CN104307509A - Visible light responding photocatalyst Li3LaWO6 and preparation method thereof - Google Patents
Visible light responding photocatalyst Li3LaWO6 and preparation method thereof Download PDFInfo
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- CN104307509A CN104307509A CN201410574353.2A CN201410574353A CN104307509A CN 104307509 A CN104307509 A CN 104307509A CN 201410574353 A CN201410574353 A CN 201410574353A CN 104307509 A CN104307509 A CN 104307509A
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- visible light
- preparation
- lawo
- photocatalyst
- photochemical catalyst
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Abstract
The invention discloses a visible light responding photocatalyst Li3LaWO6 and a preparation method thereof. The photocatalyst has the following chemical formula: Li3LaWO6. The invention also discloses the preparation method of the visible light responding photocatalyst Li3LaWO6. The photocatalyst obtained by the preparation method disclosed by the invention has the advantages of wide spectral response range, high light conversion rate, good stability and the like and has the effects of decomposing harmful chemical substances and organic biomasses and sterilizing under the irradiation of visible light; in addition, the preparation method is simple, low in synthesis temperature and cost and suitable for industrial production and application.
Description
Technical field
The present invention relates to a kind of visible light-responded photocatalyst Li
3laWO
6and preparation method thereof, belong to inorganic field of photocatalytic material.
Background technology
Along with socioeconomic development, people more and more pay close attention to for the energy and ecological environment, solve energy shortage and problem of environmental pollution be realize sustainable development, improve people's living standard and safeguard national security in the urgent need to.
From phase late 1970s, there has been proposed and to utilize in photochemical catalyst decomposition water and the organic matter such as agricultural chemicals in air and odorant, and scribble the application example such as self-cleaning of the surface of solids of photochemical catalyst.The principle of light-catalyzed reaction is that photochemical catalyst is after absorbing the photon higher than its band-gap energy, generate hole and electronics, these holes and electronics carry out oxidation reaction and reduction reaction respectively, reach the object of decomposing harmful chemical, organic-biological matter and sterilization.Photochemical catalyst has many kinds, and wherein most representative is titanium dioxide (TiO
2), titanium dioxide has been utilized to decompose organic matters such as the agricultural chemicals in water and in air and odorants, but the band gap of titanium dioxide is 3.2eV, only under the ultraviolet irradiation shorter than 400nm, just activity can be shown, can only at indoor or the local work having uviol lamp, almost can not utilize visible ray, this limits the use of titanium dioxide optical catalyst greatly.
Consider the practicality of photochemical catalyst in decomposing harmful substances, utilize sunshine to be indispensable as light source.Irradiate maximum to sunshine medium wavelength intensity of visible ray near 500nm on earth's surface, wavelength is the energy of the visible region of 400nm ~ 750nm is approximately 43% of sunshine gross energy, so in order to efficient utilization, the R and D of bismuth series photocatalyst have achieved a series of great achievement, and bismuthous compound is as BiVO
4, Bi
2moO
6, Bi
2mo
2o
9, Bi
2mo
3o
12and Bi
2wO
4be in the news and there is good absorption under visible light.A series of niobium (tantalum) hydrochlorate photochemical catalyst is widely studied owing to having higher photocatalytic activity.Such as, niobate photocatalyst Pb
3nb
4o
13, BiNbO
4and Bi
2mNbO
7(M=Al, Ga, In, Y, rare earth element and Fe) etc. with niobium potassium compound oxide photocatalyst as KNbO
3, KNb
3o
8, K
4nb
6o
17and K
6nb
10.6o
30deng all, there is good photocatalysis performance, but its intrinsic photocatalytic effect is very weak or do not have activity in visible-range.
Although photocatalysis research has carried out the several years, but at present report to have visible light-responded photochemical catalyst kind still very limited, still also exist that light conversion efficiency is low, poor stability and the problem such as spectral response range is narrow, so it is very necessary for researching and developing the new visible light-responded high efficiency photocatalyst that has.We are to consisting of Li
3laWO
6, Li
3ndWO
6, Li
3smWO
6, Li
3euWO
6compound carried out Photocatalytic Performance Study, found that Li
3laWO
6band gap be 2.65eV, there is excellent visible light-responded photocatalysis performance; And other sample is insulator, band gap width is all greater than 3.2eV, just can only can show activity under ultraviolet irradiation.
Summary of the invention
The object of this invention is to provide and a kind of there is visible light-responded photocatalyst Li
3laWO
6and preparation method thereof.
The chemical constitution formula with visible light-responded photochemical catalyst that the present invention relates to is: Li
3laWO
6.
Preparation method's concrete steps of above-mentioned visible light-responded photochemical catalyst are:
(1) by 99.9% analytically pure chemical raw material Li
2o, La
2o
3and WO
3starting powder press Li
3laWO
6composition weigh batching.
(2) raw material mixing step (1) prepared, put into ball grinder, add zirconia ball and distilled water, ball milling 8 hours, is mixed and finely ground, and takes out and dries, and crosses 200 mesh sieves.
(3) powder step (2) mixed 800 ~ 850 DEG C of pre-burnings, and is incubated 6 hours, naturally cools to room temperature, is then pulverized by ball mill and average diameter of particles is diminished, lower than 2 μm, namely obtain Li
3laWO
6powder.
The spectral response range of the photochemical catalyst that the present invention obtains is wide, the high and good stability of light conversion efficiency, has the effect of decomposing harmful chemical, organic-biological matter and sterilization under visible light illumination; Preparation method is simple in addition, synthesis temperature is low, and cost is low, is applicable to industrial production and application.
Detailed description of the invention
To be specifically described the present invention below:
1, in order to obtain the composite oxides used in the present invention, first use solid-phase synthesis to prepare powder, namely using as the various oxide of raw material or carbonate according to the metering of target constitutional chemistry than mixing, then to synthesize in air atmosphere at ambient pressure.
2, in order to effectively utilize light, the size of the photochemical catalyst in the present invention is preferably in micron level, or even nano particle, and specific area is larger.With oxide powder prepared by solid-phase synthesis, its particle is comparatively large and surface area is less, but can pulverize means by ball mill makes particle diameter diminish.
3, photocatalysis experiment of the present invention is using methyl orange as simulation organic pollution, and its concentration is 20mg/L; Photocatalyst Li
3laWO
6addition be 1g/L; Light source uses the xenon lamp of 300W, the vessel that reactive tank uses pyrex to make, and obtains the light that wavelength is greater than 420nm, then irradiate photochemical catalyst by wave filter; Catalysis time is set as 60 minutes.
Embodiment 1:
(1) by 99.9% analytically pure chemical raw material Li
2o, La
2o
3and WO
3starting powder press Li
3laWO
6composition weigh batching.
(2) raw material mixing step (1) prepared, put into ball grinder, add zirconia ball and distilled water, ball milling 8 hours, is mixed and finely ground, and takes out and dries, and crosses 200 mesh sieves.
(3) powder step (2) mixed 800 DEG C of pre-burnings, and is incubated 6 hours, naturally cools to room temperature, is then pulverized by ball mill and average diameter of particles is diminished, lower than 2 μm, namely obtain Li
3laWO
6powder.
Prepared photochemical catalyst, under being greater than the radiation of visible light of 420nm, reaches 97.7% to methyl orange clearance in 60 minutes at wavelength.
Embodiment 2:
(1) by 99.9% analytically pure chemical raw material Li
2o, La
2o
3and WO
3starting powder press Li
3laWO
6composition weigh batching.
(2) raw material mixing step (1) prepared, put into ball grinder, add zirconia ball and distilled water, ball milling 8 hours, is mixed and finely ground, and takes out and dries, and crosses 200 mesh sieves.
(3) powder step (2) mixed 820 DEG C of pre-burnings, and is incubated 6 hours, naturally cools to room temperature, is then pulverized by ball mill and average diameter of particles is diminished, lower than 2 μm, namely obtain Li
3laWO
6powder.
Prepared photochemical catalyst, under being greater than the radiation of visible light of 420nm, reaches 98.4% to methyl orange clearance in 60 minutes at wavelength.
Embodiment 3:
(1) by 99.9% analytically pure chemical raw material Li
2o, La
2o
3and WO
3starting powder press Li
3laWO
6composition weigh batching.
(2) raw material mixing step (1) prepared, put into ball grinder, add zirconia ball and distilled water, ball milling 8 hours, is mixed and finely ground, and takes out and dries, and crosses 200 mesh sieves.
(3) powder step (2) mixed 850 DEG C of pre-burnings, and is incubated 6 hours, naturally cools to room temperature, is then pulverized by ball mill and average diameter of particles is diminished, lower than 2 μm, namely obtain Li
3laWO
6powder.
Prepared photochemical catalyst, be greater than the radiation of visible light of 420nm at wavelength under, 60min reaches 98.0% to methyl orange clearance.
The present invention is never limited to above embodiment.Bound, the interval value of each temperature can realize the present invention, do not enumerate embodiment at this.
The made photocatalyst powder of above inventive embodiments can be carried on multiple matrix surface.Matrix can be glass, pottery, active carbon or quartz sand etc., and photochemical catalyst can be carried on matrix surface in the form of a film.
Claims (1)
1. a visible light-responded photochemical catalyst, is characterized in that the chemical constitution formula of described photochemical catalyst is Li
3laWO
6;
Preparation method's concrete steps of described photochemical catalyst are:
(1) by 99.9% analytically pure chemical raw material Li
2o, La
2o
3and WO
3starting powder press Li
3laWO
6composition weigh batching;
(2) raw material mixing step (1) prepared, put into ball grinder, add zirconia ball and distilled water, ball milling 8 hours, is mixed and finely ground, and takes out and dries, and crosses 200 mesh sieves;
(3) powder step (2) mixed 800 ~ 850 DEG C of pre-burnings, and is incubated 6 hours, naturally cools to room temperature, is then pulverized by ball mill and makes average diameter of particles lower than 2 μm, namely obtain Li
3laWO
6powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410574353.2A CN104307509A (en) | 2014-10-24 | 2014-10-24 | Visible light responding photocatalyst Li3LaWO6 and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410574353.2A CN104307509A (en) | 2014-10-24 | 2014-10-24 | Visible light responding photocatalyst Li3LaWO6 and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104307509A true CN104307509A (en) | 2015-01-28 |
Family
ID=52362901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410574353.2A Pending CN104307509A (en) | 2014-10-24 | 2014-10-24 | Visible light responding photocatalyst Li3LaWO6 and preparation method thereof |
Country Status (1)
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|---|---|
| CN (1) | CN104307509A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104888757A (en) * | 2015-05-23 | 2015-09-09 | 桂林理工大学 | Visible-light-responded photocatalyst SrLi3La3W2O13 and preparation method thereof |
| CN109680178A (en) * | 2018-12-05 | 2019-04-26 | 盐城工学院 | A kind of preparation method and application of tungsten base nanometer floral material |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11139844A (en) * | 1997-09-01 | 1999-05-25 | Ohara Inc | Optical glass |
| CN103111284A (en) * | 2013-03-24 | 2013-05-22 | 桂林理工大学 | Visible-light response vanadium composite oxide photocatalyst Li3MMo3O12 and preparation method thereof |
| CN103111288A (en) * | 2013-03-24 | 2013-05-22 | 桂林理工大学 | Visible-light responsive tungstenic composite oxide photocatalyst Li2WO4 and preparation method thereof |
| CN103157459A (en) * | 2013-04-01 | 2013-06-19 | 桂林理工大学 | Visible-light-responsive vanadate photocatalyst LiMVO4 and preparation method thereof |
| CN103191724A (en) * | 2013-04-01 | 2013-07-10 | 桂林理工大学 | Visible-light-responded molybdate photocatalyst Li8M2Mo7O28 and preparation method thereof |
-
2014
- 2014-10-24 CN CN201410574353.2A patent/CN104307509A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11139844A (en) * | 1997-09-01 | 1999-05-25 | Ohara Inc | Optical glass |
| CN103111284A (en) * | 2013-03-24 | 2013-05-22 | 桂林理工大学 | Visible-light response vanadium composite oxide photocatalyst Li3MMo3O12 and preparation method thereof |
| CN103111288A (en) * | 2013-03-24 | 2013-05-22 | 桂林理工大学 | Visible-light responsive tungstenic composite oxide photocatalyst Li2WO4 and preparation method thereof |
| CN103157459A (en) * | 2013-04-01 | 2013-06-19 | 桂林理工大学 | Visible-light-responsive vanadate photocatalyst LiMVO4 and preparation method thereof |
| CN103191724A (en) * | 2013-04-01 | 2013-07-10 | 桂林理工大学 | Visible-light-responded molybdate photocatalyst Li8M2Mo7O28 and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104888757A (en) * | 2015-05-23 | 2015-09-09 | 桂林理工大学 | Visible-light-responded photocatalyst SrLi3La3W2O13 and preparation method thereof |
| CN109680178A (en) * | 2018-12-05 | 2019-04-26 | 盐城工学院 | A kind of preparation method and application of tungsten base nanometer floral material |
| CN109680178B (en) * | 2018-12-05 | 2020-12-01 | 盐城工学院 | Preparation method and application of tungsten-based nanoflower material |
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Application publication date: 20150128 |
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