red fuming nitric acid (RFNA) ammonium (NH
4NO
3) forming suspension in the aqueous solution, ion-exchange 1～48h filters, and at 100～150 ℃ of drying 1～24h, then at 200～400 ℃ of roasting 1～36h, as required, ion exchange procedure can repeat, and obtains Partial K in the lattice
+By H
+The skeleton doping CaF2 type CeO that replaces
2Matrix.
2. lattice Ag doping CaF2 type CeO
2The preparation method of matrix.
(1) CaF that skeleton is mixed
2Type CeO
2Matrix adds in a certain amount of aqueous solution and forms suspension.
(2) (≤25wt.%) ammoniacal liquor adds liquor argenti nitratis ophthalmicus (AgNO with finite concentration
3) the middle silver-colored ammonia (Ag (NH that forms
3)
2 +) solution.
(3) under the stirring of fierceness, with finite concentration (≤30wt.%) hydrogen peroxide (H
2O
2) and Ag (NH
3)
2 +Solution is added dropwise to above-mentioned skeleton doping CaF2 type CeO simultaneously respectively
2Matrix suspension, aging 1～12h filters then, washs, and at 100～150 ℃ of drying 1～24h, then at 200～800 ℃ of roasting 1～36h, obtains lattice and contains monatomic silver-colored doping CaF2 type CeO
2Matrix.
3. honeycomb ceramic carrier loaded Ag
x(A)
y[M
zCe
8-z] O
16The preparation method
(1) takes by weighing the Ag of a certain amount of doping
x(A)
y[M
zCe
8-z] O
16Matrix adds a certain proportion of deionized water and adhesive.According to the requirement of viscosity and particle diameter, with the Ag of adhesive and doping
x(A)
y[M
zCe
8-z] O
16Matrix mixing suspended emulsion high-speed stirred 1～24h obtains the Ag of certain density doping
x(A)
y[M
zCe
8-z] O
16The matrix slurries.
(2) adopt the Ag of vacuum-negative pressure extraction technique with above-mentioned doping
x(A)
y[M
zCe
8-z] O
16The matrix slurries are coated on the ceramic honey comb of anticipating, and at 200～800 ℃ of roasting 1～36h, obtain carried with doped Ag
x(A)
y[M
zCe
8-z] O
16The cold catalyst of matrix.
4. doping Ag
x(A)
y[M
zCe
8-z] O
16The method of matrix loaded Ag-Au system is characterized in that adopting the preparation of gas phase reduction process or liquid phase reduction:
(1) gas phase reduction process: with above-mentioned loaded Ag
x(A)
y[M
zCe
8-z] O
16The cold catalyst of monolithic devices (claim 6 preparation) is immersed in AgNO
3With nitroso diamines alloy (Au (NH
3)
2(NO
2)
2) or gold chloride (HAuCl
4) in the mixed solution, dry back is at 200～400 ℃ of roasting 1～36h, then at H
2At 200～400 ℃ of reduction 1～36h, or adopt the UV irradiation 1～72h of certain wavelength and light intensity in the atmosphere.
(2) liquid phase reduction: with loaded Ag
x(A)
y[M
zCe
8-z] O
16The cold catalyst of monolithic devices is immersed in finite concentration AgNO
3And Au (NH
3)
2(NO
2)
2Or in the HAuCl4 mixed solution, add reducing agent then, as NaBH
4, formaldehyde, ethylene glycol, glucose or have the organic matter of reducing property, react 1～6h at a certain temperature, dry back is at 200～400 ℃ of roasting 1～36h.
The technology of the present invention effect
Technique effect of the present invention is that a kind of room temperature can thoroughly be removed airborne formaldehyde and have the feature of the cold catalyst of monolithic devices nanometer of efficient performance simultaneously: in the presence of unglazed under the often wet condition of room temperature with oxidation air in concentration be 0.010～50mg/m
3Formaldehyde change into nontoxic carbon dioxide and water.
Advantage of the present invention
1. high efficiency and broad spectrum activity
Efficient room temperature of the present invention is removed the cold catalyst of formaldehyde nanometer, adopts the method for catalysis, make cold catalyst not only PARA FORMALDEHYDE PRILLS(91,95) outstanding removal ability is arranged but also extremely strong performance is arranged.
2. high stability and long-lasting
Cold catalyst of the present invention has been abandoned adsorption technology, adopts catalytic activation oxygen mechanism, formaldehyde remove and the time catalyst do not consume, have well long-lasting, very high stability and good economy, and human body do not had any adverse side effect.
3. avirulence and having no side effect
Efficient room temperature of the present invention is removed the cold catalyst of formaldehyde nanometer, and when being applied to air cleaning or product, avirulence does not have accessory substance carbon monoxide and formic acid and produces rat half lethal dose LD
50＞2000mg/kg.
The specific embodiment
Embodiment one
The CaF of lattice argentiferous
2Type CeO
2Matrix (Ag
x(A)
y[M
zCe
8-z] O
16, A=K
+, M=Zn
2+Perhaps Mg
2+) preparation.
With powder CeO
2(P25), M salt (Zn (NO
3)
2Perhaps Mg (NO
3)
2), template agent potassium nitrate (KNO
3) and organic matter P123 according to a certain amount of mixing, vigorous stirring mixes, at 100～150 ℃ of drying 1～24h, then at 900 ℃ of roasting 36h, cooling back washing, dry and obtain skeleton doping CaF2 type CeO at 500 ℃ of roasting 24h
2Matrix.
With above-mentioned CaF2 type CeO
2Matrix adds in a certain amount of aqueous solution and forms suspension.(≤25wt.%) ammoniacal liquor adds liquor argenti nitratis ophthalmicus (AgNO with finite concentration
3) the middle silver-colored ammonia (Ag (NH that forms
3)
2 +) solution.Under the stirring of fierceness, with finite concentration (≤30wt.%) hydrogen peroxide (H
2O
2) and silver-colored ammonia (Ag (NH
3)
2 +) solution is added dropwise to above-mentioned CaF2 type CeO respectively simultaneously
2Matrix suspension stirs aging 12h, filters then, washs, and at 110 ℃ of dry 24h, at 500 ℃ of roasting 6h, obtains Ag
x(A)
y[M
zCe
8-z] O
16(x≤2; Y≤2; Z≤3).
XRD and HRTEM analytical proof Ag enter CaF
2Type CeO
2The lattice of matrix.
The performance test of catalyst is carried out on the fixed bed reactors of continuous-flow.Before the catalyst performance test, catalyst is not done any processing, fine catalyst is pulverized the granular of making 0.25～0.50mm through compressing tablet, the 0.5g granular is loaded in the glass tube then, be under 50% the condition in room temperature (20 ℃) and relative humidity, feed and contain 5.0mg/m
3The air of formaldehyde, wind speed are 1.5m/s.Reactor outlet gas detects simultaneously with FCER infrared spectrum analyser, trace gas analysis mass spectrograph and Aglient 7890A gas chromatographicanalyzer simultaneously.The results are shown in Table 1.
Performance test is according to the JIS Z 2801:2000 of Japanese Industrial Standards, and AnCemicrobial products-Testfor anCemicrobial acCevity and efficacy and State Standard of the People's Republic of China GB/T21510-2008 " the cold catalyst performance method of testing of nano inorganic " carry out.Test result is as shown in table 1.
Embodiment two
Ag (K)
0.3[Zn
2Ce
6] O
16The preparation of the cold catalyst of monolithic devices catalysis.Take by weighing a certain amount of Ag (K)
0.3[Zn
2Ce
6] O
16, adding a certain proportion of deionized water and 30% silica adhesive, high-speed stirred 10h obtains the Ag (K) of certain density doping
0.3[Zn
2Ce
6] O
16Slurries.Adopt the vacuum-negative pressure extraction technique with the Ag (K) that mixes
0.3[Zn
2Ce
6] O
16Slurries are coated on the ceramic honey comb of anticipating, and at 500 ℃ of roasting 12h, Ag (K) obtains mixing
0.3[Zn
2Ce
6] O
16The cold catalyst of monolithic devices catalysis.Be designated as " monolithic devices Ag (K)
0.3[Zn
2Ce
6] O
16".
The formaldehyde performance test of the cold catalyst of monolithic devices catalysis is carried out on fixed bed.The three-dimensional of integral catalyst is 150*150*40mm
3, in the glass tube of packing into then, be under 50% the condition in room temperature (20 ℃) and relative humidity, feed and contain 5.0mg/m
3The air of formaldehyde, wind speed are 1.5m/s.Air purifier detects the concentration of exit gas simultaneously simultaneously with FCER infrared spectrum analyser, trace gas analysis mass spectrograph and Aglient 7890A gas chromatographicanalyzer.The results are shown in Table 1.
Performance test is according to the JIS Z 2801:2000 of Japanese Industrial Standards, and AnCemicrobial products-Testfor anCemicrobial acCevity and efficacy and State Standard of the People's Republic of China GB/T21510-2008 " the cold catalyst performance method of testing of nano inorganic " carry out.Test result is as shown in table 1.
Embodiment three
Doping Ag (K)
0.3[Zn
2Ce
6] O
16Matrix loaded Ag-Au system is prepared by gas phase reduction process: with above-mentioned loaded Ag (K)
0.3[Zn
2Ce
6] O
16The cold catalyst of monolithic devices (claim 6 preparation) is immersed in AgNO
3And gold chloride (HAuCl
4) in the mixed solution, dry back is at 300 ℃ of roasting 4h, then at H
2At 300 ℃ of reduction 4h, or adopt the UV irradiation 36h of certain 254nm in the atmosphere.Prepare by liquid phase reduction: with loaded Ag (K)
0.3[Zn
2Ce
6] O
16The cold catalyst of monolithic devices is immersed in finite concentration AgNO
3And Au (NH
3)
2(NO
2)
2Or in the HAuCl4 mixed solution, add reducing agent NaBH then
4, at room temperature reacting 4h, " Ag-Au/Ag (K) is being remembered at 300 ℃ of roasting 4h in dry back
0.3[Zn
2Ce
6] O
16".The content of metal is through icp analysis, wherein Ag-Au and doping Ag (K)
0.3[Zn
2Ce
6] O
16The matrix ratio is 0～10%, and the content of gold accounts for 0～100% of Ag-Au weight ratio.
The formaldehyde performance test of the cold catalyst of monolithic devices catalysis and experiment are with embodiment two.The result shows that the preparation method is little to the experimental result influence, sees Table 2.
Embodiment four
Ag-Au/Ag (K)
0.3[Zn
2Ce
6] O
16The preparation of the cold catalyst of catalysis (Au/Ag=3/7) is identical with embodiment three.
The performance test of catalyst stability experiment is with embodiment two, and follow-on test time 120d, the formaldehyde of inlet are 50mg/m
3, the formaldehyde exit concentration is respectively 0.003mg/m
3Stability (life-span) test is according to the JIS Z 2801:2000 of Japanese Industrial Standards, and AnCemicrobial products-Test foranCemicrobial acCevity and efficacy and State Standard of the People's Republic of China GB/T 21510-2008 " the cold catalyst performance method of testing of nano inorganic " carry out.Active logarithm value: to Escherichia coli is 4.8, is 4.1 to Staphylococcus auresu.
Table 1. lattice contains the CaF of Ag
2Type CeO
2Matrix (Ag
x(A)
y[M
zCe
8-z] O
16) test result.
CatalyCec?nanomaterials HCHO?conversion (％)
Ag(K)
0.6[ZnCe
7]O
16 18.6
Ag(K)
0.3[Zn
2Ce
6]O
16 16.2
Ag(K)
0.3[Zn
3Ce
5]O
16 15.1
Ag(K)
0.6[MgCe
7]O
16 13.2
Ag(K)
0.3[Mg
2Ce
6]O
16 12.0
Ag(K)
0.3[Mg
3Ce
5]O
16 12.5
Ag
0.5(K)
0.3[Zn
2Ce
6]O
16 10.4
Ag
1.5(K)
0.3[Zn
2Ce
6]O
16 19.2
Ag
2(K)
0.3[Zn
2Ce
6]O
16 18.7
Monolithic devices 18.5
Ag(K)
0.3[Zn
2Ce
6]O
16
Table 2.Ag-Au/Ag (K)
0.3[Zn
2Ce
6] O
16Test result.
Au/Ag HCHO?conversion(％)
10∶0 96.1
9∶1 98.7
7∶3 98.9
5∶5 100
3∶7 100
1∶9 85.6
0∶10 50.3
Claims (10)
1. the present invention can thoroughly remove airborne formaldehyde and the cold catalyst of two cerium dioxide nanos with high-efficiency antimicrobial performance for a kind of room temperature that is used for, it is characterized in that adopting ceramic honey comb is carrier, the CaF2 type crystal structure two ceria (CeO of first load impurity silver
2), back loading Yin-Jin system (Ag-Au).Doping CaF2 type CeO
2Matrix is characterised in that chemical general formula can be expressed as Ag
x(A)
y[M
zCe
8-z] O
16(M=Zn
2+, Mg
2+A=K
+, H
+X≤2; Y≤2; Z≤3), [M
zCe
8-z] O
16Expression CaF
2Type CeO
2Skeleton form Ag
x(A)
yExpression CeO
2Lattice form.Ag-Au system and doping CaF
2Type CeO
2The matrix weight ratio is 0～10%, and wherein to account for the weight ratio of Ag-Au system be 0～100% to Ag.
2. a kind of efficient room temperature in the claim 1 is removed formaldehyde and the antibiotic cold catalyst of monolithic devices nanometer of broad-spectrum long-acting, it is characterized in that it is prepared as follows:
(1) skeleton doping CaF2 type CeO
2The matrix preparation.
(2) with above-mentioned skeleton doping CaF2 type CeO
2Matrix carries out lattice Ag doping Ag
x(A)
y[M
zCe
8-z] O
16
(3) with above-mentioned (2) preparation Ag
x(A)
y[M
zCe
8-z] O
16Be coated on the honeycomb ceramic carrier 80～150 ℃ of oven dry, 200～800 ℃ of roasting 1～36h.
(4) with above-mentioned (3) preparation doping CaF
2Type CeO
2Outer surface loaded Ag-Au the cluster or the nano particle of matrix.
3. doping CaF in the claim 2 (1)
2Type CeO
2The preparation method of matrix is characterized in that adopting roasting-ion-exchange synthetic:
(1) roasting method key step: with powder CeO
2Perhaps solubility cerium salt, M salt (M=Zn
2+Or Mg
2+), template agent and organic solvent be according to a certain amount of mixing, vigorous stirring mixes, at 100～150 ℃ of drying 1～24h, then at 800～1300 ℃ of roasting 1～36h, the washing of cooling back, dry and obtain skeleton doping CaF at 200～500 ℃ of roasting 1～36h
2Type CeO
2Matrix.
(2) ion-exchange key step: with the skeleton doping CaF2 type CeO of above-mentioned preparation
2Matrix adds a certain amount of red fuming nitric acid (RFNA) ammonium (NH
4NO
3) forming suspension in the aqueous solution, ion-exchange 1～48h filters, at 100～150 ℃ of drying 1～24h, then at 200～400 ℃ of roasting 1～36h, as required, ion exchange procedure can repeat, and obtains the skeleton doping CaF2 type CeO of Partial K in the lattice+replaced by H+
2Matrix.
4. the skeleton CaF2 type CeO of claim 3
2The preparation method of matrix is characterized in that the condition for preparing is as follows:
(1) powder CeO
2CeO for tetragonal
2Powder; Solubility cerium salt is four cerium chloride (CeCl
4), cerous chloride (CeCl
3), ceric fluoride (CeF
4), ethanol cerium (Ce (OCH
2CH
3)
4), cerium acid four butyl esters (Ce (OCH
2CH
2CH
2CH
3)
4) in waiting one or more.
(2) concentration of M salt is 0.1～5.0mol/L, and its feature is as follows: soluble zinc salt is zinc nitrate (Zn (NO
3)
2), zinc chloride (ZnCl
2) and zinc acetate (Zn (CH
3COO)
2) in waiting one or more; The solubility magnesium salts is magnesium nitrate (Mg (NO
3)
2), magnesium chloride (MgCl
2) and magnesium acetate (Mg (CH
3COO)
2) in waiting one or more.Wherein the mol ratio of M salt and cerium ion is between 0～0.4.
(3) the template agent is one or more in sylvite or the barium salt etc., and wherein sylvite is best, and the mol ratio of template agent and total metal ion is between 1: 1 to 20: 1.
5. the lattice Ag doping CaF in the claim 2 (2)
2Type CeO
2The preparation method of matrix, its feature is as follows:
The CaF of the skeleton doping that (1) claim 3 is prepared
2Type CeO
2Matrix adds in a certain amount of aqueous solution and forms suspension.
(2) (≤25wt.%) ammoniacal liquor adds liquor argenti nitratis ophthalmicus (AgNO with finite concentration
3) the middle silver-colored ammonia (Ag (NH that forms
3)
2 +) solution.
(3) under the stirring of fierceness, with finite concentration (≤30wt.%) hydrogen peroxide (H
2O
2) and Ag (NH
3)
2 +Solution is added dropwise to above-mentioned skeleton doping CaF2 type CeO simultaneously respectively
2Matrix suspension, aging 1～12h filters then, washs, and at 100～150 ℃ of drying 1～24h, then at 200～800 ℃ of roasting 1～36h, obtains lattice and contains monatomic silver-colored doping CaF2 type CeO
2Matrix.
6. the honeycomb ceramic carrier loaded Ag in the claim 2 (3)
x(A)
y[M
zCe
8-z] O
16The preparation method, it is characterized in that:
(1) takes by weighing the Ag of a certain amount of doping
x(A)
y[M
zCe
8-z] O
16Matrix (claim 2 (2) preparation) adds a certain proportion of deionized water and adhesive.According to the requirement of viscosity and particle diameter, with the Ag of adhesive and doping
x(A)
y[M
zCe
8-z] O
16Matrix mixing suspended emulsion high-speed stirred 1～24h obtains the Ag that finite concentration mixes
x(A)
y[M
zCe
8-z] O
16The matrix slurries.
(2) adopt the Ag of vacuum-negative pressure extraction technique with above-mentioned doping
x(A)
y[M
zCe
8-z] O
16The matrix slurries are coated on the ceramic honey comb of anticipating, and at 200～800 ℃ of roasting 1～36h, obtain carried with doped Ag
x(A)
y[M
zCe
8-z] O
16Cold catalyst.
7. the doping CaF2 type CeO in the claim 2 (4)
2The Ag-Au carrying method of matrix is characterized in that adopting the preparation of gas phase reduction process or liquid phase reduction:
(1) gas phase reduction process: with above-mentioned loaded Ag
x(A)
y[M
zCe
8-z] O
16The cold catalyst of monolithic devices (claim 6 preparation) is immersed in AgNO
3And gold chloride (HAuCl
4) in the mixed solution, dry back is at 200～400 ℃ of roasting 1～36h, then at H
2At 200～400 ℃ of reduction 1～36h, or adopt the UV irradiation 1～72h of certain wavelength and light intensity in the atmosphere.
(2) liquid phase reduction: with loaded Ag
x(A)
y[M
zCe
8-z] O
16The cold catalyst of monolithic devices is immersed in finite concentration AgNO
3And HAuCl
4In the mixed solution, add reducing agent then, as NaBH
4, formaldehyde, ethylene glycol, glucose or have the organic matter of reducing property, react 1～6h at a certain temperature, dry back is at 200～400 ℃ of roasting 1～36h.
8. the adhesive described in the claim 6 is inorganic bonds such as silicate, aluminium oxide or zirconium carbonate ammonium, adhesive and doping CaF
2Type CeO
2The weight ratio of matrix is between 1～50%.System of Ag-Au described in the claim 7 and doping CaF
2Type CeO
2The matrix weight ratio is 0～10%, and wherein to account for the weight ratio of Ag-Au system be 0～100% to Ag
9. the antibiotic cold catalyst of long-acting air purifying formaldehyde in the claim 1, its feature CaF2 lattice contains monatomic nano silver wire, mainly is Ag
0, the Ag of monatomic silver and doping
x(A)
y[M
zCe
8-z] O
16Matrix interacts and makes Ag have Partial charge Ag
δ+/ δ-The Ag that mixes
x(A)
y[M
zCe
8-z] O
16The Ag-Au cluster of outer surface of matrix or nano particle mainly are the Ag-Au alloys, the Ag of Ag-Au alloy and doping
x(A)
y[M
zCe
8-z] O
16The matrix interaction can make Ag-Au have Partial charge Ag
δ+, Au
δ+Perhaps Ag
+/2+, Au
2+/4+Exist.
10. a kind of room temperature described in the claim 1 can thoroughly be removed airborne formaldehyde and have the feature of the cold catalyst of monolithic devices nanometer of high-efficiency antimicrobial performance simultaneously: in the presence of unglazed under the often wet condition of room temperature with oxidation air in concentration be 0.010～50mg/m
3Formaldehyde change into nontoxic carbon dioxide and water; The main sterilization mechanism that adopts catalytic activation oxygen formula has the characteristics of efficient height and good stability, can suppress and kill various germs, and as Grain-positive and gram-negative bacteria etc., bacteriostasis (MIC) is in 1～600 μ g/mL scope.
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| CN108069838A (en) * | 2016-11-14 | 2018-05-25 | 中国科学院大连化学物理研究所 | A kind of method that photochemical catalytic oxidation ethylene glycol prepares formaldehyde |
| CN110367280A (en) * | 2019-08-09 | 2019-10-25 | 大连民族大学 | A kind of Ag/CeO2Antibacterial agent and preparation method thereof |
| CN111280176A (en) * | 2019-08-28 | 2020-06-16 | 大连民族大学 | Au/CeO2Bactericide and preparation method and application thereof |
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| CN106913905A (en) * | 2015-12-24 | 2017-07-04 | 中国科学院上海硅酸盐研究所 | A kind of anti-degraded and the good ceria doping calcium silicates coating of anti-microbial property and its preparation method and application |
| CN106913905B (en) * | 2015-12-24 | 2020-02-14 | 中国科学院上海硅酸盐研究所 | Cerium dioxide doped calcium silicate coating with good degradation resistance and antibacterial performance and preparation method and application thereof |
| CN108069838A (en) * | 2016-11-14 | 2018-05-25 | 中国科学院大连化学物理研究所 | A kind of method that photochemical catalytic oxidation ethylene glycol prepares formaldehyde |
| CN108069838B (en) * | 2016-11-14 | 2021-05-25 | 中国科学院大连化学物理研究所 | Method for preparing formaldehyde by photocatalytic oxidation of ethylene glycol |
| CN106865594A (en) * | 2017-02-21 | 2017-06-20 | 开封大学 | A kind of preparation method and applications of water phase fluorination cerium particulate |
| CN110367280A (en) * | 2019-08-09 | 2019-10-25 | 大连民族大学 | A kind of Ag/CeO2Antibacterial agent and preparation method thereof |
| CN111280176A (en) * | 2019-08-28 | 2020-06-16 | 大连民族大学 | Au/CeO2Bactericide and preparation method and application thereof |
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