CN114618531A - 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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- CN114618531A CN114618531A CN202210193622.5A CN202210193622A CN114618531A CN 114618531 A CN114618531 A CN 114618531A CN 202210193622 A CN202210193622 A CN 202210193622A CN 114618531 A CN114618531 A CN 114618531A
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- 239000011941 photocatalyst Substances 0.000 title claims abstract description 29
- 230000001954 sterilising effect Effects 0.000 title claims abstract description 23
- 238000004659 sterilization and disinfection Methods 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- 239000002131 composite material Substances 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 150000002751 molybdenum Chemical class 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000002243 precursor Substances 0.000 claims abstract description 9
- 239000013110 organic ligand Substances 0.000 claims abstract description 7
- 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
- 238000001035 drying Methods 0.000 claims abstract description 5
- 150000003839 salts Chemical class 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 12
- 241000894006 Bacteria Species 0.000 claims description 9
- 230000000844 anti-bacterial effect Effects 0.000 claims description 9
- 241000588724 Escherichia coli Species 0.000 claims description 7
- 150000000703 Cerium Chemical class 0.000 claims description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical class [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 6
- 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
- 150000001879 copper Chemical class 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 239000011733 molybdenum Substances 0.000 claims description 6
- 241000191967 Staphylococcus aureus Species 0.000 claims description 5
- OMZSGWSJDCOLKM-UHFFFAOYSA-N copper(II) sulfide Chemical group [S-2].[Cu+2] OMZSGWSJDCOLKM-UHFFFAOYSA-N 0.000 claims description 5
- 230000005284 excitation Effects 0.000 claims description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical group [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 150000002696 manganese Chemical class 0.000 claims description 4
- 239000011572 manganese Substances 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
- LXBGSDVWAMZHDD-UHFFFAOYSA-N 2-methyl-1h-imidazole Chemical compound CC1=NC=CN1 LXBGSDVWAMZHDD-UHFFFAOYSA-N 0.000 claims description 2
- 229910052684 Cerium Inorganic materials 0.000 claims description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical class [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 229910021380 Manganese Chloride Inorganic materials 0.000 claims description 2
- GLFNIEUTAYBVOC-UHFFFAOYSA-L Manganese chloride Chemical group Cl[Mn]Cl GLFNIEUTAYBVOC-UHFFFAOYSA-L 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 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
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical class [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 229910000365 copper sulfate Inorganic materials 0.000 claims description 2
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 235000002867 manganese chloride Nutrition 0.000 claims description 2
- 239000011565 manganese chloride Substances 0.000 claims description 2
- 229940099607 manganese chloride Drugs 0.000 claims description 2
- 229940099596 manganese sulfate Drugs 0.000 claims description 2
- 235000007079 manganese sulphate Nutrition 0.000 claims description 2
- 239000011702 manganese sulphate Substances 0.000 claims description 2
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 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
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000001699 photocatalysis Effects 0.000 abstract 1
- 238000001308 synthesis method Methods 0.000 abstract 1
- 229910052961 molybdenite Inorganic materials 0.000 description 8
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 8
- 238000005286 illumination Methods 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000001580 bacterial effect Effects 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
- 229910052976 metal sulfide Inorganic materials 0.000 description 3
- 241000192125 Firmicutes Species 0.000 description 2
- 238000010586 diagram 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
- 238000003917 TEM image Methods 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 238000002441 X-ray diffraction Methods 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
- 230000003115 biocidal effect Effects 0.000 description 1
- 210000000170 cell membrane Anatomy 0.000 description 1
- 238000003759 clinical diagnosis Methods 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
- 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
- 239000000417 fungicide 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
- BEYCFZBNRLPHEP-UHFFFAOYSA-L manganese(II) chloride dihydrate Chemical compound O.O.[Cl-].[Cl-].[Mn+2] BEYCFZBNRLPHEP-UHFFFAOYSA-L 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000000746 purification Methods 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
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- 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
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- 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 a sterilization technology, in particular to a preparation method and an application of a photocatalyst with visible light sterilization performance. Mixing molybdenum salt, divalent metal salt and organic ligand, adding distilled water into the mixture, uniformly stirring, transferring the mixture into a reaction kettle, and crystallizing at the temperature of 100-; and uniformly mixing the obtained composite metal precursor and the S source, transferring the mixture into a reaction kettle, crystallizing the mixture at the temperature of 160-200 ℃ for 12-16h, 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 photocatalytic sterilization.
Description
Technical Field
The invention relates to a sterilization technology, in particular to a preparation method and an application of a photocatalyst with visible light sterilization performance.
Background
The existence of pathogenic bacteria in both fresh water and seawater resources seriously harms human health. Although there are a large number of water purification, antibacterial materials such as precious metals, antibiotics, and quaternary ammonium salts to inhibit or reduce the growth of infectious viruses and bacteria. However, these materials have low sterilization efficiency and long sterilization time, and may cause new concerns about environmental pollution, antibiotic resistance, complicated preparation process, and economic loss. Therefore, the selection of a new sterilization means is of great 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 purpose, the invention adopts the technical scheme that:
a preparation method of a photocatalyst with sterilization performance comprises the steps of mixing molybdenum salt, divalent metal salt and an organic ligand, adding distilled water into the mixture, uniformly stirring, transferring the mixture into a reaction kettle, and crystallizing at 140 ℃ for 8-12h to obtain a composite metal precursor; and uniformly mixing the obtained composite metal precursor and the S source, transferring the mixture into a reaction kettle, crystallizing the mixture at the temperature of 160-200 ℃ for 12-16h, 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 addition molar weight of the organic ligand is 0.5mmol-2 mmol.
The amount of the distilled water added was 3/5 based on the volume of the reaction vessel.
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 salt2+With Mn in manganese salt2+In a molar ratio of 1.2: 1;
when the molybdenum salt and the copper salt are mixed, Mo in the molybdenum salt2+With Cu in copper salts2+In a molar ratio of 1.1: 1;
when the molybdenum salt and the cerium salt are mixed, Mo in the molybdenum salt2+With Ce in cerium salts2+In a molar ratio of 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 application of the prepared photocatalyst is the application of the photocatalyst prepared by the method in sterilization by visible light excitation.
The bacteria are Escherichia coli and/or Staphylococcus aureus.
Compared with the prior art, the invention has the following advantages and prominent effects:
the photocatalyst is prepared by a two-step hydrothermal method, and has the effect of broad-spectrum sterilization by utilizing visible light. The material was MnS and MoS as analyzed by XRD2Composite products of/CuS and MoS2Composite product of (i)/CeS2And MoS2The composite product of (1).
The development method has the advantages of low cost and simple preparation method; the prepared photocatalyst has the advantages of utilization of sunlight, low price, easy obtaining, simple preparation, wide application and the like. These advantages are of great importance for the application of fungicides and for environmental protection. The composite metal sulfide obtained by the invention has potential application value in the fields of immunoassay, biological detection, clinical diagnosis and the like, and has wide application prospect in novel bactericidal analysis.
Description of the drawings:
FIG. 1 is an XRD pattern of a photocatalyst provided by an embodiment of the present invention, wherein A is MnS and MoS2The composite product of (a); b is CuS and MoS2The composite product of (a); c is CeS2And MoS2The composite product of (a);
FIG. 2 is a TEM and HRTEM image of the photocatalyst provided by the embodiment of the invention;
fig. 3 is a graph of optical performance of a photocatalyst provided by an embodiment of the present invention under excitation of sunlight, wherein (a) is a graph of an ultraviolet diffuse reflection spectrum; (B) a photoelectric signal; (C) an AC impedance plot; (D) a contact angle plot;
FIG. 4 is a diagram of a sterilization mechanism of the photocatalyst provided in the embodiment of the present invention, wherein A is an EPR signal test diagram 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 bactericidal performance graph of the photocatalyst under the excitation of sunlight, where a is a graph of bactericidal rate against escherichia coli as a function of illumination time, B is a graph of bactericidal rate against staphylococcus aureus as a function of illumination time, C is a dilution coating experiment flat sheet against escherichia coli, and D is a dilution coating experiment flat sheet against staphylococcus aureus.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to provide a more complete understanding of the invention by one of ordinary skill in the art, and are not intended to be limiting in any way.
Example 1:
respectively adding 5mmol of sodium molybdate, 5mmol of any one of manganese chloride dihydrate/copper chloride/cerium nitrate, 2mmol of 4, 4-bipyridine and 60mL of ultrapure water into a beaker, magnetically stirring for 30min, transferring to a 100mL hydrothermal reaction kettle, and crystallizing at 120 ℃ for 10 h. Naturally cooling to room temperature after crystallization, taking out the precursor, and centrifugally washing for 3 times by distilled water; centrifuging at 4500 rpm for 10min, washing, and drying at 60 deg.C to obtain precursor.
1g of precursor, 2g of sodium sulfide nonahydrate and 60mL of ultrapure water are respectively added into a beaker, magnetically stirred for 30min, uniformly dispersed, transferred into a 100mL hydrothermal reaction kettle, and vulcanized for a certain time at 180 ℃ (see Table 1). After the reaction is finished, the reaction kettle is naturally cooled to room temperature, and the composite metal sulfide is obtained by cleaning and drying according to the steps (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 MoS2Composite products of/CuS and MoS2Composite product of (i)/CeS2And MoS2The composite product of (1). As can be seen from fig. 2, the complex metal sulfide is of 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 degrees according to a conventional mode3CFU/mL for standby;
blank groups are added with 103CFU/mL of gram negative (e.coli) and gram positive (s.aureus);
10 are added into each experimental group3CFU/mL of gram-negative bacteria (e. coli) and gram-positive bacteria (s. aureus), and 1mg/mL of the photocatalyst prepared in the above example were added, respectively.
The experimental group and blank group were each exposed to light for 120 min. Then 100. mu.L of the solution was applied to a plate. The plate was incubated for 36h at 30 ℃ in an incubator.
As shown in FIG. 3, a certain number of bacterial colonies were grown in the blank group under light, demonstrating that the growth of bacteria is not significantly affected by the light alone. In the experimental group, under the illumination of the same intensity, after the photocatalyst is added, the bacterial community is gradually reduced along with the increase of the illumination time, and the material is proved to have good sterilization performance under the excitation of the illumination.
Meanwhile, through an ESR (equivalent series resistance) measurement experiment, the sterilization mechanism of the catalyst under illumination is shown in figure 4, and under illumination, the three materials can generate superoxide radicals which can oxidize the cell membrane of the bacteria, so that bacterial cytoplasm flows outwards, and finally the bacteria die.
Further, the catalyst is tested and verified to obtain a 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% kill of the bacteria was achieved within 120 min.
Claims (10)
1. A preparation method of a photocatalyst with sterilization performance is characterized in that: mixing molybdenum salt, divalent metal salt and organic ligand, adding distilled water into the mixture, uniformly stirring, transferring the mixture into a reaction kettle, and crystallizing at the temperature of 100-; and uniformly mixing the obtained composite metal precursor and the S source, transferring the mixture into a reaction kettle, crystallizing the mixture at the temperature of 160-200 ℃ for 12-16h, naturally cooling the reaction kettle to room temperature after the reaction is finished, and cleaning and drying the material for later use.
2. The method of claim 1 for preparing a photocatalyst having bactericidal properties, comprising: the organic ligand is 2-methylimidazole or 4, 4-bipyridine, and the addition molar weight of the organic ligand is 0.5mmol-2 mmol.
3. The method of claim 1 for preparing a photocatalyst having bactericidal properties, comprising: the addition amount of the distilled water accounts for 3/5 of the volume of the reaction kettle.
4. The method of claim 1 for preparing a photocatalyst having bactericidal properties, comprising: the divalent metal salt is manganese salt, copper salt or cerium salt.
5. The method of claim 4, wherein the photocatalyst has bactericidal properties, and the method comprises the steps of:
when the molybdenum salt and the manganese salt are mixed, Mo in the molybdenum salt2+With Mn in manganese salt2+In a molar ratio of 1.2: 1;
when the molybdenum salt and the copper salt are mixed, Mo in the molybdenum salt2+With Cu in copper salts2+In a molar ratio of 1.1: 1;
when the molybdenum salt and the cerium salt are mixed, Mo in the molybdenum salt2+With Ce in cerium salts2+In a molar ratio of 1: 1.2.
6. The method for preparing a photocatalyst having a sterilizing property according to claim 4 or 5, wherein: 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.
7. The method for preparing a photocatalyst having a sterilizing property as claimed in claim 1, wherein: the mass ratio of the composite metal precursor to the sulfur source is 2.2:1-1: 2.2.
8. The method for preparing a photocatalyst having a sterilizing property according to claim 1 or 7, wherein: the S source is thioacetamide, thiourea or sodium sulfide nonahydrate.
9. Use of a photocatalyst prepared as claimed in claim 1, wherein: use of a photocatalyst prepared according to the process of claim 1 for sterilization by visible light excitation.
10. Use of a photocatalyst prepared as described in claim 9, wherein: the method is characterized in that: the bacteria are Escherichia coli and/or Staphylococcus aureus.
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