CN106902803A - Compound photocatalytic system CQDS‑KNbO3And its preparation method and application - Google Patents
Compound photocatalytic system CQDS‑KNbO3And its preparation method and application Download PDFInfo
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- 230000001699 photocatalysis Effects 0.000 title claims abstract description 37
- 150000001875 compounds Chemical class 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 229910003334 KNbO3 Inorganic materials 0.000 claims abstract description 59
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 24
- 239000001257 hydrogen Substances 0.000 claims abstract description 24
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000008367 deionised water Substances 0.000 claims abstract description 5
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 5
- 239000007864 aqueous solution Substances 0.000 claims abstract description 4
- 239000013078 crystal Substances 0.000 claims description 20
- 230000015556 catabolic process Effects 0.000 claims description 17
- 238000006731 degradation reaction Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 14
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 9
- 238000001354 calcination Methods 0.000 claims description 9
- 239000000356 contaminant Substances 0.000 claims description 8
- 238000007146 photocatalysis Methods 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 8
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- ZKATWMILCYLAPD-UHFFFAOYSA-N niobium pentoxide Inorganic materials O=[Nb](=O)O[Nb](=O)=O ZKATWMILCYLAPD-UHFFFAOYSA-N 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000011668 ascorbic acid Substances 0.000 claims description 3
- 229960005070 ascorbic acid Drugs 0.000 claims description 3
- 235000010323 ascorbic acid Nutrition 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 2
- 238000005119 centrifugation Methods 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 239000002131 composite material Substances 0.000 abstract description 9
- 239000011941 photocatalyst Substances 0.000 abstract description 8
- 239000003344 environmental pollutant Substances 0.000 abstract description 5
- 231100000719 pollutant Toxicity 0.000 abstract description 5
- 230000001603 reducing effect Effects 0.000 abstract description 5
- 230000009977 dual effect Effects 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 abstract description 3
- 239000002957 persistent organic pollutant Substances 0.000 abstract description 3
- 230000005855 radiation Effects 0.000 abstract 1
- 239000003054 catalyst Substances 0.000 description 14
- 238000010521 absorption reaction Methods 0.000 description 7
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
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- 239000000126 substance Substances 0.000 description 3
- 238000000149 argon plasma sintering Methods 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 239000003426 co-catalyst Substances 0.000 description 2
- ZXJXZNDDNMQXFV-UHFFFAOYSA-M crystal violet Chemical compound [Cl-].C1=CC(N(C)C)=CC=C1[C+](C=1C=CC(=CC=1)N(C)C)C1=CC=C(N(C)C)C=C1 ZXJXZNDDNMQXFV-UHFFFAOYSA-M 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
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- 238000004020 luminiscence type Methods 0.000 description 2
- 238000003760 magnetic stirring Methods 0.000 description 2
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- 239000003643 water by type Substances 0.000 description 2
- 238000002835 absorbance Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011953 bioanalysis Methods 0.000 description 1
- 238000002306 biochemical method Methods 0.000 description 1
- 238000005234 chemical deposition Methods 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 238000010525 oxidative degradation reaction Methods 0.000 description 1
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- 230000001172 regenerating effect Effects 0.000 description 1
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- 238000011105 stabilization Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000003403 water pollutant 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
- 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
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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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/20—Vanadium, niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The present invention relates to compound photocatalytic system CQDS‑KNbO3And its preparation method and application.Preparation method comprises the following steps：By carbon quantum dot CQDSIt is dissolved in deionized water, then by KNbO3It is added to carbon quantum dot CQDSIn the aqueous solution, 1h is stirred, in being dried at 80 DEG C, obtain compound photocatalytic system CQDS‑KNbO3.The composite photocatalyst system CQD with Strong oxdiative reducing activity that the present invention is providedS‑KNbO3, pollutant is considered as a kind of resource, reached the dual purpose that environmental improvement produces clean energy resource simultaneously by hydrogen manufacturing while may be implemented in degradable organic pollutant under radiation of visible light.
Description
Technical field
The invention belongs to photocatalysis field, and in particular to compound photocatalytic system CQDS-KNbO3Preparation and visible
Application under light irradiation in photocatalysis degradation organic contaminant and hydrogen manufacturing simultaneously.
Background technology
Environmental pollution has developed into the Tough questions that the mankind in social development process must face.The meeting in dye industry
Some azo dyes are produced, due to their Stability Analysis of Structures, high toxicity with electron withdraw group, therefore is difficult degraded.This kind of difficulty
Degradation of contaminant can be present in environment for a long time, have very big harm to ecological environment and human health.However, individually to this kind of
Recalcitrant chemicals are degraded without using a kind of waste for being also resource.So a method for economical rationality should be proposed
To solve this problem.In fact, Recalcitrant chemicals can be as an available resource, by a suitable method
Not only regenerative resource can be produced with degradation of contaminant but also simultaneously.Energy crisis has become the problem of global concern after all.
So far, there are many methods for degradation of contaminant, such as bioanalysis, physics and chemistry method, flocculence and absorption method.But
The Biochemical method time is more long, since it is desired that culture microorganism for a long time, and other method is to only reside within how to degrade
In pollutant aspect, a kind of green high-efficient is not formed, be conducive to the contaminant degradation system of environment.Under comparing, half
Conductor photochemical catalyst, stable chemical nature, oxidation-reduction quality is strong, long service life.Therefore, by photocatalytic method, using cheap
There is redox reaction in abundant solar energy, realize to the degraded of persistent organic pollutants and produce fuel value high simultaneously
And combustion product is the Hydrogen Energy of water and non-environmental-pollution, not only degrades pollutant and additionally provide a kind of product hydrogen technology of simplicity,
Realize the dual purpose of environmental improvement and production clean energy resource.
In order to realize above-mentioned dual purpose, the wide band gap semiconducter catalyst with Strong oxdiative reducing activity should be selected.
But alternative such semi-conducting material is considerably less, and because band gap wide needs energy very high to excite.
KNbO3It is a kind of nontoxic, highly stable under light illumination perovskite composite oxide.But, KNbO3As photocatalytic degradation
Hydrogen manufacturing material, has certain disadvantages.KNbO3With band gap (3.3eV) wider, energy gap is larger, it is impossible to effective profit
With the visible light part in sunshine, light utilization efficiency is low.Also, KNbO3Hole and the compound probability of light induced electron it is higher,
This causes that photo-generated carrier utilization ratio is low.
The content of the invention
It is an object of the invention to provide a kind of composite photocatalyst system CQD with Strong oxdiative reducing activityS-KNbO3, with
Realize hydrogen manufacturing while degradable organic pollutant under visible light illumination.
The present invention is achieved through the following technical solutions, compound photocatalytic system CQDS-KNbO3, preparation method includes
Following steps：By carbon quantum dot CQDSIt is dissolved in deionized water, then by KNbO3It is added to carbon quantum dot CQDSIn the aqueous solution,
Stirring 1h, in being dried at 80 DEG C, obtains compound photocatalytic system CQDS-KNbO3。
Above-mentioned compound photocatalytic system CQDS-KNbO3, in mass ratio, carbon quantum dot CQDS:KNbO3=0.075-
0.3:1。
Above-mentioned compound photocatalytic system CQDS-KNbO3, described carbon quantum dot CQDSPreparation method include it is as follows
Step：By ascorbic acid, ethylene glycol and deionized water, after being uniformly mixed, polytetrafluoroethyllining lining stainless steel is sealed in high
In pressure reactor, 70-80min is heated at 150-170 DEG C, naturally cool to room temperature, be centrifuged, filtering obtains carbon quantum dot CQDS。
Above-mentioned compound photocatalytic system CQDS-KNbO3, described KNbO3Preparation method comprise the following steps：Will
Nb2O5And KOH, after being uniformly mixed, it is sealed in polytetrafluoroethyllining lining stainless steel autoclave, at 150-170 DEG C
Heating 12-13h, is cooled to room temperature, and product is ground, and is put into calcining in Muffle furnace, and calcining heat is 400 DEG C, and calcination time is
1h, is cooled to room temperature, grinding, obtains KNbO3。
Above-mentioned compound photocatalytic system CQDS-KNbO3Application in photocatalysis degradation organic contaminant.Method is such as
Under：By compound photocatalytic system CQDS-KNbO3It is added in the solution containing organic pollution, it is seen that light irradiation 1.0-
5.0h.Preferably, described organic pollution is crystal violet.
Above-mentioned compound photocatalytic system CQDS-KNbO3Application in crystal violet as sacrifice agent Photocatalyzed Hydrogen Production.
Method is as follows：By compound photocatalytic system CQDS-KNbO3It is added in the solution containing crystal violet, it is seen that light irradiation 1.0-
5.0h。
Carbon quantum dot (CQDs), be it is a kind of possess torispherical structure and stablize fluorescence property, size is new less than 10nm
Type carbon nanomaterial.From unlike metal quantum point, CQDs can not only emit a brilliant light in the presence of exciting light, separately
Outward, it also have the advantages that biocompatibility, hypotoxicity and be easy to get, it is cheap.CQDs has similar to semiconductor-quantum-point
Absorption line.For to a certain extent, CQDs is it is also assumed that belong to semiconductor-quantum-point, the Absorption Characteristics peak of CQDs typically goes out
Present ultra-violet (UV) band, but used as a kind of black material, it also has a certain degree of absorption to full spectrum.It is very excellent except possessing
Fluorescence property, CQDs also has remarkable upper conversion performance.Up-conversion luminescence is also referred to as anti-Stokes luminescence, i.e., with relatively low
The excitation of frequency goes out the launching light of upper frequency.Using the outstanding upper conversion performances of CQDs, it will be seen that light is converted into purple
Outer light.The present invention, by KNbO3CQD is combined into CQDsS-KNbO3System, solves KNbO3Can not effectively using in sunshine
Visible ray this drawback, greatly improve light utilization efficiency.Meanwhile, carbon quantum dot both can be as the donor of electronics, it is also possible to make
It is the acceptor of electronics, on electro transfer to CQDs, KNbO is prevented to a certain extent3Conduction band electron and valence band hole it is compound, from
And retain KNbO3On conduction band on the electronics and valence band of strong reducing property strong oxidizing property hole.The present invention, by the use of CQDs as turning light
Agent and co-catalyst, realize the hydrogen manufacturing simultaneously of efficient photocatalysis degradation organic contaminant.
The beneficial effects of the invention are as follows：The present invention devises a photocatalytic system CQD for new visible light-inducingS-
KNbO3, and successfully prepared by hydro-thermal and chemical deposition.Degraded under visible light illumination knot using the catalyst for obtaining
Crystalviolet hydrogen manufacturing simultaneously.Carbon quantum dot (CQDS) visible ray of absorption is converted into ultraviolet light, so that KNbO3Excite generation photoproduction electricity
Sub- hole pair.KNbO3Retain the electronics of strong reducing property on conduction band, by co-catalyst CQDSCapture and H+Reaction produces H2, KNbO3Valency
Take the hole for retaining strong oxidizing property, oxidative degradation crystal violet.The novel photocatalysis system of present invention design has strong oxidation
Reproducibility, and pollutant is considered as a kind of resource, Hydrogen Energy is produced while pollutant is removed using photocatalysis technology, reach
Environmental improvement produces the dual purpose of clean energy resource simultaneously.
Specific embodiment
The composite photocatalyst system CQD of embodiment 1S-KNbO3
1、KNbO3The preparation of particle：
KNbO is prepared using hydro-thermal method3Particle.By 3.57g Nb2O5Powder and 37.69g KOH chip solids are added to dress
Have in the beaker of 19ml deionized waters, stirred 30 minutes on magnetic stirring apparatus, until Nb2O5It is well mixed with KOH, it is all molten
Solution.Then mixture is sealed in a polytetrafluoroethyllining lining stainless steel autoclave, is heated under conditions of 160 DEG C
12h.It is cooled to room temperature.Product is ground to graininess, calcining in Muffle furnace is put into, calcining heat is 400 DEG C, and calcination time is
1h.Room temperature is cooled to, is ground, obtain KNbO3Particle.
2nd, the preparation of carbon quantum dot CQDs：
CQD is prepared using hydro-thermal methodS.By 1.6g ascorbic acid, 15ml ethylene glycol and 25ml deionized waters are added to beaker
In, stirred 30 minutes on magnetic stirring apparatus.Then mixture is sealed in a polytetrafluoroethyllining lining stainless steel high pressure anti-
Answer in kettle, 70min is heated at 160 DEG C, naturally cool to room temperature, be centrifuged, filtering obtains yellowish-brown transparency liquid.
3rd, composite photocatalyst system CQDS-KNbO3Preparation：
By 0.5g KNbO3Particle is added to the carbon quantum dot that 75ml concentration is respectively 0,0.5,1.0,1.5 and 2.0mg/mL
In the CQDs aqueous solution, after stirring 1h, dried 8 hours at 80 DEG C, that is, obtain target product composite photocatalyst system CQDS-
KNbO3, corresponding compound system is labeled as C/K 0, C/K 0.5, C/K 1.0, C/K 1.5 and C/K 2.0.
The composite photocatalyst system CQD of embodiment 2S-KNbO3Visible light photocatalytic degradation crystal violet
(1) light application time influences on crystal violet photocatalytic degradation
Visible light photocatalytic degradation：The crystal violet solution of 50.0mL 10.0mg/L is taken in 100mL conical flasks, is added and is implemented
CQD prepared by example 1S-KNbO350.0mg, irradiates 1.0~5.0h under visible light.Filtering, determines its ultraviolet in 200-800nm
Spectrum.Take the degradation rate that the absorbance at 582nm calculates crystal violet.
Degradation rate (%)=(C0–C)/C0× 100% (wherein C0：The concentration of stoste；C：The concentration of sample).The results are shown in Table
1。
The composite photocatalyst system CQD of table 1S-KNbO3Photocatalytic Activity for Degradation crystal violet
As shown in table 1, with the extension of light application time, 1.5 pairs of knots of catalyst C/K 0, C/K 0.5, C/K 1.0, C/K
The degradation rate of crystalviolet all gradually increases, and with CQDSConcentration constantly increase, the degradation rate of crystal violet also increases.C/
K1.5, when light application time is 5.0h, degradation rate highest reaches 66.6%.C/K 2.0 is compared with C/K 1.5, and degradation rate does not have
It is further to increase, because as CQDs is in compound system CQDS-KNbO3Increase, due to the light scattering of transparency and CQDs
The absorption of incident light is reduced, causes catalysis activity to reduce, degradation rate reduction.
(2) access times of catalyst system and catalyzing are on the photodegradative influence of crystal violet
Method：Choose C/K 1.5, it is seen that irradiate 4.0h under light.Other only change the access times of catalyst.The results are shown in Table
2。
Influence of the access times of table 2 to Visible Light Induced Photocatalytic crystal violet
From Table 2, it can be seen that as catalyst access times increase, the degradation rate of crystal violet is not occurred significantly
Decline.This represent in four continuous cyclic tests, photocatalytic system CQDS-KNbO3(C/K 1.5) presents good light
Degrading activity.Therefore when water pollutant is removed, the catalyst system and catalyzing has preferable stability.
The composite photocatalyst system CQD of embodiment 3S-KNbO3It is sacrifice agent Photocatalyzed Hydrogen Production with crystal violet
(1) light application time is the influence of sacrifice agent Photocatalyzed Hydrogen Production amount to crystal violet
Method：The crystal violet solution of 500mL 50.0mg/L is measured in Photocatalyzed Hydrogen Production reactor, adds embodiment 1 to make
Standby catalyst 200.0mg, irradiates 1.0~5.0h under visible light.Hydrogen produced in reacting is measured with gas-chromatography
Amount.The results are shown in Table 3.
The compound system CQD of table 3S-KNbO3Visible light photocatalysis produce hydrogen
As shown in table 3, with the extension of light application time, catalyst C/K 0, C/K 0.5, C/K 1.0, the product of C/K 1.5
Hydrogen amount all rises with the increase of CQDs concentration.C/K 1.5, when light application time is 5.0h, the amount for producing hydrogen reaches maximum, is
93.74μmol.C/K 2.0 is compared with C/K 1.5, and hydrogen output does not have further increase, because as CQDs is compound
System CQDS-KNbO3Increase, the absorption of incident light is reduced due to the light scattering of transparency and CQDs, cause catalysis activity to drop
It is low, hydrogen output reduction.
(2) influence of the access times of catalyst system and catalyzing to Photocatalyzed Hydrogen Production
Method：Choose C/K 1.5, it is seen that irradiate 4.0h under light.Other only change the access times of catalyst.The results are shown in Table
4。
Table 4 changes influence of the access times to visible ray hydrogen manufacturing
As can be seen from Table 4, as catalyst access times increase, Photocatalyzed Hydrogen Production amount keeps stabilization, without obvious
Decline.This represent in continuous four cyclic tests, photocatalytic system CQDS-KNbO3(C/K 1.5) presents good
Photocatalytic activity.Therefore when hydrogen is produced in the hydrolysis of photocatalytic degradation crystal violet, the catalyst system and catalyzing has preferable stability.
Claims (9)
1. compound photocatalytic system CQDS-KNbO3, it is characterised in that preparation method comprises the following steps：By carbon quantum dot
CQDSIt is dissolved in deionized water, then by KNbO3It is added to carbon quantum dot CQDSIn the aqueous solution, 1h is stirred, in baking at 80 DEG C
It is dry, obtain compound photocatalytic system CQDS-KNbO3。
2. compound photocatalytic system CQD according to claim 1S-KNbO3, it is characterised in that in mass ratio, carbon quantum
Point CQDS:KNbO3=0.075-0.3:1.
3. compound photocatalytic system CQD according to claim 1 and 2S-KNbO3, it is characterised in that described carbon quantum
Point CQDSPreparation method comprise the following steps：By ascorbic acid, ethylene glycol and deionized water, after being uniformly mixed, sealing
In polytetrafluoroethyllining lining stainless steel autoclave, 70-80min is heated at 150-170 DEG C, naturally cools to room temperature,
Centrifugation, filtering, obtains carbon quantum dot CQDS。
4. compound photocatalytic system CQD according to claim 1 and 2S-KNbO3, it is characterised in that described KNbO3
Preparation method comprise the following steps：By Nb2O5And KOH, after being uniformly mixed, it is sealed in polytetrafluoroethyllining lining stainless steel
In autoclave, 12-13h is heated at 150-170 DEG C, is cooled to room temperature, product is ground, be put into calcining in Muffle furnace,
Calcining heat is 400 DEG C, and calcination time is 1h, is cooled to room temperature, grinding, obtains KNbO3。
5. the compound photocatalytic system CQD described in any one of claim 1-4S-KNbO3In photocatalysis degradation organic contaminant
In application.
6. application according to claim 5, it is characterised in that method is as follows：By compound photocatalytic system CQDS-KNbO3
It is added in the solution containing organic pollution, it is seen that light irradiation 1.0-5.0h.
7. application according to claim 5, it is characterised in that described organic pollution is crystal violet.
8. the compound photocatalytic system CQD described in any one of claim 1-4S-KNbO3Urged by sacrifice agent light of crystal violet
Change the application produced in hydrogen.
9. application according to claim 8, it is characterised in that method is as follows：By compound photocatalytic system CQDS-KNbO3
It is added in the solution containing crystal violet, it is seen that light irradiation 1.0-5.0h.
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| CN107649107A (en) * | 2017-09-25 | 2018-02-02 | 兰州大学 | A kind of quantum dot/TiO2The preparation method and applications of composite |
| CN108201878A (en) * | 2018-02-08 | 2018-06-26 | 华南理工大学 | The preparation method and water pollutant of a kind of carbon dots modified metal organic backbone sorbing material administer application |
| CN109999882A (en) * | 2019-04-25 | 2019-07-12 | 湖南大学 | A kind of carbon quantum dot-graphite phase carbon nitride composite material, preparation method and application |
| WO2019229255A1 (en) | 2018-05-31 | 2019-12-05 | Cambridge Enterprise Limited | Photocatalyst and photocatalytic methods for producing hydrogen |
| CN110142838B (en) * | 2019-06-04 | 2020-11-20 | 北京林业大学 | Preparation method of phase change energy storage wood with carbon-coated metal filler |
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| CN103480353A (en) * | 2013-10-01 | 2014-01-01 | 大连理工大学 | Method for synthesis of carbon quantum dot solution by hydrothermal process to prepare composite nano-photocatalyst |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107649107A (en) * | 2017-09-25 | 2018-02-02 | 兰州大学 | A kind of quantum dot/TiO2The preparation method and applications of composite |
| CN108201878A (en) * | 2018-02-08 | 2018-06-26 | 华南理工大学 | The preparation method and water pollutant of a kind of carbon dots modified metal organic backbone sorbing material administer application |
| WO2019229255A1 (en) | 2018-05-31 | 2019-12-05 | Cambridge Enterprise Limited | Photocatalyst and photocatalytic methods for producing hydrogen |
| CN109999882A (en) * | 2019-04-25 | 2019-07-12 | 湖南大学 | A kind of carbon quantum dot-graphite phase carbon nitride composite material, preparation method and application |
| CN110142838B (en) * | 2019-06-04 | 2020-11-20 | 北京林业大学 | Preparation method of phase change energy storage wood with carbon-coated metal filler |
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