CN105728011A - Bi12TiO20/g-C3N4 composite visible-light-driven photocatalyst with tetrahedron morphology and preparation method thereof - Google Patents
Bi12TiO20/g-C3N4 composite visible-light-driven photocatalyst with tetrahedron morphology and preparation method thereof Download PDFInfo
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- 229910002116 Bi12TiO20 Inorganic materials 0.000 title claims abstract description 36
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000002131 composite material Substances 0.000 title claims abstract description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 18
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000000243 solution Substances 0.000 claims abstract description 9
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 6
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 6
- 229910000416 bismuth oxide Inorganic materials 0.000 claims abstract description 5
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000003054 catalyst Substances 0.000 claims description 31
- 150000001875 compounds Chemical class 0.000 claims description 16
- 239000000725 suspension Substances 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000012670 alkaline solution Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 2
- 230000004044 response Effects 0.000 claims description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 abstract description 36
- 230000000694 effects Effects 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000010335 hydrothermal treatment Methods 0.000 abstract description 4
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 abstract description 2
- 238000006731 degradation reaction Methods 0.000 abstract description 2
- 238000013329 compounding Methods 0.000 abstract 1
- 239000011259 mixed solution Substances 0.000 abstract 1
- 230000003647 oxidation Effects 0.000 description 10
- 238000007254 oxidation reaction Methods 0.000 description 10
- 230000003197 catalytic effect Effects 0.000 description 9
- 238000006555 catalytic reaction Methods 0.000 description 8
- 239000000356 contaminant Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 6
- 238000013019 agitation Methods 0.000 description 5
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 5
- 230000001699 photocatalysis Effects 0.000 description 5
- 238000007146 photocatalysis Methods 0.000 description 5
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 230000001808 coupling effect Effects 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910052692 Dysprosium Inorganic materials 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 229960000935 dehydrated alcohol Drugs 0.000 description 3
- KBQHZAAAGSGFKK-UHFFFAOYSA-N dysprosium atom Chemical compound [Dy] KBQHZAAAGSGFKK-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- -1 polyparaphenylene phenol Polymers 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052797 bismuth Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910003080 TiO4 Inorganic materials 0.000 description 1
- UELITFHSCLAHKR-UHFFFAOYSA-N acibenzolar-S-methyl Chemical compound CSC(=O)C1=CC=CC2=C1SN=N2 UELITFHSCLAHKR-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 1
- 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 1
- 229940043267 rhodamine b Drugs 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 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
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/24—Nitrogen compounds
-
- 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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- 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
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/70—Non-metallic catalysts, additives or dopants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/80—Type of catalytic reaction
- B01D2255/802—Photocatalytic
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- Environmental & Geological Engineering (AREA)
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- Health & Medical Sciences (AREA)
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Abstract
The invention belongs to the field of photocatalysts, and particularly relates to a Bi12TiO20/g-C3N4 composite visible-light-driven photocatalyst with tetrahedron morphology and a preparation method thereof.The preparation method comprises the steps that bismuth oxide and titanium dioxide are dissolved in a sodium hydroxide solution, and the mixed solution is placed in a constant-temperature environment for hydro-thermal treatment reacting; after the obtained product is washed and dried, the Bi12TiO20 photocatalyst with the tetrahedron morphology is obtained; the Bi12TiO20 photocatalyst with the tetrahedron morphology and g-C3N4 are subjected to ultrasonic compounding, and the composite visible-light-driven photocatalyst Bi12TiO20/g-C3N4 is obtained.According to the method, a preparation process of adopting a hydrothermal method firstly and adopting an ultrasonic method later is adopted for preparing the composite visible-light-driven photocatalyst Bi12TiO20/g-C3N4 with the tetrahedron morphology, the advantages of being easy to operate, safe, low in cost and the like are achieved, and a good degradation effect is achieved on gaseous pollutant formaldehyde.
Description
Technical field
The invention belongs to photocatalyst field, be specifically related to a kind of tetrahedron pattern Bi12TiO20/g-C3N4Composite visible light is catalyzed
Agent and preparation method thereof.
Background technology
Photocatalysis technology is the spy utilizing semiconductor catalyst to be stimulated under light illumination, activating generation photohole and light induced electron
Property, makes a return journey the pollutant in division ring border with the oxidisability of photohole, the reproducibility of light induced electron.It is because energy consumption is low, salinity
The advantages such as high, reaction condition is gentle, have been considered as removing a kind of effective ways of hardly degraded organic substance, at present in environmental improvement
Aspect has broad application prospects.Therefore, seek cheap, environmental friendliness and there is the photocatalyst of visible light catalysis activity be
The key that photocatalysis orientation direction is practical.In recent years, cubic system sillenite material Bi12TiO20Because there is TiO4On four sides
Body and the special structure of BiOn polyhedron and there is a large amount of Lacking oxygen and ionic vacancies, and then the optical property possessing uniqueness enjoys
Pay close attention to.
Additionally, going deep into along with research, the pattern of photocatalyst crystals, crystal face energy, crystal face hetero-junctions and crystal face coupling effect etc.
Also it is the key factor affecting light-catalyzed reaction activity.Therefore, research has special appearance and has the compound of crystal face coupling effect
Type photocatalyst has very important meaning.Liqun Ye etc. utilizes chemical baths to synthesize to have the compound of crystal face coupling effect
Catalyst BiOBr/g-C3N4, its photochemical catalytic oxidation rhodamine B performance notable (Ye, L.；Liu,J.；Jiang,Z.；Peng,T.；Zan,
L.Applied Catalysis B:Environmental 2013,142-143).So far, answer for having tetrahedron pattern
Mould assembly catalyst Bi12TiO20/g-C3N4Research there is not been reported.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, it is therefore intended that provide a kind of tetrahedron pattern Bi12TiO20/g-C3N4Compound visible
Photocatalyst and preparation method thereof.
For achieving the above object, the technical solution used in the present invention is:
A kind of tetrahedron pattern Bi12TiO20/g-C3N4The preparation method of composite visible light catalyst, comprises the steps:
(1) bismuth oxide and titanium dioxide that mol ratio is 6:1 are dissolved in alkaline solution, continuously stirred after obtain yellow green hang
Turbid liquid；
(2) yellow green suspension is transferred in reactor, carries out hydro-thermal reaction process, after reaction terminates, be cooled to room temperature；
(3) step (2) gained product is washed, dried, obtain the Bi of the tetrahedron pattern of yellow12TiO20Light
Catalyst；
(4) by step (3) gained Bi12TiO20Photocatalyst and g-C3N4It is mixed in necessarily according to mass ratio 50:1～4
In amount pure water, after ULTRASONIC COMPLEX, freeze-day with constant temperature, obtain the compound visible light catalyst Bi of tetrahedron pattern12TiO20/g-C3N4。
In such scheme, described alkaline solution is sodium hydroxide solution.
In such scheme, the reaction temperature of step (2) described hydro-thermal reaction is 180 DEG C～230 DEG C, and the response time is 0.5h～24h.
In such scheme, the described dry temperature of step (3) is 70 DEG C～80 DEG C, and the time being dried is 4h～10h.
In such scheme, the supersonic frequency of step (4) described ULTRASONIC COMPLEX is 59KHz, and ultrasonic time is 6h.
In such scheme, the temperature of step (4) described freeze-day with constant temperature is 70 DEG C.
In such scheme, step (1) described stirring is magnetic agitation, and the time of described magnetic agitation is 10min～30min.
Beneficial effects of the present invention is as follows: the tetrahedron pattern Bi that (1) present invention is obtained12TiO20/g-C3N4Composite visible light
Catalyst has the advantage that catalysis activity is high, catalysis oxidation efficiency is high, has good degraded effect especially to gaseous contaminant formaldehyde
Really, have a good application prospect in photocatalysis field；(2) after the present invention uses first hydro-thermal method prepared by the preparation technology of ultrasonic method
Obtain tetrahedron pattern Bi12TiO20/g-C3N4Composite visible light catalyst, preparation method has simple to operate, safety, cost
The advantage such as cheap.
Accompanying drawing illustrates:
Fig. 1 is obtained Bi12TiO20/g-C3N4The XRD spectra of compound visible light catalyst, curve a in Fig. 1, b,
C, d and e are respectively pure Bi12TiO20, embodiment 1 sample, embodiment 2 sample, embodiment 3 sample and pure g-C3N4Sample
The XRD spectra of product.
Fig. 2 is obtained Bi12TiO20/g-C3N4The XPS collection of illustrative plates of compound visible light catalyst, in figure, spectrogram a correspondence is real
Execute the sample obtained by example 2.
Fig. 3 is obtained pure Bi12TiO20And Bi12TiO20/g-C3N4The SEM photograph of compound visible light catalyst, Fig. 3
Middle a and b corresponds to pure Bi12TiO20, c and d be corresponding to sample obtained by embodiment 2.
Fig. 4 is obtained Bi12TiO20/g-C3N4The compound visible light catalyst catalytic oxidation effect figure to gaseous formaldehyde,
In Fig. 4, a, b, c, d, e and f are respectively gaseous formaldehyde without catalyst (blank experiment), pure Bi12TiO20, pure g-C3N4、
Photochemical catalytic oxidation effect curve under embodiment 3 sample, embodiment 1 sample and embodiment 2 sample condition.
Detailed description of the invention
In order to be more fully understood that the present invention, it is further elucidated with present disclosure below in conjunction with embodiment, but present disclosure is not
It is limited only to the following examples.
Embodiment 1
A kind of tetrahedron pattern Bi12TiO20/g-C3N4Composite visible light catalyst, is prepared via a method which to obtain:
(1) under the conditions of room temperature (room temperature pointed out in present patent application is about 25 DEG C) and magnetic agitation, by 6mmol oxygen
Change bismuth and 1mmol titanium dioxide is dissolved in the 4mol/L sodium hydroxide solution of 60mL, obtain yellow green suspension；
(2) above-mentioned yellow green suspension is transferred in the stainless steel cauldron that liner is polyparaphenylene phenol of 100mL, will not
Rust steel reactor is placed in constant temperature oven in 220 DEG C of hydrothermal treatment consists 0.5h, and reaction naturally cools to room temperature after terminating to take out；
(3) at the constant temperature of 70 DEG C after the centrifugal washing respectively of product pure water step (2) obtained and dehydrated alcohol 3 times
Under be dried 5h, obtain the Bi of a small amount of tetrahedron pattern12TiO20Photocatalyst；
(4) 0.5g step (3) products therefrom Bi is weighed respectively according to mass ratio 50:112TiO20Photocatalyst and 0.01g graphite
Ene-type nitrogen carbide, both are mixed in a certain amount of pure water, ULTRASONIC COMPLEX 6h under 59KHz frequency, after at the constant temperature bar of 70 DEG C
It is dried 5h under part, obtains the compound visible light catalyst Bi of tetrahedron pattern12TiO20/g-C3N4(it is labeled as 0.5:0.01
Bi12TiO20/g-C3N4)。
The XRD spectra of the obtained product of the present embodiment is shown in Fig. 1 b, its diffraction maximum position and cubic structure Bi12TiO20(JCPDS
Base peak position consistency 34-0097), it was demonstrated that containing Bi in synthesized composite sample12TiO20Thing phase；But g-C3N4's
XRD diffraction maximum is not apparent from detection to be occurred, one is due to g-C in sample3N4Content is few, degree of crystallinity is relatively low；Two is due to two things
Phase peak position is close, is difficult to differentiate.But in Fig. 2, XPS test result shows that N element is present in sample, therefore sample
Middle existence phase g-C3N4。
Obtained for this example product is used for photochemical catalytic oxidation gaseous contaminant formaldehyde, and catalyst amounts is 0.5g, and formaldehyde is injected
Amount is 0.5 μ L, closed reactor volume 600mL (formaldehyde theoretical concentration value is 0.8 μ L/L), after reaching adsorption equilibrium, opens
Visible light source is degraded.Experiment uses 300W dysprosium lamp as light source, irradiate the wavelength X >=400nm of light.In identical reality
Under the conditions of testing, use g-C respectively3N4And Bi12TiO20With compound visible light catalyst Bi12TiO20/g-C3N4Make photocatalytic degradation
Contrast test, experimental result is as shown in Figure 4.After light-catalyzed reaction 7h, the catalyst that the present embodiment prepares is to gaseous contaminant
The photochemical catalytic oxidation efficiency of formaldehyde is about 69% (Fig. 4 e).
Embodiment 2
A kind of tetrahedron pattern Bi12TiO20/g-C3N4Composite visible light catalyst, is prepared via a method which to obtain:
(1) under the conditions of room temperature (25 DEG C) and magnetic agitation, 6mmol bismuth oxide and 1mmol titanium dioxide are dissolved in 60mL
4mol/L sodium hydroxide solution in, obtain yellow green suspension；
(2) above-mentioned yellow green suspension is transferred in the stainless steel cauldron that liner is polyparaphenylene phenol of 100mL, will not
Rust steel reactor naturally cools to room temperature as in constant temperature oven after 220 DEG C of hydrothermal treatment consists 0.5h, reaction end taking-up；
(3) at the constant temperature bar of 70 DEG C after the centrifugal washing respectively of product pure water step (2) obtained and dehydrated alcohol 3 times
It is dried 5h under part, obtains the Bi of a small amount of tetrahedron pattern12TiO20Photocatalyst；
(4) 0.5g step (3) products therefrom Bi is weighed respectively according to mass ratio 50:212TiO20Photocatalyst and 0.02g graphite
Ene-type nitrogen carbide, is mixed in a certain amount of pure water, ULTRASONIC COMPLEX 6h under 59KHz frequency, after at the constant temperature bar of 70 DEG C
It is dried 5h under part, obtains the compound visible light catalyst Bi of tetrahedron pattern12TiO20/g-C3N4(it is labeled as 0.5:0.02
Bi12TiO20/g-C3N4)。
The XRD spectra of the obtained sample of the present embodiment is shown in Fig. 1 c, analyzes with embodiment 1.The XPS of the obtained sample of the present embodiment
Collection of illustrative plates is shown in that Fig. 2, Fig. 2 illustrate that the obtained sample of the present embodiment is made up of Bi, Ti, O, C and N element, shows compound sample
Middle there is Bi simultaneously12TiO20Thing phase and g-C3N4Thing phase.Fig. 3 c and 3d shows that the SEM of the obtained sample of the present embodiment shines
Sheet.Pure Bi is can be seen that from Fig. 3 a and 3b12TiO20Tetrahedral faces is smooth, but compound g-C3N4After, tetrahedral table
, there is many elongated gullies (Fig. 3 c and 3d) in face out-of-flatness.Fig. 3 shows, ultrasonic procedure makes g-C3N4Successful deposition in
Bi12TiO20Surface.
Obtained for this example product is used for photochemical catalytic oxidation gaseous contaminant formaldehyde, and catalyst amounts is 0.5g, and formaldehyde is injected
Amount is 0.5 μ L, closed reactor volume 600mL (formaldehyde theoretical concentration value is 0.8 μ L/L), after reaching adsorption equilibrium, opens
Visible light source is degraded.Experiment uses 300W dysprosium lamp as light source, irradiate the wavelength X >=400nm of light.Photocatalysis is dropped
Solution experiment shows, after light-catalyzed reaction 7h, the photochemical catalytic oxidation of gaseous contaminant formaldehyde is imitated by the catalyst that the present embodiment prepares
Rate is about 75% (Fig. 4 f), higher than pure g-C3N4, pure Bi12TiO20, in embodiment 1 and embodiment 3 photocatalyst to gas
The degradation rate of state Pollutant Formaldehyde, reason is g-C in compound visible light catalyst3N4Content is moderate and defines surface coupling
Effect, beneficially light induced electron and hole are at g-C3N4With Bi12TiO20Shift between two thing phase surfaces, improve light induced electron
Separation probability with hole.
Embodiment 3
A kind of tetrahedron pattern Bi12TiO20/g-C3N4Composite visible light catalyst, is prepared via a method which to obtain:
(1) under the conditions of room temperature (25 DEG C) and magnetic agitation, 6mmol bismuth oxide and 1mmol titanium dioxide are dissolved in 60mL
4mol/L sodium hydroxide solution in, obtain yellow green suspension；
(2) yellow green suspension obtained above is transferred in the stainless steel cauldron that liner is polyparaphenylene phenol of 100mL,
Stainless steel cauldron is naturally cooled to room temperature as in constant temperature oven after 220 DEG C of hydrothermal treatment consists 0.5h, reaction end taking-up；
(3) at the constant temperature bar of 70 DEG C after product pure water step (2) obtained and dehydrated alcohol centrifuge washing 3 times respectively
It is dried 5h under part, obtains the Bi of a small amount of tetrahedron pattern12TiO20Photocatalyst；
(4) 0.5g step (3) products therefrom Bi is weighed respectively according to mass ratio 50:412TiO20Photocatalyst and 0.04g stone
Both are mixed in a certain amount of pure water, ULTRASONIC COMPLEX 6h under 59KHz frequency by ink ene-type nitrogen carbide, after the perseverance of 70 DEG C
It is dried 5h under the conditions of temperature, obtains the compound visible light catalyst Bi of tetrahedron pattern12TiO20/g-C3N4(it is labeled as 0.5:0.04
Bi12TiO20/g-C3N4)。
Obtained for this example product is used for photochemical catalytic oxidation gaseous contaminant formaldehyde, and catalyst amounts is 0.5g, and formaldehyde is injected
Amount is 0.5 μ L, closed reactor volume 600mL (formaldehyde theoretical concentration value is 0.8 μ L/L), after reaching adsorption equilibrium, opens
Visible light source is degraded.Experiment uses 300W dysprosium lamp as light source, irradiate the wavelength X >=400nm of light.Photocatalysis is dropped
Solution experiment shows, after light-catalyzed reaction 7h, the compound visible light catalyst that this embodiment prepares is to gaseous contaminant formaldehyde
Photochemical catalytic oxidation efficiency is about 60% (Fig. 4 d).
Obviously, above-described embodiment is only by clearly demonstrating made example, and not restriction to embodiment.For institute
For the those of ordinary skill in genus field, can also make other changes in different forms on the basis of the above description.
Here without also cannot all of embodiment be given exhaustive.And the obvious change therefore amplified or variation still in
Within the protection domain of the invention.
Claims (7)
1. a tetrahedron pattern Bi12TiO20/g-C3N4The preparation method of composite visible light catalyst, it is characterised in that comprise the steps:
(1) bismuth oxide and titanium dioxide that mol ratio is 6:1 are dissolved in alkaline solution, continuously stirred after obtain yellow green suspension；
(2) yellow green suspension is transferred in reactor, carries out hydro-thermal reaction process, after reaction terminates, be cooled to room temperature；
(3) step (2) gained product is washed, dried, obtain the Bi of the tetrahedron pattern of yellow12TiO20Photocatalyst；
(4) by step (3) gained Bi12TiO20Photocatalyst and g-C3N4It is mixed in a certain amount of pure water according to mass ratio 50:1～4, after ULTRASONIC COMPLEX, freeze-day with constant temperature, obtains the compound visible light catalyst Bi of tetrahedron pattern12TiO20/g-C3N4。
Preparation method the most according to claim 1, it is characterised in that step (1) described alkaline solution is sodium hydroxide solution.
Preparation method the most according to claim 1, it is characterised in that the reaction temperature of step (2) described hydro-thermal reaction is 180 DEG C ~ 230 DEG C, and the response time is 0.5h ~ 24h.
Preparation method the most according to claim 1, it is characterised in that the supersonic frequency of step (4) described ULTRASONIC COMPLEX is 59KHz, ultrasonic time is 6h.
Preparation method the most according to claim 1, it is characterised in that the described dry temperature of step (3) is 70 DEG C ~ 80 DEG C, the time being dried is 4h ~ 10h.
Preparation method the most according to claim 1, it is characterised in that the temperature of step (4) described freeze-day with constant temperature is 70 DEG C.
7. the tetrahedron pattern Bi that the arbitrary described preparation method of claim 1 ~ 6 prepares12TiO20/g-C3N4Composite visible light catalyst.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108855172A (en) * | 2017-05-09 | 2018-11-23 | 中国计量大学 | The application of support type class graphite phase carbon nitride photochemical catalyst and its Photocatalytic Degradation of Formaldehyde |
| CN110871101A (en) * | 2019-12-12 | 2020-03-10 | 肇庆学院 | Preparation and application of mesoporous carbon-bismuth titanate composite photocatalytic material |
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| CN101147859A (en) * | 2007-11-08 | 2008-03-26 | 北京师范大学 | Method for preparing porous bismuth titanate photocatalyst |
| US20110155971A1 (en) * | 2009-12-14 | 2011-06-30 | Board of Regents of the Nevada System of Higher Education, | Hydrothermal synthesis of nanocubes of sillenite type compounds for photovoltaic applications and solar energy conversion of carbon dioxide to fuels |
| CN103395837A (en) * | 2013-07-12 | 2013-11-20 | 陕西科技大学 | Preparation method of Bi12TiO20 powder |
| CN104324713A (en) * | 2014-11-20 | 2015-02-04 | 熊菊莲 | Photocatalyst of graphene-bismuth titanate composite material |
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| CN101147859A (en) * | 2007-11-08 | 2008-03-26 | 北京师范大学 | Method for preparing porous bismuth titanate photocatalyst |
| US20110155971A1 (en) * | 2009-12-14 | 2011-06-30 | Board of Regents of the Nevada System of Higher Education, | Hydrothermal synthesis of nanocubes of sillenite type compounds for photovoltaic applications and solar energy conversion of carbon dioxide to fuels |
| CN103395837A (en) * | 2013-07-12 | 2013-11-20 | 陕西科技大学 | Preparation method of Bi12TiO20 powder |
| CN104324713A (en) * | 2014-11-20 | 2015-02-04 | 熊菊莲 | Photocatalyst of graphene-bismuth titanate composite material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108855172A (en) * | 2017-05-09 | 2018-11-23 | 中国计量大学 | The application of support type class graphite phase carbon nitride photochemical catalyst and its Photocatalytic Degradation of Formaldehyde |
| CN110871101A (en) * | 2019-12-12 | 2020-03-10 | 肇庆学院 | Preparation and application of mesoporous carbon-bismuth titanate composite photocatalytic material |
| CN110871101B (en) * | 2019-12-12 | 2022-09-16 | 肇庆学院 | Preparation and application of mesoporous carbon-bismuth titanate composite photocatalytic material |
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| CN105728011B (en) | 2018-03-20 |
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