CN101632924A - Compound oxide photocatalyst Bi4V(2-x)MxO(11-x/2) and preparation method thereof - Google Patents

Abstract

The invention discloses a compound oxide photocatalyst Bi4V(2-x)MxO(11-x/2) and a preparation method thereof. The chemical formula of the compound oxide photocatalyst is Bi4V(2-x)MxO(11-x/2), wherein M is one of Ti, Sn and Zr, and x is more than 0 and less than or equal to 0.8. The method comprises the following steps: weighing and confecting the chemical materials Bi2O3, V2O5 and MO2 with analytical purity of 99.9 percent by the chemical formula Bi4V(2-x)MxO(11-x/2), wherein M is one of Ti, Sn and Zr, x is more than 0 and less than or equal to 0.8; placing the confected materials into a mill pot, adding zirconia ball and absolute ethyl alcohol, ball-milling for 8-10 h, mixing and levigating, taking out, drying, sieving by a 200 mu sieve; presintering the evenly-mixed powder at a temperature of 800-950 DEG C and preserving heat for 4-8 h, cooling naturally to be a room temperature, micrifying the particle diameter to be about 2 um by ball milling to obtain the compound oxide photocatalyst Bi4V(2-x)MxO(11-x/2) powder. The invention is featured by simple preparation method and low cost; and the prepared photocatalyst has excellent catalysis performance.

Description

Compound oxide photocatalyst Bi 4V 2-xM xO 11-x/2And preparation method thereof

Technical field

The present invention relates to a kind of visible light-responded bismuth-system compound oxide photocatalyst Bi ₄V _2-xM _xO _11-x/2And preparation method thereof, belong to inorganic field of photocatalytic material.

Background technology

Since 20th century, rapid growth of economy is brought serious negative effect-earth environment problem.Environmental pollution is the problem that countries in the world are extremely paid close attention to, and has caused drinking water source, the industry water source quality of people's lives constantly to descend, and causes atmosphere pollution constantly to aggravate, and causes the continuous destruction of ecological environment, and human existence is constituted a serious threat.In order to address these problems, people control by the whole bag of tricks and curb environmental pollution.Studies show that in a large number nearly all organic pollution can both be the inorganic molecules material by photocatalytic degradation, decolouring, detoxification, mineralising effectively, thereby eliminate pollution and harm environment.

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.At present, the photochemical catalyst that uses is mainly titanium dioxide, 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 almost can not utilize visible light indoor or the local work of uviol lamp is arranged, this has limited the use of titanium dioxide optical catalyst greatly.

Therefore, develop the hot issue that the catalyst that has the high light catalytic activity under a kind of novel visible light has again become photocatalysis field.And in decades recently, a series of niobiums (tantalum) hydrochlorate photochemical catalyst is widely studied owing to having higher photocatalytic activity.For example, niobate photocatalyst Pb ₃Nb ₄O ₁₃, BiNbO ₄And Bi ₂MNbO ₇(M=Al, Ga, In, Y, rare earth element and Fe) etc. and niobium potassium compound oxide photocatalyst such as KNbO ₃, KNb ₃O ₈, K ₄Nb ₆O ₁₇And K ₆Nb _10.6O ₃₀Deng all having photocatalysis performance preferably.At present, the R and D of bismuth series photocatalyst have obtained a series of great achievements, and bismuthous compound is as BiVO ₄And Bi ₂WO ₄Be reported in and have good absorption under the visible light, and the pentavalent bismuth has equally also caused widely and used.

At present report to have visible light-responded photochemical catalyst kind still very limited, be 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 visible light responded composite oxide photocatalyst Bi that has ₄V _2-xM _xO _11-x/2With 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: Bi ₄V _2-xM _xO _11-x/2, wherein: M is a kind of among Ti, Sn and the Zr, 0＜x≤0.8.

Above-mentioned visible light responded composite oxide photocatalyst Bi ₄V _2-xM _xO _11-x/2The preparation method, it is characterized in that, carry out according to the following steps:

1) with 99.9% analytically pure chemical raw material Bi ₂O ₃, V ₂O ₅And MO ₂, press Bi ₄V _2-xM _xO _11-x/2Chemical formula weigh batching, M are a kind of among Ti, Sn and the Zr, 0＜x≤0.8;

2) confected materials is put into ball grinder, add zirconia ball and absolute ethyl alcohol, ball milling 8-10h mixes levigately, takes out oven dry, mistake 200 mesh sieves;

3) the above-mentioned powder that mixes is 800-950 ℃ of pre-burning, and insulation 4-8h, naturally cools to room temperature, by ball mill grinding particle diameter diminished then, reaches about 2 μ m, can obtain compound oxide photocatalyst Bi ₄V _2-xM _xO _11-x/2Powder.

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 Bi ₂O ₃, V ₂O ₅And TiO ₂, press Bi ₄V _1.9Ti _0.1O _10.95The chemical formula weigh batching;

2) confected materials is put into ball grinder, add zirconia ball and absolute ethyl alcohol, ball milling 8h mixes levigately, takes out oven dry, mistake 200 mesh sieves;

3) the above-mentioned powder that mixes is 800 ℃ of pre-burnings, and insulation 8h, naturally cools to room temperature, pulverizes by ball mill then particle diameter is diminished, and reaches about 2 μ m, can obtain compound oxide photocatalyst Bi ₄V _1.9Ti _0.1O _10.95Powder.

Prepared photochemical catalyst, under the radiation of visible light of wavelength greater than 420nm, 120min reaches 98.5% to the methyl orange clearance.

Embodiment 2:

1) with 99.9% analytically pure chemical raw material Bi ₂O ₃, V ₂O ₅And SnO ₂, press Bi ₄V _1.6Sn _0.4O _10.8The chemical formula weigh batching;

2) confected materials is put into ball grinder, add zirconia ball and absolute ethyl alcohol, ball milling 10h mixes levigately, takes out oven dry, mistake 200 mesh sieves;

3) the above-mentioned powder that mixes is 870 ℃ of pre-burnings, and insulation 6h, naturally cools to room temperature, pulverizes by ball mill then particle diameter is diminished, and reaches about 2 μ m, can obtain compound oxide photocatalyst Bi ₄V _1.6Sn _0.4O _10.8Powder.

Prepared photochemical catalyst, under the radiation of visible light of wavelength greater than 420nm, 120min reaches 98% to the methyl orange clearance.

Embodiment 3:

1) with 99.9% analytically pure chemical raw material Bi ₂O ₃, V ₂O ₅And TiO ₂, press Bi ₄V _1.3Ti _0.7O _10.65The chemical formula weigh batching;

2) confected materials is put into ball grinder, add zirconia ball and absolute ethyl alcohol, ball milling 8h mixes levigately, takes out oven dry, mistake 200 mesh sieves;

3) the above-mentioned powder that mixes is 930 ℃ of pre-burnings, and insulation 4h, naturally cools to room temperature, pulverizes by ball mill then particle diameter is diminished, and reaches about 2 μ m, can obtain compound oxide photocatalyst Bi ₄V _1.3Ti _0.7O _10.65Powder.

Prepared photochemical catalyst, under the radiation of visible light of wavelength greater than 420nm, 120min reaches 98.6% to the methyl orange clearance.

Embodiment 4:

1) with 99.9% analytically pure chemical raw material Bi ₂O ₃, V ₂O ₅And ZrO ₂, press Bi ₄V _1.2Zr _0.8O _10.6The chemical formula weigh batching;

2) confected materials is put into ball grinder, add zirconia ball and absolute ethyl alcohol, ball milling 8h mixes levigately, takes out oven dry, mistake 200 mesh sieves;

3) the above-mentioned powder that mixes is 950 ℃ of pre-burnings, and insulation 4h, naturally cools to room temperature, pulverizes by ball mill then particle diameter is diminished, and reaches about 2 μ m, can obtain compound oxide photocatalyst Bi ₄V _1.2Zr _0.8O _10.6Powder.

Prepared photochemical catalyst, under the radiation of visible light of wavelength greater than 420nm, 120min reaches 97.6% to the methyl orange clearance.

The present invention never is limited to above embodiment.M is the compound of two or more elements such as Ti, Sn and Zr, also can make the photochemical catalyst with analogous crystalline structure of the present invention and performance.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. a compound oxide photocatalyst is characterized in that the chemical composition general formula of compound oxide photocatalyst is: Bi ₄V _2-xM _xO _11-x/2, wherein: M is a kind of among Ti, Sn and the Zr, 0＜x≤0.8.

2. compound oxide photocatalyst Bi as claimed in claim 1 ₄V _2-xM _xO _11-x/2The preparation method, it is characterized in that step is:

1) with 99.9% analytically pure chemical raw material Bi ₂O ₃, V ₂O ₅And MO ₂, press Bi ₄V _2-xM _xO _11-x/2Chemical formula weigh batching, M are a kind of among Ti, Sn and the Zr, 0＜x≤0.8;

2) confected materials is put into ball grinder, add zirconia ball and absolute ethyl alcohol, ball milling 8-10h mixes levigately, takes out oven dry, mistake 200 mesh sieves;

3) the above-mentioned powder that mixes is 800-950 ℃ of pre-burning, and insulation 4-8h, naturally cools to room temperature, by ball mill grinding particle diameter diminished then, reaches about 2 μ m, can obtain compound oxide photocatalyst Bi ₄V _2-xM _xO _11-x/2Powder.