CN114425330B - Double noble metal loaded nano titanium dioxide and preparation method and application thereof - Google Patents
Double noble metal loaded nano titanium dioxide and preparation method and application thereof Download PDFInfo
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- CN114425330B CN114425330B CN202210044390.7A CN202210044390A CN114425330B CN 114425330 B CN114425330 B CN 114425330B CN 202210044390 A CN202210044390 A CN 202210044390A CN 114425330 B CN114425330 B CN 114425330B
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- 229910000510 noble metal Inorganic materials 0.000 title claims abstract description 45
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 76
- 229910010413 TiO 2 Inorganic materials 0.000 claims abstract description 37
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000013033 photocatalytic degradation reaction Methods 0.000 claims abstract description 14
- 238000011068 loading method Methods 0.000 claims abstract description 13
- 229910002696 Ag-Au Inorganic materials 0.000 claims abstract description 8
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- 239000002244 precipitate Substances 0.000 claims description 12
- 150000003839 salts Chemical class 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 8
- 238000001354 calcination Methods 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 6
- 229910052724 xenon Inorganic materials 0.000 claims description 5
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 5
- 101710134784 Agnoprotein Proteins 0.000 claims description 4
- 238000005286 illumination Methods 0.000 claims description 4
- 239000002082 metal nanoparticle Substances 0.000 claims description 4
- 239000010936 titanium Substances 0.000 claims description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000009210 therapy by ultrasound Methods 0.000 claims description 3
- 239000012498 ultrapure water Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 239000011259 mixed solution Substances 0.000 claims description 2
- 239000006228 supernatant Substances 0.000 claims description 2
- 238000002604 ultrasonography Methods 0.000 claims 1
- 230000001699 photocatalysis Effects 0.000 abstract description 19
- 239000000463 material Substances 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 9
- 229910052697 platinum Inorganic materials 0.000 abstract description 8
- 229910052737 gold Inorganic materials 0.000 abstract description 7
- 238000007540 photo-reduction reaction Methods 0.000 abstract description 7
- 239000003054 catalyst Substances 0.000 abstract description 5
- 239000000758 substrate Substances 0.000 abstract description 3
- 238000005979 thermal decomposition reaction Methods 0.000 abstract description 2
- 239000002923 metal particle Substances 0.000 abstract 1
- 239000002105 nanoparticle Substances 0.000 abstract 1
- 230000002194 synthesizing effect Effects 0.000 abstract 1
- 239000011941 photocatalyst Substances 0.000 description 10
- 230000015556 catabolic process Effects 0.000 description 8
- 238000006731 degradation reaction Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 239000000178 monomer Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 239000008098 formaldehyde solution Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 238000007146 photocatalysis Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000000862 absorption spectrum Methods 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000031700 light absorption Effects 0.000 description 2
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000013032 photocatalytic reaction Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000005070 sampling 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
- 230000032900 absorption of visible light Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000004298 light response Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 238000000634 powder X-ray diffraction Methods 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000001308 synthesis method Methods 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
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/48—Silver or gold
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- 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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- 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
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/48—Silver or gold
- B01J23/50—Silver
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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
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/48—Silver or gold
- B01J23/52—Gold
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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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/40—Catalysts, in general, characterised by their form or physical properties characterised by dimensions, e.g. grain size
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D2255/802—Photocatalytic
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- Health & Medical Sciences (AREA)
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Abstract
The invention discloses a preparation method and application of double noble metal loaded nano titanium dioxide, wherein the base material of the catalyst is nano TiO 2 And loading double noble metal particles Au-Pt, ag-Pt and Ag-Au on the surface of the substrate material. Firstly, synthesizing nano TiO by using thermal decomposition method 2 As a carrier, and then obtaining the product Au-Pt/TiO by a photoreduction loading mode 2 、Ag‑Pt/TiO 2 And Ag-Au/TiO 2 . The preparation method is simple and easy to operate, and the synthesized A-B/TiO 2 The (A, B=Au, ag, pt) nano particles have strong photocatalytic activity and stability, and have excellent performance in photocatalytic degradation of formaldehyde.
Description
Technical Field
The invention belongs to the technical field of new energy and photocatalytic materials, and particularly relates to a double-noble metal loaded nano titanium dioxide and a preparation method and application thereof.
Background
The nanometer semiconductor photocatalysis technology is one new technology for eliminating environment pollutant and has been paid great attention to, and the nanometer semiconductor photocatalysis technology is one effective indoor pollutant eliminating method based on photocatalysis principle. In the publicTiO in the photocatalytic material with multiple visible light responses 2 Is recognized as the optimal catalyst for photocatalytic reaction, and is widely applied in the fields of wide sources, low price, easy preparation, no toxicity, high photocatalytic activity and good stability. Under the illumination condition, tiO 2 Can convert formaldehyde pollutant into CO 2 And H 2 O. But TiO 2 The bulk still has the problems of slow photogenerated carrier migration rate and fast recombination rate, so that further modification is still needed, and one of the problems is to load a high-efficiency noble metal cocatalyst. In recent years, people belong to TiO by loading single noble metal 2 The method has a certain result in formaldehyde degradation, but the nano TiO is supported by a double noble metal promoter 2 The effect of degradation has been rarely studied.
Disclosure of Invention
The invention aims at the problems and provides a double noble metal supported photocatalytic material A-B/TiO 2 (a, b=au, ag, pt), the material has excellent activity in photocatalytic degradation of formaldehyde.
The technical scheme of the invention is as follows:
the preparation method of the double noble metal loaded nano titanium dioxide comprises the following steps:
(1) First Ti (SO) 4 Dissolving in deionized water, uniformly stirring, filtering under reduced pressure, taking the clarified solution at the lower layer, and slowly dripping ammonia water until the maximum precipitate is generated; centrifugally washing the precipitate with high-purity water and ethanol respectively until the supernatant is turbid, and finally calcining the obtained precipitate in a muffle furnace to obtain white nano TiO 2 Powder;
(2) TiO is mixed with 2 Dispersing the powder in a mixed solution of deionized water and methanol, completely dispersing by ultrasonic treatment, adding two noble metal salts, and respectively reducing the noble metal salts into noble metal nano particles and attaching the noble metal nano particles to TiO under the irradiation of light 2 The surface of the powder is obtained, the nano titanium dioxide loaded by the double noble metals is washed and precipitated by deionized water and ethanol, and the precipitate is dried for standby.
Further, the Ti (SO) 4 And deionized water in a mass ratio of 5-20:100；
Further, in the step (1), the calcining temperature is 500-700 ℃; the calcination time is 1-4h.
Further, the noble metal salt is HAuCl 4 ·3H 2 O、H 2 PtCl 6 ·6H 2 O and AgNO 3 Two of which are described below.
Further, in the step (2), the volume ratio of deionized water to methanol is 4:1, a step of;
further, after noble metal salt is added, the ultrasonic time is 10-30min;
further, in the step (2), a noble metal salt and TiO 2 The dosage of (C) is 100mg TiO 2 Loaded with 0.5-2mg of noble metal.
Further, in the step (2), the illumination condition is a 300W xenon lamp equipped with an AM1.5G filter.
The double noble metal loaded nano titanium dioxide prepared by the preparation method comprises Au-Pt/TiO 2 、Ag-Pt/TiO 2 And/or Ag-Au/TiO 2 。
The double noble metal loaded nano titanium dioxide is mainly applied to photocatalytic degradation of formaldehyde.
The beneficial effects of the invention are as follows:
1. in the prior art, single noble metal is usually loaded and belongs to TiO 2 On the contrary, the Au-Pt/TiO prepared by the invention 2 、Ag-Pt/TiO 2 And Ag-Au/TiO 2 The photocatalytic material shows excellent photocatalytic formaldehyde degradation activity, and the formaldehyde degradation rate can reach 3.28,2.5 g and 2.66g respectively -1 min -1 . Experimental study shows that Au-Pt/TiO 2 、Ag-Pt/TiO 2 And Ag-Au/TiO 2 The photocatalyst has good photocatalytic performance and can reach higher degradation under the irradiation of visible light. The photocatalytic explanation formaldehyde efficiency is TiO 2 8.6,6.6,7.0 times the monomer.
2. The preparation and synthesis method of the photocatalytic material has simple conditions and has higher commercial application prospect. The method of the invention is used for preparing the TiO loaded with the double noble metals 2 The size is not greatly changed, and the noble metal is loaded on the TiO in small particles of 2-4nm 2 The obtained double noble metal loaded nano titanium dioxide has good dispersity, small size and uniformity.
3. A-B/TiO prepared by a method of photoreduction loading 2 The (A, B=Au, ag, pt) photocatalyst is used for photocatalytic degradation of formaldehyde, and the catalyst has good photocatalytic stability through a circulation experiment. The three kinds of double noble metals can be used as good promoters for photocatalytic degradation of formaldehyde.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate and explain the exemplary embodiments of the disclosure and together with the description serve to explain the disclosure, and do not constitute an undue limitation on the disclosure.
Embodiments of the present disclosure are described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 is an X-ray powder diffraction pattern of a sample and standard card prepared in accordance with the present invention;
FIG. 2 is a graph showing the light absorption spectrum of a sample prepared according to the present invention;
FIG. 3 is a HRTEM (high resolution transmission electron microscope) spectrum and EDS (X-ray energy spectrum) of a sample prepared according to the present invention;
FIG. 4 shows a sample and TiO according to the invention 2 The monomer is used for photocatalytic degradation of formaldehyde activity comparison curve graph;
FIG. 5 shows a sample and TiO according to the invention 2 The monomer is used for photocatalytic degradation of formaldehyde activity versus a histogram;
FIG. 6 shows a sample and TiO according to the invention 2 The stability comparison chart of the monomer for photocatalytic degradation of formaldehyde.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention is further described with reference to the drawings and examples of implementation.
The invention relates to TiO supported by double noble metals A-B (A, B=Au, ag and Pt) 2 The composite photocatalytic material, wherein the loading mode of A-B (A, B=Au, ag and Pt) is photoreduction loading, and finally the A-B/TiO is obtained 2 The (A, B=Au, ag, pt) composite photocatalyst has the advantages of small particle size (5-10 nm), uniform dispersion, excellent performance, good chemical stability and the like.
Example 1:
(1) Firstly, preparing nano TiO by adopting a thermal decomposition method 2 ：
Firstly, 100ml of water is measured by a measuring cylinder and poured into a 150ml beaker, and 11.5200g of Ti (SO) is weighed 4 Stirring into uniform water solution in the beaker containing water, vacuum filtering, collecting clarified solution, and slowly dripping ammonia water at 20d/min until maximum precipitate is formed. Centrifugally washing the precipitate with high-purity water and ethanol for 3-4 times respectively until the upper layer solution is clarified, and calcining the obtained precipitate in a muffle furnace at 600deg.C for 3 hr (heating rate of 5 deg.C/min) to obtain white nanometer TiO 2 And (3) powder.
(2) Secondly, preparing nano TiO loaded by double noble metals 2 And (3) a photocatalyst:
Au-Pt/TiO 2 is prepared by photoreduction of the load. After 40ml of deionized water and 10ml of methanol were weighed into a beaker, 100mgTiO was added 2 Completely dispersing the powder in the solution by ultrasonic treatment, adding 2.0mg of HAuCl under stirring 4 ·3H 2 O and 2.7. 2.7mgH 2 PtCl 6 ·6H 2 O, ultrasonic for 20min, and stirring under 300W xenon lamp light equipped with AM1.5G filter for 15min. After stirring, the precipitate is centrifugally washed by deionized water and ethanol, and dried for standby.
Ag-Pt/TiO 2 And Ag-Au/TiO 2 Are prepared by the same photoreduction load, except that the metal precursor is changed to AgNO 3 And H 2 PtCl 6 ·6H 2 O、AgNO 3 And HAuCl 4 ·3H 2 O。
The method for testing the photocatalytic activity of the prepared material in example 1 is as follows:
the photocatalytic degradation of formaldehyde test was carried out in a formaldehyde detection reactor (volume: 250 ml) system (atmospheric pressure) closed with circulating cooling water (25 ℃). The top-illuminated light source was a 300W xenon lamp equipped with an AM1.5G filter, using the relative concentration of formaldehyde (C/C 0 ) To evaluate the photocatalytic activity of the sample. 50mg of the sample was weighed and dispersed in a petri dish and placed on a fixed bed of the reactor. Before the photocatalytic reaction test, the air in the reactor is removed by argon, 50 microliters of formaldehyde solution is dripped into the reactor, the reactor is sealed, an infrared photoelectrochromatograph is preheated, the temperature is stabilized at 50+/-0.1 ℃ for about 4 hours, the formaldehyde solution is completely volatilized, and the formaldehyde gas concentration in the reactor reaches a peak value. After light is transmitted, an instrument automatic sampling switch is turned on, the instrument automatically samples every 3 parts of 28 seconds to analyze formaldehyde concentration, and the testing instrument is an infrared photo chromatograph. The stability of the prepared photocatalyst is carried out by a cyclic test, and the specific method is as follows: and (3) removing gas in the reactor by using argon again after degradation is finished, dropwise adding formaldehyde solution, sealing the reactor, volatilizing the formaldehyde solution at the same temperature, and sampling by illumination again to test. This cycle test was performed four times in total.
FIG. 1 shows TiO before and after loading for example 2 As can be seen from FIG. 1, the synthesized TiO 2 The phase is anatase pure phase, no other phase peak appears, and the A-B/TiO is obtained after loading 2 The (a, b=au, ag, pt) product did not show a significant diffraction peak of a-B (a, b=au, ag, pt), which may be caused by too small a loading and good particle dispersion, and no impurity peak of other substances was introduced.
FIG. 2 shows the UV-visible diffuse reflection absorption spectrum of the photocatalyst obtained in the example, as can be seen from FIG. 2, pure TiO 2 Is located at 387nm in the visible region, the corresponding band gap is 3.2eV. In TiO 2 After the double noble metals Au, ag and Pt are loaded, the catalyst can be found to obviously enhance the absorption of visible light due to the special plasma resonance effect of the Au, ag and Pt, and the promotion of the light absorption is generally accompanied with the improvement of the photocatalytic performance.
FIG. 3 is a drawingExamples the products A-B/TiO 2 (a, b=au, ag, pt) HRTEM and EDS plots, tiO from plot HRTEM 2 The size is about 5-10nm, and TiO is carried by double noble metals 2 The size is not greatly changed, and the noble metal is loaded on the TiO in small particles of 2-4nm 2 Is a surface of the substrate. As can be seen from the EDS diagram, ti, O, ag, au and Pt elements exist, which indicates that Ag, au and Pt are supported on TiO 2 Is a surface of the substrate.
FIGS. 4 and 5 show A-B/TiO prepared by the method of photo-reduction loading 2 As can be seen from fig. 4 and 5, the curves of the (a, b=au, ag, pt) photocatalyst for photocatalytic degradation of formaldehyde show that under visible light, tiO 2 The average formaldehyde degradation rate per minute of the monomer is 0.38g -1 While Au-Pt/TiO 2 、Ag-Pt/TiO 2 And Ag-Au/TiO 2 The average formaldehyde degradation rate of the photocatalyst per minute is 3.28,2.5 and 2.66g respectively -1 The photocatalyst activity after loading the double noble metals can be found to be obviously higher than that of TiO 2 The monomers were each about 8.6,6.6,7.0 times as large as the monomers.
FIG. 6 shows an example of A-B/TiO prepared by a photo-reduction loading method 2 Stability curves of (a, b=au, ag, pt) photocatalyst for photocatalytic degradation of formaldehyde, as can be seen from fig. 6, a-B/TiO after four cycles 2 The activity of (a, b=au, ag, pt) did not decay significantly after four cycles, indicating good photocatalytic stability of the catalyst. These results all indicate that these three double noble metals can be used as good promoters for photocatalytic degradation of formaldehyde.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (6)
1. The application of the double noble metal loaded nano titanium dioxide in photocatalytic degradation of formaldehyde is characterized in that the double noble metal loaded nano titanium dioxide comprises Au-Pt/TiO 2 、Ag-Pt/TiO 2 Or Ag-Au/TiO 2 ；
The preparation method of the double noble metal loaded nano titanium dioxide comprises the following steps:
(1) First, ti (SO) 4 ) 2 Dissolving in deionized water, uniformly stirring, filtering under reduced pressure, taking the clarified solution at the lower layer, and slowly dripping ammonia water until the maximum precipitate is generated; centrifugally washing the precipitate with high-purity water and ethanol respectively until the supernatant is turbid, and finally calcining the obtained precipitate in a muffle furnace to obtain white nano TiO2 powder;
(2) TiO is mixed with 2 Dispersing the powder in a mixed solution of deionized water and methanol, completely dispersing by ultrasonic treatment, adding two noble metal salts, and respectively reducing the noble metal salts into noble metal nano particles and attaching the noble metal nano particles to TiO under the irradiation of light 2 The surface of the powder is obtained, the nano titanium dioxide loaded by the double noble metals is washed and precipitated by deionized water and ethanol, and the precipitate is dried for standby;
wherein the noble metal salt is HAuCl 4 ·3H 2 O、H 2 PtCl 6 ·6H 2 O and AgNO 3 Two of (a) and (b); noble metal salts and TiO 2 The dosage of (C) is 100mg TiO 2 Loading 0.5-2mg of noble metal;
the photocatalytic degradation of formaldehyde is performed in a formaldehyde detection reactor system with a circulating cooling water seal connected, and a 300W xenon lamp with an AM1.5G filter arranged at the top of the reactor system is used as a light source for irradiation.
2. The use according to claim 1, wherein in step (1), the Ti (SO 4 ) 2 And deionized water in a mass ratio of 5-20:100.
3. the use according to claim 1, wherein in step (1) the calcination temperature is 500-700 ℃; the calcination time is 1-4h.
4. The use according to claim 1, wherein in step (2), the volume ratio of deionized water to methanol is 4:1.
5. the use according to claim 1, wherein in step (2) the ultrasound time is 10-30min after the addition of the noble metal salt.
6. The use according to claim 1, wherein in step (2) the illumination condition is a 300W xenon lamp fitted with an AM1.5G filter.
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| CN116020447A (en) * | 2022-11-30 | 2023-04-28 | 电子科技大学长三角研究院(湖州) | Titanium oxide-based photocatalytic formaldehyde removal photocatalyst with carrier separation structure and preparation method thereof |
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| CN104549368A (en) * | 2015-01-28 | 2015-04-29 | 山东大学 | Preparation method of load bimetal type Cu-Pt/TiO2-NBs catalyst and application |
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| CN106861626A (en) * | 2017-01-16 | 2017-06-20 | 华南理工大学 | A kind of adsorption photochemical catalysis bifunctional material and preparation method thereof and the application in VOC Processing tecchnics |
| CN107456983A (en) * | 2017-07-17 | 2017-12-12 | 山东大学 | A kind of Ag/AgCl/TiO2Composite photocatalyst material and its preparation method and application |
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