CN103611559B - Bi2WO6-SrTaO2N composite photocatalyst and preparation method thereof - Google Patents
Bi2WO6-SrTaO2N composite photocatalyst and preparation method thereof Download PDFInfo
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- CN103611559B CN103611559B CN201310644514.6A CN201310644514A CN103611559B CN 103611559 B CN103611559 B CN 103611559B CN 201310644514 A CN201310644514 A CN 201310644514A CN 103611559 B CN103611559 B CN 103611559B
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Abstract
The invention discloses a Bi2WO6-SrTaO2N composite photocatalyst and a preparation method thereof, belonging to the field of inorganic functional materials. The technical scheme is as follows: the Bi2WO6-SrTaO2N composite photocatalyst is compounded from Bi2WO6 powder and SrTaO2N powder in a mole ratio of (5-15):1. The invention also discloses a preparation method of the Bi2WO6-SrTaO2N composite photocatalyst. Compared with the prior art, the Bi2WO6-SrTaO2N composite photocatalyst has the following advantages: the compounding of the Bi2WO6 and SrTaO2N can greatly widen the spectral response range of the Bi2WO6, so that the Bi2WO6 has favorable absorptivity in the visible light region, thereby enhancing the utilization ratio of solar energy; the compounding of the Bi2WO6 and SrTaO2N can effectively reduce the compound probability between photogenerated electrons and holes, and enhance the photocatalytic activity of the Bi2WO6; and the preparation method of the Bi2WO6-SrTaO2N composite photocatalyst is simple and easy to control.
Description
Technical field
The invention belongs to inorganic environment-friendly catalysis material technical field, be specifically related to a kind of Bi
2wO
6-SrTaO
2n composite photo-catalyst and preparation method thereof.
Background technology
Utilize solar energy photocatalytic decomposing organic matter to become the important means solving environmental pollution, but traditional catalysis material is as TiO
2, ZnO etc. can only absorb ultraviolet light, spectral response range is narrow, limits their practical application.Therefore, the visible light catalyst of the efficient response of design becomes one of great research topic that photocatalysis science and Environmental capacity face.Bi
2wO
6be a kind ofly novel have visible light-responded catalysis material, its energy gap is 2.8 eV, and absorbing wavelength can be less than the visible ray of 442 nm, be that one has high performance visible-light photocatalysis material.But, Bi
2wO
6the hole produced after photochemical catalyst optical excitation and the probability of electron recombination high, quantum effect is low, and photocatalytic activity is low.Therefore, the Focal point and difficult point that its photo-quantum efficiency and photocatalytic activity become photocatalysis disciplinary study is improved.
SrTaO
2n is a kind of transition metal oxynitrides, and because divalence oxygen element part is replaced by the trivalent nitrogen element that electronegativity is less, metal cation is more or less reduced, and crystal structure changes, SrTaO
2thus N shows optical, electrical, the magnetic that make new advances, mechanical property.Research shows, SrTaO
2the energy gap of N is 2.2 eV, and energy absorbing wavelength is less than the visible ray of 563 nm, is a kind of catalysis material with visible light-responded ability.In order to improve Bi
2wO
6photo-quantum efficiency, by itself and the SrTaO with ideal bandgap
2n phase compound, utilizes the energy level difference between two kinds of semiconductors that photogenerated carriers can be made to be injected on the energy level of another kind of semiconductor by a kind of energy level of semiconductive particles, electric charge is effectively separated, and is to improve Bi
2wO
6the effective way of solar energy utilization ratio and photo-quantum efficiency.Bi
2wO
6the conduction band potential E of photochemical catalyst
cB=0.46 eV, valence band electromotive force E
vB=3.26 eV, and SrTaO
2the conduction band potential E of N photochemical catalyst
cB=-0.71 eV, valence band electromotive force E
vB=1.49 eV.At Bi
2wO
6-SrTaO
2in N composite semiconductor, SrTaO
2the conduction band potential of N is more negative, and light induced electron is easily from the SrTaO that energy level is low
2n conduction band moves to the high Bi of energy level
2wO
6on conduction band; Meanwhile, Bi
2wO
6valence band electromotive force corrigendum, photohole is easily from the Bi that energy level is high
2wO
6valence band moves to the low SrTaO of energy level
2in N valence band, thus improve the separative efficiency of photogenerated charge, extend Bi
2wO
6spectral response range.
Summary of the invention
The technical problem that the present invention solves there is provided the Bi that a kind of photo-quantum efficiency is high, photocatalytic activity is good
2wO
6-SrTaO
2n composite photo-catalyst.
The present invention solve another technical problem there is provided a kind of simple to operate and be easy to control Bi
2wO
6-SrTaO
2the preparation method of N composite photo-catalyst.
Technical scheme of the present invention is: a kind of Bi
2wO
6-SrTaO
2n composite photo-catalyst, it is characterized in that by Bi
2wO
6with SrTaO
2n powder compound and the Bi formed
2wO
6-SrTaO
2n composite photo-catalyst, wherein Bi
2wO
6with SrTaO
2the mol ratio of N is 5-15:1.
Bi of the present invention
2wO
6-SrTaO
2the preparation method of N composite photo-catalyst, it is characterized in that comprising the following steps: the ratio of tantalum pentoxide, strontium carbonate and acetone 1:2:15 in molar ratio to be joined in agate mortar grinding evenly by (1), then sample is evenly laid on corundum boat, load in tube-type atmosphere furnace, under ammonia atmosphere, 1000 DEG C of calcinings obtain SrTaO in 20 hours
2n powder; (2) bismuth citrate solution is prepared, by the SrTaO of step (1) gained under the condition stirred
2n powder and sodium citrate solution join in bismuth citrate solution and obtain mixed solution A, wherein bismuth citrate and the SrTaO added
2the mol ratio of N powder is 10-30:1, and bismuth citrate is 1:1 with the mol ratio of the natrium citricum added; (3) sodium tungstate solution is prepared, sodium tungstate solution to be joined in mixed solution A to obtain mixed solution B in the condition stirred, wherein in mixed solution A, bismuth citrate is 2:1 with the mol ratio of the sodium tungstate added, then mixed solution B is kept in the water-bath of 80 DEG C 24 hours obtaining wet gel, wet gel is through 110 DEG C of dry xerogel; (4) step (3) gained xerogel is transferred to after keeping 2-12 hour at 450-600 DEG C in Muffle furnace and obtain having the Bi having high catalytic activity
2wO
6-SrTaO
2n composite photo-catalyst.
Bi of the present invention
2wO
6-SrTaO
2the preparation method of N composite photo-catalyst, is characterized in that: in described step (2), the molar concentration of bismuth citrate solution is 0.1-0.5mol/L.Bi of the present invention
2wO
6-SrTaO
2the preparation method of N composite photo-catalyst, is characterized in that: in described step (2), the molar concentration of sodium citrate solution is 0.5mol/L.Bi of the present invention
2wO
6-SrTaO
2the preparation method of N composite photo-catalyst, is characterized in that: in described step (3), the molar concentration of sodium tungstate solution is 0.1-0.5mol/L.
The present invention compared with prior art has following remarkable advantage: 1, Bi
2wO
6with SrTaO
2the compound of N can widen Bi greatly
2wO
6spectral response range, make Bi
2wO
6there is good absorption in visible region, improve the utilization rate of solar energy; 2, Bi
2wO
6with SrTaO
2the compound of N can effectively reduce the probability of recombination in light induced electron and hole, improves Bi
2wO
6photocatalytic activity; 3, Bi of the present invention
2wO
6-SrTaO
2the preparation method of N composite photo-catalyst is simple, is easy to control.
Accompanying drawing explanation
Fig. 1 is under 300W xenon lamp irradiates, Bi prepared by the embodiment of the present invention 1
2wO
6-SrTaO
2n photochemical catalyst and pure Bi
2wO
6light urges agent to the correlation curve figure (operating condition: the amount of catalyst: 1 g/L of rhodamine B degraded situation; The concentration of rhodamine B: 5 mg/L).
Detailed description of the invention:
The present invention is further described below in conjunction with embodiment.It is noted that the present invention is not limited to following each embodiment.
Embodiment 1
(1) amount of substance is respectively the tantalum pentoxide of 0.0005mol, 0.001mol, 0.075mol, strontium carbonate and acetone and joins in agate mortar grinding evenly, then sample is evenly laid on corundum boat, load in tube-type atmosphere furnace, under ammonia atmosphere, 1000 DEG C of calcinings obtain SrTaO in 20 hours
2n powder;
(2) prepare the bismuth citrate solution 100mL that molar concentration is 0.1mol/L, preparation molar concentration is the sodium citrate solution 20mL of 0.5mol/L, under agitation by step (1) gained SrTaO
2the sodium citrate solution of N powder and preparation joins in bismuth citrate solution and obtains mixed solution A;
(3) the sodium tungstate solution 50mL that molar concentration is 0.1mol/L is prepared, sodium tungstate solution to be joined in mixed solution A to obtain mixed solution B at stirring condition, then mixed solution B is kept in the water-bath of 80 DEG C 24 hours obtaining wet gel, wet gel is through 110 DEG C of dry xerogel;
(4) step (3) gained xerogel is transferred to after keeping 12 hours at 450 DEG C in Muffle furnace and obtain having the Bi having high catalytic activity
2wO
6-SrTaO
2n composite photocatalyst.
Embodiment 2
(1) amount of substance is respectively the tantalum pentoxide of 0.0005mol, 0.001mol, 0.075mol, strontium carbonate and acetone and joins in agate mortar grinding evenly, then sample is evenly laid on corundum boat, load in tube-type atmosphere furnace, under ammonia atmosphere, 1000 DEG C of calcinings obtain SrTaO in 20 hours
2n powder;
(2) prepare the bismuth citrate solution 100mL that molar concentration is 0.2mol/L, preparation molar concentration is the sodium citrate solution 40mL of 0.5mol/L, by step (1) gained SrTaO under the condition stirred
2the sodium citrate solution of N powder and preparation joins in bismuth citrate solution and obtains mixed solution A;
(3) the sodium tungstate solution 50mL that molar concentration is 0.2mol/L is prepared, sodium tungstate solution to be joined in mixed solution A to obtain mixed solution B at stirring condition, then mixed solution B is kept in the water-bath of 80 DEG C 24 hours obtaining wet gel, wet gel is through 110 DEG C of dry xerogel;
(4) step (3) gained xerogel is transferred to after keeping 6 hours at 500 DEG C in Muffle furnace and obtain having the Bi having high catalytic activity
2wO
6-SrTaO
2n composite photocatalyst.
Embodiment 3
(1) amount of substance is respectively the tantalum pentoxide of 0.0005mol, 0.001mol, 0.075mol, strontium carbonate and acetone and joins in agate mortar grinding evenly, then sample is evenly laid on corundum boat, load in tube-type atmosphere furnace, under ammonia atmosphere, 1000 DEG C of calcinings obtain SrTaO in 20 hours
2n powder;
(2) prepare the bismuth citrate solution 60mL that molar concentration is 0.5mol/L, preparation molar concentration is the sodium citrate solution 60mL of 0.5mol/L, under agitation by step (1) gained SrTaO
2the sodium citrate solution of N powder and preparation joins in bismuth citrate solution and obtains mixed solution A;
(3) the sodium tungstate solution 30mL that molar concentration is 0.5mol/L is prepared, sodium tungstate solution to be joined in mixed solution A to obtain mixed solution B at stirring condition, then mixed solution B is kept in the water-bath of 80 DEG C 24 hours obtaining wet gel, wet gel is through 110 DEG C of dry xerogel;
(4) step (3) gained xerogel is transferred to after keeping 2 hours at 600 DEG C in Muffle furnace and obtain having the Bi having high catalytic activity
2wO
6-SrTaO
2n composite photocatalyst.
Embodiment above describes general principle of the present invention, principal character and advantage.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and description just illustrates principle of the present invention; under the scope not departing from the principle of the invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the scope of protection of the invention.
Claims (4)
1. a Bi
2wO
6-SrTaO
2the preparation method of N composite photo-catalyst, it is characterized in that specifically comprising the following steps: the ratio of tantalum pentoxide, strontium carbonate and acetone 1:2:15 in molar ratio to be joined in agate mortar grinding evenly by (1), then sample is evenly laid on corundum boat, load in tube-type atmosphere furnace, under ammonia atmosphere, 1000 DEG C of calcinings obtain SrTaO in 20 hours
2n powder; (2) bismuth citrate solution is prepared, by the SrTaO of step (1) gained under the condition stirred
2n powder and sodium citrate solution join in bismuth citrate solution and obtain mixed solution A, wherein bismuth citrate and the SrTaO added
2the mol ratio of N powder is 10-30:1, and bismuth citrate is 1:1 with the mol ratio of the natrium citricum added; (3) sodium tungstate solution is prepared, sodium tungstate solution to be joined in mixed solution A to obtain mixed solution B in the condition stirred, wherein in mixed solution A, bismuth citrate is 2:1 with the mol ratio of the sodium tungstate added, then mixed solution B is kept in the water-bath of 80 DEG C 24 hours obtaining wet gel, wet gel is through 110 DEG C of dry xerogel; (4) step (3) gained xerogel is transferred to after keeping 2-12 hour at 450-600 DEG C in Muffle furnace and obtain having the Bi having high catalytic activity
2wO
6-SrTaO
2n composite photo-catalyst.
2. Bi according to claim 1
2wO
6-SrTaO
2the preparation method of N composite photo-catalyst, is characterized in that: in step (2), the molar concentration of bismuth citrate solution is 0.1-0.5mol/L.
3. Bi according to claim 1
2wO
6-SrTaO
2the preparation method of N composite photo-catalyst, is characterized in that: in step (2), the molar concentration of sodium citrate solution is 0.5mol/L.
4. Bi according to claim 1
2wO
6-SrTaO
2the preparation method of N composite photo-catalyst, is characterized in that: in step (3), the molar concentration of sodium tungstate solution is 0.1-0.5mol/L.
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| CN104190407B (en) * | 2014-09-24 | 2016-08-24 | 桂林理工大学 | Visible light-responded photocatalyst SrBi2w6o22and preparation method thereof |
| CN112973665B (en) * | 2019-12-02 | 2023-08-15 | 南京工业大学 | Low-temperature preparation of high-performance monocrystal SrTaO 2 Method for N photo-anode |
Citations (4)
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|---|---|---|---|---|
| CN1542998A (en) * | 2003-11-05 | 2004-11-03 | �Ϻ���ͨ��ѧ | Porous membrane semiconductor optical electrode having visible light response and photoelectrochemical reaction equipment and preparation thereof |
| CN102371173A (en) * | 2010-08-16 | 2012-03-14 | 华东理工大学 | Supported bismuth tungstate photocatalyst and preparation method thereof |
| CN102765758A (en) * | 2012-08-06 | 2012-11-07 | 河南师范大学 | Sol-gel-hydrothermal method for preparing bismuth tungstate and indium-doped bismuth tungstate |
| CN102947247A (en) * | 2010-03-02 | 2013-02-27 | 特洁安科技有限公司 | Photocatalyst composition of matter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1542998A (en) * | 2003-11-05 | 2004-11-03 | �Ϻ���ͨ��ѧ | Porous membrane semiconductor optical electrode having visible light response and photoelectrochemical reaction equipment and preparation thereof |
| CN102947247A (en) * | 2010-03-02 | 2013-02-27 | 特洁安科技有限公司 | Photocatalyst composition of matter |
| CN102371173A (en) * | 2010-08-16 | 2012-03-14 | 华东理工大学 | Supported bismuth tungstate photocatalyst and preparation method thereof |
| CN102765758A (en) * | 2012-08-06 | 2012-11-07 | 河南师范大学 | Sol-gel-hydrothermal method for preparing bismuth tungstate and indium-doped bismuth tungstate |
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