CN108212159A - Fe2O3 doping carbon quantum dot/titanium dioxide composite photocatalyst prepares and the method for degradation of formaldehyde - Google Patents
Fe2O3 doping carbon quantum dot/titanium dioxide composite photocatalyst prepares and the method for degradation of formaldehyde Download PDFInfo
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 149
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 title claims abstract description 83
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 239000004408 titanium dioxide Substances 0.000 title claims abstract description 63
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 239000002131 composite material Substances 0.000 title claims abstract description 41
- 230000015556 catabolic process Effects 0.000 title claims abstract description 33
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 33
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000001699 photocatalysis Effects 0.000 claims abstract description 24
- 239000003054 catalyst Substances 0.000 claims abstract description 21
- 238000002360 preparation method Methods 0.000 claims abstract description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000007146 photocatalysis Methods 0.000 claims abstract description 15
- 230000000694 effects Effects 0.000 claims abstract description 11
- 229910052742 iron Inorganic materials 0.000 claims abstract description 8
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims abstract 2
- 239000000463 material Substances 0.000 claims description 13
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 8
- 238000001291 vacuum drying Methods 0.000 claims description 8
- 238000005119 centrifugation Methods 0.000 claims description 7
- 238000002835 absorbance Methods 0.000 claims description 6
- ZLXPLDLEBORRPT-UHFFFAOYSA-M [NH4+].[Fe+].[O-]S([O-])(=O)=O Chemical class [NH4+].[Fe+].[O-]S([O-])(=O)=O ZLXPLDLEBORRPT-UHFFFAOYSA-M 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 238000001354 calcination Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 235000015165 citric acid Nutrition 0.000 claims description 4
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid group Chemical class C(CC(O)(C(=O)O)CC(=O)O)(=O)O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 4
- 150000002171 ethylene diamines Chemical class 0.000 claims description 4
- 238000000703 high-speed centrifugation Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 4
- 239000006228 supernatant Substances 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 229910052724 xenon Inorganic materials 0.000 claims description 3
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 2
- 230000003197 catalytic effect Effects 0.000 abstract description 6
- 238000005036 potential barrier Methods 0.000 abstract description 3
- 238000012546 transfer Methods 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 10
- 239000002086 nanomaterial Substances 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002957 persistent organic pollutant Substances 0.000 description 3
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 241000790917 Dioxys <bee> Species 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229930040373 Paraformaldehyde Natural products 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005297 material degradation process Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 229920002866 paraformaldehyde Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- HORQAOAYAYGIBM-UHFFFAOYSA-N 2,4-dinitrophenylhydrazine Chemical compound NNC1=CC=C([N+]([O-])=O)C=C1[N+]([O-])=O HORQAOAYAYGIBM-UHFFFAOYSA-N 0.000 description 1
- 229910003334 KNbO3 Inorganic materials 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- DKUYEPUUXLQPPX-UHFFFAOYSA-N dibismuth;molybdenum;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Mo].[Mo].[Bi+3].[Bi+3] DKUYEPUUXLQPPX-UHFFFAOYSA-N 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005191 phase separation 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
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 230000000280 vitalizing effect Effects 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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/74—Iron group metals
- B01J23/745—Iron
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D3/00—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances
- A62D3/10—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by subjecting to electric or wave energy or particle or ionizing radiation
- A62D3/17—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by subjecting to electric or wave energy or particle or ionizing radiation to electromagnetic radiation, e.g. emitted by a laser
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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
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/063—Titanium; Oxides or hydroxides thereof
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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
- B01J35/19—Catalysts containing parts with different compositions
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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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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D2101/00—Harmful chemical substances made harmless, or less harmful, by effecting chemical change
- A62D2101/20—Organic substances
- A62D2101/28—Organic substances containing oxygen, sulfur, selenium or tellurium, i.e. chalcogen
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Abstract
The invention discloses the method for Fe2O3 doping carbon quantum dot/titanium dioxide composite photocatalyst degradation of formaldehyde, preparation method includes（1）The preparation of Fe2O3 doping carbon quantum dot；（2）The preparation of Fe2O3 doping carbon quantum dot/titanium dioxide composite photocatalyst.The degradation of formaldehyde photocatalysis performance is carried out to the Fe2O3 doping carbon quantum dot/titanium dioxide composite photocatalyst prepared using visible ray.The present invention builds Fe2O3 doping carbon quantum dot using interfacial charge transfer effect, Fe2O3 doping is conducive to be promoted the photocatalytic activity of Fe2O3 doping carbon quantum dot/titanium dioxide composite photocatalyst, it is since the doping of iron reduces the work content of carbon quantum dot, cause to form very big potential barrier between Fe2O3 doping carbon quantum dot and titanium dioxide, promote the photocatalysis performance of Fe2O3 doping carbon quantum dot/titanium dioxide.The introducing of Fe2O3 doping carbon quantum dot significantly improves the catalytic performance of titanium dioxide under visible light, it is seen that after light irradiates 180 min, formaldehyde（Concentration is in 3 30 mg/L）Degradation rate 40% rise to more than 85% when by titanium dioxide being catalyst.
Description
Technical field
The invention belongs to chemical technology fields, are specifically related to titanic oxide composite photochemical catalyst system and prepare and its apply.
Background technology
Titanium dioxide has many unique advantages, including stable chemical property, photoelectrochemical behaviour；Resistance to photoetch；
To biological nontoxic；Abundance；It is a kind of efficient photochemical catalyst, therefore often uses it for the degradation of organic pollution, air
Purification, sterilization and demister.But due to titanium dioxide greater band gap be 3.2ev, generally can only the shorter ultraviolet light of absorbing wavelength,
Therefore the utilization rate of solar energy is very low and only 3%~5%；And since light excites the compound of the electron hole generated, lead to light quantity
Sub- efficiency is low so that the application of semiconductor light-catalyst is restricted.
Studies have found that carbon nanomaterial can be used as electronic memory to capture electronics, so as to prevent the weight of electron hole pair
Group.And the upper converting photoluminescent performance of some carbon nanomaterials such as carbon quantum dot can make it absorb the light of long wavelength and send out
Penetrating the light of short wavelength constantly can form electron hole pair by vitalizing semiconductor photochemical catalyst.So by carbon nanomaterial and semiconductor
Photochemical catalyst, which carries out compound raising catalytic efficiency, to have very big application prospect and meaning.
Patent of invention（Application number 201710146818.8）Disclose compound photocatalytic system CQDs-KNbO3And its system
Preparation Method and application provide the composite photocatalyst system CQDs-KNbO with Strong oxdiative reduction activation3, it can be achieved that visible
Hydrogen manufacturing while degradable organic pollutant under light irradiation；Patent of invention（Application number 201610344339.2）Disclose carbon quantum
The preparation method of point/bismuth molybdate nanometer sheet composite photocatalyst material, for degradable organic pollutant rhodamine B；Patent of invention（Shen
It please numbers 201510214659.1）A kind of preparation method of nitrogen-doped carbon quantum dot/composite titania material is disclosed, for light
Catalysis methanol decomposing hydrogen-production.These methods are directed to carbon quantum dot and TiO2And metal combine prepare compound photocatalysis material
Material, for organic pollutant degradation or hydrogen manufacturing.Although formaldehyde structure simply is easy to eliminate, it discharges slow, it is therefore desirable to
Catalyst used is with good stability, and the utilization ratio of light is also to perplex the importance of present photocatalysis effect.
The present invention is using the Fe2O3 doping carbon quantum dot of interfacial charge transfer effect structure, and existing carbon nanomaterial is in photocatalysis
In advantage, and have advantage of the metallic iron in photocatalysis.Fe2O3 doping is conducive to promote Fe2O3 doping carbon quantum dot/titanium dioxide
Photocatalytic activity, be since the doping of iron reduces the work content of carbon quantum dot, cause Fe2O3 doping carbon quantum dot and titanium dioxide it
Between form very big potential barrier, promote the photocatalysis performance of Fe2O3 doping carbon quantum dot/titanium dioxide, improve formaldehyde catalysis drop
Solve effect.Preparing material, degradation rate is high under visible light, and degradation of formaldehyde concentration range is wide, and degradation time is short, and material is easily and liquid
The advantages that body separation, material can reuse.
Invention content
It prepares the object of the present invention is to provide Fe2O3 doping carbon quantum dot/titanium dioxide composite photocatalyst and degradation of formaldehyde
Method, by the use of Fe2O3 doping carbon quantum dot as the sensitizer of titanium dioxide, preparing one kind under visible light can effective degradation of formaldehyde
Composite photocatalyst system.
The purpose of the present invention is achieved by the following technical programs：
Unless otherwise indicated, percentage of the present invention is weight percent.
Fe2O3 doping carbon quantum dot/titanium dioxide composite photocatalyst prepares and the method for degradation of formaldehyde.It is characterized in that, system
Preparation Method includes the following steps：
（1）The preparation of Fe2O3 doping carbon quantum dot：10-15g citric acids are weighed, 1-3g iron ammonium sulfates are dissolved in 50-100mL pure water
In, add 5-10mL ethylenediamines, ultrasonic 10-20min makes its abundant mixing, be transferred to polytetrafluoroethyllining lining reaction kettle in
200 DEG C are heated 5-7h, are filtered after natural cooling with 8000r/min high speed centrifugations 15-25min removing large granular impurities, excessively 0.22 μm
Obtain the Fe2O3 doping carbon quantum dot of blue-fluorescence after film, drying for standby in 60 DEG C of vacuum drying chambers.
（2）The preparation of titanium dioxide：2-4g titania powders are weighed, 0.2-0.5g CTAB are scattered in 50mL pure water,
Mechanical agitation 4-6h is placed on drying in 60 DEG C of vacuum drying chambers, and dried powder is calcined 4-6h to eliminate in 400 DEG C
The negative electrical charge building-up effect of titanium dioxide surface, titanium dioxide after must calcining.
（3）The preparation of titanium dioxide/carbon quantum dot composite photo-catalyst：Weigh above-mentioned burnt titania powder 1-
2g is scattered in the Fe2O3 doping carbon quantum dot solution of a concentration of 2.5mg/mL of 20-30mL, is stirred at room temperature for 24 hours, 5000r/min
It centrifuges 10-15min and removes supernatant, with pure water 3-5 time, after 60 DEG C are dried in vacuo, obtain Fe2O3 doping carbon quantum dot/bis-
Titanium oxide composite photo-catalyst.
The titanium dioxide is titanium dioxide P25.
The Degradation Formaldehyde method is：Composite catalyst prepared by step 1 is scattered in the 50mL aqueous solutions containing formaldehyde
In, it is protected from light stirring 2-3h under confined conditions to reach the adsorption equilibrium of material, it is seen that light irradiates, and it is real to carry out degradation under stiring
It tests.5mL solution is taken out every half an hour, catalyst is removed with 5000r/min centrifugations 10-15min, adds 50-100 μ L bulking values
Than the acetonitrile solution for 0.05%2,4- dinitrophenylhydrazines as derivating agent, 60 DEG C of water-bath 15-20min are surveyed at wavelength 355nm
Determine absorbance value, calculate photocatalytic activity, degradation photocatalysis performance is evaluated.
The visible ray includes one of xenon source of the power in 300-350W, LED light source kind, irradiation time
150-200 min。
The formalin concentration is in 3-30 mg/L.
Relative to the prior art, the present invention has following remarkable advantage：
1st, Fe2O3 doping carbon quantum dot/titanium dioxide complex system prepared by the present invention, Fe2O3 doping carbon quantum dot therein, existing carbon
Advantage of the nano material in photocatalysis, and have advantage of the metallic iron in photocatalysis, showing the doping of iron reduces carbon amounts
The work content of son point, causes to form very big potential barrier between Fe2O3 doping carbon quantum dot and titanium dioxide, makes Fe2O3 doping carbon quantum dot/bis-
The photocatalysis performance of titanium oxide is promoted, and improves the catalytic degradation effect of formaldehyde.
2nd, prepare optic catalytic composite material degradation of formaldehyde under visible light, degradation rate is high, and degradation time is short, material easily with
The advantages that liquid separation, material can reuse.
3rd, the Fe2O3 doping carbon quantum dot/titanic oxide composite photochemical catalyst material degradation of formaldehyde concentration range prepared is wide, can be with
It promotes the use of in the photocatalytic degradation for producing formaldehydogenic furniture, floor and metope etc..
Specific embodiment
The present invention is further described, but protection scope of the present invention is not limited to this with reference to embodiment.
Embodiment 1：
1st, the preparation of Fe2O3 doping carbon quantum dot：10g citric acids are weighed, 1g iron ammonium sulfates are dissolved in 50 mL pure water, add
5mL ethylenediamines, ultrasonic 10min make its abundant mixing, are transferred to polytetrafluoroethyllining lining reaction kettle and 5h is heated in 200 DEG C, natural
Large granular impurity is removed with 8000r/min high speed centrifugations 15min after cooling, the iron that blue-fluorescence is obtained after 0.22 μm of filter membrane excessively is mixed
Miscellaneous carbon quantum dot, drying for standby in 60 DEG C of vacuum drying chambers.
2nd, the preparation of titanium dioxide：2gP25 titania powders are weighed, 0.2g CTAB are scattered in 50mL pure water, machinery
Stirring 4h is placed on drying in 60 DEG C of vacuum drying chambers, and dried powder is calcined 4h to eliminate titanium dioxide in 400 DEG C
The negative electrical charge building-up effect on surface, titanium dioxide after must calcining.
3rd, the preparation of titanium dioxide/carbon quantum dot composite photo-catalyst：Above-mentioned burnt titania powder 1g is weighed,
It is scattered in the Fe2O3 doping carbon quantum dot solution of a concentration of 2.5mg/mL of 20mL, stirs at room temperature for 24 hours, 5000r/min centrifugations
10min removes supernatant, with pure water 3-5 time, after 60 DEG C are dried in vacuo, obtains Fe2O3 doping carbon quantum dot/titanium dioxide
Composite photo-catalyst.
4th, photocatalysis performance is tested
Composite catalyst prepared by step 3 is scattered in the 50mL aqueous solutions of the formaldehyde containing 3mg/L, is protected from light stirs under confined conditions
2h is mixed to reach the adsorption equilibrium of material, opens the xenon long-arc lamp illumination of 300W, with fan cooling keep room temperature, under stiring into
Row degradation experiment.5mL solution is taken out every half an hour, catalyst is removed with 5000r/min centrifugations 10-15min, adds 50-100 μ L
W/v is the acetonitrile solution of 0.05%2,4- dinitrophenylhydrazines as derivating agent, 60 DEG C of water-bath 15-20min, in wavelength
Absorbance value is measured at 355nm, calculates photocatalytic activity, degradation photocatalysis performance is evaluated.Photocatalytic degradation efficiency
（D）It is calculated as follows：D = （A0–A）/A0× 100%, wherein A0For the starting absorbance of formalin, A is photocatalytic degradation
The absorbance of formalin.Fe2O3 doping carbon quantum dot/titanium dioxide composite photocatalyst, carbon quantum dot/titanium dioxide complex light
Catalyst（It is identical with Fe2O3 doping carbon quantum dot/titanium dioxide composite photocatalyst preparation method, when preparing carbon quantum dot, only
It is not added with iron ammonium sulfate）, Fe2O3 doping carbon quantum dot and titanium dioxide degradable effect of formaldehyde see Fig. 1, in Fig. 1 it can be seen from pass through
Cross 3h illumination, Fe2O3 doping carbon quantum dot/titanium dioxide composite photocatalyst, carbon quantum dot/titanium dioxide composite photocatalyst and
The photocatalytic activity of titanium dioxide PARA FORMALDEHYDE PRILLS(91,95) is respectively 6.5%, 61.7% and 82.4%, and Fe2O3 doping carbon quantum dot/titanium dioxide is multiple
The catalytic effect of closing light catalyst system and catalyzing is substantially better than carbon quantum dot-titanium dioxide and titanium dioxide；Furthermore catalyst weight is carried out
It is tested again using number, as a result sees Fig. 2.
Embodiment 2：
1st, the preparation of Fe2O3 doping carbon quantum dot：15g citric acids are weighed, 3g iron ammonium sulfates are dissolved in 100mL pure water, add
10mL ethylenediamines, ultrasonic 20min make its abundant mixing, are transferred to polytetrafluoroethyllining lining reaction kettle and 7h is heated in 200 DEG C, natural
Large granular impurity is removed with 8000r/min high speed centrifugations 25min after cooling, the iron that blue-fluorescence is obtained after 0.22 μm of filter membrane excessively is mixed
Miscellaneous carbon quantum dot, drying for standby in 60 DEG C of vacuum drying chambers.
2nd, the preparation of titanium dioxide：4gP25 titania powders are weighed, 0.5g CTAB are scattered in 50mL pure water, machinery
Stirring 6h is placed on drying in 60 DEG C of vacuum drying chambers, and dried powder is calcined 6h to eliminate titanium dioxide in 400 DEG C
The negative electrical charge building-up effect on surface, titanium dioxide after must calcining.
3rd, the preparation of titanium dioxide/carbon quantum dot composite photo-catalyst：Above-mentioned burnt titania powder 2g is weighed,
It is scattered in the Fe2O3 doping carbon quantum dot solution of a concentration of 2.5mg/mL of 30mL, stirs at room temperature for 24 hours, 5000r/min centrifugations 10-
15min removes supernatant, with pure water 3-5 time, after 60 DEG C are dried in vacuo, obtains Fe2O3 doping carbon quantum dot/titanium dioxide
Composite photo-catalyst.
3rd, composite catalyst prepared by step 3 is scattered in the 50mL aqueous solutions of the formaldehyde containing 30mg/L, under confined conditions
Stirring 3h is protected from light to reach the adsorption equilibrium of material, the LED lamplight for opening 10W is shone, and carries out degradation experiment under stiring.Every half
Hour takes out 5mL solution, removes catalyst with 5000r/min centrifugations 10-15min, it is 0.05% to add 50-100 μ L w/vs
The acetonitrile solution of 2,4-dinitrophenylhydrazine measures absorbance as derivating agent, 60 DEG C of water-bath 15-20min at wavelength 355nm
Value calculates photocatalytic activity, and degradation photocatalysis performance is evaluated.Evaluation method is with embodiment 1, by that can be seen in Fig. 1
Go out, by 3h illumination, Fe2O3 doping carbon quantum dot/titanium dioxide composite photocatalyst, carbon quantum dot/titanic oxide composite photochemical catalyst
The photocatalytic activity of agent and titanium dioxide PARA FORMALDEHYDE PRILLS(91,95) is respectively 12.5%, 73.3% and 93.8%, Fe2O3 doping carbon quantum dot/dioxy
The catalytic effect for changing titanium composite photocatalyst system is substantially better than carbon quantum dot-titanium dioxide and titanium dioxide；As a result with embodiment 1
It is similar.
As can be seen from the above embodiments, Fe2O3 doping carbon quantum dot/titanic oxide composite photochemical catalyst body that prepared by the present invention
System, formaldehyde has the effect of good degradation to environmental pollutants, its degradation rate is than carbon quantum dot-titanium dioxide and dioxy under visible light
It is much higher to change titanium, while has the advantages that phase separation speed is fast, can repeatedly use.
Claims (5)
1. Fe2O3 doping carbon quantum dot/titanium dioxide composite photocatalyst prepares and the method for degradation of formaldehyde, which is characterized in that iron is mixed
Miscellaneous carbon quantum dot/titanium dioxide composite photocatalyst preparation method includes the following steps：
（1）The preparation of Fe2O3 doping carbon quantum dot：10-15g citric acids are weighed, 1-3g iron ammonium sulfates are dissolved in 50-100mL pure water
In, add 5-10mL ethylenediamines, ultrasonic 10-20min makes its abundant mixing, be transferred to polytetrafluoroethyllining lining reaction kettle in
200 DEG C are heated 5-7h, are filtered after natural cooling with 8000r/min high speed centrifugations 15-25min removing large granular impurities, excessively 0.22 μm
Obtain the Fe2O3 doping carbon quantum dot of blue-fluorescence after film, drying for standby in 60 DEG C of vacuum drying chambers；
（2）The preparation of titanium dioxide：2-4g titania powders are weighed, 0.2-0.5g CTAB are scattered in 50mL pure water, machine
Tool stirring 4-6h is placed on drying in 60 DEG C of vacuum drying chambers, and dried powder is calcined 4-6h to eliminate two in 400 DEG C
The negative electrical charge building-up effect of titania surface, titanium dioxide after must calcining；
（3）The preparation of titanium dioxide/carbon quantum dot composite photo-catalyst：Above-mentioned burnt titania powder 1-2g is weighed,
It is scattered in the Fe2O3 doping carbon quantum dot solution of a concentration of 2.5mg/mL of 20-30mL, stirs at room temperature for 24 hours, 5000r/min centrifugations
10-15min removes supernatant, with pure water 3-5 time, after 60 DEG C are dried in vacuo, obtains Fe2O3 doping carbon quantum dot/titanium dioxide
Titanium composite photo-catalyst.
2. the method for Fe2O3 doping carbon quantum dot/titanium dioxide composite photocatalyst degradation of formaldehyde according to claim 1,
It is characterized in that, it is characterised in that：The titanium dioxide is titanium dioxide P25.
3. the method for Fe2O3 doping carbon quantum dot/titanium dioxide composite photocatalyst degradation of formaldehyde according to claim 1,
It is characterized in that：The Degradation Formaldehyde method is：Composite catalyst prepared by step 1 is scattered in the 50mL aqueous solutions containing formaldehyde
In, it is protected from light stirring 2-3h under confined conditions to reach the adsorption equilibrium of material, it is seen that light irradiates, and it is real to carry out degradation under stiring
It tests；5mL solution is taken out every half an hour, catalyst is removed with 5000r/min centrifugations 10-15min, adds 50-100 μ L bulking values
Than the acetonitrile solution for 0.05%2,4- dinitrophenylhydrazines as derivating agent, 60 DEG C of water-bath 15-20min are surveyed at wavelength 355nm
Determine absorbance value, calculate photocatalytic activity, degradation photocatalysis performance is evaluated.
4. the method for Fe2O3 doping carbon quantum dot/titanium dioxide composite photocatalyst degradation of formaldehyde according to claim 3,
It is characterized in that, the visible ray includes one of xenon source of the power in 300-350W, LED light source kind, irradiation time and is
150-200 min。
5. the method for Fe2O3 doping carbon quantum dot/titanium dioxide composite photocatalyst degradation of formaldehyde according to claim 3,
It is characterized in that, the formalin concentration is in 3-30 mg/L.
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