CN113856709A - Preparation method of catalyst for photocatalytic decomposition of pure water - Google Patents
Preparation method of catalyst for photocatalytic decomposition of pure water Download PDFInfo
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- CN113856709A CN113856709A CN202111139723.6A CN202111139723A CN113856709A CN 113856709 A CN113856709 A CN 113856709A CN 202111139723 A CN202111139723 A CN 202111139723A CN 113856709 A CN113856709 A CN 113856709A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 230000001699 photocatalysis Effects 0.000 title claims abstract description 49
- 238000000354 decomposition reaction Methods 0.000 title claims abstract description 27
- 239000003054 catalyst Substances 0.000 title claims description 38
- 238000002360 preparation method Methods 0.000 title claims description 8
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 claims abstract description 67
- 239000000463 material Substances 0.000 claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 claims abstract description 29
- 239000002184 metal Substances 0.000 claims abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical class [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 62
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical class [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 48
- 239000011572 manganese Chemical class 0.000 claims description 29
- 238000006243 chemical reaction Methods 0.000 claims description 24
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 9
- 229910052759 nickel Inorganic materials 0.000 claims description 8
- 238000009210 therapy by ultrasound Methods 0.000 claims description 8
- 238000007146 photocatalysis Methods 0.000 claims description 7
- 229910019142 PO4 Inorganic materials 0.000 claims description 6
- 239000010452 phosphate Substances 0.000 claims description 6
- 229910052724 xenon Inorganic materials 0.000 claims description 6
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 6
- 229910021205 NaH2PO2 Inorganic materials 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 229910052742 iron Chemical class 0.000 claims description 5
- 230000001678 irradiating effect Effects 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 229910052723 transition metal Inorganic materials 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 4
- 229910052748 manganese Chemical class 0.000 claims description 4
- 239000002244 precipitate Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000006228 supernatant Substances 0.000 claims description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical class [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 3
- 150000003624 transition metals Chemical class 0.000 claims description 3
- 150000001868 cobalt Chemical class 0.000 claims description 2
- 229910052734 helium Inorganic materials 0.000 claims description 2
- 239000001307 helium Substances 0.000 claims description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 2
- 159000000014 iron salts Chemical class 0.000 claims description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 2
- 229910052753 mercury Inorganic materials 0.000 claims description 2
- 150000002815 nickel Chemical class 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 2
- 229910001380 potassium hypophosphite Inorganic materials 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims description 2
- -1 transition metal salts Chemical class 0.000 claims description 2
- 238000009489 vacuum treatment Methods 0.000 claims description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 37
- 239000001257 hydrogen Substances 0.000 abstract description 37
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 37
- 229910001392 phosphorus oxide Inorganic materials 0.000 abstract description 8
- 229910052751 metal Inorganic materials 0.000 abstract description 7
- 230000004048 modification Effects 0.000 abstract description 7
- 238000012986 modification Methods 0.000 abstract description 7
- VSAISIQCTGDGPU-UHFFFAOYSA-N tetraphosphorus hexaoxide Chemical compound O1P(O2)OP3OP1OP2O3 VSAISIQCTGDGPU-UHFFFAOYSA-N 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 abstract description 6
- 238000004729 solvothermal method Methods 0.000 abstract description 3
- 238000001308 synthesis method Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 abstract description 3
- 239000013078 crystal Substances 0.000 abstract description 2
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- 239000011701 zinc Substances 0.000 description 130
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- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 239000002105 nanoparticle Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 4
- 238000010672 photosynthesis Methods 0.000 description 4
- 239000011241 protective layer Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 229910001379 sodium hypophosphite Inorganic materials 0.000 description 4
- 229910003266 NiCo Inorganic materials 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 239000004005 microsphere Substances 0.000 description 3
- 239000002073 nanorod Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011941 photocatalyst Substances 0.000 description 3
- 230000029553 photosynthesis Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000000985 reflectance spectrum Methods 0.000 description 3
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- 238000012546 transfer Methods 0.000 description 3
- 229910000319 transition metal phosphate Inorganic materials 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- XUJNEKJLAYXESH-REOHCLBHSA-N L-Cysteine Chemical compound SC[C@H](N)C(O)=O XUJNEKJLAYXESH-REOHCLBHSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 238000005341 cation exchange Methods 0.000 description 2
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- 230000004298 light response Effects 0.000 description 2
- ISPYRSDWRDQNSW-UHFFFAOYSA-L manganese(II) sulfate monohydrate Chemical compound O.[Mn+2].[O-]S([O-])(=O)=O ISPYRSDWRDQNSW-UHFFFAOYSA-L 0.000 description 2
- 229910052752 metalloid Inorganic materials 0.000 description 2
- 150000002738 metalloids Chemical class 0.000 description 2
- RRIWRJBSCGCBID-UHFFFAOYSA-L nickel sulfate hexahydrate Chemical compound O.O.O.O.O.O.[Ni+2].[O-]S([O-])(=O)=O RRIWRJBSCGCBID-UHFFFAOYSA-L 0.000 description 2
- 229940116202 nickel sulfate hexahydrate Drugs 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
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- PWKSKIMOESPYIA-UHFFFAOYSA-N 2-acetamido-3-sulfanylpropanoic acid Chemical compound CC(=O)NC(CS)C(O)=O PWKSKIMOESPYIA-UHFFFAOYSA-N 0.000 description 1
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 1
- 229910002596 FexO Inorganic materials 0.000 description 1
- 239000004201 L-cysteine Substances 0.000 description 1
- 235000013878 L-cysteine Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- ZOIORXHNWRGPMV-UHFFFAOYSA-N acetic acid;zinc Chemical compound [Zn].CC(O)=O.CC(O)=O ZOIORXHNWRGPMV-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- LHQLJMJLROMYRN-UHFFFAOYSA-L cadmium acetate Chemical compound [Cd+2].CC([O-])=O.CC([O-])=O LHQLJMJLROMYRN-UHFFFAOYSA-L 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
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- 238000004587 chromatography analysis Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- QGUAJWGNOXCYJF-UHFFFAOYSA-N cobalt dinitrate hexahydrate Chemical compound O.O.O.O.O.O.[Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O QGUAJWGNOXCYJF-UHFFFAOYSA-N 0.000 description 1
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- 239000002360 explosive Substances 0.000 description 1
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- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- QZRHHEURPZONJU-UHFFFAOYSA-N iron(2+) dinitrate nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Fe+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O QZRHHEURPZONJU-UHFFFAOYSA-N 0.000 description 1
- SZQUEWJRBJDHSM-UHFFFAOYSA-N iron(3+);trinitrate;nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O SZQUEWJRBJDHSM-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 229910001463 metal phosphate Inorganic materials 0.000 description 1
- 239000005300 metallic glass Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- FBMUYWXYWIZLNE-UHFFFAOYSA-N nickel phosphide Chemical compound [Ni]=P#[Ni] FBMUYWXYWIZLNE-UHFFFAOYSA-N 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- LFGREXWGYUGZLY-UHFFFAOYSA-N phosphoryl Chemical compound [P]=O LFGREXWGYUGZLY-UHFFFAOYSA-N 0.000 description 1
- 238000001259 photo etching Methods 0.000 description 1
- 238000013032 photocatalytic reaction Methods 0.000 description 1
- 238000006303 photolysis reaction Methods 0.000 description 1
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- 238000012827 research and development Methods 0.000 description 1
- 239000011257 shell material Substances 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- LSRGDVARLLIAFM-UHFFFAOYSA-N sulfuric acid;hexahydrate Chemical compound O.O.O.O.O.O.OS(O)(=O)=O LSRGDVARLLIAFM-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 239000004246 zinc acetate Substances 0.000 description 1
Images
Classifications
-
- 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
- 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
- B01J27/1808—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 zinc, cadmium or mercury
-
- B01J35/39—
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/04—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by decomposition of inorganic compounds, e.g. ammonia
- C01B3/042—Decomposition of water
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
Abstract
The application successfully prepares Zn in a mixed solvent by using a solvothermal method0.3Cd0.7S/ZnS(DETA)0.5And (3) carrying out modification such as phosphorus oxide loading and metal doping on the heterojunction material by utilizing a photochemical synthesis method. The parameters of the crystal structure, forbidden band width, morphology, composition and the like of the prepared sample are characterized in detail by using multiple means such as XRD, UV-vis DRS, SEM, EDS and the like. The prepared sample was subjected to photocatalytic decomposition pure water test, and found that: (Zn)aCdbFec)S/(ZndFee)S/POx/NifThe Pi sample shows the highest hydrogen production rate of pure water by photocatalytic decomposition, and the hydrogen production rate reaches 1.465 mmol.h under the irradiation condition of visible light (lambda is more than 420nm and less than 780nm)‑1·g‑1。
Description
Technical Field
The invention relates to a method for producing hydrogen by photocatalytic water, in particular to a catalyst for decomposing pure water by photocatalysis and a preparation method thereof.
Background
The hydrogen energy is used as a secondary energy, has the advantages of high combustion heat value (the energy density is 143kJ/g), large reserve (water can be used as a hydrogen source), reproducibility (a combustion product is water, and the water can be reduced into the hydrogen again), convenience in storage and transportation and the like, and can be used for relieving the problems of the existing energy crisis and environmental pollution. Compared with the prior method for producing hydrogen by using fossil fuelThe photocatalytic water splitting hydrogen production technology with simple operation and low cost has great potential, but the preparation of the photocatalyst with high activity and high stability is still a long-term and difficult challenge. Among the photocatalytic materials, ZnxCd1-xThe S-based catalyst is considered to be one of the most potential photocatalytic materials due to the advantages of controllable energy band structure, high efficiency of photocatalytic partial water decomposition (PPWS) hydrogen production and the like. However, in the application of photocatalytic pure water decomposition, due to the defects of poor stability and low hydrogen production efficiency caused by lack of sacrificial reagent for capturing photoproduction cavities, Zn is restrictedxCd1-xResearch and development of S-based catalysts have been advanced.
The process of photocatalytic decomposition of pure water can be divided into: photocatalytic total decomposition of water (2H)2O→2H2+O2POWS) and photocatalytic intermediate stage decomposition of water (2H)2O→H2+H2O2PIWS). Unlike the photocatalytic partial water splitting reaction (PPWS), the photohole reaction pathways are numerous due to the lack of capture of sacrificial reagents. Except that four electrons (O) are generated2) Transfer of the product and possible formation of a single electron·OH), two electrons (H)2O2) Transfer of by-products, wherein H2O2Will oxidize S2-Causing catalyst poisoning (CdS + 4H)2O2→Cd2++SO4 2-+4H2O). Furthermore, ZnxCd1-xThe S-based catalyst can generate the photo-corrosion phenomenon (oxygen-free photo-corrosion: CdS +2 h)+→Cd2++ S; aerobic photo etching: CdS +4h++2H2O+O2→Cd2++SO4 2-+4H+) This allows the water oxidation process to act as a kinetic-determining step for the reaction of decomposing pure water, directly affecting the stability of the catalyst and the efficiency of decomposing pure water.
Given that stability is an important indicator of catalyst application, Zn is improvedxCd1-xThe problem of photo-corrosion of S-based catalysts is imperative. Through a large amount of literature research, the following findings are obtained: since the phosphide has metalloid and high stability characteristics, Zn is transformed intoxCd1-xAfter the phosphide cocatalyst is introduced into the S-based catalyst, the catalyst can effectively relieveThe problem of photo-corrosion. In 2018, the group of problems of the Lugong boiler uses combustible and explosive white phosphorus as a phosphorus source and adopts a hydrothermal method to produce ZnxCd1-xOuter layer of S-based catalyst to prepare Ni2The P shell material realizes the process of photocatalytic total water decomposition (POWS), and makes AG/Ni dissolved in an artificial cheek (AG) high-efficiency separation system2The P/CdS catalytic system shows higher hydrogen production rate (0.838 mmol.h) for decomposing pure water-1·g-1). In 2020, Chenyubin task group utilized high temperature pyrolysis NaH2PO2The generated virulent PH3 is used as a phosphorus source to prepare RP @ CoP/Cd0.9Zn0.1An S-type Z-scheme system capable of decomposing pure water in a photocatalytic intermediate-stage water decomposition (PIWS) route, achieving an apparent quantum efficiency of 6.4% at 420 nm. By contrast, it is easy to find that: although the catalyst system is loaded with the phosphide promoter, the performance of the catalyst system in photocatalytic decomposition of pure water to produce hydrogen is far different from the traditional performance of photocatalytic partial decomposition of water to produce hydrogen. And the modification process with high toxicity and high energy consumption also limits the application space of phosphide. From the perspective of green, safety and energy saving, the rapid and convenient photochemical synthesis method for preparing phosphide has great advantages.
It is known that the preparation of phosphides involves the incorporation of large amounts of phosphate compounds, the effect of which is often overlooked. Recently, the group of zhengshihui topics assembled NiCoPi modified CdS catalytic systems, which found: NiCoPi can capture photogenerated electrons and holes of CdS catalyst, thereby generating NiICoP and NiCoIIIPi, and taking the catalytic site as a catalytic site to carry out photocatalytic hydrogen production and oxidation sacrificial reagent reaction. The phosphate promoter can be used as a hydrogen production promoter and a water oxidation promoter at the same time, and the dual-functional characteristic enables the phosphate promoter to have extremely high application value in the field of photocatalytic pure water. Although the transition metal phosphate catalyst has been widely applied to the fields of electrocatalysis and photoelectrocatalysis decomposition of pure water, the transition metal phosphate catalyst is used as a cocatalyst to modify ZnxCd1-xThe research on the process of photocatalytic decomposition of pure water by using an S-based catalyst is rarely reported.
Disclosure of Invention
In view of the above circumstances, the present inventors have conducted intensive studies and have found a catalyst for photocatalytic decomposition of pure water and a method for producing the same.
The invention aims to provide a preparation method of a catalyst for photocatalytic decomposition of pure water, which comprises the following steps:
(1)Zn0.3Cd0.7S/ZnS(DETA)0.5the heterojunction material is dispersed in H2PO2 -In the solution, carrying out ultrasonic treatment under the protection of inert gas;
(2) then transferring the suspension obtained in the step (1) into a photocatalytic reactor, sealing the container, vacuumizing the whole reaction system by using a vacuum pump, irradiating the reactor by using a visible light source, and keeping the temperature at room temperature and stirring continuously;
(3) after the reaction is finished, opening the reactor, removing supernatant, centrifugally recovering precipitate, drying in an oven and recovering to obtain phosphate radical modified Zn0.3Cd0.7S/ZnS(DETA)0.5Marked as Zn0.3Cd0.7S/ZnS(DETA)0.5/POx；
(4) Taking Zn0.3Cd0.7S/ZnS(DETA)0.5/POxSample, dispersed in H containing one or more transition metal salts2PO2 -Ultrasonic treating in water solution under the protection of inert gas, transferring to a photocatalytic reactor, sealing the container, vacuumizing the whole reaction system by using a vacuum pump, irradiating the reactor by using a visible light source, keeping the temperature at room temperature, continuously stirring, opening the reactor after the reaction is finished, removing supernatant, centrifugally recovering precipitate, drying in an oven, and recovering to obtain Zn doped with transition metal0.3Cd0.7S/ZnS(DETA)0.5/POxNamely the catalyst for decomposing pure water by photocatalysis;
the one or more transition metal salts are selected from nickel salts, cobalt salts, iron salts, mixed salts of nickel and iron, and mixed salts of nickel and manganese.
Preferably, the inert other is nitrogen, argon or helium;
preferably, said H2PO2 -The solution is NaH2PO2、KH2PO2One of (1);
preferably, the ultrasonic treatment time is 20-60 min;
preferably, the vacuum treatment time is 10-30 min;
preferably, the visible light source is one of sunlight, a xenon lamp, a mercury lamp, an incandescent lamp, a light-emitting diode lamp and the like, and the processing time is 2-5 h;
preferably, the drying temperature of the oven is 50-70 ℃, and the drying time is 10-15 h.
The invention also provides the photocatalytic decomposition pure water catalyst prepared by the method.
Compared with the prior art, the invention has the beneficial effects that:
the method successfully prepares Zn in a mixed solvent by using a solvothermal method0.3Cd0.7S/ZnS(DETA)0.5And (3) carrying out modification such as phosphorus oxide loading and metal doping on the heterojunction material by utilizing a photochemical synthesis method. The parameters of the crystal structure, forbidden band width, morphology, composition and the like of the prepared sample are characterized in detail by using multiple means such as XRD, UV-vis DRS, SEM, EDS and the like. The prepared sample was subjected to photocatalytic decomposition pure water test, and found that: (Zn)aCdbFec)S/(ZndFee)S/POx/NifThe Pi sample shows the highest hydrogen production rate of pure water by photocatalytic decomposition, and the hydrogen production rate reaches 1.465 mmol.h under the irradiation condition of visible light (lambda is more than 420nm and less than 780nm)-1·g-1. The photochemical synthesis modification strategy with simple operation and low cost opens a new door for the application of the material with easy light corrosion in the field of photocatalytic decomposition of pure water.
Drawings
FIG. 1: zn0.3Cd0.7S/ZnS(DETA)0.5SEM image of sample
FIG. 2: zn0.3Cd0.7S/ZnS(DETA)0.5X-ray diffraction (XRD) pattern of
FIG. 3: zn0.3Cd0.7S/ZnS(DETA)0.5Ultraviolet-visible diffuse reflection spectrogram (A) and energy band conversion spectrogram (B)
FIG. 4: XRD patterns of the respective photocatalysts
FIG. 5: ultraviolet-diffuse reflectance spectrum (A) of each catalyst, band conversion spectrum (B) of each catalyst
FIG. 6: (Zn)aCdbFec)S/(ZndFee)S/POx/NifSEM image of Pi sample
FIG. 7: hydrogen production curve diagram of catalyst after metal modification
Detailed Description
Example 1.Zn0.3Cd0.7S/ZnS(DETA)0.5Preparation of the Material
Weighing 315ml of Diethylenetriamine (DETA) and 35ml of pure water, mixing and pouring into a 500ml big beaker, weighing 1100mg (5mmol) of zinc acetate, 1322.5mg (5mmol) of cadmium acetate and 2450mg (20mmol) of L-cysteine, pouring into the beaker filled with the mixed solution, dissolving the medicines in the beaker by a magnetic stirrer and an ultrasonic cleaner, pouring the dissolved solution into a reaction kettle after dissolving the medicines, screwing the reaction kettle, putting the reaction kettle into an electric heating constant temperature blast drying box for reacting at 180 ℃ for 24 hours, and after the reaction is stopped, putting the prepared Zn into a centrifuge0.3Cd0.7S/ZnS(DETA)0.5Recovering and putting into an oven for dehydration to obtain yellow powder Zn0.3Cd0.7S/ZnS(DETA)0.5A material.
Example 2 Zn0.3Cd0.7S/ZnS(DETA)0.5Phosphorus oxide coating of material surface layer
Weighing 180mg of Zn0.3Cd0.7S/ZnS(DETA)0.52385mg sodium hypophosphite and into 50ml centrifuge tube, adding 30ml deionized water, under the protection of argon gas, performing ultrasonic treatment in ultrasonic instrument for 30min, pouring the ultrasonic solution into the photosynthetic reactor and adding 50ml deionized water, starting the stirrer, pumping the reactor into a vacuum state by vacuum pump, starting xenon lamp for illumination for 3 hr, and in the illumination process, using NaH2PO2Capturing photoproduction cavity, assisting catalyst to carry out photocatalytic hydrogen production reaction, and simultaneously utilizing NaH2PO2Can capture photoproduction electrons, and the phosphorus oxide generated by oxidation and reduction reaction is coated on Zn0.3Cd0.7S/ZnS(DETA)0.5The surface of the material. Completion of Zn0.3Cd0.7S/ZnS(DETA)0.5/POxAnd (4) preparing the material.
EXAMPLE 3 photochemical Synthesis experiments
1. Photochemical synthesis experiment of nickel and iron-based cocatalyst: 82mg of prepared Zn is weighed0.3Cd0.7S/ZnS(DETA)0.5/POxThe method comprises the following steps of pouring materials, 38mg of nickel sulfate hexahydrate, 18.5mg of ferric nitrate nonahydrate and 141mg of sodium hypophosphite into a 50ml centrifuge tube together, adding 30ml of deionized water into the centrifuge tube, carrying out ultrasonic treatment for half an hour under the protection of argon, pouring ultrasonic solution and 50ml of deionized water into a photosynthesis reactor after the ultrasonic treatment is finished, vacuumizing the reactor by using a centrifugal pump, turning on a magnetic stirrer and a xenon lamp light source, illuminating for two hours, turning off the xenon lamp and the stirrer after the two hours, allowing the solution in the reactor to stand for more than half an hour, and centrifugally recycling after the materials are completely deposited, wherein the material mark is as follows: (Zn)aCdbFec)S/(ZndFee)S/POx/NifPi。
2. Photochemical synthesis experiment of nickel and manganese-based cocatalyst: 82mg of prepared Zn is weighed0.3Cd0.7S/ZnS(DETA)0.5/POxMaterial, 35.7mg nickel sulfate hexahydrate, 9.2mg manganese sulfate monohydrate, and 141mg sodium hypophosphite were added, and the operations in 1 were repeated, and the final resulting material was labeled as: (Zn)aCdbMnc)S/(ZndMne)S/POx/NifPi。
3. Photochemical synthesis experiment of nickel, manganese, iron and cobalt-based single metal promoter: in the process of single metal base cocatalyst photosynthesis, 82mg of prepared Zn is required to be added in each photosynthesis reaction0.3Cd0.7S/ZnS(DETA)0.5/POxMaterials, 141mg of sodium hypophosphite, different metal salts (50mg ofNickel sulfate hexahydrate or 33mg manganese sulfate monohydrate or 77mg iron nitrate nonahydrate or 56mg cobalt nitrate hexahydrate) the operations in 1 were repeated, and the finally obtained materials were respectively marked as: zn0.3Cd0.7S/ZnS(DETA)0.5/POx/NiaPi、(ZnaCdbMnc)S/(ZndMne)S/POx、(ZnaCdbFec)S/(ZndFee)S/POx、Zn0.3Cd0.7S/ZnS(DETA)0.5/POx/CoaPi。
Example 4.Zn0.3Cd0.7S/ZnS(DETA)0.5Is characterized by
To explore Zn0.3Cd0.7S/ZnS(DETA)0.5And (3) analyzing the morphology of the material by using an SEM scanning electron microscope. As can be seen from FIG. 1A, Zn0.3Cd0.7S/ZnS(DETA)0.5The material is in a micron spherical shape, the size of the material is within the range of 2-4 mu m, and after a single micron spherical material is further observed in an enlarged mode (figure 1B), a large number of nano particles with different sizes are loaded on the surface layer of the spherical material, and the size of the nano particles is between 50-100 nm. To determine the composition of the catalyst material, we characterized it by EDS, as shown in FIG. 2 and Table 1, the atomic percent Zn/Cd inside the microspheres is about 3: 7, indicating that the true composition of the microsphere material should be Zn0.3Cd0.7S, which is obviously different from the feeding ratio of Zn/Cd 1: 1. Due to Zn in the solvothermal process2+And Cd2+The difference of the complexing ability with diethylenetriamine and L-cysteine and the larger difference of the solubility products between ZnS and CdS will cause a part of Zn2+Can not be blended into ZnxCd1-xS solid solution material. In the EDS analysis, a significant amount of C, N element was found to be present, apparently resulting from the complexing diethylenetriamine molecule at the surface of the material, which indicates the loss of Zn in our charge2+For generating ZnS (DETA)0.5Material and exhibits a striped morphology. We observed that the microsphere surface layer was wrapped with some strip-like material, indicating that Zn was successfully prepared0.3Cd0.7S/ZnS(DETA)0.5A heterojunction material.
TABLE 1 Zn0.3Cd0.7S/ZnS(DETA)0.5Electronic dispersion energy spectrum meter
FIG. 2 shows Zn0.3Cd0.7S/ZnS(DETA)0.5The XRD pattern of the material is found by comparison: zn0.3Cd0.7S/ZnS(DETA)0.5The XRD diffraction peak of the material is positioned between cubic phase ZnS (PDF #05-0566) and hexagonal phase CdS (PDF #41-1049) card peaks, and the Zn prepared by the subject group is illustrated0.3Cd0.7The S material is solid solution material instead of mixture of ZnS and CdS, and Zn0.3Cd0.7S/ZnS(DETA)0.5The material exhibits typical hexagonal phase diffraction peaks.
As can be observed from the ultraviolet diffuse reflectance spectrum 3A, the absorption edge band of the raw material is about 500 nm. FIG. 3B is a band conversion map of the material, in which the band gap width of the raw material is 2.52eV, and these parameters illustrate Zn0.3Cd0.7S/ZnS(DETA)0.5The material is an excellent visible light response photocatalyst.
Example 5 characterization of modified catalyst Material
As shown in FIG. 4, with Zn0.3Cd0.7S/ZnS(DETA)0.5In contrast, Zn0.3Cd0.7S/ZnS(DETA)0.5/POx、(ZnaCdbFec)S/(ZndFee)S/POx/NifPi、(ZnaCdbMnc)S/(ZndMne)S/POx/NifPi、Zn0.3Cd0.7S/ZnS(DETA)0.5/POx/NiaPi、(ZnaCdbMnc)S/(ZndMne)S/POx、(ZnaCdbFec)S/(ZndFee)S/POxAnd Zn0.3Cd0.7S/ZnS(DETA)0.5/POx/CoaNo significant change in the peak position of samples such as Pi and the like occurred, and no new diffraction peak was generated. The phosphorus oxide protective layer and the phosphate cocatalyst which are deposited on the surface layer are amorphous structures after two-step photochemical synthesis, and the amorphous metal phosphate (Ni)aPi or CoaPi) material, the internal transition metal can realize the self-healing characteristic of the material through valence change, and hopefully help the material to convert between phosphate and phosphide, so that the material has great application potential in the process of decomposing pure water by photocatalysis.
As shown in FIG. 5A, we tested Zn0.3Cd0.7S/ZnS(DETA)0.5、Zn0.3Cd0.7S/ZnS(DETA)0.5/POx、(ZnaCdbFec)S/(ZndFee)S/POx/NifPi and (Zn)aCdbMnc)S/(ZndMne)S/POx/NifUv-diffuse reflectance spectrum of Pi. With Zn0.3Cd0.7S/ZnS(DETA)0.5In contrast, Zn0.3Cd0.7S/ZnS(DETA)0.5/POxAnd (Zn)aCdbFec)S/(ZndFee)S/POx/NifThe absorption intensity of the Pi sample is not obviously changed, the edge of an absorption band does not obviously move, and the absorption side band is within the range of 500-510 nm. In contrast to the three samples described above, (Zn)aCdbMnc)S/(ZndMne)S/POx/NifPi shows higher photoresponse capability in the spectral range of 300-800 nm, and the absorption edge is shifted to about 550 nm.
We further converted the band gaps of the four samples by the Kubelka-Munk formula. As shown in FIG. 5B and Table 2, Zn0.3Cd0.7S/ZnS(DETA)0.5、Zn0.3Cd0.7S/ZnS(DETA)0.5/POx、(ZnaCdbFec)S/(ZndFee)S/POx/NifThe band gap values of three Pi samples are not greatly different2.52, 2.54 and 2.53eV respectively, which shows that all three samples have excellent visible light response capability. (Zn)aCdbMnc)S/(ZndMne)S/POx/NifThe Pi sample exhibits the smallest bandgap value (2.43 eV). These results illustrate that: after a single photochemical synthesis process, the deposited phosphorus oxide protective layer may modify ZnS (DETA) inside the raw material0.5The sulfur vacancy defect state of the components causes the band gap of the material to be slightly widened, but the overall transformation is not large; in the second step of photochemical synthesis, Zn may be present in Fe, Mn and other ions due to cation exchange0.3Cd0.7S/ZnS(DETA)0.5/POxDoping of the material to form (Zn)aCdbFec)S/(ZndFee)S/POx/NifPi and (Zn)aCdbMnc)S/(ZndMne)S/POx/NifThe band gap of the Pi samples, produced different degrees of degradation. The narrower energy band gap means higher photoresponse capability and higher photon capture efficiency, so that higher density of photon-generated carriers are generated, and the efficiency of hydrogen production by photolysis of a catalytic system is improved.
TABLE 2 band gap Width (E)g) Watch (A)
We are right (Zn)aCdbFec)S/(ZndFee)S/POx/NifPi samples were characterized by SEM (fig. 6). As shown in the figure, after two-step photochemical synthesis modification, (Zn)aCdbFec)S/(ZndFee)S/POx/NifThe Pi sample still shows the micron spherical shape, the grain diameter is between 1.4 and 5 mu m, and the surface layer of the micron sphere surrounds the stripLike materials, these materials should be ZnS (DETA)0.5The components being converted to (Zn) in a two-step photochemical synthesisdFee) And (4) S material. After further amplification, it was found that: the micron spherical material is actually in a ball-stick shape assembled by countless nano rods, and the original observation is that Zn is formed0.3Cd0.7S/ZnS(DETA)0.5The nanoparticles on the surface layer of the material may be similar to nanoparticles because the nanorods are densely packed and we only see the tips of the nanorods. To verify the composition of these materials, we performed EDS analysis on them and found that: the surface layer of the material has Ni, P, O and other element distribution, but has no Fe element distribution, which indicates that Fe element is doped into the interior of the sulfide raw material, and transition metal phosphate loaded on the surface layer is changed into NidPi。
TABLE 3 (Zn)aCdbFec)/S/POx/(FedNie) Pi electronic dispersion energy spectrum meter
Example 6 photocatalytic intermediate stage decomposition pure Water Performance test of modified catalyst Material
The prepared sample is subjected to a photocatalytic decomposition pure water hydrogen production test, and the specific steps are entered:
30mg of a sample to be tested is weighed, dispersed in 80ml of ultrapure water and subjected to ultrasonic treatment for 30min under the protection of argon. Then the suspension was transferred to a photocatalytic reactor, and after the vessel was sealed, the entire reaction system was vacuumed with a vacuum pump for 15 min. Irradiating the reactor with visible light source (300W xenon lamp with 420nm front cut-off filter), stirring at room temperature, passing the gas generated by the system through chromatography (Tianmei GC7900, TCD, Ar as carrier gas,
molecular sieve column), quantitative analysis was performed.
The results are shown in FIG. 7. Under the irradiation condition of visible light (lambda is more than 420nm and less than 780nm),zn due to severe photo-corrosion phenomena0.3Cd0.7S/ZnS(DETA)0.5The material does not exhibit hydrogen production performance in pure water, so we do not show the performance parameters of this sample in the figures, tables. In contrast, Zn0.3Cd0.7S/ZnS(DETA)0.5/POxAnd (Zn)aCdbMnc)S/(ZndMne)S/POxThe sample shows the capacity of producing hydrogen by decomposing pure water through photocatalysis, a hydrogen peak is found in gas chromatography, but the hydrogen production area is too small, and the system cannot calculate the peak area, so that the map of the sample is not shown in FIG. 7. The reason why the hydrogen-producing performance is from inexistence to existence is presumed to be that Zn is subjected to the first step of photochemical synthesis0.3Cd0.7S/ZnS(DETA)0.5The surface layer of the material is covered with a layer of phosphorus oxide, and the amorphous substance can be used as a protective layer to effectively delay Zn0.3Cd0.7S/ZnS(DETA)0.5The material has a photo-corrosion effect caused by contact with dissolved oxygen in water, and the hydrogen production performance of the material cannot be effectively improved by singly doping Mn element. The photocatalytic hydrogen production performance of the rest samples is as follows: (Zn)aCdbFee)S/(ZndFee)S/POx、Zn0.3Cd0.7S/ZnS(DETA)0.5/POx/CoaPi、Zn0.3Cd0.7S/ZnS(DETA)0.5/POx/NiaPi、(ZnaCdbMnc)S/(ZndMne)S/POx/NifPi、(ZnaCdbFec)S/(ZndFee)S/POx/NifThe sequence of Pi was sequentially enhanced, and the hydrogen production rate thereof was as shown in table 4.
According to recent research, NiCoPi material can synchronously capture photogenerated electrons and holes in the process of photocatalytic hydrogen production so as to convert the photogenerated electrons into NiICoP and NiCoIIIPi is used. Then NiICoP and NiCoIIIPi is further used to collect photo-generated electrons and holes for use in photocatalytic reactions. From our experimental results, Zn0.3Cd0.7S/ZnS(DETA)0.5/POx/NiaPi sample showed an advantage over Zn0.3Cd0.7S/ZnS(DETA)0.5/POx/CoaThe hydrogen production activity of the Pi sample is actually Ni in essenceaNi produced by Pi transformationaP is a radical superior to CoaP as hydrogen-generating promoter. As is known, nickel phosphide catalysts are widely used as hydrogen production promoters due to their metalloid characteristics, and are applied to the photocatalytic hydrogen production half reaction of a sacrificial agent system, but are still rare in the application of photocatalytic decomposition of pure water to produce hydrogen. To our surprise, (Zn)aCdbMnc)S/(ZndMne)S/POx/NifPi and (Zn)aCdbFee)S/(ZndFee)S/POx/NifPi bimetallic modified catalytic systems all show superiority to Zn0.3Cd0.7S/ZnS(DETA)0.5/POx/NiaPi hydrogen production activity. Fe added due to the simultaneous presence of metal ion exchange in the second step of the photosynthesis3+Or Mn2+Will be doped with Zn0.3Cd0.7S/ZnS(DETA)0.5/POxIron sulfide or manganese sulfide is formed in the material and loaded on the surface layer of the catalyst, and the sulfide catalyst promoters are easy to partially oxidize Fe in the process of decomposing pure water by photocatalysisxO or MnxO。
TABLE 4 hydrogen generation rate table of catalyst after metal modification
Due to (Zn)dFee) The S component has a wider band gap value, so that (Zn)aCdbFec) S and (Zn)dFee) S two components easily form type I heterostructure type, but ZnS (DETA)0.5Like materials tend to be storedIn a plurality of defect structures, formed by cation exchange (Zn)dFee) S material, also has defect energy level, so that (Zn) is inaCdbFec)S/(ZndFee)S/POx/NifInternal to Pi catalytic system (Zn)aCdbFec)S/(ZndFee) And a quasi-type II type heterostructure is formed among the S components, so that the separation and transmission of photon-generated carriers in the heterostructure are facilitated. Therefore, in the application of photocatalytic decomposition of pure water, when visible light is irradiated (Zn)aCdbFec)S/(ZndFee)S/POx/NifInternal to the catalyst after Pi catalytic systemaCdbFec) S and (Zn)dFee) The S component is excited simultaneously in (Zn)aCdbFec)S/(ZndFee) In the S heterojunction structure, photo-generated electrons and holes in the material are finally gathered to (Zn)aCdbFec) S conduction band and (Zn)dFee) In the defect energy level of S, the diethylenetriamine molecules complexed on the surface layer of the catalytic system can further transfer photoproduction holes to the surface layer, and finally the photoproduction holes can be FexO or MnxO、NiaPi and other promoters are used for capturing to further improve the capture rate of photoproduction holes of the system, and in addition, the promoters and the phosphorus oxide protective layer can improve the anti-light corrosion capability of the system and indirectly improve the photocatalytic hydrogen production activity of the system; at the same time NiaPartial conversion of Pi to NiaP can capture photo-generated electrons and take the photo-generated electrons as sites to carry out proton reduction reaction to generate H2. Different types of cocatalysts are utilized to synergistically optimize the surface kinetic reaction rate of the catalytic system, so that the efficient and stable photocatalytic pure water decomposition process is realized.
Claims (3)
1. A preparation method of a catalyst for decomposing pure water by photocatalysis is characterized by comprising the following steps:
(1)Zn0.3Cd0.7S/ZnS(DETA)0.5the heterojunction material is dispersed inH2PO2 -In the solution, carrying out ultrasonic treatment under the protection of inert gas;
(2) then transferring the suspension obtained in the step (1) into a photocatalytic reactor, sealing the container, vacuumizing the whole reaction system by using a vacuum pump, irradiating the reactor by using a visible light source, and keeping the temperature at room temperature and stirring continuously;
(3) after the reaction is finished, opening the reactor, removing supernatant, centrifugally recovering precipitate, drying in an oven and recovering to obtain phosphate radical modified Zn0.3Cd0.7S/ZnS(DETA)0.5Marked as Zn0.3Cd0.7S/ZnS(DETA)0.5/POx；
(4) Taking Zn0.3Cd0.7S/ZnS(DETA)0.5/POxSample, dispersed in H containing one or more transition metal salts2PO2 -Ultrasonic treating in water solution under the protection of inert gas, transferring to a photocatalytic reactor, sealing the container, vacuumizing the whole reaction system by using a vacuum pump, irradiating the reactor by using a visible light source, keeping the temperature at room temperature, continuously stirring, opening the reactor after the reaction is finished, removing supernatant, centrifugally recovering precipitate, drying in an oven, and recovering to obtain Zn doped with transition metal0.3Cd0.7S/ZnS(DETA)0.5/POxNamely the catalyst for decomposing pure water by photocatalysis;
the one or more transition metal salts are selected from nickel salts, cobalt salts, iron salts, mixed salts of nickel and iron, and mixed salts of nickel and manganese.
2. The production method according to claim 1,
preferably, the inert other is nitrogen, argon or helium;
preferably, said H2PO2 -The solution is NaH2PO2、KH2PO2One of (1);
preferably, the ultrasonic treatment time is 20-60min；
Preferably, the vacuum treatment time is 10-30 min;
preferably, the visible light source is one of sunlight, a xenon lamp, a mercury lamp, an incandescent lamp, a light-emitting diode lamp and the like, and the processing time is 2-5 h;
preferably, the drying temperature of the oven is 50-70 ℃, and the drying time is 10-15 h.
3. A catalyst for photocatalytic decomposition of pure water prepared as described in claim 1 or 2.
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