CN108187699A - BiOX-Bi4O5X2Hetero-junctions and its preparation method and application - Google Patents
BiOX-Bi4O5X2Hetero-junctions and its preparation method and application Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 32
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 7
- 239000007864 aqueous solution Substances 0.000 claims description 34
- 239000000126 substance Substances 0.000 claims description 24
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 20
- 238000010521 absorption reaction Methods 0.000 claims description 19
- 239000008103 glucose Substances 0.000 claims description 18
- 238000001354 calcination Methods 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 239000007795 chemical reaction product Substances 0.000 claims description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- 239000013078 crystal Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000003054 catalyst Substances 0.000 claims description 8
- 235000019441 ethanol Nutrition 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 229910000416 bismuth oxide Inorganic materials 0.000 claims description 4
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 claims description 4
- 230000012010 growth Effects 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- FIMTUWGINXDGCK-UHFFFAOYSA-H dibismuth;oxalate Chemical compound [Bi+3].[Bi+3].[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O FIMTUWGINXDGCK-UHFFFAOYSA-H 0.000 claims description 2
- RXPAJWPEYBDXOG-UHFFFAOYSA-N hydron;methyl 4-methoxypyridine-2-carboxylate;chloride Chemical compound Cl.COC(=O)C1=CC(OC)=CC=N1 RXPAJWPEYBDXOG-UHFFFAOYSA-N 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 230000003197 catalytic effect Effects 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 13
- 230000001699 photocatalysis Effects 0.000 abstract description 11
- 230000005684 electric field Effects 0.000 abstract description 8
- 238000000926 separation method Methods 0.000 abstract description 8
- 238000004064 recycling Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 6
- 238000003786 synthesis reaction Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000009102 absorption Effects 0.000 description 15
- 238000004458 analytical method Methods 0.000 description 14
- 239000000047 product Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000002372 labelling Methods 0.000 description 7
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(III) oxide Inorganic materials O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 description 6
- 238000004090 dissolution Methods 0.000 description 6
- BMYNFMYTOJXKLE-UHFFFAOYSA-N 3-azaniumyl-2-hydroxypropanoate Chemical compound NCC(O)C(O)=O BMYNFMYTOJXKLE-UHFFFAOYSA-N 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 description 4
- 229940043267 rhodamine b Drugs 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical compound Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 238000007146 photocatalysis Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical group Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 241000219094 Vitaceae Species 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 235000021021 grapes Nutrition 0.000 description 2
- 238000010183 spectrum analysis Methods 0.000 description 2
- 238000002371 ultraviolet--visible spectrum Methods 0.000 description 2
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical group I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- CJJMLLCUQDSZIZ-UHFFFAOYSA-N oxobismuth Chemical compound [Bi]=O CJJMLLCUQDSZIZ-UHFFFAOYSA-N 0.000 description 1
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 1
- 238000006862 quantum yield reaction Methods 0.000 description 1
- 238000004627 transmission electron microscopy Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/06—Halogens; Compounds thereof
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- Chemical & Material Sciences (AREA)
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- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention belongs to field of nanometer material technology, disclose a kind of BiOX Bi4O5X2Hetero-junctions and its preparation method and application, wherein, one kind in X Cl, Br and I, the BiOX Bi4O5X2Hetero-junctions can form the separation that internal electric field is conducive to photo-generate electron-hole pair, and so as to have high catalytic performance, also, the preparation method is simple, not only overcomes scientific research problem, and synthesis step is simple, obtained BiOX Bi4O5X2Hetero-junctions morphology controllable, stability is preferable in photocatalytic process, and recycling rate of waterused is higher, has larger scientific research and application value.
Description
Technical field
The present invention relates to nano materials, and in particular, to a kind of BiOX-Bi4O5X2Hetero-junctions and preparation method thereof and should
With.
Background technology
Fossil fuel is all indispensable in the links that we live, and the non-renewable and reserves that gradually decrease are
Through causing energy crisis, and also along with serious environmental pollution during consumption.At present, Photocatalitic Technique of Semiconductor is considered
It is to solve the more promising technology of both of these problems.However, single semiconductor light-catalyst quantum efficiency it is low mainly due to its from
Some intrinsic defects of body, such as quick compound (short life), the photoresponse range of photo-generate electron-hole pair are limited, and lead to it
Photocatalytic activity is low.The experimental results show that it is maximally efficient raising semiconductor light-catalyst quantum to construct heterojunction structure
One of approach of efficiency.Semiconductor heterostructure ideally combines the advantages of different function semiconductor, not only widens
Hetero-junctions catalyst can be by optical range, and due to the difference of energy band, form energy level ladder in interface, be conducive to photoproduction
The quick separating of electron-hole pair and transmission, so as to improve the quantum yield of photochemical catalyst.BiOBr-Bi4O5Br2As bismuth system
A kind of important conductor photocatalysis material in compound, by bismuth oxygen layer [Bi2O2]2+With bis- [Br]-Sheath is handed over along c-axis direction
For unique layer structure is arranged to make up, this layer structure can be in [Bi2O2]2+Layer and [Br]-Internal electric field is formed between layer to be had
Conducive to the separation of photo-generate electron-hole pair, so as to high catalytic performance.At present, about BiOBr-Bi4O5Br2High quality circle
The synthesis of face hetero-junctions catalyst and photocatalysis performance is rare is reported.
Invention content
The object of the present invention is to provide a kind of BiOX-Bi4O5X2Hetero-junctions and its preparation method and application, the BiOX-
Bi4O5X2Hetero-junctions can form the separation that internal electric field is conducive to photo-generate electron-hole pair, so as to have high catalytic performance, and
And the preparation method is simple, obtained BiOX-Bi4O5X2Hetero-junctions morphology controllable, stability is preferable in photocatalytic process, weight
Multiple utilization rate is higher, has larger scientific research and application value.
To achieve these goals, the present invention provides a kind of BiOX-Bi4O5X2Hetero-junctions, the BiOX-Bi4O5X2It is different
Both include Bi in the X-ray diffractogram (XRD) of matter knot4O5X2Diffracted absorption peak, and the diffracted absorption peak including BiOX, and
Bi4O5X2The height at diffracted absorption peak be close with the height at the diffracted absorption peak of BiOX；Wherein, one in X Cl, Br and I
Kind.
The present invention also provides a kind of BiOX-Bi described previously4O5X2The preparation method of hetero-junctions, the preparation method include
Following steps：(1) Bi will be contained3+、X-Heating reaction is carried out with the aqueous solution of glucose；(2) by reaction product in 400-500 DEG C
Calcining；Wherein, Bi in aqueous solution3+、X-It is 1 with the ratio between the amount of substance of glucose：0.8-1.0：0.056-0.56；Wherein, X is
One kind in Cl, Br and I.
Moreover, the present invention also provides a kind of previously described BiOX-Bi4O5X2Hetero-junctions is in as photochemical catalyst
Application.
Through the above technical solutions, the present invention has filled up scientific research blank, a kind of BiOX-Bi is provided4O5X2Hetero-junctions and its
Preparation method and application, the BiOX-Bi4O5X2Hetero-junctions can form the separation that internal electric field is conducive to photo-generate electron-hole pair, from
And with high catalytic performance, also, the preparation method is simple, not only overcomes scientific research problem, and synthesis step is simple, obtains
BiOX-Bi4O5X2Hetero-junctions morphology controllable, stability is preferable in photocatalytic process, and recycling rate of waterused is higher, has larger
Scientific research and application value.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Description of the drawings
Attached drawing is to be used to provide further understanding of the present invention, and a part for constitution instruction, with following tool
Body embodiment is used to explain the present invention, but be not construed as limiting the invention together.In the accompanying drawings：
Fig. 1 is the X-ray diffractogram for detecting DS1-DS3 in example 1；
Fig. 2 is the X-ray diffractogram for detecting S1-S3 in example 1；
Fig. 3 is scanning electron microscope (SEM) analysis chart in detection example 2；
Fig. 4 is the detection and analysis figure detected in example 3, and a is tem analysis figure；B is HRTEM analysis charts；
Fig. 5 is ultraviolet-visible spectrum analysis chart in application examples 1；
Fig. 6 is ultraviolet-visible spectrum analysis chart in application examples 2；
Fig. 7 is X-ray diffractogram in application examples 2.
Specific embodiment
The specific embodiment of the present invention is described in detail below.It is it should be understood that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or
Value should be understood to comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively
It between the endpoint value of a range and individual point value and can be individually combined with each other between point value and obtain one or more
New numberical range, these numberical ranges should be considered as specific open herein.
The present invention provides a kind of BiOX-Bi4O5X2Hetero-junctions, the BiOX-Bi4O5X2The X-ray diffractogram of hetero-junctions
(XRD) both include Bi in4O5X2Diffracted absorption peak, and the diffracted absorption peak including BiOX, and Bi4O5X2Diffracted absorption peak
Height is close with the height at the diffracted absorption peak of BiOX；Wherein, one kind in X Cl, Br and I.
Through the above technical solutions, the present invention has filled up scientific research blank, a kind of BiOX-Bi is provided4O5X2Hetero-junctions, should
BiOX-Bi4O5X2Hetero-junctions can form the separation that internal electric field is conducive to photo-generate electron-hole pair, so as to high catalytic
Can, also, the preparation method is simple, not only overcomes scientific research problem, and synthesis step is simple, obtained BiOX-Bi4O5X2It is different
Matter knot morphology controllable, stability is preferable in photocatalytic process, and recycling rate of waterused is higher, has larger scientific research and application value.
Moreover, the BiOX-Bi4O5X2Hetero-junctions includes one-dimensional rod-like BiOX matrixes and is coupled in the BiOX bases
Bi on body4O5X2Nanometer sheet.
Further, BiOX-Bi4O5X2It is heterogeneous to become BiOBr-Bi4O5Br2Hetero-junctions, wherein, Bi4O5Br2Nanometer sheet
(110) crystal face for the BiOBr that interplanar distance is 0.277nm was not only included, but also including interplanar with the coupling intersection of BiOBr matrixes
Away from the Bi for 0.277nm4O5Br2(020) crystal face, and Bi4O5Br2(020) crystal face the direction of growth and (110) crystal face crystalline substance
Ruling extension direction approaches.
The present invention also provides a kind of BiOX-Bi described previously4O5X2The preparation method of hetero-junctions, the preparation method include
Following steps：(1) Bi will be contained3+、X-Heating reaction is carried out with the aqueous solution of glucose；(2) by reaction product in 400-500 DEG C
Calcining；Wherein, Bi in aqueous solution3+、X-It is 1 with the ratio between the amount of substance of glucose：0.8-1.0：0.056-0.56；Wherein, X is
One kind in Cl, Br and I.
Through the above technical solutions, the present invention has filled up scientific research blank, a kind of BiOX-Bi is provided4O5X2Hetero-junctions, should
BiOX-Bi4O5X2Hetero-junctions can form the separation that internal electric field is conducive to photo-generate electron-hole pair, so as to high catalytic
Can, also, the preparation method is simple, not only overcomes scientific research problem, and synthesis step is simple, obtained BiOX-Bi4O5X2It is different
Matter knot morphology controllable has larger scientific research and application value.
In a kind of more preferred embodiment of the present invention, the BiOX-Bi of morphology controllable in order to obtain4O5X2Hetero-junctions,
And further improve BiOX-Bi4O5X2The catalytic activity of hetero-junctions, it is preferable that Bi in aqueous solution3+A concentration of 0.01-
0.03mol/L。
In the above-mentioned technical solutions, as long as setting calcination temperature, for calcination time, those skilled in the art can compared with
It is adjusted in wide scope, in order to obtain the BiOX-Bi of morphology controllable4O5X2Hetero-junctions, and further improve BiOX-Bi4O5X2
The catalytic activity of hetero-junctions, it is preferable that calcination time 1.5-4h.
In a kind of more preferred embodiment of the present invention, the BiOX-Bi of morphology controllable in order to obtain4O5X2Hetero-junctions,
And further improve BiOX-Bi4O5X2The catalytic activity of hetero-junctions, it is preferable that the condition for heating reaction includes：Reaction temperature is
160-200 DEG C, reaction time 8-16h.
In a kind of more preferred embodiment of the present invention, the BiOX-Bi of morphology controllable in order to obtain4O5X2Hetero-junctions,
And further improve BiOX-Bi4O5X2The catalytic activity of hetero-junctions, it is preferable that the formation of the aqueous solution includes：Bi will be provided3+
Substance ultrasonic dissolution in provide X-Substance aqueous solution in, then add in glucose, ultrasonic disperse.
In a kind of more preferred embodiment of the present invention, the BiOX-Bi of morphology controllable in order to obtain4O5X2Hetero-junctions,
Impurity is reduced, and further improves BiOX-Bi4O5X2The catalytic activity of hetero-junctions, it is preferable that further include before calcination, by step
(1) the step of reaction product water and/or ethyl alcohol in are cleaned.
For providing Bi3+Substance, those skilled in the art can be selected in wider range, can be directly in water
It is middle to ionize to provide Bi3+, can also be by obtaining Bi with acid or other substance reactions3+, in a kind of more preferred reality of the present invention
It applies in mode, in order to obtain the BiOX-Bi of morphology controllable4O5X2Hetero-junctions, and further improve BiOX-Bi4O5X2Hetero-junctions
Catalytic activity, it is preferable that Bi is provided3+Substance include bismuth nitrate, bismuth oxalate and bismuth oxide in it is one or more.
For providing X-Substance, those skilled in the art can be selected in wider range, it is of the invention it is a kind of more
Add in preferred embodiment, in order to obtain the BiOX-Bi of morphology controllable4O5X2Hetero-junctions, and further improve BiOX-
Bi4O5X2The catalytic activity of hetero-junctions, it is preferable that X is provided-Substance to contain X--Salt or contain X-Acid, and, offer is provided
Bi3+Substance in contain bismuth oxide when, corresponding offer X-Substance to contain X-Acid.
Moreover, the present invention also provides a kind of previously described BiOX-Bi4O5X2Hetero-junctions is in as photochemical catalyst
Application.
BiOX-Bi4O5X2Hetero-junctions shows higher photocatalytic activity, and RhB is completely degraded in 10 minutes.We
Speculate, BiOX-Bi4O5X2Hetero-junctions can form internal electric field, be conducive to the separation of photo-generate electron-hole pair, so as to be urged with high
Change performance.Moreover, BiOX-Bi4O5X2Hetero-junctions stability in photocatalytic process is preferable, and recycling rate of waterused is higher.
The present invention will be described in detail by way of examples below.Reagent is conventional commercial products.
Embodiment 1
BiOBr-Bi4O5Br2The preparation method of hetero-junctions, the preparation method include the following steps：
(1) by 0.1g Bi2O3Then ultrasonic dissolution adds in 0.004g Portugals in 30ml 12mmol/L hydrobromic acid aqueous solutions
Grape sugar, ultrasonic disperse 60 minutes correspond to Bi in aqueous solution before reaction3+A concentration of 0.014mol/L, Br-It is a concentration of
12mmol/L, a concentration of 0.00074mol/L of glucose；
(2) by above-mentioned aqueous solution in 200 DEG C, 8h is reacted；
(3) reaction product water, ethyl alcohol are cleaned；
(4) reaction product after cleaning is calcined into 1.5h in 500 DEG C；Product labelling is DS1.
Embodiment 2
BiOBr-Bi4O5Br2The preparation method of hetero-junctions, the preparation method include the following steps：
(1) by 0.1g Bi2O3Then ultrasonic dissolution adds in 0.02g grapes in the aqueous solution of 30ml 12mmol/L HBr
Sugar, ultrasonic disperse 60 minutes, corresponds to Bi in aqueous solution before reaction3+A concentration of 0.014mol/L, Br-A concentration of 12mmol/
L, a concentration of 0.0037mol/L of glucose；
(2) by above-mentioned aqueous solution in 180 DEG C, 12h is reacted；
(3) reaction product water, ethyl alcohol are cleaned；
(4) reaction product after cleaning is calcined into 2h in 450 DEG C；Product labelling is DS2.
Embodiment 3
BiOBr-Bi4O5Br2The preparation method of hetero-junctions, the preparation method include the following steps：
(1) by 0.1g Bi2O3Then ultrasonic dissolution adds in 0.04g grapes in the aqueous solution of 30ml 12mmol/L HBr
Sugar, ultrasonic disperse 60 minutes, corresponds to Bi in aqueous solution before reaction3+A concentration of 0.014mol/L, Br-A concentration of 12mmol/
L, a concentration of 0.0074mol/L of glucose；
(2) by above-mentioned aqueous solution in 160 DEG C, 16h is reacted；
(3) reaction product water, ethyl alcohol are cleaned；
(4) reaction product after cleaning is calcined into 4h in 400 DEG C；Product labelling is DS3.
Embodiment 4
BiOBr-Bi4O5Br2The preparation method of hetero-junctions, the preparation method include the following steps：
(1) according to Bi in theoretically aqueous solution3+、Br-It is 1 with the ratio between the amount of substance of glucose：0.8：0.56, by 0.1g
Bi2O3Then ultrasonic dissolution adds in 0.04g glucose in the hydrobromic acid aqueous solution of 30mL 11mmol/L, ultrasonic disperse 60 divides
Clock corresponds to Bi in aqueous solution before reaction3+A concentration of 0.01mol/L；
(2) by above-mentioned aqueous solution in 200 DEG C, 8h is reacted；
(3) reaction product water, ethyl alcohol are cleaned；
(4) reaction product after cleaning is calcined into 1.5h in 500 DEG C.
Embodiment 5
BiOBr-Bi4O5Br2The preparation method of hetero-junctions, the preparation method include the following steps：
(1) according to Bi in theoretically aqueous solution3+、Br-It is 1 with the ratio between the amount of substance of glucose：1：0.056, by 0.3g
Bi2O3Then ultrasonic dissolution adds in 0.012g glucose in the hydrobromic acid aqueous solution of 30mL 42mmol/L, ultrasonic disperse 60 divides
Clock corresponds to Bi in aqueous solution before reaction3+A concentration of 0.03mol/L；
(2) by above-mentioned aqueous solution in 160 DEG C, 16h is reacted；
(3) reaction product water, ethyl alcohol are cleaned；
(4) reaction product after cleaning is calcined into 4h in 400 DEG C；Product labelling is DS3.
Embodiment 6
Hydrobromic acid aqueous solution is replaced with hydrochloric acid, and BiOCl-Bi is prepared according to by the method for embodiment 14O5Cl2Hetero-junctions.
Embodiment 7
Hydrobromic acid aqueous solution is replaced with hydriodic acid aqueous solution, and BiOI-Bi is prepared according to by the method for embodiment 14O5I2It is heterogeneous
Knot.
Comparative example 1
It is prepared by the method according to embodiment 1, unlike, not the step of calcining middle including step (4)；Product labelling
For S1.
Comparative example 2
It is prepared by the method according to embodiment 2, unlike, not the step of calcining middle including step (4)；Product labelling
For S2.
Comparative example 3
It is prepared by the method according to embodiment 3, unlike, not the step of calcining middle including step (4)；Product labelling
For S3.
Detect example 1
DS1-DS3 in X-ray diffraction analysis embodiment, and with standard card BiOBr and Bi4O5Br2Diffraction pattern carry out
Control, the result is shown in Figure 1, wherein, diffraction patterns of a for BiOBr standard cards, f Bi4O5Br2The diffraction pattern of standard card.
As seen from Figure 1, BiOBr-Bi4O5Br2Both include Bi in the X-ray diffractogram (XRD) of hetero-junctions4O5Br2Spread out
Penetrate absorption peak, and the diffracted absorption peak including BiOBr, and Bi4O5Br2The height at diffracted absorption peak and the diffracted absorption of BiOBr
The height at peak is close.
S1-S3 in X-ray diffraction analysis comparative example, and compareed with the diffraction pattern of standard card BiOBr and Bi, it ties
Fruit sees Fig. 2, wherein, a is the diffraction pattern of BiOBr standard cards, and e is the diffraction pattern of Bi standard cards.From Figure 2 it can be seen that comparative example
In S1-S3 not only diffracted absorption peaks containing BiOBr but also containing Bi diffracted absorptions peak, through with Bi in Fig. 14O5Br2Standard card
Diffraction pattern compares, it is found that Bi is not contained in S1-S34O5Br2Diffracted absorption peak.Illustrate that the S1-S3 in comparative example contains BiOBr
And Bi, and do not contain Bi4O5Br2。
Detect example 2
S1-S3 in scanning electron microscope (SEM) analysis embodiment in DS1-DS3 and comparative example, is as a result shown in Fig. 3, wherein, Fig. 3
In, a, c, e correspond to S1, S2, S3 respectively, and b, d, f correspond to DS1, DS2, DS3 respectively.As seen from Figure 3, after calcining, on BiOBr
There is more Bi4O5Br2Nanometer sheet.That is BiOBr-Bi4O5Br2Hetero-junctions includes one-dimensional rod-like BiOBr matrixes and is coupled in
Bi on the BiOBr matrixes4O5Br2Nanometer sheet
As a result, it is concluded that reaction mechanism is：First, Bi2O3Bi is released in being dissolved in HBr aqueous solutions3+, Bi3+
Under heating condition and water is combined into BiO+, BiO+And Br-Reaction generation BiOBr, glucose contain a certain amount of hydroxyl, glucose
Hydroxyl can interact with BiOBr, make BiOBr along [001] direction directional assembly be one-dimensional rod-like structure.With grape
Sugar amount increases, and the reproducibility enhancing of glucose restores a certain amount of Bi simple substance, in air high temperature from BiOBr
Calcining, you can generation BiOBr-Bi4O5Br2Hetero-junctions.
Similarly, the BiOBr-Bi obtained in scanning electron microscope (SEM) analysis embodiment 4, embodiment 54O5Br2Hetero-junctions, as a result
It is similar to the result in embodiment 1-3, occur more Bi after calcining, on BiOBr4O5Br2Nanometer sheet.
Similarly, the BiOCl-Bi obtained in scanning electron microscope (SEM) analysis embodiment 64O5Cl2Hetero-junctions, as a result with embodiment
Result in 1-3 is similar, occurs more Bi after calcining, on BiOCl4O5Cl2Nanometer sheet.
Similarly, the BiOI-Bi obtained in scanning electron microscope (SEM) analysis embodiment 74O5I 2Hetero-junctions, as a result with embodiment
Result in 1-3 is similar, occurs more Bi after calcining, on BiOI4O5I 2Nanometer sheet.
Detect example 3
DS2 is analyzed with transmission electron microscope (TEM), the results are shown in Figure 4.A is TEM (transmission electron microscopies in Fig. 4
Mirror) analysis chart, it is seen then that BiOX-Bi4O5X2Hetero-junctions includes one-dimensional rod-like BiOX matrixes and is coupled on the BiOX matrixes
Bi4O5X2Nanometer sheet.
The DS2 obtained with high-resolution transmission electron microscope (HRTEM) analysis embodiment 2, the results are shown in Figure 4, b in Fig. 4
For HRTEM analysis charts, it is seen that HRTEM analysis charts show clearly lattice fringe, Bi4O5Br2Nanometer sheet and BiOBr matrixes
It is not only 0.277nm's including (110) crystal face of BiOBr that interplanar distance is 0.277nm, but also including interplanar distance to couple intersection
Bi4O5Br2(020) crystal face, and Bi4O5Br2(020) crystal face the direction of growth and (110) crystal face lattice line extension direction
It is close.And Bi4O5Br2Almost along BiOBr lattice line epitaxial growths, strong chemical bond is generated between the two, is had larger
Coupling area, good Lattice Matching, show generation substance be BiOBr-Bi4O5Br2High quality interface hetero-junctions.
Application examples 1
In the case where temperature is 30 DEG C and illumination condition by DS2 0.04g with containing the water-soluble of RhB (rhodamine B) (20mg/L)
Liquid 40mL is contacted, and then carries out ultraviolet-visible light spectrum analysis.The results are shown in Figure 5, and DS2 samples show higher light
Catalytic activity, in 5 minutes RhB be completely degraded.As it can be seen that the BiOX-Bi of the present invention4O5X2There is hetero-junctions preferable light to urge
Change activity.
It is presumed that BiOX-Bi4O5X2Hetero-junctions can form internal electric field, be conducive to the separation of photo-generate electron-hole pair, from
And with high catalytic performance.
Application examples 2
According to the method for application examples 2, using 0.04g DS2 samples to 40mL 20mg/LRhB aqueous solutions photocatalytic degradations into
Row repeats degradation 6 times, then carries out ultraviolet-visible light spectrum analysis, the degradation efficiency after observation recycling, as a result such as Fig. 6 institutes
Show, the degradation efficiency of material is maintained at 95.3% after 6 cycles, it is seen then that BiOX-Bi4O5X2Hetero-junctions is steady in photocatalytic process
Qualitative preferable, recycling rate of waterused is higher.
Using diffraction patterns of the X-ray diffraction analysis DS2 before 6 cycles are carried out, after 6 cycles, the results are shown in Figure 7,
DS2 carry out 6 times cycle before, 6 times cycle after diffraction maximum change substantially it is small, it is seen then that BiOX-Bi4O5X2Hetero-junctions is followed in photocatalysis
After ring, the object of material does not change mutually, has good stability, recycling rate of waterused is higher.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail, within the scope of the technical concept of the present invention, a variety of simple variants can be carried out to technical scheme of the present invention, this
A little simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (10)
1. a kind of BiOX-Bi4O5X2Hetero-junctions, which is characterized in that the BiOX-Bi4O5X2The X-ray diffractogram of hetero-junctions
(XRD) both include Bi in4O5X2Diffracted absorption peak, and the diffracted absorption peak including BiOX, and Bi4O5X2Diffracted absorption peak
Height is close with the height at the diffracted absorption peak of BiOX；Wherein, one kind in X Cl, Br and I.
2. BiOX-Bi according to claim 14O5X2Hetero-junctions, wherein, the BiOX-Bi4O5X2Hetero-junctions includes one-dimensional
Rodlike BiOX matrixes and the Bi being coupled on the BiOX matrixes4O5X2Nanometer sheet.
3. BiOX-Bi according to claim 24O5X2Hetero-junctions, wherein, BiOX-Bi4O5X2It is heterogeneous to become BiOBr-
Bi4O5Br2Hetero-junctions, wherein, Bi4O5Br2Nanometer sheet and the coupling intersection of BiOBr matrixes be both including interplanar distance
(110) crystal face of the BiOBr of 0.277nm, and the Bi including interplanar distance for 0.277nm4O5Br2(020) crystal face, and
Bi4O5Br2The direction of growth of (020) crystal face approached with the lattice line extension direction of (110) crystal face.
4. a kind of claim 1-3 any one of them BiOX-Bi4O5X2The preparation method of hetero-junctions, which is characterized in that described
Preparation method includes the following steps：
(1) Bi will be contained3+、X-Heating reaction is carried out with the aqueous solution of glucose；
(2) by reaction product in 400-500 DEG C of calcining；
Wherein, Bi in aqueous solution3+、X-It is 1 with the ratio between the amount of substance of glucose：0.8-1.0：0.056-0.56；Wherein, X is
One kind in Cl, Br and I.
5. preparation method according to claim 4, wherein, Bi in aqueous solution3+A concentration of 0.01-0.03mol/L.
6. preparation method according to claim 4, wherein, calcination time 1.5-4h；
And/or it heats the condition of reaction and includes：Reaction temperature is 160-200 DEG C, reaction time 8-16h.
7. preparation method according to claim 4, wherein, the formation of the aqueous solution includes：Bi will be provided3+Substance surpass
Sound, which is dissolved in, provides X-Substance aqueous solution in, then add in glucose, ultrasonic disperse.
8. preparation method according to claim 4, wherein, it further includes before calcination, the reaction product in step (1) is used
The step of water and/or ethyl alcohol are cleaned.
9. preparation method according to claim 4, wherein, Bi is provided3+Substance include bismuth nitrate, bismuth oxalate and bismuth oxide
In it is one or more；And/or
X is provided-Substance to contain X--Salt or contain X-Acid, and, when provide Bi3+Substance in contain bismuth oxide when, it is right
The offer X answered-Substance to contain X-Acid.
10. according to claim 1-3 any one of them BiOX-Bi4O5X2Hetero-junctions is as the application in photochemical catalyst.
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