CN111167434A - Photocatalytic composite material Cr for degrading gaseous pollutants2O3-SnO2And preparation method and application thereof - Google Patents
Photocatalytic composite material Cr for degrading gaseous pollutants2O3-SnO2And preparation method and application thereof Download PDFInfo
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- CN111167434A CN111167434A CN202010093142.2A CN202010093142A CN111167434A CN 111167434 A CN111167434 A CN 111167434A CN 202010093142 A CN202010093142 A CN 202010093142A CN 111167434 A CN111167434 A CN 111167434A
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- 230000001699 photocatalysis Effects 0.000 title claims abstract description 37
- 239000002131 composite material Substances 0.000 title claims abstract description 34
- 230000000593 degrading effect Effects 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- XOLBLPGZBRYERU-UHFFFAOYSA-N SnO2 Inorganic materials O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000011651 chromium Substances 0.000 claims abstract description 48
- 239000011941 photocatalyst Substances 0.000 claims abstract description 37
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 31
- 231100000719 pollutant Toxicity 0.000 claims abstract description 16
- 239000002243 precursor Substances 0.000 claims abstract description 13
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical class [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000001354 calcination Methods 0.000 claims abstract description 11
- 239000003054 catalyst Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 9
- 229910021626 Tin(II) chloride Inorganic materials 0.000 claims abstract description 7
- 150000001844 chromium Chemical class 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000000227 grinding Methods 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
- 239000011261 inert gas Substances 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims abstract description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical group CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 18
- 230000003197 catalytic effect Effects 0.000 claims description 9
- 238000006731 degradation reaction Methods 0.000 claims description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 5
- 230000015556 catabolic process Effects 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- GVHCUJZTWMCYJM-UHFFFAOYSA-N chromium(3+);trinitrate;nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Cr+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O GVHCUJZTWMCYJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000000356 contaminant Substances 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- 238000005286 illumination Methods 0.000 claims description 3
- YJBKVPRVZAQTPY-UHFFFAOYSA-J tetrachlorostannane;dihydrate Chemical group O.O.Cl[Sn](Cl)(Cl)Cl YJBKVPRVZAQTPY-UHFFFAOYSA-J 0.000 claims description 3
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- LJAOOBNHPFKCDR-UHFFFAOYSA-K chromium(3+) trichloride hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].[Cl-].[Cl-].[Cr+3] LJAOOBNHPFKCDR-UHFFFAOYSA-K 0.000 claims description 2
- ZSPCEEBYANPQIX-UHFFFAOYSA-H chromium(3+) trisulfate pentahydrate Chemical compound O.O.O.O.O.S(=O)(=O)([O-])[O-].[Cr+3].S(=O)(=O)([O-])[O-].S(=O)(=O)([O-])[O-].[Cr+3] ZSPCEEBYANPQIX-UHFFFAOYSA-H 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 239000000243 solution Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 12
- 238000005215 recombination Methods 0.000 abstract description 4
- 230000006798 recombination Effects 0.000 abstract description 3
- 238000002156 mixing Methods 0.000 abstract 1
- QDOXWKRWXJOMAK-UHFFFAOYSA-N chromium(III) oxide Inorganic materials O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 19
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 10
- 230000000694 effects Effects 0.000 description 4
- 229910052718 tin Inorganic materials 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000002114 nanocomposite Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 238000007146 photocatalysis Methods 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910001887 tin oxide Inorganic materials 0.000 description 2
- WXNZTHHGJRFXKQ-UHFFFAOYSA-N 4-chlorophenol Chemical group OC1=CC=C(Cl)C=C1 WXNZTHHGJRFXKQ-UHFFFAOYSA-N 0.000 description 1
- 229910003321 CoFe Inorganic materials 0.000 description 1
- 229910021627 Tin(IV) chloride Inorganic materials 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012018 catalyst precursor Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- CXKWCBBOMKCUKX-UHFFFAOYSA-M methylene blue Chemical compound [Cl-].C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 CXKWCBBOMKCUKX-UHFFFAOYSA-M 0.000 description 1
- 229960000907 methylthioninium chloride Drugs 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002048 multi walled nanotube Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
-
- 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
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/26—Chromium
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/27—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation
- C07C45/32—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen
- C07C45/37—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of >C—O—functional groups to >C=O groups
- C07C45/39—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of >C—O—functional groups to >C=O groups being a secondary hydroxyl group
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- Health & Medical Sciences (AREA)
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Abstract
The invention belongs to the technical field of photocatalytic materials, and particularly discloses a photocatalytic composite material Cr for degrading gaseous pollutants2O3‑SnO2The preparation method and the application thereof are as follows: mixing chromium salt and tin salt in a certain molar ratio in deionized water, continuously stirring for 0.5-3h, and drying to obtain a precursor of the catalyst. Placing the precursor in a crucible, calcining under the condition of inert gas or air, wherein the calcining temperature is 300-800 ℃, the calcining time is 1-4h, and naturallyCooling to room temperature, and grinding to obtain the composite photocatalytic material Cr2O3‑SnO2. Cr prepared by the method of the invention2O3‑SnO2The composite photocatalyst can effectively separate electron hole pairs, reduce the recombination rate of the electron holes, further effectively improve the photocatalytic activity and achieve the purpose of efficiently degrading gaseous pollutants.
Description
Technical Field
The invention belongs to the technical field of photocatalytic materials, and particularly relates to a composite material Cr for photocatalytic degradation of gaseous pollutants2O3-SnO2And a preparation method and application thereof.
Background
With the development of human society and the continuous progress of economy, the combustion of fuel causes a series of serious environmental problems, and gaseous pollution is always regarded as one of the most serious environmental problems threatening human survival, and so far, people have taken different methods to solve the problems. The photocatalysis technology is a sustainable development and environment-friendly technology, realizes the degradation of gaseous pollutants by utilizing sunlight, and has the characteristics of no secondary pollution, cyclic regeneration and the like.
Cr2O3The catalyst is a very promising catalytic material, has high chemical and thermal stability, and is mainly applied to industrial refractory materials, high-temperature oxidation-resistant substances and high-performance gas sensors. The publication of Ceramics International reports CuO/Cr2O3Research on the photocatalytic activity of the co-loaded multi-walled carbon nanotube; CoFe was reported in Journal of Molecular Catalysis ACheical2O4-Cr2O3-SiO2Degrading methylene blue in water by the photocatalysis of the fluorescent magnetic nano composite material; journal of Materials Science reports Cr under visible light2O3-CNT/TiO2Synthesis and photocatalytic behavior of the composite material; the Journal of Environmental Sciences reported newly developed Fe3O4-Cr2O3The magnetic nano composite material is used for photocatalytic decomposition of 4-chlorophenol in water. Albeit Cr2O3The photocatalytic composite material Cr can be used for the experiment of catalytic degradation of pollutants, but can efficiently degrade gaseous pollutants2O3-SnO2There are no reports yet.
Cr2O3In the case of p-type semiconductors, the catalytic activity is low because electrons or holes are easily recombined. SnO2As a kind ofn-type semiconductor, Cr2O3With SnO2Recombination forms a heterojunction, recombination of electrons or holes can be overcome, catalytic activity can be improved, and therefore, Cr2O3-SnO2Composite photocatalysts are one of the most promising catalysts.
Disclosure of Invention
The invention aims to provide a composite photocatalyst Cr for degrading gaseous pollutants2O3-SnO2The preparation method and the application thereof. The method has the advantages of simplicity, convenience, easily controlled experiment conditions and the like.
In order to achieve the purpose, the invention adopts the following technical scheme: photocatalytic composite material Cr for degrading gaseous pollutants2O3-SnO2The preparation method comprises the following steps:
1) dissolving chromium salt and tin salt in deionized water solution, stirring and maintaining for 0.5-3h to obtain mixed solution containing chromium and tin;
2) putting the mixed solution containing chromium and tin into an oven for drying to obtain a precursor;
3) calcining the precursor obtained in the step 2) under the condition of inert gas or air, cooling to room temperature, and grinding to obtain the composite photocatalyst Cr2O3-SnO2。
Preferably, the photocatalytic composite material Cr for degrading gaseous pollutants2O3-SnO2In the step 1), the chromium salt is one of chromium nitrate nonahydrate, chromium chloride hexahydrate or chromium sulfate pentahydrate.
Preferably, the photocatalytic composite material Cr for degrading gaseous pollutants2O3-SnO2In the step 1), the tin salt is tin chloride dihydrate or tin chloride.
Preferably, the photocatalytic composite material Cr for degrading gaseous pollutants2O3-SnO2And in the step 1), the molar ratio of the chromium salt to the tin salt is 1: 1.
Preferably, a light for degrading gaseous pollutants as described aboveCatalytic composite material Cr2O3-SnO2And the drying process in the step 2) is drying for 1-15 hours at 50-150 ℃.
Preferably, the photocatalytic composite material Cr for degrading gaseous pollutants2O3-SnO2And 3) the inert gas in the step 3) is nitrogen or argon.
Preferably, the photocatalytic composite material Cr for degrading gaseous pollutants2O3-SnO2And in the step 3), the temperature rising speed is 1-10 ℃/min, and the calcination is carried out for 1-4h at the temperature of 300-800 ℃.
The photocatalytic composite material Cr for degrading gaseous pollutants2O3-SnO2The application of the catalyst in the catalytic degradation of gaseous pollutants under visible light.
Preferably, for the above-mentioned application, the gaseous contaminant is isopropanol.
Preferably, the above application, method is as follows: the photocatalytic composite material Cr is added into a sealed reaction container containing gaseous pollutants2O3-SnO2And catalytically degrading gaseous pollutants under illumination.
The invention has the beneficial effects that:
1. the invention provides Cr2O3-SnO2The composite structure of the photocatalyst can more easily and effectively separate photoproduction electrons and holes, reduce the recombination rate and effectively improve the photocatalytic activity.
2. The invention provides Cr2O3-SnO2The preparation method of the composite photocatalyst has the advantages of cheap and easily-obtained raw materials, simple and convenient operation, greatly reduced cost and good development prospect.
3. The invention provides Cr2O3-SnO2The composite photocatalyst has the rate of degrading isopropanol to produce acetone under visible light, namely Cr2O3And SnO2About 6 and 6.7 times.
Drawings
FIG. 1(a) shows pure Cr prepared in example 12O3XRD pattern of photocatalyst.
FIG. 1(b) is pure SnO prepared in example 12XRD pattern of photocatalyst.
FIG. 2 shows the 500-SCr photocatalyst prepared in example 2 and pure Cr2O3Pure SnO2XRD testing of photocatalyst comparison.
FIG. 3 is an SEM image of a 500-SCr photocatalyst prepared in example 2.
FIG. 4 is a mapping image of the 500-SCr photocatalyst prepared in example 2; wherein a is a graph of the oxygen element content, b is a graph of the chromium element content, c is a graph of the tin element content, and d is a mapping graph of the total element content of the 500-SCr photocatalyst.
FIG. 5 is a comparative UV-vis plot of 400-SCr photocatalyst, 500-SCr photocatalyst, and 600-SCr photocatalyst prepared in example 2.
FIG. 6 shows pure Cr prepared2O3Photocatalyst, pure SnO2The activities of the photocatalyst, 400-SCr photocatalyst, 500-SCr photocatalyst and 600-SCr photocatalyst for degrading isopropanol gas are compared.
Detailed Description
Example 1 photocatalyst Cr capable of degrading organic contaminants2O3、SnO2
(I) preparation method
Respectively dissolving 4.0g of chromium nitrate nonahydrate and 2.25g of stannic chloride dihydrate in 100mL of deionized water, fully stirring, putting into an oven for drying at 100 ℃ for 10h, and respectively obtaining Cr2O3Precursor, SnO2A precursor.
Respectively adding Cr2O3Precursor, SnO2The precursor is placed in a muffle furnace to be calcined for 2 hours at 500 ℃, and is ground after being cooled to room temperature to obtain the catalyst Cr capable of degrading gaseous pollutants2O3And SnO2。
(II) detection
FIG. 1 shows a photocatalytic material Cr prepared in example 12O3、SnO2The XRD pattern of the sample is shown in figure 1(a) and is determined at 24.6 degrees, 33.73 degrees, 36.31 degrees, 41.69 degrees,Seven diffraction peaks at 50.03 deg., 55.0 deg. and 65.31 deg. are Cr2O3Characteristic peak of (1), pure Cr2O3The diffraction peak of the photocatalytic material sample is completely consistent with the peak spectrum of the chromium oxide standard card, which indicates that the prepared pure Cr2O3The photocatalytic material is actually chromium sesquioxide; as can be seen from FIG. 1(b), the sample has five diffraction peaks at 26.65 °, 33.88 °, 51.78 °, 54.78 ° and 65.98 °, and is SnO2Characteristic peak of (1), pure SnO2The diffraction peak of the photocatalytic material sample is completely consistent with the peak spectrum of the tin oxide standard card, which shows that the prepared pure SnO2The photocatalytic material is indeed tin oxide.
Example 2 photocatalyst Cr capable of degrading gaseous contaminants2O3/SnO2
(I) preparation method
4.0g of chromium nitrate nonahydrate and 2.25g of tin chloride dihydrate are dissolved in 100mL of deionized water, and the mixture is placed into an oven for drying at 100 ℃ for 10 hours after being fully stirred, so that a catalyst precursor is obtained.
And calcining the precursor in a muffle furnace at 400 ℃ for 2h, cooling to room temperature, and grinding to obtain the catalyst 400-SCr capable of degrading organic pollutants.
And calcining the precursor in a muffle furnace at 500 ℃ for 2h, cooling to room temperature, and grinding to obtain the catalyst 500-SCr capable of degrading organic pollutants.
And calcining the precursor in a muffle furnace at 600 ℃ for 2h, cooling to room temperature, and grinding to obtain the catalyst 600-SCr capable of degrading gaseous pollutants.
(II) detection
FIG. 2 shows 500-SCr prepared in example 2 and pure Cr prepared in example 12O3Pure SnO2As can be seen from FIG. 2, sample 500-SCr has diffraction peaks at 24.6 °, 26.65 °, 33.73 °, 33.88 °, 36.31 °, 41.69 °, 51.78 ° and 65.98 °, and pure Cr2O3Pure SnO2The characteristic peaks are similar, and the successful synthesis of 500-SCr is proved.
FIG. 3 is an SEM image of the 500-SCr photocatalyst prepared in example 2, and FIG. 4 is a corresponding mapping image, from which it can be clearly seen that the surface morphology of the composite catalyst is an irregular sheet structure and the distribution is very uniform and dense. Further, it can be seen that the alloy contains three elements of Cr, Sn and O.
FIG. 5 is a graph showing the comparison of UV-vs of 400-SCr photocatalyst and 500-SCr photocatalyst 600-SCr photocatalyst prepared in example 2, in which the light absorption range of 500-SCr photocatalyst is the largest, and then 600-SCr photocatalyst and 400-SCr photocatalyst, illustrating that the catalytic activity of 500-SCr photocatalyst is the best.
Example 3 application
The different photocatalysts prepared in the examples 1 and 2 were subjected to photocatalytic performance tests.
The test process is as follows: using a 300W xenon lamp as a light source, adjusting the photocurrent to be 20A, adjusting the light intensity center to irradiate the surface of the sample, fixing the position, and respectively preparing pure Cr2O3Pure SnO2400-SCr, 500-SCr, and 600-SCr placed at 4cm2In the glass tank, the glass tank carrying the photocatalyst is respectively placed into a 224mL reactor containing atmospheric air, finally 5ul of isopropanol liquid is injected into the reactor, timing is started after the reactor is placed for 1h, a needle is drawn out every 5 minutes for a sample to be tested, the peak area of acetone generated by isopropanol degradation is recorded, and the result is that the rate of acetone generated per minute is calculated after 6 times of recording (illumination for 30 minutes) as shown in FIG. 6.
As can be seen from FIG. 6, pure Cr was produced2O3Pure SnO2Degradation isopropanol rate activity plots per minute for 400-SCr, 500-SCr, and 600-SCr. It can be seen that Cr is produced2O3-SnO2The catalytic activity ratio of the photocatalyst Cr2O3、SnO2The activity is much higher, and the rate of degrading isopropanol to generate acetone is about 6 times and 6.7 times of the rate of the isopropanol to generate acetone. Furthermore, the activity of the 500-SCr sample is higher than that of 400-SCr and 600-SCr, and 500 ℃ is proved to be the optimal calcination temperature of the catalyst. Thus, it can be said that the prepared Cr2O3-SnO2The photocatalyst is more beneficial to the separation of photogenerated electron holes, and can provide higher catalytic activity.
Claims (10)
1. Photocatalytic composite material Cr for degrading gaseous pollutants2O3-SnO2The preparation method is characterized by comprising the following steps:
1) dissolving chromium salt and tin salt in deionized water solution, stirring and maintaining for 0.5-3h to obtain mixed solution containing chromium and tin;
2) putting the mixed solution containing chromium and tin into an oven for drying to obtain a precursor;
3) calcining the precursor obtained in the step 2) under the condition of inert gas or air, cooling to room temperature, and grinding to obtain the composite photocatalyst Cr2O3-SnO2。
2. The photocatalytic composite material Cr for degrading gaseous pollutants as claimed in claim 12O3-SnO2The method is characterized in that in the step 1), the chromium salt is one of chromium nitrate nonahydrate, chromium chloride hexahydrate or chromium sulfate pentahydrate.
3. The photocatalytic composite material Cr for degrading gaseous pollutants as claimed in claim 12O3-SnO2The method is characterized in that in the step 1), the tin salt is tin chloride dihydrate or tin chloride.
4. The photocatalytic composite material Cr for degrading gaseous pollutants as claimed in claim 12O3-SnO2The method is characterized in that in the step 1), the molar ratio of the chromium salt to the tin salt is 1: 1.
5. The photocatalytic composite material Cr for degrading gaseous pollutants as claimed in claim 12O3-SnO2The method is characterized in that the drying process in the step 2) is drying for 1-15 hours at 50-150 ℃.
6. The photocatalytic composite material Cr for degrading gaseous pollutants as claimed in claim 12O3-SnO2The method is characterized in that the inert gas in the step 3) is nitrogen or argon.
7. The photocatalytic composite material Cr for degrading gaseous pollutants as claimed in claim 12O3-SnO2And is characterized in that in the step 3), the temperature rise speed is 1-10 ℃/min, and the calcination is carried out for 1-4h at the temperature of 300-800 ℃.
8. The photocatalytic composite material Cr for degrading gaseous pollutants as claimed in claim 12O3-SnO2The application of the catalyst in the catalytic degradation of gaseous pollutants under visible light.
9. The use of claim 8, wherein the gaseous contaminant is isopropanol.
10. Use according to claim 8, characterized in that the method is as follows: the photocatalytic composite material Cr of claim 1 is added into a sealed reaction vessel containing gaseous pollutants2O3-SnO2And catalytically degrading gaseous pollutants under illumination.
Priority Applications (1)
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