CN109261203A - A kind of covalent triazine organic polymer photochemical catalyst of efficient methane phase and its preparation and application - Google Patents
A kind of covalent triazine organic polymer photochemical catalyst of efficient methane phase and its preparation and application Download PDFInfo
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- CN109261203A CN109261203A CN201811143362.0A CN201811143362A CN109261203A CN 109261203 A CN109261203 A CN 109261203A CN 201811143362 A CN201811143362 A CN 201811143362A CN 109261203 A CN109261203 A CN 109261203A
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- organic polymer
- covalent triazine
- triazine organic
- photochemical catalyst
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- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 title claims abstract description 59
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 229920000620 organic polymer Polymers 0.000 title claims abstract description 55
- 239000003054 catalyst Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 15
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000001699 photocatalysis Effects 0.000 claims abstract description 12
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 10
- 238000000137 annealing Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000007146 photocatalysis Methods 0.000 claims abstract description 7
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 5
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 36
- 239000007787 solid Substances 0.000 claims description 32
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 15
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 15
- 238000005406 washing Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 12
- 238000005119 centrifugation Methods 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- 229910021529 ammonia Inorganic materials 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000012153 distilled water Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 5
- 235000019441 ethanol Nutrition 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 3
- 238000013019 agitation Methods 0.000 claims description 3
- 239000000908 ammonium hydroxide Substances 0.000 claims description 3
- 239000012298 atmosphere Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229920006391 phthalonitrile polymer Polymers 0.000 claims description 3
- 230000001376 precipitating effect Effects 0.000 claims description 3
- 238000005201 scrubbing Methods 0.000 claims description 3
- 150000003460 sulfonic acids Chemical class 0.000 claims description 3
- 229920000428 triblock copolymer Polymers 0.000 claims description 3
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 2
- 239000004697 Polyetherimide Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 229920001601 polyetherimide Polymers 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 230000009467 reduction Effects 0.000 abstract description 10
- 238000006555 catalytic reaction Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 229910002090 carbon oxide Inorganic materials 0.000 description 4
- 239000012299 nitrogen atmosphere Substances 0.000 description 4
- 239000011941 photocatalyst Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 101710205482 Nuclear factor 1 A-type Proteins 0.000 description 3
- 101710170464 Nuclear factor 1 B-type Proteins 0.000 description 3
- 102100022162 Nuclear factor 1 C-type Human genes 0.000 description 3
- 101710113455 Nuclear factor 1 C-type Proteins 0.000 description 3
- 101710140810 Nuclear factor 1 X-type Proteins 0.000 description 3
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000013311 covalent triazine framework Substances 0.000 description 3
- 230000008774 maternal effect Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- UXAMZEYKWGPDBI-UHFFFAOYSA-N C(CCCCCCCCCCCCCCC)Br(C)(C)C Chemical class C(CCCCCCCCCCCCCCC)Br(C)(C)C UXAMZEYKWGPDBI-UHFFFAOYSA-N 0.000 description 1
- 108010018842 CTF-1 transcription factor Proteins 0.000 description 1
- 241000790917 Dioxys <bee> Species 0.000 description 1
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 125000002252 acyl group Chemical group 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004177 carbon cycle Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 125000003963 dichloro group Chemical group Cl* 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 150000003949 imides Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 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
Classifications
-
- 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
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/06—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing polymers
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C1/00—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon
- C07C1/02—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon from oxides of a carbon
-
- 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
- B01J2231/00—Catalytic reactions performed with catalysts classified in B01J31/00
- B01J2231/60—Reduction reactions, e.g. hydrogenation
- B01J2231/62—Reductions in general of inorganic substrates, e.g. formal hydrogenation, e.g. of N2
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Catalysts (AREA)
Abstract
The invention discloses it is a kind of can efficient methane phase covalent triazine organic polymer photochemical catalyst and the preparation method and application thereof, belong to catalysis material preparation technical field, it is using rodlike silica as template, it is mixed with covalent triazine organic polymer, the covalent triazine organic polymer photochemical catalyst is synthesized using annealing method.The catalyst has good visible light-responded, can efficiently realize that visible light photocatalysis reduction carbon dioxide is methane, and used annealing method is simple and convenient, and lower production costs have a good application prospect.
Description
Technical field
The invention belongs to catalysis material preparation technical fields, and in particular to it is a kind of can the covalent triazine of efficient methane phase have
Machine Polymer photocatalyst and its preparation and application.
Background technique
A large amount of burnings of fossil fuel lead to CO in atmosphere2Concentration is continuously increased, and has caused a system such as global warming
Column environmental problem, CO2Emission reduction and transformation technology become research emphasis instantly.Photocatalitic Technique of Semiconductor can use nature
Inexhaustible solar energy is by CO in boundary2The carbon-containing fuels such as methane are reduced to, the carbon cycle of nature is realized, are to solve temperature
The effective ways of the problems such as room effect and energy shortage.However, CO2Molecule has sufficiently stable linear structure, needs high
Activation energy and catalyst appropriate can just be translated into available carbon resource.Therefore, new and effective visible light is developed
Catalysis reduction CO2For CH4Photochemical catalyst be current research hot spot.
It has been reported that novel photocatalyst in, covalent triazine organic polymer (CTFs) is a kind of to be connected by triazine ring
Organo-functional group and the organic polymer formed have visible light-responded and suitable band structure.Meanwhile as a kind of rich nitrogen
The covalent organic frame of type, CTFs have good CO2Adsorption capacity is conducive to be translated into available carbon resource.But
Be CTFs there are still light absorpting abilities it is poor, photo-generated carrier recombination rate is high the problems such as, constrain it in photocatalysis field into one
Step application.Studies have shown that annealed, treated that photocatalytic semiconductor material can reduce surface defect, removes adsorption
Ammonia (NH3), more holes can also be formed, increases its specific surface area, exposes more active sites, its light can be improved
Catalytic activity.
Summary of the invention
The purpose of the present invention is to provide it is a kind of can efficiently the covalent triazine organic polymer photochemical catalyst of methane phase and its
Preparation method and application, the catalyst have it is good visible light-responded, can efficiently realize visible light photocatalysis restore dioxy
Change carbon is methane, while the preparation of the catalyst, to the of less demanding of equipment, production cost is low, there is good application prospect.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of covalent triazine organic polymer photochemical catalyst of efficient methane phase is incited somebody to action using rodlike silica as template
It is mixed with covalent triazine organic polymer, is synthesized using annealing method.The catalyst have it is good visible light-responded, can be used for
Photocatalytic reduction of carbon oxide is in the reaction of methane.
The preparation method of the covalent triazine organic polymer photochemical catalyst the following steps are included:
(1) preparation of covalent triazine organic polymer:
Under the conditions of 0 DEG C, 40 mL trifluoromethayl sulfonic acids are slowly added into 5.12 g para-Phthalonitriles, replace oil bath and are risen
Temperature is to 30 DEG C, and after standing 3 days, obtained solid is blended, with 100-160 mL methylene chloride washing and filtering, then with ammonia scrubbing number
It is secondary, 150-200 mL ammonium hydroxide is then added, 12 h, washing centrifugation to neutrality are sufficiently stirred, again with methanol cleaning is centrifuged primary；It will
Obtained solid precipitating methanol flows back 10-30 h under the conditions of 80-100 DEG C, then with methylene chloride under the conditions of 60-80 DEG C
Flow back 10-30 h, collects solid and in 80 DEG C of 12 h of vacuum drying, obtains covalent triazine organic polymer；
(2) preparation of rodlike silica:
By the triblock copolymer F127 of 0.7-0.8 g, that 1.8-2.0 g cetyl trimethylammonium bromide is added to 180 mL is dense
Degree is the ethyl orthosilicate of 6-8 mL to be instilled under agitation, after sufficiently reacting 2-4 h in the ammonia spirit of 0.9-1wt.%
Washing, then flow back in the mixed solution of hydrochloric acid and ethyl alcohol 2-4 h, adds water to be configured to 25-30 mg/mL obtained solid
Suspension；Then the above-mentioned suspension of 60 mL is taken, is added in the polyetherimide solution of 1200 mL, 5 mg/mL, 90 DEG C of conditions
Lower reaction 2-4 h is cooled to the solid washed several times with water that will be obtained after room temperature, and vacuum drying, which is placed at 550 DEG C, calcines 2-4
H obtains rodlike silica；
(3) preparation of covalent triazine organic polymer photochemical catalyst:
The rodlike silica of 0.1-0.2 g and 0.3-0.4 g covalent triazine organic polymer are weighed respectively, are mixed in 10-
In 20 mL distilled water, heats and be evaporated under the conditions of 70-90 DEG C of oil bath；Obtained solid grinding is placed in tube furnace, in nitrogen
1-2 h is heat-treated in gas atmosphere at 400-550 DEG C；It is cooled to the hydrofluoric acid that solid sample is placed in after room temperature 10wt.%
In solution, 4 h are stirred at 65-85 DEG C, are dried at 60 DEG C after washing centrifugation for several times；By the sample methanol after drying
Flow back 10-30 h under the conditions of 80-100 DEG C, collects solid and in 60 DEG C of dry 12 h to get organic to the covalent triazine
Polymer photocatalyst.
The covalent triazine organic polymer photochemical catalyst is in methane in visible light efficient photocatalytic reduction of carbon oxide
Application.
Remarkable advantage of the invention is:
(1) present invention for the first time makes annealing treatment covalent triazine organic polymer, and preparing a kind of can efficiently methane phase be total to
Valence triazine organic polymer visible-light photocatalyst；
(2) preparation method of the present invention is simple and convenient, and production cost is low, has a good application prospect；
(3) present invention gained photochemical catalyst catalytic activity is good, and can be realized visible light photocatalysis reduction carbon dioxide is methane, tool
There are good practical value and application prospect.
Detailed description of the invention
Fig. 1 is covalent triazine organic polymer and the resulting covalent triazine organic polymer photochemical catalyst of embodiment 1-4
Fourier transform infrared spectroscopy figure；
Fig. 2 be covalent triazine organic polymer and the resulting covalent triazine organic polymer photochemical catalyst of embodiment 1-4 it is ultraviolet-
It can be seen that the spectrogram that diffuses；
Fig. 3 is that covalent triazine organic polymer is visible with the resulting covalent triazine organic polymer photochemical catalyst of embodiment 1-4
Light photocatalytic reduction of carbon oxide is the effect contrast figure of methane.
Specific embodiment
In order to make content of the present invention easily facilitate understanding, With reference to embodiment to of the present invention
Technical solution is described further, but the present invention is not limited only to this.
The preparation of covalent triazine organic polymer: under the conditions of 0 DEG C, 40 mL trifluoromethayl sulfonic acids are slowly added into
In 5.12 g para-Phthalonitriles, replaces oil bath and be warming up to 30 DEG C, after standing 3 days, obtained solid is blended, with 160 mL dichloros
Methane washing and filtering, then for several times with ammonia scrubbing, 200 mL ammonium hydroxide are then added, 12 h are sufficiently stirred, washing is centrifuged to neutrality,
Again with methanol cleaning centrifugation is primary；Obtained solid precipitating is flowed back 10 h with methanol under the conditions of 90 DEG C, then uses methylene chloride
Flow back 10 h under the conditions of 70 DEG C, collects solid and in 80 DEG C of 12 h of vacuum drying, obtains covalent triazine organic polymer, note
For CTF-1.
The preparation of rodlike silica: by the triblock copolymer F127 of 0.738 g, 1.8 g cetyl trimethyl bromines
Change ammonium to be added in the ammonia spirit that 180 mL concentration are 0.9wt.%, instills the ethyl orthosilicate of 6 mL under agitation, fill
Divide washed several times with water after reacting 4 h, then flow back in the mixed solution of hydrochloric acid and ethyl alcohol (1:20, v/v) 4 h, consolidates what is obtained
Body adds water to be configured to the suspension of 25 mg/mL；Then the above-mentioned suspension of 60 mL is taken, the polyethers acyl of 1200 mL, 5 mg/mL are added to
In imide liquor, 4 h are reacted under the conditions of 90 DEG C, are cooled to the solid washed several times with water that will be obtained after room temperature, are dried in vacuo postposition
2 h are calcined at 550 DEG C, obtain rodlike silica.
Embodiment 1 can efficiently methane phase covalent triazine organic polymer photochemical catalyst preparation
The rodlike silica of 0.1 g and 0.3 g covalent triazine organic polymer are weighed respectively, are mixed in 20 mL distilled water
In, moisture, which is heated to, under the conditions of 90 DEG C of oil baths is evaporated；Obtained solid grinding is placed in tube furnace, in nitrogen atmosphere
2 h are heat-treated at 400 DEG C；Solid sample is placed in the hydrofluoric acid solution of 10wt.% after being cooled to room temperature, at 85 DEG C
4 h of lower stirring are dried at 60 DEG C after washing centrifugation for several times；Sample after drying is flowed back under the conditions of 90 DEG C with methanol
10 h, collect solid and 60 DEG C of dry 12 h to get can efficient methane phase covalent triazine organic polymer photochemical catalyst,
It is denoted as CTF-400.
Embodiment 2 can efficiently methane phase covalent triazine organic polymer photochemical catalyst preparation
The rodlike silica of 0.1 g and 0.3 g covalent triazine organic polymer are weighed respectively, are mixed in 20 mL distilled water
In, moisture, which is heated to, under the conditions of 90 DEG C of oil baths is evaporated；Obtained solid grinding is placed in tube furnace, in nitrogen atmosphere
2 h are heat-treated at 450 DEG C；Solid sample is placed in the hydrofluoric acid solution of 10wt.% after being cooled to room temperature, at 85 DEG C
4 h of lower stirring are dried at 60 DEG C after washing centrifugation for several times；Sample after drying is flowed back under the conditions of 90 DEG C with methanol
10 h, collect solid and 60 DEG C of dry 12 h to get can efficient methane phase covalent triazine organic polymer photochemical catalyst,
It is denoted as CTF-450.
Embodiment 3 can efficiently methane phase covalent triazine organic polymer photochemical catalyst preparation
The rodlike silica of 0.1 g and 0.3 g covalent triazine organic polymer are weighed respectively, are mixed in 20 mL distilled water
In, moisture, which is heated to, under the conditions of 90 DEG C of oil baths is evaporated；Obtained solid grinding is placed in tube furnace, in nitrogen atmosphere
2 h are heat-treated at 500 DEG C；Solid sample is placed in the hydrofluoric acid solution of 10wt.% after being cooled to room temperature, at 85 DEG C
4 h of lower stirring are dried at 60 DEG C after washing centrifugation for several times；Sample after drying is flowed back under the conditions of 90 DEG C with methanol
10 h, collect solid and 60 DEG C of dry 12 h to get can efficient methane phase covalent triazine organic polymer photochemical catalyst,
It is denoted as CTF-500.
Embodiment 4 can efficiently methane phase covalent triazine organic polymer photochemical catalyst preparation
The rodlike silica of 0.1 g and 0.3 g covalent triazine organic polymer are weighed respectively, are mixed in 20 mL distilled water
In, moisture, which is heated to, under the conditions of 90 DEG C of oil baths is evaporated；Obtained solid grinding is placed in tube furnace, in nitrogen atmosphere
2 h are heat-treated at 550 DEG C；Solid sample is placed in the hydrofluoric acid solution of 10wt.% after being cooled to room temperature, at 85 DEG C
4 h of lower stirring are dried at 60 DEG C after washing centrifugation for several times；Sample after drying is flowed back under the conditions of 90 DEG C with methanol
10 h, collect solid and 60 DEG C of dry 12 h to get can efficient methane phase covalent triazine organic polymer photochemical catalyst,
It is denoted as CTF-550.
Performance test
Fig. 1 is the Fourier of covalent triazine organic polymer photochemical catalyst obtained by covalent triazine organic polymer and embodiment 1-4
Transform infrared spectroscopy figure.It can be seen from the figure that the resulting photochemical catalyst sample of embodiment 1-4 show it is basic with maternal sample
Consistent characteristic absorption peak, the covalent triazine organic polymer after showing annealing do not change its triazine main frame structure.
Fig. 2 is the purple of covalent triazine organic polymer photochemical catalyst obtained by covalent triazine organic polymer and embodiment 1-4
Outside-visible the spectrogram that diffuses.From figure it can be found that relative to maternal sample, the photochemical catalyst sample after annealing is visible
Occur a new absorption band in optical range, has widened the light abstraction width of catalyst, improved the absorbing properties of catalyst.
Catalyst amount is 10 mg, and using 300 W xenon lamps as light source, light source is filtered through optical filter, to guarantee that incident light is
Visible light (nm of λ >=420), reaction system are triethylamine and water, reaction unit are vacuumized to and is passed through carbon dioxide, progress can
Light-exposed photocatalytic reduction of carbon oxide is the active testing of methane.Fig. 3 is obtained by covalent triazine organic polymer and embodiment 1-4
The visible light photocatalysis reduction carbon dioxide of covalent triazine organic polymer is the effect contrast figure of methane.From figure 3, it can be seen that
Maternal sample activity is lower, and the methanogenesis activity of annealed photochemical catalyst sample obtained all obtains different degrees of raising,
The photochemical catalyst sample CTF-450 obtained that wherein anneals at 450 DEG C shows highest visible light photocatalysis reduction CO2For
The activity of methane.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, is all covered by the present invention.
Claims (4)
1. a kind of covalent triazine organic polymer photochemical catalyst of efficient methane phase, it is characterised in that: with rodlike silica work
For template, it is mixed with covalent triazine organic polymer, the covalent triazine organic polymer object light is synthesized using annealing method and is urged
Agent.
2. a kind of method for preparing covalent triazine organic polymer photochemical catalyst as described in claim 1, it is characterised in that: packet
Include following steps:
(1) preparation of covalent triazine organic polymer:
Under the conditions of 0 DEG C, 40 mL trifluoromethayl sulfonic acids are slowly added into 5.12 g para-Phthalonitriles, replace oil bath and are risen
Temperature is to 30 DEG C, and after standing 3 days, obtained solid is blended, with 100-160 mL methylene chloride washing and filtering, then with ammonia scrubbing, so
150-200 mL ammonium hydroxide is added afterwards, 12 h, washing centrifugation to neutrality are sufficiently stirred, again with methanol cleaning is centrifuged primary；By what is obtained
Solid precipitating methanol flows back 10-30 h under the conditions of 80-100 DEG C, then is flowed back under the conditions of 60-80 DEG C with methylene chloride
10-30 h collects solid and in 80 DEG C of 12 h of vacuum drying, obtains covalent triazine organic polymer；
(2) preparation of rodlike silica:
By the triblock copolymer F127 of 0.7-0.8 g, that 1.8-2.0 g cetyl trimethylammonium bromide is added to 180 mL is dense
Degree is the ethyl orthosilicate of 6-8 mL to be instilled under agitation, after sufficiently reacting 2-4 h in the ammonia spirit of 0.9-1wt.%
Washing, then flow back in the mixed solution of hydrochloric acid and ethyl alcohol 2-4 h, adds water to be configured to 25-30 mg/mL obtained solid
Suspension；Then the above-mentioned suspension of 60 mL is taken, is added in the polyetherimide solution of 1200 mL, 5 mg/mL, 90 DEG C of conditions
Lower reaction 2-4 h, washes obtained solid after being cooled to room temperature, and vacuum drying, which is placed at 550 DEG C, calcines 2-4
H obtains rodlike silica；
(3) preparation of covalent triazine organic polymer photochemical catalyst:
The rodlike silica of 0.1-0.2 g and 0.3-0.4 g covalent triazine organic polymer are weighed respectively, are mixed in 10-
In 20 mL distilled water, heats and be evaporated under the conditions of 70-90 DEG C of oil bath；Obtained solid grinding is placed in tube furnace, in nitrogen
1-2 h is heat-treated in gas atmosphere at 400-550 DEG C；It is cooled to the hydrofluoric acid that solid sample is placed in after room temperature 10wt.%
In solution, 4 h are stirred at 65-85 DEG C, are dried at 60 DEG C after washing centrifugation；Sample methanol after drying is existed
Flow back 10-30 h under the conditions of 80-100 DEG C, collects solid and in 60 DEG C of dry 12 h to get organic poly- to the covalent triazine
Close object light catalyst.
3. the preparation method of covalent triazine organic polymer photochemical catalyst according to claim 2, it is characterised in that: step
(2) volume ratio of hydrochloric acid and ethyl alcohol is 1:20 in the mixed solution.
4. a kind of covalent triazine organic polymer photochemical catalyst as described in claim 1 restores carbon dioxide in visible light photocatalysis
For the application in methane.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811143362.0A CN109261203B (en) | 2018-09-28 | 2018-09-28 | Covalent triazine organic polymer photocatalyst capable of efficiently producing methane, and preparation and application thereof |
Applications Claiming Priority (1)
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| CN113754667B (en) * | 2021-09-28 | 2023-01-10 | 西湖大学 | Method for rapidly and massively preparing high-crystalline semiconductor covalent triazine framework |
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