CN114618531B - Preparation and application of photocatalyst with visible light sterilization performance - Google Patents
Preparation and application of photocatalyst with visible light sterilization performance Download PDFInfo
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- CN114618531B CN114618531B CN202210193622.5A CN202210193622A CN114618531B CN 114618531 B CN114618531 B CN 114618531B CN 202210193622 A CN202210193622 A CN 202210193622A CN 114618531 B CN114618531 B CN 114618531B
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- 230000001954 sterilising effect Effects 0.000 title claims abstract description 28
- 238000004659 sterilization and disinfection Methods 0.000 title claims abstract description 28
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 13
- 150000002751 molybdenum Chemical class 0.000 claims abstract description 13
- 239000002131 composite material Substances 0.000 claims abstract description 11
- 239000002243 precursor Substances 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000012153 distilled water Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 239000013110 organic ligand Substances 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 150000003839 salts Chemical class 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000004140 cleaning Methods 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 10
- 241000894006 Bacteria Species 0.000 claims description 9
- 150000000703 Cerium Chemical class 0.000 claims description 7
- 241000588724 Escherichia coli Species 0.000 claims description 7
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical group [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 claims description 6
- 241000191967 Staphylococcus aureus Species 0.000 claims description 5
- 230000000844 anti-bacterial effect Effects 0.000 claims description 5
- 230000005284 excitation Effects 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 4
- MWVTWFVJZLCBMC-UHFFFAOYSA-N 4,4'-bipyridine Chemical compound C1=NC=CC(C=2C=CN=CC=2)=C1 MWVTWFVJZLCBMC-UHFFFAOYSA-N 0.000 claims description 3
- 235000015393 sodium molybdate Nutrition 0.000 claims description 3
- 239000011684 sodium molybdate Substances 0.000 claims description 3
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical group [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 claims description 3
- 229940048181 sodium sulfide nonahydrate Drugs 0.000 claims description 3
- WMDLZMCDBSJMTM-UHFFFAOYSA-M sodium;sulfanide;nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Na+].[SH-] WMDLZMCDBSJMTM-UHFFFAOYSA-M 0.000 claims description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 2
- 235000018660 ammonium molybdate Nutrition 0.000 claims description 2
- 239000011609 ammonium molybdate Substances 0.000 claims description 2
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 claims description 2
- 229940010552 ammonium molybdate Drugs 0.000 claims description 2
- YUKQRDCYNOVPGJ-UHFFFAOYSA-N thioacetamide Chemical group CC(N)=S YUKQRDCYNOVPGJ-UHFFFAOYSA-N 0.000 claims description 2
- DLFVBJFMPXGRIB-UHFFFAOYSA-N thioacetamide Natural products CC(N)=O DLFVBJFMPXGRIB-UHFFFAOYSA-N 0.000 claims description 2
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical group [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims 2
- 229910052684 Cerium Inorganic materials 0.000 claims 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims 1
- 229910052750 molybdenum Inorganic materials 0.000 claims 1
- 239000011733 molybdenum Substances 0.000 claims 1
- 238000000643 oven drying Methods 0.000 claims 1
- 238000001035 drying Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000001699 photocatalysis Effects 0.000 abstract 1
- 238000007146 photocatalysis Methods 0.000 abstract 1
- 238000001308 synthesis method Methods 0.000 abstract 1
- 238000005286 illumination Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 5
- 230000001580 bacterial effect Effects 0.000 description 4
- 150000001879 copper Chemical class 0.000 description 4
- OMZSGWSJDCOLKM-UHFFFAOYSA-N copper(II) sulfide Chemical group [S-2].[Cu+2] OMZSGWSJDCOLKM-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 241000192125 Firmicutes Species 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000010790 dilution Methods 0.000 description 3
- 239000012895 dilution Substances 0.000 description 3
- 238000001027 hydrothermal synthesis Methods 0.000 description 3
- 150000002696 manganese Chemical class 0.000 description 3
- 229910052976 metal sulfide Inorganic materials 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910021642 ultra pure water Inorganic materials 0.000 description 2
- 239000012498 ultrapure water Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- LXBGSDVWAMZHDD-UHFFFAOYSA-N 2-methyl-1h-imidazole Chemical compound CC1=NC=CN1 LXBGSDVWAMZHDD-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical group [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910021380 Manganese Chloride Inorganic materials 0.000 description 1
- GLFNIEUTAYBVOC-UHFFFAOYSA-L Manganese chloride Chemical group Cl[Mn]Cl GLFNIEUTAYBVOC-UHFFFAOYSA-L 0.000 description 1
- 238000003917 TEM image Methods 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000003242 anti bacterial agent Substances 0.000 description 1
- 229940088710 antibiotic agent Drugs 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- 230000003115 biocidal effect Effects 0.000 description 1
- 210000000170 cell membrane Anatomy 0.000 description 1
- 238000003759 clinical diagnosis Methods 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910000365 copper sulfate Inorganic materials 0.000 description 1
- MPTQRFCYZCXJFQ-UHFFFAOYSA-L copper(II) chloride dihydrate Chemical compound O.O.[Cl-].[Cl-].[Cu+2] MPTQRFCYZCXJFQ-UHFFFAOYSA-L 0.000 description 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 210000000805 cytoplasm Anatomy 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000000024 high-resolution transmission electron micrograph Methods 0.000 description 1
- 238000003018 immunoassay Methods 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 230000002458 infectious effect Effects 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 235000002867 manganese chloride Nutrition 0.000 description 1
- 239000011565 manganese chloride Substances 0.000 description 1
- 229940099607 manganese chloride Drugs 0.000 description 1
- 229940099596 manganese sulfate Drugs 0.000 description 1
- 235000007079 manganese sulphate Nutrition 0.000 description 1
- 239000011702 manganese sulphate Substances 0.000 description 1
- BEYCFZBNRLPHEP-UHFFFAOYSA-L manganese(II) chloride dihydrate Chemical compound O.O.[Cl-].[Cl-].[Mn+2] BEYCFZBNRLPHEP-UHFFFAOYSA-L 0.000 description 1
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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
- B01J27/02—Sulfur, selenium or tellurium; Compounds thereof
- B01J27/04—Sulfides
- B01J27/047—Sulfides with chromium, molybdenum, tungsten or polonium
- B01J27/051—Molybdenum
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
- A01N59/16—Heavy metals; Compounds thereof
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
- A01N59/16—Heavy metals; Compounds thereof
- A01N59/20—Copper
-
- 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
- B01J27/02—Sulfur, selenium or tellurium; Compounds thereof
- B01J27/04—Sulfides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Pest Control & Pesticides (AREA)
- Inorganic Chemistry (AREA)
- Agronomy & Crop Science (AREA)
- Plant Pathology (AREA)
- Health & Medical Sciences (AREA)
- Dentistry (AREA)
- General Health & Medical Sciences (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Environmental Sciences (AREA)
- Catalysts (AREA)
Abstract
The invention relates to sterilization technology, in particular to preparation and application of a photocatalyst with visible light sterilization performance. Mixing molybdenum salt, divalent metal salt and organic ligand, adding distilled water into the mixture, stirring uniformly, transferring into a reaction kettle, crystallizing for 8-12h at 100-140 ℃ to obtain a composite metal precursor; and uniformly mixing the obtained composite metal precursor and an S source, transferring the mixture into a reaction kettle, crystallizing at 160-200 ℃ for 12-16 hours, naturally cooling the reaction kettle to room temperature after the reaction is finished, and cleaning and drying the material for later use. The photocatalyst prepared by the invention has the advantages of simple synthesis method, low cost, remarkable performance and the like, and has wide application prospect in the field of photocatalysis sterilization.
Description
Technical Field
The invention relates to sterilization technology, in particular to preparation and application of a photocatalyst with visible light sterilization performance.
Background
The presence of pathogenic bacteria, whether in fresh water or seawater resources, is a serious hazard to human health. Although there are a large number of purified water bodies, antibacterial materials such as noble metals, antibiotics, and quaternary ammonium salts, etc., to inhibit or reduce the growth of infectious viruses and bacteria. However, these materials have low sterilization efficiency and long sterilization time, and may bring new concerns such as environmental pollution, antibiotic resistance, complicated preparation process and economic loss. Therefore, the selection of a new sterilization means has important significance.
Disclosure of Invention
The invention aims to provide a photocatalyst with visible light sterilization performance and a preparation method thereof.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a preparation method of photocatalyst with sterilization performance comprises the steps of mixing molybdenum salt, divalent metal salt and organic ligand, adding distilled water into the mixture, stirring uniformly, transferring into a reaction kettle, crystallizing for 8-12h at 100-140 ℃ to obtain a composite metal precursor; and uniformly mixing the obtained composite metal precursor and an S source, transferring the mixture into a reaction kettle, crystallizing at 160-200 ℃ for 12-16 hours, naturally cooling the reaction kettle to room temperature after the reaction is finished, and cleaning and drying the material for later use.
The organic ligand is 2-methylimidazole or 4, 4-bipyridine, and the added molar quantity is 0.5mmol-2mmol.
The addition amount of distilled water accounts for 3/5 of the volume of the reaction kettle.
The divalent metal salt is manganese salt, copper salt or cerium salt.
When the molybdenum salt and the manganese salt are mixed, mo in the molybdenum salt 2+ With Mn in manganese salt 2+ The molar ratio of (2) is 1.2:1;
when the molybdenum salt and the copper salt are mixed, mo in the molybdenum salt 2+ With Cu in copper salt 2+ The molar ratio of (2) is 1.1:1;
when the molybdenum salt and the cerium salt are mixed, mo in the molybdenum salt 2+ With Ce in cerium salts 2+ The molar ratio of (2) is 1:1.2.
The molybdenum salt is sodium molybdate or ammonium molybdate; the manganese salt is manganese chloride or manganese sulfate; the copper salt is copper sulfide or copper sulfate; the cerium salt is cerium nitrate.
The mass ratio of the composite metal precursor to the sulfur source is 2.2:1-1:2.2.
The S source is thioacetamide, thiourea or sodium sulfide nonahydrate.
The photocatalyst prepared by the method is applied to sterilization by utilizing visible light excitation.
The bacteria are escherichia coli and/or staphylococcus aureus.
Compared with the prior art, the invention has the following advantages and outstanding effects:
the photocatalyst is prepared by a two-step hydrothermal method, and has the effect of broad-spectrum sterilization by utilizing visible light. By XRD analysis, the material is MnS and MoS 2 is/CuS and MoS 2 Is a complex product of (2)/CeS 2 And MoS 2 Is a complex product of (a) and (b).
The development method has the advantages of low cost and simple preparation method; the prepared photocatalyst has the advantages of sunlight utilization, low cost, easy acquisition, simple preparation, wide application and the like. These advantages are critical to the application of the bactericide and environmental protection. The composite metal sulfide has potential application value in the fields of immunoassay, biological detection, clinical diagnosis and the like, and has wide application prospect in novel sterilization analysis.
Description of the drawings:
FIG. 1 is an XRD pattern of a photocatalyst according to an embodiment of the present invention, wherein A is MnS and MoS 2 Is a complex product of (a) and (b); b is CuS and MoS 2 Is a complex product of (a) and (b); c is CeS 2 And MoS 2 Is a complex product of (a) and (b);
fig. 2 is a TEM and HRTEM image of a photocatalyst according to an embodiment of the present invention;
FIG. 3 is a graph showing the optical performance of the photocatalyst provided by the embodiment of the present invention under the excitation of sunlight, wherein (A) is an ultraviolet diffuse reflection spectrum; (B) an optoelectronic signal; (C) an ac impedance plot; (D) a contact angle plot;
FIG. 4 is a diagram showing a sterilization mechanism of a photocatalyst according to an embodiment of the present invention, wherein A is an EPR signal test chart of Mo/Mn-S; b is an EPR signal test chart of Mo/Cu-S; c is an EPR signal test chart of Mo/Ce-S.
Fig. 5 is a broad-spectrum sterilization performance diagram of the photocatalyst under the excitation of sunlight, wherein a is a graph of sterilization rate against escherichia coli changing with illumination time, B is a graph of sterilization rate against staphylococcus aureus changing with illumination time, C is a dilution coating experiment flat-plate diagram against escherichia coli, and D is a dilution coating experiment flat-plate diagram against staphylococcus aureus.
Detailed Description
The present invention is further illustrated by the following specific examples, which are included to provide a more complete understanding of the present invention to those of ordinary skill in the art and are not intended to limit the invention in any way.
Example 1:
to the beaker, 5mmol sodium molybdate, 5mmol either of manganese chloride dihydrate/copper chloride/cerium nitrate, 2mmol of 4, 4-bipyridine and 60mL of ultrapure water were added, respectively, magnetically stirred for 30min, transferred to a 100mL hydrothermal reaction vessel, and crystallized at 120℃for 10h. Naturally cooling to room temperature after crystallization is finished, taking out the precursor, and centrifugally washing for 3 times by distilled water; centrifuging at 4500 rpm for 10min, washing, and drying at 60deg.C to obtain precursor.
To the beaker were added 1g of the precursor, 2g of sodium sulfide nonahydrate, 60mL of ultrapure water, respectively, magnetically stirred for 30min, dispersed uniformly, transferred to a 100mL hydrothermal reaction vessel, and vulcanized at 180℃for a certain period of time (see Table 1). After the reaction is finished, the reaction kettle is naturally cooled to room temperature, and is cleaned and dried according to the steps to obtain the composite metal sulfide (see figure 1).
TABLE 1
| Sequence of steps | Reaction time/h |
| 1 | 12 |
| 2 | 13 |
| 3 | 14 |
| 4 | 15 |
| 5 | 16 |
As can be seen from FIG. 1, the materials obtained after 14h are MnS and MoS 2 is/CuS and MoS 2 Is a complex product of (2)/CeS 2 And MoS 2 Is a complex product of (a) and (b). As can be seen from fig. 2, the composite metal sulfide has a lamellar structure, and the lamellar structure can provide a larger reaction contact area.
Application example 1
The strains to be tested are gram-negative bacteria (E.coli) and gram-positive bacteria (S.aureus), and the strains to be tested are respectively cultured to 10 according to the conventional mode 3 CFU/mL for use;
blank groups were added respectively to 10 3 CFU/mL gram negative bacteria (e.coli) and gram positive bacteria (s.aureus);
respectively adding 10 to the experimental group 3 CFU/mL of gram-negative bacteria (E.coli) and gram-positive bacteria (S.aureus), and 1mg/mL of the above-described example was added, respectively, to prepare the resulting photocatalyst.
The experimental group and the blank group were reacted under light for 120min, respectively. Then, 100. Mu.L of the solution was applied to a plate. The plates were incubated in a 30℃incubator for 36h.
As shown in fig. 3, a certain number of bacterial colonies grew in the blank group under light, demonstrating that light alone did not significantly affect the growth of bacteria. In the experimental group, after the photocatalyst is added under the illumination with the same intensity, bacterial communities gradually decrease along with the increase of illumination time, and the material has good sterilization performance under the excitation of illumination.
Meanwhile, as can be seen from fig. 4, three materials can generate superoxide radicals under illumination through the sterilization mechanism of the catalyst under illumination of ESR measurement experiments, and the superoxide radicals can oxidize cell membranes of bacteria, so that bacterial cytoplasm flows out, and finally bacterial death is caused.
Further, the sterilization test of the catalyst is verified to obtain the test of the sterilization performance of the Mo/Mn-S catalyst on staphylococcus aureus through a dilution coating experiment. As shown in fig. 5B and D, 100% killing of the bacteria can be achieved within 120min.
Claims (9)
1. A preparation method of a photocatalyst with sterilization performance is characterized by comprising the following steps: mixing molybdenum salt, divalent metal salt and organic ligand, adding distilled water into the mixture, stirring uniformly, transferring into a reaction kettle, crystallizing 8-12h at 100-140 ℃ to obtain a composite metal precursor; mixing the obtained composite metal precursor and sulfur source uniformly, transferring into a reaction kettle, crystallizing at 160-200deg.C for 12-16h, naturally cooling the reaction kettle to room temperature after the reaction is completed, cleaning, and oven drying the material to obtain CeS 2 And MoS 2 Is a complex product of (a) and (b);
the divalent metal salt is cerium salt;
the organic ligand is 4, 4-bipyridine.
2. The method for preparing the photocatalyst with sterilization performance according to claim 1, wherein: the molar amount of the organic ligand added is 0.5mmol to 2mmol.
3. The method for preparing the photocatalyst with sterilization performance according to claim 1, wherein: the addition amount of distilled water accounts for 3/5 of the volume of the reaction kettle.
4. A method for preparing a photocatalyst having bactericidal properties as set forth in claim 3, wherein:
when the molybdenum salt and the cerium salt are mixed, the molar ratio of molybdenum in the molybdenum salt to cerium in the cerium salt is 1:1.2.
5. The method for preparing a photocatalyst having bactericidal properties as set forth in claim 3 or 4, characterized in that: the molybdenum salt is sodium molybdate or ammonium molybdate, and the cerium salt is cerium nitrate.
6. The method for preparing the photocatalyst with sterilization performance according to claim 1, wherein: the mass ratio of the composite metal precursor to the sulfur source is 2.2:1-1:2.2.
7. The method for preparing a photocatalyst having bactericidal properties as set forth in claim 1 or 6, characterized in that: the sulfur source is thioacetamide, thiourea or sodium sulfide nonahydrate.
8. Use of a photocatalyst prepared by the method of claim 1, wherein: use of a photocatalyst prepared according to the method of claim 1 for sterilization by excitation with visible light.
9. The use according to claim 8, wherein: the bacteria are escherichia coli and/or staphylococcus aureus.
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