CN107442146B - Silver phosphate/silver bromide heterojunction nanoparticles, preparation method and application thereof - Google Patents
Silver phosphate/silver bromide heterojunction nanoparticles, preparation method and application thereof Download PDFInfo
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- ADZWSOLPGZMUMY-UHFFFAOYSA-M silver bromide Chemical compound [Ag]Br ADZWSOLPGZMUMY-UHFFFAOYSA-M 0.000 title claims abstract description 49
- 229910000161 silver phosphate Inorganic materials 0.000 title claims abstract description 40
- 239000002105 nanoparticle Substances 0.000 title claims abstract description 29
- FJOLTQXXWSRAIX-UHFFFAOYSA-K silver phosphate Chemical compound [Ag+].[Ag+].[Ag+].[O-]P([O-])([O-])=O FJOLTQXXWSRAIX-UHFFFAOYSA-K 0.000 title claims abstract description 28
- 229940019931 silver phosphate Drugs 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000012046 mixed solvent Substances 0.000 claims abstract description 17
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 15
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 7
- 239000010452 phosphate Substances 0.000 claims abstract description 7
- 239000004094 surface-active agent Substances 0.000 claims abstract description 7
- 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 abstract description 6
- 230000002194 synthesizing effect Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 4
- 238000005342 ion exchange Methods 0.000 claims abstract description 3
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 23
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical group [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims description 12
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 10
- 239000000047 product Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- BTVWZWFKMIUSGS-UHFFFAOYSA-N dimethylethyleneglycol Natural products CC(C)(O)CO BTVWZWFKMIUSGS-UHFFFAOYSA-N 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 3
- RVGRUAULSDPKGF-UHFFFAOYSA-N Poloxamer Chemical compound C1CO1.CC1CO1 RVGRUAULSDPKGF-UHFFFAOYSA-N 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 229910000397 disodium phosphate Inorganic materials 0.000 claims description 3
- 235000019441 ethanol Nutrition 0.000 claims description 3
- 229960000502 poloxamer Drugs 0.000 claims description 3
- 229920001983 poloxamer Polymers 0.000 claims description 3
- 229920001223 polyethylene glycol Polymers 0.000 claims description 3
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 3
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 3
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 3
- 229910000162 sodium phosphate Inorganic materials 0.000 claims description 3
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 claims description 2
- 229910017677 NH4H2 Inorganic materials 0.000 claims description 2
- 239000007795 chemical reaction product Substances 0.000 claims description 2
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims description 2
- 229910000388 diammonium phosphate Inorganic materials 0.000 claims description 2
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical group [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims description 2
- 230000001699 photocatalysis Effects 0.000 abstract description 23
- 239000002131 composite material Substances 0.000 abstract description 12
- 239000002086 nanomaterial Substances 0.000 abstract description 9
- 239000002244 precipitate Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 239000011941 photocatalyst Substances 0.000 description 7
- 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 6
- 229940043267 rhodamine b Drugs 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 5
- 238000006731 degradation reaction Methods 0.000 description 5
- 239000000975 dye Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 5
- 238000005303 weighing Methods 0.000 description 5
- 238000007792 addition Methods 0.000 description 4
- JHJLBTNAGRQEKS-UHFFFAOYSA-M sodium bromide Chemical compound [Na+].[Br-] JHJLBTNAGRQEKS-UHFFFAOYSA-M 0.000 description 4
- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 229960000907 methylthioninium chloride Drugs 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229940012189 methyl orange Drugs 0.000 description 2
- 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 description 2
- 238000007146 photocatalysis Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000011206 ternary composite Substances 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- ZXSQEZNORDWBGZ-UHFFFAOYSA-N 1,3-dihydropyrrolo[2,3-b]pyridin-2-one Chemical compound C1=CN=C2NC(=O)CC2=C1 ZXSQEZNORDWBGZ-UHFFFAOYSA-N 0.000 description 1
- IAZDPXIOMUYVGZ-WFGJKAKNSA-N Dimethyl sulfoxide Chemical group [2H]C([2H])([2H])S(=O)C([2H])([2H])[2H] IAZDPXIOMUYVGZ-WFGJKAKNSA-N 0.000 description 1
- 238000003917 TEM image Methods 0.000 description 1
- 238000000026 X-ray photoelectron spectrum Methods 0.000 description 1
- PQXVNKLKIYXPDZ-UHFFFAOYSA-N [Ag]=S.[Mo](=S)=S Chemical compound [Ag]=S.[Mo](=S)=S PQXVNKLKIYXPDZ-UHFFFAOYSA-N 0.000 description 1
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 1
- 239000003242 anti bacterial agent Substances 0.000 description 1
- 229940088710 antibiotic agent Drugs 0.000 description 1
- 239000011218 binary composite Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000012295 chemical reaction liquid Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000004298 light response Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229910001958 silver carbonate Inorganic materials 0.000 description 1
- LKZMBDSASOBTPN-UHFFFAOYSA-L silver carbonate Substances [Ag].[O-]C([O-])=O LKZMBDSASOBTPN-UHFFFAOYSA-L 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/14—Phosphorus; Compounds thereof
- B01J27/16—Phosphorus; Compounds thereof containing oxygen, i.e. acids, anhydrides and their derivates with N, S, B or halogens without carriers or on carriers based on C, Si, Al or Zr; also salts of Si, Al and Zr
- B01J27/18—Phosphorus; Compounds thereof containing oxygen, i.e. acids, anhydrides and their derivates with N, S, B or halogens without carriers or on carriers based on C, Si, Al or Zr; also salts of Si, Al and Zr with metals other than Al or Zr
- B01J27/1802—Salts or mixtures of anhydrides with compounds of other metals than V, Nb, Ta, Cr, Mo, W, Mn, Tc, Re, e.g. phosphates, thiophosphates
- B01J27/1817—Salts or mixtures of anhydrides with compounds of other metals than V, Nb, Ta, Cr, Mo, W, Mn, Tc, Re, e.g. phosphates, thiophosphates with copper, silver or gold
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Abstract
The invention relates to a silver phosphate/silver bromide heterojunction nano-particle, a preparation method and application thereof, wherein the product is a nano-scale particle and has a heterojunction structure; the mass percentage of AgBr is 10-40 percent, and the balance is Ag3PO4. The preparation method comprises the following steps: (1) soluble silver salt and surfactant are dissolved in multi-component mixed solvent to form Ag+The solution is dripped with phosphate solution to react and synthesize Ag3PO4A nanoparticle; (2) introducing Br by adopting a dropwise adding mode‑And synthesizing the silver phosphate/silver bromide nanoparticles by an ion exchange mode. By Ag3PO4The composite nano material has the advantages of improving the photocatalytic performance and stability of the composite material by effectively matching with AgBr, along with low cost, simple process, high yield of the obtained composite nano material and higher photocatalytic efficiency.
Description
Technical Field
The invention relates to the field of nano materials, in particular to a composition, preparation and application of a silver phosphate/silver bromide heterojunction photocatalyst.
Background
With TiO2Semiconductor materials represented by ZnO, etc. have promoted the development of photocatalytic technology and are widely used in the environmental and energy fields. However, the forbidden band width of titanium dioxide is 3.2ev, only absorbs 4% -5% of ultraviolet light in the solar spectrum, the utilization rate of visible light is low, and the application of titanium dioxide in the field of photocatalysis is limited. Therefore, the development of visible light response photocatalytic materials with high catalytic performance and stability is the focus of research in the current photocatalytic field.
The silver-based photocatalytic material, typically a visible light responsive photocatalyst, is expected to become an important material for photocatalytic treatment of industrial wastewater due to efficient separation of electrons and holes. The inventor further improves the photocatalytic performance of the silver-based photocatalytic material by synthesizing a binary or ternary composite photocatalytic material in Chinese patent carbonitrides/silver carbonate/silver bromide ternary composite nano-materials, a preparation method and application thereof (CN106378170A) and a preparation method of molybdenum disulfide-silver sulfide composite nano-adsorption-photocatalyst (CN 105536684A). However, the stability of silver-based compounds, particularly the property of being easily decomposed by visible light, limits their practical applications.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a silver phosphate/silver bromide heterojunction nano material, a preparation method and application thereof, wherein Ag is used for preparing the nano material3PO4The composite nano material has the advantages of improving the photocatalytic performance and stability of the composite material by effectively matching with AgBr, along with low cost, simple process, high yield of the obtained composite nano material and higher photocatalytic efficiency.
The above purpose is realized by the following technical scheme:
a silver phosphate/silver bromide heterojunction nanoparticle is of a heterojunction structure; the mass percentage of AgBr is 10-40 percent, and the balance is Ag3PO4(ii) a Preferably, the mass percentage of AgBr is 20%.
The preparation method of the silver phosphate/silver bromide heterojunction nano-particles comprises the following steps:
(1) and (3) synthesizing silver phosphate: soluble silver salt is dissolved in multi-element mixed solvent to form Ag+Adding surfactant into the solution with the concentration of 0.5-2mol/L, and dropwise adding phosphate solution with the concentration of 0.5mol/L into the solution for reaction to synthesize Ag3PO4Nanoparticles of which PO is4 3-With Ag+The molar ratio is 1:3-1: 3.2.
(2) Synthesizing silver phosphate/silver bromide heterojunction nanoparticles: introducing Br into the solution in the step (1) in a dropwise manner-And the concentration is 0.2-1.5mol/L, silver phosphate/silver bromide nano-particles are synthesized by an ion exchange mode, wherein the mass percentage of AgBr is 10-40%, and the product is repeatedly washed by deionized water and absolute ethyl alcohol and dried to obtain a reaction product.
In the step (1), the soluble silver salt is AgNO3；
The phosphate is Na2HPO4、(NH4)2HPO4、NaH2PO4Or NH4H2PO4；
The multi-element mixed solvent is a binary mixed solvent of dimethyl sulfoxide and water, dimethyl sulfoxide and ethanol or dimethyl sulfoxide and ethylene glycol, and the volume ratio of the dimethyl sulfoxide to other solvents is (1: 1) - (1): 8.
the surfactant is polyvinylpyrrolidone, cetyl trimethyl ammonium bromide, polyethylene glycol or poloxamer, and the addition amount is 0.5-5 g/L, Br-Is a soluble bromide.
The silver phosphate/silver bromide heterojunction is used as a photocatalyst and applied to degradation of organic dyes, phenols, antibiotics and heavy metal ions in organic wastewater and degradation of organic pollutants in air.
The invention adopts a simple process to synthesize the silver phosphate/silver bromide heterojunction nano photocatalytic material with high photocatalytic performance, the obtained composite nano material has excellent photocatalytic performance and stability, the efficiency of degrading organic matters is improved by 20 percent, and the photocatalytic time is 10-15 min. And, by virtue of having important applications in the fields of photocatalysis, gas sensing, sewage treatment, etc., it is expected to be used for large-scale industrial production.
Drawings
FIG. 1 shows Ag prepared in accordance with the present invention3PO4XRD and XPS spectra of/AgBr heterojunction nanoparticles. FIG. 1a is the XRD pattern of the product, the presence of Ag in the silver phosphate/silver bromide complex3PO4And diffraction peaks of AgBr, and with standard Ag3PO4The cards (JCPDS Card No.06-0505) and the standard AgBr Card (JCPDS Card No.06-0438) were identical, demonstrating the formation of the composite product. Fig. 1b is an XPS survey of silver phosphate/silver bromide heterojunction nanoparticles, further demonstrating the presence of Ag, Br, P, O elements in the sample.
FIG. 2 shows Ag obtained in example 13PO4TEM image of/AgBr heterojunction nanoparticles, it can be seen that the product is a nanoscale particle, with Br-The dumbbell-shaped nano particles are generated, and the size of the dumbbell-shaped nano particles is about 100 nm.
FIG. 3 shows Ag prepared according to the present invention3PO4Curve for degradation of dye by AgBr heterojunction photocatalyst.The addition amounts of AgBr were 10%, 20%, 30%, and 40%, respectively. FIG. 3a shows Ag in different AgBr additions3PO4The photocatalytic result of the/AgBr heterojunction degradation composite photocatalyst for decomposing rhodamine B (RhB), and all Ag3PO4the/AgBr composite product has better photocatalytic performance, and particularly has better and excellent performance when the addition amount of AgBr is 20 percent. FIG. 3b is Ag3PO4the/AgBr heterojunction (20%) degrades curves of different dyes of Methylene Blue (MB), Methyl Orange (MO) and rhodamine B (RhB), and the degradation efficiency of the three dyes reaches over 75% in 10min, wherein the RhB and MB dyes are almost completely degraded, and the excellent photocatalytic performance is shown. FIG. 3c is Ag3PO4The result of a cycle experiment for degrading RhB by a/AgBr heterojunction shows that the prepared Ag3PO4the/AgBr composite photocatalyst still has very high photocatalytic performance after 5 photocatalytic experiments, which shows that the catalyst has very good stability.
Detailed Description
The present invention will be further described below by way of specific embodiments, and it is apparent from the technical knowledge that the present invention can be described by other means without departing from the technical features of the present invention, and therefore all changes within the scope of the present invention or the equivalent scope of the present invention are encompassed by the present invention.
All reagents used in the present invention are commercial products and are commercially available.
Example 1:
(1) weighing 1.69g AgNO3Dissolving in 90mL of mixed solvent of dimethyl sulfoxide and water (volume ratio of 1:2), adding 0.2g of hexadecyl trimethyl ammonium bromide, stirring vigorously to dissolve completely, adding 0.473g of Na2HPO4Dissolved in 10mL of the same mixed solvent, dropped dropwise into the above solution and stirred well for 1h until a pale yellow precipitate is produced.
(2) And weighing 0.721g of NaBr, dissolving in 10mL of the same mixed solvent, dropwise adding into the reaction liquid in the step (1), and violently stirring for 2h until the mixture is uniformly dispersed to obtain light green flocculent precipitate. And after standing and precipitating, washing and centrifuging the silver bromide nano particles for many times by using deionized water and absolute ethyl alcohol, and drying the silver bromide nano particles at 60 ℃ to obtain the silver phosphate/silver bromide heterojunction nano particles, wherein the yield is 98%, the silver phosphate content is 20%, and the balance is silver bromide.
Example 2:
(1) weighing 1.69g AgNO3Dissolving in 90mL mixed solvent of dimethyl sulfoxide and ethanol (volume ratio of 1:1), adding 0.2g polyethylene glycol, stirring vigorously to dissolve completely, and adding 0.361g NaH2PO4Dissolved in 10mL of the same mixed solvent, dropped dropwise into the above solution and stirred well for 1h until a pale yellow precipitate is produced.
(2) Weighing 2.4g of KBr, dissolving in 10mL of the same mixed solvent, dropwise adding into the reaction solution obtained in the step (1), and violently stirring for 2 hours until the mixture is uniformly dispersed to obtain light green flocculent precipitate. And standing for precipitation, washing and centrifuging the precipitate for multiple times by using deionized water and absolute ethyl alcohol, and drying at 60 ℃ to obtain the silver phosphate/silver bromide heterojunction nano-particles. The yield is 97%, the content of silver phosphate is 30%, and the balance is silver bromide.
Example 3:
(1) weighing 1.69g AgNO3Dissolving in 90mL mixed solvent of dimethyl sulfoxide and ethylene glycol (volume ratio of 1:8), adding 0.15g polyvinylpyrrolidone, stirring vigorously to dissolve completely, and adding 0.39g (NH)4)2HPO4Dissolved in 10mL of a solution of dimethyl sulfoxide and ethylene glycol, added dropwise to the solution and stirred well for 1h until a pale yellow precipitate is formed.
(2) Then 0.875g of NaBr is weighed and dissolved in 10mL of the same mixed solvent, and the mixed solvent is dropwise added into the solution (1) and stirred vigorously for 2 hours until the uniform dispersion is achieved, so that light green flocculent precipitate is obtained. And standing for precipitation, washing and centrifuging the precipitate for multiple times by using deionized water and absolute ethyl alcohol, and drying at 60 ℃ to obtain the silver phosphate/silver bromide heterojunction nano-particles. The yield is 97%, the content of silver phosphate is 10%, and the balance is silver bromide.
Example 4:
the difference from the embodiment 1 is that: the soluble phosphate used in the step (1) is NH4H2PO4The surfactant is poloxamer, the mixed solvent is dimethyl sulfoxide and glycol (the volume ratio is 1:4), the yield of the product is 95%, the content of silver phosphate is 40%, and the balance is silver bromide.
Claims (1)
1. A preparation method of silver phosphate/silver bromide heterojunction nanoparticles comprises the steps of preparing silver phosphate/silver bromide heterojunction nanoparticles, wherein the silver phosphate/silver bromide heterojunction nanoparticles are nanoscale particles and are of a heterojunction structure, the mass percentage of AgBr is 20%, and the balance is Ag3PO4The method is characterized by comprising the following steps:
(1) and (3) synthesizing silver phosphate: soluble silver salt and surfactant are dissolved in multi-component mixed solvent to form Ag+The solution is dripped with phosphate solution to react and synthesize Ag3PO4Nanoparticles of which PO is4 3-With Ag+The molar ratio is 1:3-1: 3.2;
the soluble silver salt is AgNO3(ii) a The concentration of the soluble silver salt is 0.5-2 mol/L;
the phosphate is Na2HPO4、(NH4)2HPO4、NaH2PO4Or NH4H2PO4The concentration of the phosphate solution is 0.5 mol/L;
the multi-element mixed solvent is a binary mixed solvent of dimethyl sulfoxide and water, or dimethyl sulfoxide and ethanol or dimethyl sulfoxide and ethylene glycol; the volume ratio of the two components is 1:1-1: 8;
the surfactant is polyvinylpyrrolidone, cetyl trimethyl ammonium bromide, polyethylene glycol or poloxamer; the addition amount of the surfactant is 0.5g/L-5g/L, and Br-Is a soluble bromide;
(2) synthesizing silver phosphate/silver bromide heterojunction nanoparticles: introducing Br into the reaction solution in the step (1) in a dropwise manner-And the concentration is 0.2-1.5mol/L, silver phosphate/silver bromide nano-particles are synthesized in an ion exchange mode, products are repeatedly washed by deionized water and absolute ethyl alcohol, and reaction products are obtained after drying.
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