CN102240542A - Visible-light-responsive composite oxide photochemical catalyst Li2SrNb(2-x)TaxO7 and preparation method thereof - Google Patents
Visible-light-responsive composite oxide photochemical catalyst Li2SrNb(2-x)TaxO7 and preparation method thereof Download PDFInfo
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- CN102240542A CN102240542A CN2011100943454A CN201110094345A CN102240542A CN 102240542 A CN102240542 A CN 102240542A CN 2011100943454 A CN2011100943454 A CN 2011100943454A CN 201110094345 A CN201110094345 A CN 201110094345A CN 102240542 A CN102240542 A CN 102240542A
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- 239000002131 composite material Substances 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000003054 catalyst Substances 0.000 title abstract description 26
- 239000000843 powder Substances 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 17
- 239000002245 particle Substances 0.000 claims abstract description 11
- 238000000498 ball milling Methods 0.000 claims abstract description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 239000011941 photocatalyst Substances 0.000 claims description 16
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 14
- 239000013064 chemical raw material Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 230000003292 diminished effect Effects 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 7
- 238000010298 pulverizing process Methods 0.000 claims description 6
- 230000001699 photocatalysis Effects 0.000 claims description 4
- 238000007146 photocatalysis Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000003197 catalytic effect Effects 0.000 abstract description 2
- ZKATWMILCYLAPD-UHFFFAOYSA-N niobium pentoxide Chemical compound O=[Nb](=O)O[Nb](=O)=O ZKATWMILCYLAPD-UHFFFAOYSA-N 0.000 abstract 2
- 238000001816 cooling Methods 0.000 abstract 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 abstract 1
- 229910052808 lithium carbonate Inorganic materials 0.000 abstract 1
- 239000011812 mixed powder Substances 0.000 abstract 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 abstract 1
- 238000007873 sieving Methods 0.000 abstract 1
- LEDMRZGFZIAGGB-UHFFFAOYSA-L strontium carbonate Chemical compound [Sr+2].[O-]C([O-])=O LEDMRZGFZIAGGB-UHFFFAOYSA-L 0.000 abstract 1
- 229910000018 strontium carbonate Inorganic materials 0.000 abstract 1
- PBCFLUZVCVVTBY-UHFFFAOYSA-N tantalum pentoxide Inorganic materials O=[Ta](=O)O[Ta](=O)=O PBCFLUZVCVVTBY-UHFFFAOYSA-N 0.000 abstract 1
- 238000005303 weighing Methods 0.000 abstract 1
- 229910001928 zirconium oxide Inorganic materials 0.000 abstract 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical group O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 7
- STZCRXQWRGQSJD-GEEYTBSJSA-M methyl orange Chemical compound [Na+].C1=CC(N(C)C)=CC=C1\N=N\C1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-GEEYTBSJSA-M 0.000 description 6
- 229940012189 methyl orange Drugs 0.000 description 6
- 230000005855 radiation Effects 0.000 description 6
- 238000006555 catalytic reaction Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 239000004408 titanium dioxide Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000003905 agrochemical Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000003205 fragrance Substances 0.000 description 2
- 238000010532 solid phase synthesis reaction Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000003373 anti-fouling effect Effects 0.000 description 1
- 230000003115 biocidal effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000004332 deodorization Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000005297 pyrex Substances 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Abstract
The invention discloses a visible-light-responsive composite oxide photochemical catalyst Li2SrNb(2-x)TaxO7 and a preparation method thereof. The chemical composition general formula of the composite oxide is Li2SrNb(2-x)TaxO7, wherein x is more than or equal to 0 and is less than or equal to 2. The preparation method comprises the following steps of: weighing and burdening 99.9% analytically pure chemical raw materials, namely Li2CO3, SrCO3, Nb2O5 and Ta2O5 according to the chemical formula Li2SrNb(2-x)TaxO7, wherein x is more than or equal to 0 and is less than or equal to 2; mixing the burdened raw materials and placing the mixed raw materials into a ball milling tank, adding zirconium oxide balls and absolute ethyl alcohol, carrying out ball-milling for 12 hours, mixing and levigating, taking out a mixture and sieving by a 200-mesh sieve; presintering uniformly mixed powder at the temperature of 850-950 DEG C, insulating for 8-10 hours, naturally cooling to room temperature, and then reducing the particle diameter by adopting the smashing means such as a ball milling machine until the particle diameter is less than 2mu m, thus the composite oxide photochemical catalyst Li2SrNb(2-x)TaxO7 powder is obtained. The preparation method disclosed by the invention is simple and has low cost, and the prepared photochemical catalyst has good catalytic property, has the effect of decomposing harmful chemical substances under the irradiation of visible light and has good stability and a good application prospect.
Description
Technical field
The present invention relates to a kind of visible light responded composite oxide photocatalyst Li
2SrNb
2-xTa
xO
7(0≤x≤2) and preparation method thereof belong to inorganic field of photocatalytic material.
Background technology
Along with The development in society and economy, people more and more pay close attention to for the energy and ecological environment, solve energy shortage and problem of environmental pollution and be to realize sustainable development, improve people's living standard and pressing for of safeguarding national security.
From phase late 1970s, people proposed to utilize in the photochemical catalyst decomposition water and atmosphere in agricultural chemicals and organic matter such as odorant, and application examples such as self-cleaning that scribble the surface of solids of photochemical catalyst.The principle of light-catalyzed reaction is that photochemical catalyst is after having absorbed the photon that is higher than its band-gap energy, hole and electronics have been generated, these holes and electronics carry out oxidation reaction and reduction reaction respectively, reach the purpose of decomposing harmful chemical, organic-biological matter and sterilization.Photochemical catalyst has many kinds, and wherein most representative is titanium dioxide (TiO
2), utilized titanium dioxide in the water and the agricultural chemicals in the atmosphere and organic matters such as odorant decompose, yet the band gap of titanium dioxide is 3.2eV, only under than the short ultraviolet irradiation of 400nm, just can show activity, can only be indoor or the local work of uviol lamp arranged, almost can not utilize visible light, this has limited the use of titanium dioxide optical catalyst greatly.
Consider the practicality of photochemical catalyst in decomposing harmful substances, utilizing sunshine is indispensable as light source.Irradiation is near sunshine medium wavelength visible light intensity maximum 500nm on the face of land, wavelength is that the energy of the visible region of 400nm-750nm approximately is 43% of a sunshine gross energy, so in order to utilize solar spectrum efficiently, searching has the attention that visible light-responded photochemical catalyst has caused people.
Catalysis material is having important application prospects aspect the solution energy and the environmental problem.In the last few years, photochemical catalyst has caused countries in the world scientist's concern, many famous research institutions and enterprise drop into the research that huge fund is engaged in photochemical catalyst mechanism and application in succession, and photochemical catalyst has begun to enter the stage of applying in many fields such as antibiotic, deodorization, antifouling and water treatments.Some scientists think that because photochemical catalyst has good depollution of environment effect, along with going deep into of various countries' research work, this new material will become one of most promising brand-new material product of 21 century.
Though photocatalysis research has been carried out the several years, but at present report to have visible light-responded photochemical catalyst kind still very limited, problem such as exist still that light conversion efficiency is low, poor stability and spectrum respective range are narrow is very necessary so research and develop the new visible light-responded high efficiency photocatalyst that has.
Summary of the invention
The purpose of this invention is to provide a kind of have visible light responded composite oxide photocatalyst with and preparation method thereof.
A kind of visible light responded composite oxide photocatalyst that has provided by the invention is characterized in that the chemical composition general formula of described compound oxide photocatalyst is: Li
2SrNb
2-xTa
xO
7, 0≤x≤2.
The preparation method of above-mentioned visible light responded composite oxide photocatalyst, carry out according to the following steps:
1) with 99.9% analytically pure chemical raw material Li
2CO
3, SrCO
3, Nb
2O
5And Ta
2O
5, press Li
2SrNb
2-xTa
xO
7Chemical formula weigh batching, wherein 0≤x≤2;
2) step (1) confected materials is mixed, put into ball grinder, add zirconia ball and absolute ethyl alcohol, ball milling 12h mixes levigately, takes out oven dry, 200 mesh sieves;
3) powder that step (2) is mixed is 850-950 ℃ of pre-burning, and insulation 8-10h, naturally cools to room temperature, by pulverizing means such as ball mills particle diameter diminished then, is lower than 2 μ m, can obtain composite oxide photocatalyst Li
2SrNb
2-xTa
xO
7Powder.
Preparation method of the present invention is simple, cost is low, and the photochemical catalyst of preparation has excellent catalytic performance, has the effect of decomposing harmful chemical, organic-biological matter and sterilization under radiation of visible light.
The specific embodiment
To be specifically described the present invention below:
1, in order to obtain employed composite oxides among the present invention, at first use solid-phase synthesis to prepare powder, promptly various oxides or carbonate as raw material are mixed according to target composition stoichiometric proportion, synthetic in air atmosphere under normal pressure again.
2, in order effectively to utilize light, the size of the photochemical catalyst among the present invention is preferably in micron level, or even nano particle, and specific area is bigger.With the oxide powder of solid-phase synthesis preparation, its particle is big and surface area is less, but can particle diameter be diminished by pulverizing means such as ball mills.
3, as the simulation organic pollution, its concentration is 20mg/L with methyl orange in photocatalysis experiment of the present invention; The addition of bismuth-system compound oxide photocatalyst is 1g/L; Light source uses the xenon lamp of 300W, and the vessel that reactive tank uses pyrex to make obtain the light of wavelength greater than 420nm long wavelength, irradiates light catalyst then by wave filter; The catalysis time set is 120min.
Embodiment
Serve as that the present invention is described in detail on the basis with concrete practical operation example below.
Embodiment 1:
1) with 99.9% analytically pure chemical raw material Li
2CO
3, SrCO
3And Nb
2O
5, press Li
2SrNb
2O
7The chemical formula weigh batching;
2) confected materials is mixed, put into ball grinder, add zirconia ball and absolute ethyl alcohol, ball milling 12h mixes levigately, takes out oven dry, 200 mesh sieves;
3) the above-mentioned powder that mixes is 850 ℃ of pre-burnings, and insulation 8h, naturally cools to room temperature, by pulverizing means such as ball mills particle diameter diminished then, is lower than 2 μ m, can obtain composite oxide photocatalyst Li
2SrNb
2O
7Powder.
Prepared photochemical catalyst, under the radiation of visible light of wavelength greater than 420nm, 120min reaches 97.8% to the methyl orange clearance.
Embodiment 2:
1) with 99.9% analytically pure chemical raw material Li
2CO
3, SrCO
3And Ta
2O
5, press Li
2SrTa
2O
7The chemical formula weigh batching;
2) confected materials is mixed, put into ball grinder, add zirconia ball and absolute ethyl alcohol, ball milling 12h mixes levigately, takes out oven dry, 200 mesh sieves;
3) the above-mentioned powder that mixes is 950 ℃ of pre-burnings, and insulation 10h, naturally cools to room temperature, by pulverizing means such as ball mills particle diameter diminished then, is lower than 2 μ m, can obtain composite oxide photocatalyst Li
2SrTa
2O
7Powder.
Prepared photochemical catalyst, under the radiation of visible light of wavelength greater than 420nm, 120min reaches 97.6% to the methyl orange clearance.
Embodiment 3:
1) with 99.9% analytically pure chemical raw material Li
2CO
3, SrCO
3, Nb
2O
5, Ta
2O
5, press Li
2SrNbTaO
7The chemical formula weigh batching;
2) confected materials is mixed, put into ball grinder, add zirconia ball and absolute ethyl alcohol, ball milling 12h mixes levigately, takes out oven dry, 200 mesh sieves;
3) the above-mentioned powder that mixes is 900 ℃ of pre-burnings, and insulation 9h, naturally cools to room temperature, by pulverizing means such as ball mills particle diameter diminished then, is lower than 2 μ m, can obtain composite oxide photocatalyst Li
2SrNbTaO
7Powder.
Prepared photochemical catalyst, under the radiation of visible light of wavelength greater than 420nm, 120min reaches 98.8% to the methyl orange clearance.
Embodiment 4:
1) with 99.9% analytically pure chemical raw material Li
2CO
3, SrCO
3, Nb
2O
5, Ta
2O
5, press Li
2SrNb
1.5Ta
0.5O
7The chemical formula weigh batching.
2) chemical raw material for preparing is mixed, put into ball grinder, add zirconia ball and absolute ethyl alcohol, ball milling 12h mixes levigately, takes out oven dry, 200 mesh sieves.
3) the above-mentioned powder that mixes is 880 ℃ of pre-burnings, and insulation 9h, naturally cools to room temperature, pulverizes by ball mill then particle diameter is diminished, and is lower than 2 μ m, can obtain composite oxide photocatalyst Li
2SrNb
1.5Ta
0.5O
7Powder.
Prepared photochemical catalyst, under the radiation of visible light of wavelength greater than 420nm, 120min reaches 98.9% to the methyl orange clearance.
Embodiment 5:
1) with 99.9% analytically pure chemical raw material Li
2CO
3, SrCO
3, Nb
2O
5, Ta
2O
5, press Li
2SrNb
0.5Ta
1.5O
7The chemical formula weigh batching.
2) chemical raw material for preparing is mixed, put into ball grinder, add zirconia ball and absolute ethyl alcohol, ball milling 12h mixes levigately, takes out oven dry, 200 mesh sieves.
3) the above-mentioned powder that mixes is 920 ℃ of pre-burnings, and insulation 9h, naturally cools to room temperature, pulverizes by ball mill then particle diameter is diminished, and is lower than 2 μ m, can obtain composite oxide photocatalyst Li
2SrNb
0.5Ta
1.5O
7Powder.
Prepared photochemical catalyst, under the radiation of visible light of wavelength greater than 420nm, 120min reaches 98.6% to the methyl orange clearance.
The present invention never is limited to above embodiment.Have and Nb, the element of Ta analog structure and chemical property such as V, Sb etc. also can make the photochemical catalyst with analogous crystalline structure of the present invention and performance.The bound of each raw material, interval value, and the bound of technological parameter (as temperature, time etc.), interval value can both realize the present invention, do not enumerate embodiment one by one at this.
The made photocatalyst powder of above inventive embodiments can be carried on the multiple matrix surface.Matrix can be glass, pottery, active carbon, quartz sand etc., and photochemical catalyst can be carried on matrix surface with the form of film.
Claims (2)
1. composite oxides is characterized in that the chemical composition general formula of described composite oxides is: Li in visible light-responded Application in Photocatalysis
2SrNb
2-xTa
xO
7, 0≤x≤2 wherein.
2. the preparation method of composite oxides according to claim 1 is characterized in that step is:
1) with 99.9% analytically pure chemical raw material Li
2CO
3, SrCO
3, Nb
2O
5And Ta
2O
5, press Li
2SrNb
2-xTa
xO
7, chemical formula weigh batching, wherein 0≤x≤2;
2) step (1) confected materials is mixed, put into ball grinder, add zirconia ball and absolute ethyl alcohol, ball milling 12h mixes levigately, takes out oven dry, 200 mesh sieves;
3) powder that step (2) is mixed is 850-950 ℃ of pre-burning, and insulation 8-10h, naturally cools to room temperature, by ball mill pulverizing means particle diameter diminished then, is lower than 2 μ m, can obtain composite oxide photocatalyst Li
2SrNb
2-xTa
xO
7Powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110094345 CN102240542B (en) | 2011-04-13 | 2011-04-13 | Visible-light-responsive composite oxide photochemical catalyst Li2SrNb(2-x)TaxO7 and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110094345 CN102240542B (en) | 2011-04-13 | 2011-04-13 | Visible-light-responsive composite oxide photochemical catalyst Li2SrNb(2-x)TaxO7 and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102240542A true CN102240542A (en) | 2011-11-16 |
| CN102240542B CN102240542B (en) | 2013-02-27 |
Family
ID=44958898
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110094345 Expired - Fee Related CN102240542B (en) | 2011-04-13 | 2011-04-13 | Visible-light-responsive composite oxide photochemical catalyst Li2SrNb(2-x)TaxO7 and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103191714A (en) * | 2013-04-16 | 2013-07-10 | 桂林理工大学 | Layered composite oxide photocatalyst Sr2KM3O10 and preparation method thereof |
| CN104624182A (en) * | 2015-01-13 | 2015-05-20 | 三峡大学 | Visible-light response photo catalyst Sr3Li3BiW2O12 and preparation method thereof |
| CN104874391A (en) * | 2015-05-23 | 2015-09-02 | 桂林理工大学 | Visible light responding photocatalyst SrLiBi3W5O21 and preparation method thereof |
| CN104907077A (en) * | 2015-05-23 | 2015-09-16 | 桂林理工大学 | Visible-light-responsive photocatalyst SrLi3FeV8O24 and preparation method thereof |
| CN105536767A (en) * | 2016-01-12 | 2016-05-04 | 桂林理工大学 | Visible-light response photocatalyst SrLi2Ge7O16 and preparing method thereof |
| CN105561968A (en) * | 2016-01-12 | 2016-05-11 | 桂林理工大学 | Photocatalyst SrLi2GeO4 responding to visible light and preparation method thereof |
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|---|---|---|---|---|
| CN101143317A (en) * | 2007-10-18 | 2008-03-19 | 桂林工学院 | Composite oxide photocatalyst containing niobium and preparation method |
| CN101491769A (en) * | 2009-03-16 | 2009-07-29 | 天津工业大学 | Strontium carbonate with visible photoresponse and preparation method thereof |
| CN101559371A (en) * | 2009-05-08 | 2009-10-21 | 武汉理工大学 | Molybdenum-containing semi-conductor photocatalysis material responding to visible light, preparation method and application thereof |
| CN101757905A (en) * | 2010-01-02 | 2010-06-30 | 桂林理工大学 | Visible light responding composite oxide photocatalyst Li6Ti5Nb2-xTaxO18 and preparation method |
-
2011
- 2011-04-13 CN CN 201110094345 patent/CN102240542B/en not_active Expired - Fee Related
Patent Citations (4)
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|---|---|---|---|---|
| CN101143317A (en) * | 2007-10-18 | 2008-03-19 | 桂林工学院 | Composite oxide photocatalyst containing niobium and preparation method |
| CN101491769A (en) * | 2009-03-16 | 2009-07-29 | 天津工业大学 | Strontium carbonate with visible photoresponse and preparation method thereof |
| CN101559371A (en) * | 2009-05-08 | 2009-10-21 | 武汉理工大学 | Molybdenum-containing semi-conductor photocatalysis material responding to visible light, preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103191714A (en) * | 2013-04-16 | 2013-07-10 | 桂林理工大学 | Layered composite oxide photocatalyst Sr2KM3O10 and preparation method thereof |
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| CN104624182A (en) * | 2015-01-13 | 2015-05-20 | 三峡大学 | Visible-light response photo catalyst Sr3Li3BiW2O12 and preparation method thereof |
| CN104874391A (en) * | 2015-05-23 | 2015-09-02 | 桂林理工大学 | Visible light responding photocatalyst SrLiBi3W5O21 and preparation method thereof |
| CN104907077A (en) * | 2015-05-23 | 2015-09-16 | 桂林理工大学 | Visible-light-responsive photocatalyst SrLi3FeV8O24 and preparation method thereof |
| CN105536767A (en) * | 2016-01-12 | 2016-05-04 | 桂林理工大学 | Visible-light response photocatalyst SrLi2Ge7O16 and preparing method thereof |
| CN105561968A (en) * | 2016-01-12 | 2016-05-11 | 桂林理工大学 | Photocatalyst SrLi2GeO4 responding to visible light and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN102240542B (en) | 2013-02-27 |
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