CN103706352A - Visible light response photocatalyst SrLa10V4O26 and preparation method thereof - Google Patents

Abstract

The invention discloses a visible light response photocatalyst SrLa10V4O26 and a preparation method thereof. The chemical composition formula of the photocatalyst is SrLa10V4O26. The preparation method is as follows: (1) weighing 99.9% analytical pure chemical raw material SrCO3, La2O3 and V2O5 for dosing according to the chemical formula SrLa10V4O26; (2) mixing the dosed raw materials of the step (1) to put into a ball milling jar, adding zirconia balls and anhydrous ethanol for 8 hours of ball mill, mixing and finely milling, taking out and drying, sieving with a 200 mesh sieve; and (3) presintering the evenly-mixed powder at 850-880 DEG C, keeping warm for 6 hours, naturally cooling to room temperature, and diminishing the particle diameter by ball mill grinding to less than 2 microns to obtain the SrLa10V4O26 powder. The preparation method is simple and low in cost, and the prepared photocatalyst has good catalytic performances, can decompose hazardous chemicals under visible light irradiation, is good in stability, and has good application prospects.

Description

Visible light-responded photochemical catalyst SrLa 10v 4o 26and preparation method thereof

Technical field

The present invention relates to a kind of visible light-responded photochemical catalyst SrLa ₁₀v ₄o ₂₆and 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 and be realize sustainable development, improve people's living standard and safeguard national security in the urgent need to.

From phase late 1970s, people proposed to utilize in photochemical catalyst decomposition water and atmosphere in agricultural chemicals and the 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 the photon having absorbed higher than its band-gap energy, hole and electronics have been generated, these holes and electronics carry out respectively oxidation reaction and reduction reaction, 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), utilized titanium dioxide to decompose organic matters such as the agricultural chemicals in water and in atmosphere and odorants, yet the band gap of titanium dioxide is 3.2eV, only under the ultraviolet irradiation shorter than 400nm, just can show activity, can only be indoor or have a local work of uviol lamp, almost can not utilize visible ray, 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 maximum near sunshine medium wavelength visible light intensity 500nm on earth's surface, wavelength is that the energy of the visible region of 400nm ~ 750nm is approximately 43% of sunshine gross energy, so for efficient utilization, the R and D of bismuth series photocatalyst have obtained a series of great achievements, and bismuthous compound is as BiVO ₄, Bi ₂moO ₆, Bi ₂mo ₂o ₉, Bi ₂mo ₃o ₁₂and Bi ₂wO ₄be reported in and under visible ray, there is good absorption.A series of niobiums (tantalum) hydrochlorate photochemical catalyst is because the photocatalytic activity having compared with high is widely studied.For example, niobate photocatalyst Pb ₃nb ₄o ₁₃, BiNbO ₄and Bi ₂mNbO ₇(M=Al, Ga, In, Y, rare earth element or Fe) etc. with niobium potassium compound oxide photocatalyst as KNbO ₃, KNb ₃o ₈, K ₄nb ₆o ₁₇and K ₆nb _10.6o ₃₀deng all thering is good photocatalysis performance.

Although photocatalysis research has been carried out the several years, but at present report to have visible light-responded photochemical catalyst kind still very limited, still exist that light conversion efficiency is low, poor stability and the problem such as spectrum respective range is narrow, so research and develop the new visible light-responded high efficiency photocatalyst that has, be very necessary.We are to SrLa recently ₁₀v ₄o ₂₆, BaLa ₁₀v ₄o ₂₆and CaLa ₁₀v ₄o ₂₆deng having carried out Photocatalytic Performance Study, found that SrLa ₁₀v ₄o ₂₆there is excellent visible light-responded photocatalysis performance, but BaLa ₁₀v ₄o ₂₆and CaLa ₁₀v ₄o ₂₆but do not there is visible light-responded photocatalysis performance.

Summary of the invention

The object of this invention is to provide a kind of visible light-responded photochemical catalyst SrLa that has ₁₀v ₄o ₂₆and preparation method thereof.

The chemical constitution formula with visible light-responded photochemical catalyst the present invention relates to is: SrLa ₁₀v ₄o ₂₆.

Preparation method's concrete steps of above-mentioned visible light-responded photochemical catalyst are:

(1) by 99.9% analytically pure chemical raw material SrCO ₃, La ₂o ₃and V ₂o ₅, by SrLa ₁₀v ₄o ₂₆chemical formula weigh batching.

(2) raw material step (1) being prepared mixes, and puts into ball grinder, adds zirconia ball and absolute ethyl alcohol, and ball milling 8 hours, is mixed and finely ground, and takes out and dries, and crosses 200 mesh sieves.

(3) powder step (2) being mixed is 850 ~ 880 ℃ of pre-burnings, and is incubated 6 hours, naturally cools to room temperature, then by ball mill pulverizing means, particle diameter diminished, and lower than 2 μ m, obtains SrLa ₁₀v ₄o ₂₆powder.

Preparation method of the present invention is simple, cost is low, and the photochemical catalyst of preparation has good 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, the composite oxides in order to obtain using in the present invention, are first used solid-phase synthesis to prepare powder, the various oxides as raw material or carbonate measured than mixing according to target constitutional chemistry, more synthetic in air atmosphere under normal pressure.

2, in order effectively to 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.The oxide powder of preparing with solid-phase synthesis, its particle is compared with large and surface area is less, but can particle diameter be diminished by ball mill pulverizing means.

3, photocatalysis experiment of the present invention is usingd methyl orange as simulation organic pollution, and its concentration is 20mg/L; Photochemical catalyst SrLa ₁₀v ₄o ₂₆addition be 1g/L; Light source is used the xenon lamp of 300W, and the vessel that reactive tank is used pyrex to make, obtain by wave filter the light that wavelength is greater than 420nm long wavelength, then irradiate photochemical catalyst; Catalysis time is set as 120 minutes.

Embodiment 1:

(1) by 99.9% analytically pure chemical raw material SrCO ₃, La ₂o ₃and V ₂o ₅, by SrLa ₁₀v ₄o ₂₆chemical formula weigh batching.

(2) raw material step (1) being prepared mixes, and puts into ball grinder, adds zirconia ball and absolute ethyl alcohol, and ball milling 8 hours, is mixed and finely ground, and takes out and dries, and crosses 200 mesh sieves.

(3) powder step (2) being mixed is 850 ℃ of pre-burnings, and is incubated 6 hours, naturally cools to room temperature, then by ball mill pulverizing means, particle diameter diminished, and lower than 2 μ m, obtains SrLa ₁₀v ₄o ₂₆powder.

Prepared photochemical catalyst, is greater than at wavelength under the radiation of visible light of 420nm, methyl orange clearance is reached to 98.8% in 120 minutes.

Embodiment 2:

(1) by 99.9% analytically pure chemical raw material SrCO ₃, La ₂o ₃and V ₂o ₅, by SrLa ₁₀v ₄o ₂₆chemical formula weigh batching.

(2) raw material step (1) being prepared mixes, and puts into ball grinder, adds zirconia ball and absolute ethyl alcohol, and ball milling 8 hours, is mixed and finely ground, and takes out and dries, and crosses 200 mesh sieves.

(3) powder step (2) being mixed is 870 ℃ of pre-burnings, and is incubated 6 hours, naturally cools to room temperature, then by ball mill pulverizing means, particle diameter diminished, and lower than 2 μ m, obtains SrLa ₁₀v ₄o ₂₆powder.

Prepared photochemical catalyst, is greater than at wavelength under the radiation of visible light of 420nm, methyl orange clearance is reached to 99.1% in 120 minutes.

Embodiment 3:

(1) by 99.9% analytically pure chemical raw material SrCO ₃, La ₂o ₃and V ₂o ₅, by SrLa ₁₀v ₄o ₂₆chemical formula weigh batching.

(2) raw material step (1) being prepared mixes, and puts into ball grinder, adds zirconia ball and absolute ethyl alcohol, and ball milling 8 hours, is mixed and finely ground, and takes out and dries, and crosses 200 mesh sieves.

(3) powder step (2) being mixed is 880 ℃ of pre-burnings, and is incubated 6 hours, naturally cools to room temperature, then by ball mill pulverizing means, particle diameter diminished, and lower than 2 μ m, obtains SrLa ₁₀v ₄o ₂₆powder.

Prepared photochemical catalyst, is greater than at wavelength under the radiation of visible light of 420nm, and 120min reaches 98.3% to methyl orange clearance.

The present invention is never limited to above embodiment.The bound of each temperature, interval value can realize the present invention, at this, do not enumerate embodiment.

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 with the form of film.

Claims (1)

1. a visible light-responded photochemical catalyst, is characterized in that the chemical constitution formula of described photochemical catalyst is: SrLa ₁₀v ₄o ₂₆;

Preparation method's concrete steps of described photochemical catalyst are:

(1) by 99.9% analytically pure chemical raw material SrCO ₃, La ₂o ₃and V ₂o ₅, by SrLa ₁₀v ₄o ₂₆chemical formula weigh batching;

(2) raw material step (1) being prepared mixes, and puts into ball grinder, adds zirconia ball and absolute ethyl alcohol, and ball milling 8 hours, is mixed and finely ground, and takes out and dries, and crosses 200 mesh sieves;

(3) powder step (2) being mixed is 850 ~ 880 ℃ of pre-burnings, and is incubated 6 hours, naturally cools to room temperature, then by ball mill pulverizing means, particle diameter diminished, and lower than 2 μ m, obtains SrLa ₁₀v ₄o ₂₆powder.