CN110639520A - Silver-loaded modified strontium titanate catalyst, and preparation method and application thereof - Google Patents
Silver-loaded modified strontium titanate catalyst, and preparation method and application thereof Download PDFInfo
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- CN110639520A CN110639520A CN201910954344.9A CN201910954344A CN110639520A CN 110639520 A CN110639520 A CN 110639520A CN 201910954344 A CN201910954344 A CN 201910954344A CN 110639520 A CN110639520 A CN 110639520A
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- VEALVRVVWBQVSL-UHFFFAOYSA-N strontium titanate Chemical class [Sr+2].[O-][Ti]([O-])=O VEALVRVVWBQVSL-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 239000003054 catalyst Substances 0.000 title claims abstract description 38
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 26
- 239000004332 silver Substances 0.000 title claims abstract description 26
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 229910052769 Ytterbium Inorganic materials 0.000 claims abstract description 39
- 229910002370 SrTiO3 Inorganic materials 0.000 claims abstract description 34
- 239000002105 nanoparticle Substances 0.000 claims abstract description 32
- 229910052775 Thulium Inorganic materials 0.000 claims abstract description 23
- -1 ytterbium ion Chemical class 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 4
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 32
- STZCRXQWRGQSJD-GEEYTBSJSA-M methyl orange Chemical compound [Na+].C1=CC(N(C)C)=CC=C1\N=N\C1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-GEEYTBSJSA-M 0.000 claims description 22
- 229940012189 methyl orange Drugs 0.000 claims description 22
- 238000001782 photodegradation Methods 0.000 claims description 19
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical group [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims description 15
- 230000032683 aging Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 9
- 239000012190 activator Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 claims description 7
- 238000009210 therapy by ultrasound Methods 0.000 claims description 7
- 229910052724 xenon Inorganic materials 0.000 claims description 7
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 6
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 claims description 5
- 230000003213 activating effect Effects 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 239000012266 salt solution Substances 0.000 claims description 5
- 229910021577 Iron(II) chloride Inorganic materials 0.000 claims description 3
- 229910021626 Tin(II) chloride Inorganic materials 0.000 claims description 3
- 230000004913 activation Effects 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 3
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229910001961 silver nitrate Inorganic materials 0.000 claims description 2
- 229910052712 strontium Inorganic materials 0.000 claims description 2
- 239000011941 photocatalyst Substances 0.000 abstract 1
- 229910002367 SrTiO Inorganic materials 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 239000008367 deionised water Substances 0.000 description 11
- 229910021641 deionized water Inorganic materials 0.000 description 11
- 230000015556 catabolic process Effects 0.000 description 9
- 238000006731 degradation reaction Methods 0.000 description 9
- 239000002086 nanomaterial Substances 0.000 description 9
- 230000001699 photocatalysis Effects 0.000 description 9
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 9
- 239000002131 composite material Substances 0.000 description 8
- STZCRXQWRGQSJD-UHFFFAOYSA-M sodium;4-[[4-(dimethylamino)phenyl]diazenyl]benzenesulfonate Chemical compound [Na+].C1=CC(N(C)C)=CC=C1N=NC1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-UHFFFAOYSA-M 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 238000005303 weighing Methods 0.000 description 8
- 238000001035 drying Methods 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 238000003917 TEM image Methods 0.000 description 4
- 238000003760 magnetic stirring Methods 0.000 description 4
- 229910052697 platinum Inorganic materials 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000000862 absorption spectrum Methods 0.000 description 3
- 230000000593 degrading effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- ZIKATJAYWZUJPY-UHFFFAOYSA-N thulium (III) oxide Inorganic materials [O-2].[O-2].[O-2].[Tm+3].[Tm+3] ZIKATJAYWZUJPY-UHFFFAOYSA-N 0.000 description 2
- 101710134784 Agnoprotein Proteins 0.000 description 1
- 229910002621 H2PtCl6 Inorganic materials 0.000 description 1
- 229910004042 HAuCl4 Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000000527 sonication Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- LEDMRZGFZIAGGB-UHFFFAOYSA-L strontium carbonate Chemical compound [Sr+2].[O-]C([O-])=O LEDMRZGFZIAGGB-UHFFFAOYSA-L 0.000 description 1
- 229910000018 strontium carbonate Inorganic materials 0.000 description 1
- FIXNOXLJNSSSLJ-UHFFFAOYSA-N ytterbium(III) oxide Inorganic materials O=[Yb]O[Yb]=O FIXNOXLJNSSSLJ-UHFFFAOYSA-N 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
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/66—Silver or gold
-
- B01J35/396—
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
- C02F2101/40—Organic compounds containing sulfur
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
Abstract
The present disclosure provides a silver-loaded modified strontium titanate catalyst, a preparation method and applications thereof, wherein the catalyst is a silver-loaded nanoparticle on the surface of a modified strontium titanate nanoparticle, the modified strontium titanate nanoparticle is a ytterbium and thulium-doped strontium titanate nanoparticle, and the chemical formula is SrTiO3Yb and Tm, wherein Yb is trivalent ytterbium ion, and Tm is trivalent thulium ion. The catalyst provided by the present disclosure absorbs in the ultraviolet, visible and near infrared regions, thereby greatly increasing the SrTiO3The utilization efficiency of the photocatalyst.
Description
Technical Field
The disclosure relates to a silver-loaded modified strontium titanate catalyst, a preparation method and application thereof.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Strontium titanate (SrTiO)3) Has a typical perovskite structure, is an electronic functional ceramic material with wide application, has the advantages of high dielectric constant, low dielectric loss, good thermal stability and the like, and is widely applied to the electronic, mechanical and ceramic industries. Meanwhile, as a functional material, strontium titanate has the characteristics of high forbidden band width (3.2eV), excellent photocatalytic activity and the like, has unique electromagnetic property and redox catalytic activity, and is widely applied to the photocatalytic fields of photocatalytic hydrogen production through photocatalytic water decomposition, photocatalytic organic pollutant degradation, photochemical batteries and the like.
The solar light band is visible light region and red and ultraviolet region, however SrTiO3Only the ultraviolet part in sunlight can be absorbed, the utilization efficiency of light is low, and the photocatalytic efficiency is influenced.
Disclosure of Invention
In order to solve the defects of the prior art, the purpose of the present disclosure is to provide a silver-loaded modified strontium titanate catalyst, a preparation method and an application thereof, wherein the catalyst has absorption in ultraviolet, visible and near infrared regions, thereby greatly improving SrTiO3Efficiency of light utilization by the catalyst-like.
In order to achieve the purpose, the technical scheme of the disclosure is as follows:
on the one hand, the disclosure provides a silver-loaded modified strontium titanate catalyst, the surface of the modified strontium titanate nano-particle is loaded with silver nano-particles, the modified strontium titanate nano-particles are ytterbium and thulium-doped strontium titanate nano-particles, and the chemical formula is SrTiO3Yb and Tm, wherein Yb is trivalent ytterbium ion, and Tm is trivalent thulium ion.
The inventors of the present disclosure found in the previous studies that SrTiO was not suitable for the purpose of improving the quality of the product3Trivalent ytterbium ion and trivalent thulium ion are doped in the strontium titanate material, so that the absorption spectrum of the strontium titanate material can be expanded to an infrared region. However, such doping still does not make use of light in the visible region. Both the nano platinum and the nano gold can absorb visible light, however, experiments show that the nano platinum and the nano gold are difficult to load on the surface of the modified strontium titanate nano particles, and only the nano silver can be loaded on the modificationThe surface of strontium titanate nano-particles is proved to be SrTiO through experiments3The surface of Yb, Tm is loaded with silver nano-particles, so that the strontium titanate material can absorb in ultraviolet, visible and near infrared regions of an absorption spectrum.
On the other hand, the disclosure provides a preparation method of the silver-loaded modified strontium titanate catalyst, which comprises the steps of dispersing modified strontium titanate nanoparticles into an activator solution, carrying out ultrasonic activation, adding the activated material into a silver salt solution, stirring and aging to obtain the silver-loaded modified strontium titanate catalyst; wherein the activating agent is SnCl2Or FeCl2。
The modified strontium titanate nanoparticles adopted by the method have huge specific surface area, so that the modified strontium titanate nanoparticles have strong adsorbability, and an activating agent can activate the surfaces of the modified strontium titanate nanoparticles.
In a third aspect, the silver-loaded modified strontium titanate catalyst is applied to photodegradation of methyl orange.
In a fourth aspect, a method for photodegradation of methyl orange comprises adding the silver-loaded modified strontium titanate catalyst to an aqueous solution containing methyl orange for photodegradation.
The beneficial effect of this disclosure does:
the novel silver-loaded modified strontium titanate catalyst obtained by modifying Ag on the outer layer of the modified strontium titanate nanoparticles has higher photocatalytic activity. Compared with modified strontium titanate nanoparticles, the silver-loaded modified strontium titanate catalyst prepared by the method has higher photocatalytic activity.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
FIG. 1 shows SrTiO prepared in example 1 of the disclosure3Yb, Tm and SrTiO3The X-ray diffraction spectrum of the Yb, Tm @ Ag nano-catalytic composite material.
FIG. 2 shows SrTiO prepared in example 1 of the disclosure3Transmission electron microscope picture of Yb, Tm @ Ag nano catalytic composite material, (A) SrTiO3Transmission electron micrographs of Yb, Tm (scale bar 200nm in the figure); (B) SrTiO3Transmission electron micrographs of Yb, Tm (scale bar 200nm in the figure).
Fig. 3 is a transmission electron micrograph (scale bar 200nm) of a product prepared in example 5 of the present disclosure.
Fig. 4 is a transmission electron micrograph (scale bar 200nm) of a product prepared in example 6 of the present disclosure.
FIG. 5 is a graph showing the photo-degradation curve under 350W xenon lamp irradiation conditions for (A) SrTiO3Yb, Tm photodegradation graph, (B) SrTiO prepared in example 13Yb, Tm @ Ag photodegradation curve diagram.
FIG. 6 is a graph showing the photo-degradation curve of (A) SrTiO under 980nm laser irradiation3Yb, Tm photodegradation graph, (B) SrTiO prepared in example 13Yb, Tm @ Ag photodegradation curve diagram.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In view of SrTiO3Exist only absorbing sunlightThe invention provides a silver-loaded modified strontium titanate catalyst, a preparation method and application.
The invention provides a silver-loaded modified strontium titanate catalyst, which is characterized in that silver nanoparticles are loaded on the surface of modified strontium titanate nanoparticles, the modified strontium titanate nanoparticles are ytterbium and thulium-doped strontium titanate nanoparticles, and the chemical formula of the modified strontium titanate nanoparticles is SrTiO3Yb and Tm, wherein Yb is trivalent ytterbium ion, and Tm is trivalent thulium ion.
Experiments prove that the SrTiO provided by the disclosure3The surface of Yb, Tm is loaded with silver nano-particles, so that the strontium titanate material can absorb in ultraviolet, visible and near infrared regions of an absorption spectrum.
In one or more embodiments of this embodiment, the molar ratio of the elements Sr, Ti, Yb, Tm in the modified strontium titanate nanoparticles is 99:99:8/9: 1/9.
Another embodiment of the present disclosure provides a preparation method of the silver-loaded modified strontium titanate catalyst, in which modified strontium titanate nanoparticles are dispersed in an activator solution, ultrasonic activation is performed, the activated material is added into a silver salt solution, and stirring and aging are performed to obtain the silver-loaded modified strontium titanate catalyst; wherein the activating agent is SnCl2Or FeCl2。
The modified strontium titanate nanoparticles adopted by the method have huge specific surface area, so that the modified strontium titanate nanoparticles have strong adsorbability, and an activating agent can activate the surfaces of the modified strontium titanate nanoparticles.
The principle of the disclosure is as follows: the modified strontium titanate nano-particles have large surface area and can be activated, the metal activity of Ag is strong, and AgNO can be aged3；
The reaction formula is as follows:
SrTiO3:Yb,Tm-Mx++AgNO3→SrTiO3:Yb,Tm-Ag+M(NO3)x(Mx+cation as activator)
In one or more embodiments of this embodiment, the concentration of the activator in the activator solution is 5-10 mg/mL.
In one or more embodiments of this embodiment, the sonication time is 10-30 min.
In one or more embodiments, the silver salt is silver nitrate.
In one or more embodiments of this embodiment, the concentration of silver ions in the silver salt solution is 0.1 to 100 mg/mL.
In one or more embodiments of this embodiment, the aging time is 1 to 24 hours.
The disclosure provides a method for preparing modified strontium titanate nanoparticles, TiO2、SrCO3、Yb2O3、Tm2O3Grinding with NaCl, heating to 1000 deg.C or higher, and calcining.
In a third embodiment of the present disclosure, there is provided a use of the silver-supported modified strontium titanate catalyst in photodegradation of methyl orange.
In a fourth embodiment of the present disclosure, a method for photodegradation of methyl orange is provided, in which the silver-supported modified strontium titanate catalyst is added to an aqueous solution containing methyl orange for photodegradation.
In one or more embodiments of this embodiment, the light source for photodegradation is a 350W xenon lamp and/or a 980nm laser.
In order to make the technical solutions of the present disclosure more clearly understood by those skilled in the art, the technical solutions of the present disclosure will be described in detail below with reference to specific embodiments.
Examples SrTiO3Yb, Tm is prepared as follows:
(1) 319.32mg of TiO2、584.5752mg SrCO3、13.6mg Yb2O3、0.96415mg Tm2O3(in terms of SrTiO)3:Yb3+,Tm3+Molar ratio of 99:8/9: 1/9) into an agate mortar.
(2) 7.4436g of NaCl is added into the agate mortar in the step (1), and the mixture is ground in a cis-form for 20min, so that the raw materials are uniformly mixed.
(3) And (3) transferring the uniformly mixed raw materials in the step (2) into a platinum pot, and compacting.
(4) And (4) putting the platinum pot in the step (3) into a tubular furnace, and calcining for 3h at 1000 ℃.
(5) Cooling the calcined sample in the step (4) to room temperature by a tubular furnace program, taking out, ultrasonically cleaning the sample for 6 times by deionized water, centrifuging the sample, and drying the sample in an oven at the temperature of 60 ℃ overnight to obtain SrTiO3Yb, Tm, as shown in FIG. 2A.
Example 1:
(1) mixing nano material SrTiO3SnCl with Yb and Tm of 3mL and 5mg/mL2In the solution, ultrasonic treatment is carried out for 30min to ensure that SrTiO3Tm surface is fully activated;
(2) redispersing the solution obtained in step (1) in 3mL of 100mg/mL AgNO3Stirring and aging the solution for 1h, and then performing centrifugal separation;
(3) rinsing the compound obtained in the step (2) with deionized water for several times, and drying to obtain SrTiO3Yb, Tm @ Ag nano-catalytic composite material. TEM dispersed in ethanol is shown in FIG. 2B, and XRD analysis of the nanomaterials is shown in FIG. 1.
(4) Nano SrTiO prepared in the step (3)3Weighing 20mg of Yb, Tm @ Ag as a catalyst for degrading methyl orange by 350W xenon lamp light.
(5) Weighing 10mg of methyl orange, dissolving the methyl orange into 1L of deionized water, and preparing a methyl orange solution with the concentration of 10 mg/L. 60mL of the solution was taken and placed in a beaker for use.
(6) And (3) dissolving the catalyst weighed in the step (4) into the methyl orange solution in the step (5), keeping out of the sun, and carrying out magnetic stirring adsorption for 30 min.
(7) And (4) placing the solution adsorbed in the step (6) under a 350W xenon lamp, taking a sample once within 20min, and testing the degradation effect by using an ultraviolet spectrophotometer. The test results are shown in fig. 5B, and the degradation rate after 3h is 41.6%. The modified nano material has obviously improved photocatalytic performance.
Example 2:
(1) mixing nano material SrTiO3SnCl with Yb and Tm of 3mL and 5mg/mL2In the solution, performing ultrasonic treatment for 10min to ensure that SrTiO3Tm surface is fully activated;
(2) redispersing the solution obtained in step (1) in 3mL of 100mg/mL AgNO3Stirring and aging the solution for 1h, and then performing centrifugal separation;
(3) rinsing the compound obtained in the step (2) with deionized water for several times, and drying to obtain SrTiO3Yb, Tm @ Ag nano-catalytic composite material.
Example 3:
(1) mixing nano material SrTiO3SnCl with Yb and Tm of 3mL and 5mg/mL2In the solution, ultrasonic treatment is carried out for 30min to ensure that SrTiO3Tm surface is fully activated;
(2) redispersing the solution obtained in step (1) in 3mL of 100mg/mL AgNO3Stirring and aging the solution for 24 hours, and then performing centrifugal separation;
(3) rinsing the compound obtained in the step (2) with deionized water for several times, and drying to obtain SrTiO3Yb, Tm @ Ag nano-catalytic composite material.
Example 4:
(1) mixing nano material SrTiO3FeCl with Yb and Tm of 3mL and 5mg/mL2In the solution, ultrasonic treatment is carried out for 30min to ensure that SrTiO3Tm surface is fully activated;
(2) redispersing the solution obtained in step (1) in 3mL of 100mg/mL AgNO3Stirring and aging the solution for 1h, and then performing centrifugal separation;
(3) rinsing the compound obtained in the step (2) with deionized water for several times, and drying to obtain SrTiO3Yb, Tm @ Ag nano-catalytic composite material.
Example 5:
(1) mixing nano material SrTiO3SnCl with Yb and Tm of 3mL and 5mg/mL2In the solution, ultrasonic treatment is carried out for 30min to ensure that SrTiO3Tm surface is fully activated;
(2) will step withThe solution obtained in step (1) was redispersed in 3mL of 0.01M HAuCl4Stirring and aging the solution for 1h, and then performing centrifugal separation;
(3) rinsing the compound obtained in the step (2) with deionized water for several times, and drying to obtain the product. TEM dispersed in ethanol as in fig. 3, did not carry Au, indicating that the composite was not successfully prepared.
Example 6:
(1) mixing nano material SrTiO3SnCl with Yb and Tm of 3mL and 5mg/mL2In the solution, ultrasonic treatment is carried out for 30min to ensure that SrTiO3Tm surface is fully activated;
(2) redispersing the solution obtained in step (1) in 3mL of 0.1M H2PtCl6Stirring and aging the solution for 1h, and then performing centrifugal separation;
(3) rinsing the compound obtained in the step (2) with deionized water for several times, and drying to obtain the product. TEM dispersed in ethanol was not loaded with Pt as shown in fig. 4, indicating that the composite was not successfully prepared.
Example 7:
(1) the prepared nano SrTiO3Weighing 20mg of catalyst for degrading methyl orange by 350W xenon lamp light in Yb and Tm;
(2) weighing 10mg of methyl orange, dissolving the methyl orange into 1L of deionized water, and preparing a methyl orange solution with the concentration of 10 mg/L. Placing 60mL of the mixture in a beaker for later use;
(3) dissolving the catalyst weighed in the step (1) in the methyl orange solution in the step (2), keeping out of the sun, and carrying out magnetic stirring adsorption for 30 min;
(4) and (4) placing the solution well adsorbed in the step (3) under a 350W xenon lamp, taking a sample once within 20min, and testing the degradation effect by using an ultraviolet spectrophotometer. The test results are shown in FIG. 5A, and the degradation rate after 3h is 21%.
Example 8:
(1) the prepared nano SrTiO3Weighing 3mg of catalyst for photo-degrading methyl orange by using a 980nm laser.
(2) Weighing 8mg of methyl orange, and dissolving the methyl orange into 1L of deionized water to prepare a methyl orange solution with the concentration of 8 mg/L. 4mL of the solution was placed in a quartz glass dish for use.
(3) And (3) dissolving the catalyst weighed in the step (1) into the methyl orange solution in the step (2), keeping out of the sun, and carrying out magnetic stirring adsorption for 30 min.
(4) And (4) placing the solution adsorbed in the step (3) under a 980nm laser, taking a sample for 10min, and testing the degradation effect by using an ultraviolet spectrophotometer. The test results are shown in FIG. 6A, and the degradation rate after 1h is 11.4%.
Example 9:
(1) nano SrTiO prepared in the embodiment (1)3Weighing 3mg of Yb, Tm @ Ag as a catalyst for degrading methyl orange by using a 980nm laser.
(2) Weighing 8mg of methyl orange, dissolving the methyl orange into 1L of deionized water, and preparing a methyl orange solution with the concentration of 8 mg/mL. 4mL of the solution was placed in a quartz glass dish for use.
(3) And (3) dissolving the catalyst weighed in the step (1) into the methyl orange solution in the step (2), keeping out of the sun, and carrying out magnetic stirring adsorption for 30 min.
(4) And (4) placing the solution adsorbed in the step (3) under a 980nm laser, taking a sample for 10min, and testing the degradation effect by using an ultraviolet spectrophotometer. The test results are shown in fig. 6B, and the degradation rate after 1h is 15.3%. Therefore, the modified nano material has better photodegradation performance.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. The silver-loaded modified strontium titanate catalyst is characterized in that silver nanoparticles are loaded on the surfaces of modified strontium titanate nanoparticles, the modified strontium titanate nanoparticles are ytterbium and thulium-doped strontium titanate nanoparticles, and the chemical formula of the modified strontium titanate nanoparticles is SrTiO3Yb and Tm, wherein Yb is trivalent ytterbium ion, and Tm is trivalent thulium ion.
2. The silver-loaded modified strontium titanate catalyst of claim 1, wherein the modified strontium titanate nanoparticles have a molar ratio of Sr, Ti, Yb, Tm elements of 99:99:8/9: 1/9.
3. A preparation method of the silver-loaded modified strontium titanate catalyst of claim 1 or 2, which is characterized in that modified strontium titanate nanoparticles are dispersed into an activator solution, ultrasonic activation is carried out, the activated material is added into a silver salt solution, and stirring and aging are carried out to obtain the silver-loaded modified strontium titanate catalyst; wherein the activating agent is SnCl2Or FeCl2。
4. The method of claim 3, wherein the concentration of the activator in the activator solution is 5 to 10 mg/mL.
5. The method for preparing the silver-loaded modified strontium titanate catalyst according to claim 3, wherein the ultrasonic treatment time is 10 to 30 min.
6. The method for producing a silver-supported modified strontium titanate catalyst according to claim 3, wherein the silver salt is silver nitrate;
or the concentration of silver ions in the silver salt solution is 0.1-100 mg/mL.
7. The method for preparing a silver-loaded modified strontium titanate catalyst according to claim 3, wherein the aging time is 1 to 24 hours.
8. Use of the silver-loaded modified strontium titanate catalyst of claim 1 or 2 in photodegradation of methyl orange.
9. A method for photodegradation of methyl orange, characterized in that the silver-supported modified strontium titanate catalyst according to claim 1 or 2 is added to an aqueous solution containing methyl orange to effect photodegradation.
10. The method for photodegradation of methyl orange according to claim 9, wherein the light source for photodegradation is a 350W xenon lamp and/or a 980nm laser.
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