CN110280278A - A kind of iodine vacancy BiO1.2I0.6/Bi2O3Optic catalytic composite material and preparation method thereof - Google Patents
A kind of iodine vacancy BiO1.2I0.6/Bi2O3Optic catalytic composite material and preparation method thereof Download PDFInfo
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- CN110280278A CN110280278A CN201910486974.8A CN201910486974A CN110280278A CN 110280278 A CN110280278 A CN 110280278A CN 201910486974 A CN201910486974 A CN 201910486974A CN 110280278 A CN110280278 A CN 110280278A
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- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910052740 iodine Inorganic materials 0.000 title claims abstract description 43
- 239000011630 iodine Substances 0.000 title claims abstract description 43
- 239000002131 composite material Substances 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 230000003197 catalytic effect Effects 0.000 title abstract description 7
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(III) oxide Inorganic materials O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000012855 volatile organic compound Substances 0.000 claims abstract description 8
- 230000015556 catabolic process Effects 0.000 claims abstract description 7
- 238000006731 degradation reaction Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 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 8
- 239000000203 mixture Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 2
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims 1
- 229940049676 bismuth hydroxide Drugs 0.000 claims 1
- 239000007788 liquid Substances 0.000 claims 1
- 238000010792 warming Methods 0.000 claims 1
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 abstract description 33
- 230000001699 photocatalysis Effects 0.000 abstract description 11
- 238000000354 decomposition reaction Methods 0.000 abstract description 8
- 238000007146 photocatalysis Methods 0.000 abstract description 8
- 239000000356 contaminant Substances 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000002189 fluorescence spectrum Methods 0.000 abstract description 3
- 238000000746 purification Methods 0.000 abstract description 3
- 238000012512 characterization method Methods 0.000 abstract 1
- 229910000416 bismuth oxide Inorganic materials 0.000 description 30
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 description 30
- 230000000052 comparative effect Effects 0.000 description 12
- 238000000227 grinding Methods 0.000 description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- 229960000935 dehydrated alcohol Drugs 0.000 description 5
- 239000002957 persistent organic pollutant Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000000985 reflectance spectrum Methods 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 206010013786 Dry skin Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000003760 magnetic stirring Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000006263 metalation reaction Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/88—Handling or mounting catalysts
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- 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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- 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
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Abstract
The invention belongs to photocatalysis environmental contaminants purification techniques fields, and in particular to a kind of iodine vacancy BiO1.2I0.6/Bi2O3Optic catalytic composite material and preparation method thereof.To grind uniform iodine vacancy BiO1.2I0.6And Bi2O3Mixing material is placed in Muffle furnace as presoma, is heated to 350-550 DEG C, is calcined 2-6h, is obtained visible light-responded decomposition VOCs optic catalytic composite material BiO1.2I0.6/Bi2O3.Photocatalysis Decomposition typical case VOCs toluene is the results show that 2wt%BiO1.2I0.6/Bi2O3The efficiency of photocatalytic activity highest, degradation toluene is respectively BiO1.2I0.6And Bi2O31.1 and 1.2 times.Fluorescence spectrum characterization is the results show that its light induced electron and hole separative efficiency are apparently higher than BiO1.2I0.6And Bi2O3。
Description
Technical field
The invention belongs to photocatalysis environmental contaminants purification techniques field more particularly to a kind of iodine vacancy BiO1.2I0.6/
Bi2O3The preparation of optic catalytic composite material and its application in purifying VOCs.
Background technique
Photocatalysis technology degradation environmental contaminants, because being expected to using solar energy, reaction condition is mild, efficient, and is considered
It is a kind of feasible technology of green.However, lacking high-performance visible light catalyzing material greatly hinders this technology in reality
Application in popularization.
In recent years, researcher has found bismuth oxide (Bi2O3) degradation of organic pollutant is shown under light illumination it is higher
Activity.Bi2O3It is a kind of good material of visible absorption, forbidden band energy gap is about 2.8eV, and the absorbable wavelength of maximum is
The photon of 443nm.In addition, Bi2O3Valence band current potential be about 3.1V, valence-band level is deep, and Hole oxidation ability is strong, can will be most
Organic pollutant oxygenolysis.Although Bi2O3Light abstraction width is wider, Hole oxidation ability is strong, but Bi2O3Under light excitation
Electrons and holes separative efficiency is lower, its photocatalytic activity is caused not protrude.
Summary of the invention
In order to solve Bi2O3Light induced electron and hole low separation efficiency, it is difficult to the problem of efficient degradation organic pollutant, this
Invention utilizes iodine vacancy BiO1.2I0.6Modify Bi2O3, and the visible light catalytic composite material of deep decomposition VOCs a kind of is provided
BiO1.2I0.6/Bi2O3Preparation method.
A kind of optic catalytic composite material BiO of visible optical drive efficient-decomposition VOCs1.2I0.6/Bi2O3Preparation method, packet
Include following steps:
(1), the ethylene glycol solution of potassium iodide is instilled in the ethylene glycol solution of bismuth nitrate, is protected from light magnetic and is stirred to react 0.5-1h
Afterwards, mixed liquor is transferred to autoclave, in 140-180 DEG C of reaction 8-12h, cooled to room temperature is filtered, washed, 80 DEG C
BiOI is obtained after drying, wherein potassium iodide and the molar ratio of bismuth nitrate are 1:1；
(2), it weighs appropriate BiOI and is put into crucible, and place it in Muffle furnace, added with the heating rate of 5-10 DEG C/min
Heat roasts 2-6h to 350-550 DEG C, and cooled to room temperature obtains iodine vacancy BiO1.2I0.6。
(3), appropriate bismuth nitrate is weighed, is added in 2mol/L nitric acid and dissolves, a certain amount of hydrogen-oxygen is then added thereto
Change sodium, pH value of solution is adjusted to 8-9, then after 80 DEG C of magnetic are stirred to react 0.5h, is transferred to autoclave in 160-200 DEG C of reaction 8-
12h, cooled to room temperature obtain Bi after washing, drying2O3, wherein bismuth nitrate is 0.04 with sodium hydroxide molar ratio；
(4), according to iodine vacancy BiO1.2I0.6And Bi2O3Mass ratio is respectively 1.2%, 2.3%, 3.6%, 4.8%,
6.1%, by iodine vacancy BiO1.2I0.6And Bi2O3It is fully ground, with the iodine vacancy BiO after grinding1.2I0.6And Bi2O3Mixed powder
It as presoma, and places it in Muffle furnace, is heated to 350-550 DEG C with the heating rate of 5-10 DEG C/min, calcines 2-
6h, cooled to room temperature weighing, obtains visible light composite material 1wt%, 2wt%, 3wt%, 4wt%, 5wt% iodine vacancy
BiO1.2I0.6/Bi2O3。
Further, the reaction temperature of the step 1) is 160 DEG C, and the reaction time is 12h.
Further, the reaction temperature in the step 3) is 200 DEG C, time 10h.
Further, the maturing temperature in the step 4) is 400 DEG C, and calcining time is 5h, heating rate is 5 DEG C/
min。
The iodine vacancy BiO of above method preparation1.2I0.6/Bi2O3Composite material is degraded applied to VOCs.
Beneficial effect
Iodine vacancy BiO1.2I0.6It can effectively improve electrons relative migration rate, greatly inhibition electronics and hole
It is compound.Bi2O3Valence-band level is deep, and oxidisability is strong, it is seen that photocatalytic activity is high, by 2wt% iodine vacancy BiO1.2I0.6With Bi2O3It is multiple
It closes, under the driving of band edge potential difference, the separative efficiency of photo-generated carrier is significantly improved in system, photocatalysis Decomposition organic pollutant
Ability be remarkably reinforced.By the resulting iodine vacancy BiO of the present invention1.2I0.6/Bi2O3Applied to typical VOCs toluene purification in,
2wt%BiO1.2I0.6/Bi2O3The efficiency of photocatalysis Decomposition toluene is compared with iodine vacancy BiO1.2I0.6And Bi2O3It is significantly improved.And
The method of the present invention does not need to introduce other metal, and preparation method is simple, and cost is lower.
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.
Detailed description of the invention
Fig. 1 is BiO1.2I0.6、Bi2O3、BiO1.2I0.6/Bi2O3X-ray diffractogram；
Fig. 2 is BiO1.2I0.6、Bi2O3、BiO1.2I0.6/Bi2O3Ultraviolet-visible diffuse reflectance spectrum；
Fig. 3 is (a, b) BiO1.2I0.6、(c、d)Bi2O3, (e) 2wt%BiO1.2I0.6/Bi2O3Scanning electron microscope；
Fig. 4 is BiO1.2I0.6、Bi2O3、BiO1.2I0.6/Bi2O3Photocatalysis Decomposition toluene activity；
Fig. 5 is BiO1.2I0.6、Bi2O3, 2wt%BiO1.2I0.6/Bi2O3Fluorescence spectrum.
Specific embodiment
The present invention is described in further detail below with reference to embodiment:
Embodiment 1
Iodine vacancy BiO is prepared according to the method for comparative example 11.2I0.6；
Bi is prepared according to the method for comparative example 22O3；
Weigh 0.023g iodine vacancy BiO1.2I0.6And 0.98gBi2O3, the dehydrated alcohol of 4mL is added after the two is mixed, grinds
After grinding 0.5h, 0.5h is regrind after 100 DEG C of dry 1h, the mixture after grinding is put into Muffle furnace, with the liter of 5 DEG C/min
Warm rate is heated to 400 DEG C, roasts 5h, and cooled to room temperature obtains 2wt%BiO1.2I0.6/Bi2O3。
Embodiment 2
Iodine vacancy BiO is prepared according to the method for comparative example 11.2I0.6；
Bi is prepared according to the method for comparative example 22O3；
Weigh 0.012g iodine vacancy BiO1.2I0.6And 0.99gBi2O3, the dehydrated alcohol of 4mL is added after the two is mixed, grinds
After grinding 0.5h, 0.5h is regrind after 100 DEG C of dry 1h, the mixture after grinding is put into Muffle furnace, with the liter of 5 DEG C/min
Warm rate is heated to 400 DEG C, roasts 5h, and cooled to room temperature obtains 1wt%BiO1.2I0.6/Bi2O3。
Embodiment 3
Iodine vacancy BiO is prepared according to the method for comparative example 11.2I0.6；
Bi is prepared according to the method for comparative example 22O3；
Weigh 0.035g iodine vacancy BiO1.2I0.6And 0.97gBi2O3, the dehydrated alcohol of 4mL is added after the two is mixed, grinds
After grinding 0.5h, 0.5h is regrind after 100 DEG C of dry 1h, the mixture after grinding is put into Muffle furnace, with the liter of 5 DEG C/min
Warm rate is heated to 400 DEG C, roasts 5h, and cooled to room temperature obtains 3wt%BiO1.2I0.6/Bi2O3。
Embodiment 4
Iodine vacancy BiO is prepared according to the method for comparative example 11.2I0.6；
Bi is prepared according to the method for comparative example 22O3；
Weigh 0.046g iodine vacancy BiO1.2I0.6And 0.96gBi2O3, the dehydrated alcohol of 4mL is added after the two is mixed, grinds
After grinding 0.5h, 0.5h is regrind after 100 DEG C of dry 1h, the mixture after grinding is put into Muffle furnace, with the liter of 5 DEG C/min
Warm rate is heated to 400 DEG C, roasts 5h, and cooled to room temperature obtains 4wt%BiO1.2I0.6/Bi2O3。
Embodiment 5
Iodine vacancy BiO is prepared according to the method for comparative example 11.2I0.6；
Bi is prepared according to the method for comparative example 22O3；
Weigh 0.058g iodine vacancy BiO1.2I0.6And 0.95gBi2O3, the dehydrated alcohol of 4mL is added after the two is mixed, grinds
After grinding 0.5h, 0.5h is regrind after 100 DEG C of dry 1h, the mixture after grinding is put into Muffle furnace, with the liter of 5 DEG C/min
Warm rate is heated to 400 DEG C, roasts 5h, and cooled to room temperature obtains 5wt%BiO1.2I0.6/Bi2O3。
Comparative example 1
Ethylene glycol solution by 40mL containing 1.9gKI instills 40mL (NO containing 5.5gBi3)3·5H2In the ethylene glycol solution of O,
It is protected from light magnetic and is stirred to react 0.5h.Mixed liquor is transferred to 100mL autoclave to be placed in baking oven, 160 DEG C of reaction 12h.It is natural
It is cooled to room temperature, sample is filtered, washed, obtains BiOI after 80 DEG C of dryings.It weighs 1gBiOI and is put into crucible, in Muffle furnace,
400 DEG C are heated to the heating rate of 5 DEG C/min, roasts 5h, cooled to room temperature obtains iodine vacancy BiO1.2I0.6。
Comparative example 2
1.94g bismuth nitrate is weighed, 50mL, 2mol/L HNO is added3Then 4.5g hydroxide is added in dissolution thereto again
Sodium, magnetic stirring and dissolving then use the HNO of 2mol/L3Or pH value of solution is adjusted to 8-9 by NaOH, is then stirred to react in 80 DEG C of magnetic
After 0.5h, autoclave is transferred in 160-200 DEG C of reaction 8-12h, cooled to room temperature obtains Bi after washing, drying2O3。
Fig. 1 is BiO1.2I0.6、Bi2O3、BiO1.2I0.6/Bi2O3X-ray diffractogram.From fig. 1, it can be seen that the BiOI of tetragonal phase
Diffraction maximum and Bi after 400 DEG C, roasting 5h2O3It is not consistent, it is weightless by roasting front and back it is found that being changed into after BiOI calcining
Iodine vacancy BiO1.2I0.6, this shows that BiOI is calcined under the above conditions and is not changed into Bi2O3。Bi2O3Diffraction maximum and its monocline
Consistent (PDF#41-1449).For 1wt%, 3wt%, 4wt%, 5wt%BiO1.2I0.6/Bi2O3Composite material, with
BiO1.2I0.6Content increases, BiO1.2I0.6Characteristic peak gradually increase, Bi2O3Diffraction maximum is gradually reduced.It is worth noting that
2wt%BiO1.2I0.6/Bi2O3It is greater than 3wt% and 4wt%BiO in 30.6 ° of diffraction peak intensities1.2I0.6/Bi2O3, this may be to close
Suitable BiO1.2I0.6With Bi2O3It is compound to cause to belong to BiO1.2I0.6Crystal face peak dominant growth.
Fig. 2 is BiO1.2I0.6、Bi2O3、BiO1.2I0.6/Bi2O3Ultraviolet-visible diffuse reflectance spectrum.Iodine is empty as shown in Figure 2
Position BiO1.2I0.6Light abstraction width is wider, maximum absorption wave a length of 500nm, Bi2O3It is also a kind of good material of light abstraction width
Material, being capable of photon of the absorbing wavelength less than 460nm.BiO1.2I0.6/Bi2O3Maximum light absorption range is between 460-500nm, card
Real BiO1.2I0.6/Bi2O3It is a kind of composite material with good visible absorption.
Fig. 3 is (a, b) BiO1.2I0.6、(c、d)Bi2O3, (e) 2wt%BiO1.2I0.6/Bi2O3Scanning electron microscope.It can by Fig. 3
To find out BiO1.2I0.6In flower ball-shaped, microballoon average diameter is about 2 μm, Bi2O3For rodlike external form, average length and width difference
About 10 μm and 2 μm.From 2wt%BiO1.2I0.6/Bi2O3Electron microscope is it is clear that Bi2O3It is immobilized on BiO1.2I0.6Surface,
And it is well dispersed.Scanning electron microscope result confirms BiO1.2I0.6And Bi2O3It is tightly combined.
Fig. 4 is BiO1.2I0.6、Bi2O3、BiO1.2I0.6/Bi2O3The active result of photocatalysis Decomposition toluene.Quartz reaction
Device volume is 250mL, 300W xenon lamp as light source, each catalyst amount 0.1g, toluene initial concentration 2800mg m-3、H2O
50μL.As seen from Figure 4, toluene concentration is gradually reduced with the extension of light application time, wherein 2wt%BiO1.2I0.6/Bi2O3It is aobvious
Highest photocatalytic activity is shown.It is irradiated by 8h, BiO1.2I0.6By 82.3% degradation of toluene, Bi2O3Degrade 76.3%
Toluene, and under identical condition, 1wt% BiO1.2I0.6/Bi2O3, 2wt%BiO1.2I0.6/Bi2O3, 3wt%BiO1.2I0.6/
Bi2O3, 4wt%BiO1.2I0.6/Bi2O3, 5wt%BiO1.2I0.6/Bi2O3Respectively by 75.1%, 91%, 84.3%, 81.5,
76.1% degradation of toluene.
Fig. 5 is BiO1.2I0.6、Bi2O3, 2wt%BiO1.2I0.6/Bi2O3Fluorescence spectrum.As shown in Figure 5, in 400nm wave
Under long light excitation, BiO1.2I0.6、Bi2O3And 2wt%BiO1.2I0.6/Bi2O3The size of fluorescence intensity is Bi2O3〉BiO1.2I0.6〉
2wt%BiO1.2I0.6/Bi2O3, this shows Bi2O3、BiO1.2I0.6And 2wt%BiO1.2I0.6/Bi2O3Middle light induced electron and hole
Separative efficiency size is Bi2O3<BiO1.2I0.6< 2wt%BiO1.2I0.6/Bi2O3, to confirm 2wt%BiO1.2I0.6With Bi2O3It is multiple
Close the separative efficiency that can significantly improve carrier.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (7)
1. a kind of iodine vacancy BiO1.2I0.6/Bi2O3The preparation method of composite material, which is characterized in that the preparation method step is such as
Under:
To grind uniform iodine vacancy BiO1.2I0.6And Bi2O3Mixing material as presoma, and place it in Muffle furnace,
It is warming up to 350-550 DEG C with the rate of heat addition of 5-10 DEG C/min, calcines 2-6h, cooled to room temperature weighing obtains iodine vacancy
BiO1.2I0.6/Bi2O3Composite material.
2. iodine vacancy BiO as described in claim 11.2I0.6/Bi2O3The preparation method of composite material, which is characterized in that described
Iodine vacancy BiO1.2I0.6The preparation method comprises the following steps:
(1), the ethylene glycol solution of potassium iodide is instilled in the ethylene glycol solution of bismuth nitrate, is protected from light after magnetic is stirred to react 0.5-1h,
Mixed liquor is transferred to autoclave, 140-180 DEG C of reaction 8-12h, cooled to room temperature is filtered, washed, after 80 DEG C of drying
Obtain BiOI；
(2), it weighs BiOI and is put into crucible, and place it in Muffle furnace, 350- is heated to the heating rate of 5-10 DEG C/min
550 DEG C, 2-6h is roasted, cooled to room temperature obtains iodine vacancy BiO1.2I0.6。
3. iodine vacancy BiO as described in claim 11.2I0.6/Bi2O3The preparation method of composite material, which is characterized in that described
Bi2O3The preparation method comprises the following steps: weigh bismuth nitrate, be added in 2mol/L nitric acid and dissolve, sodium hydroxide is then added thereto, it is molten
Liquid pH is adjusted to 8-9, then after 80 DEG C of magnetic are stirred to react 0.5h, is transferred to autoclave in 160-200 DEG C of reaction 8-12h, certainly
So be cooled to room temperature, wash, dry after obtain Bi2O3。
4. iodine vacancy BiO as claimed in claim 21.2I0.6/Bi2O3The preparation method of composite material, which is characterized in that step
(1) potassium iodide and the molar ratio of bismuth nitrate are 1:1.
5. iodine vacancy BiO as claimed in claim 31.2I0.6/Bi2O3The preparation method of composite material, which is characterized in that nitric acid
The molar ratio of bismuth and sodium hydroxide is 0.04.
6. a kind of iodine vacancy BiO of method preparation as described in claim 11.2I0.6/Bi2O3Composite material, which is characterized in that institute
Composite material is stated by iodine vacancy BiO1.2I0.6And Bi2O3Composition, wherein iodine vacancy BiO1.2I0.6In iodine vacancy BiO1.2I0.6/
Bi2O3In mass content be 1-5wt%.
7. a kind of iodine vacancy BiO of method preparation as described in claim 11.2I0.6/Bi2O3Composite material is in VOCs degradation
Using.
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