CN108031481B - Ultrathin bismuth oxyhalide nanosheet photocatalyst stripped by silver intercalation and preparation method thereof - Google Patents
Ultrathin bismuth oxyhalide nanosheet photocatalyst stripped by silver intercalation and preparation method thereof Download PDFInfo
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- 239000002135 nanosheet Substances 0.000 title claims abstract description 67
- 238000009830 intercalation Methods 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 19
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 16
- 239000004332 silver Substances 0.000 title claims abstract description 16
- 230000002687 intercalation Effects 0.000 title abstract description 14
- 229910052797 bismuth Inorganic materials 0.000 title description 2
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 title description 2
- 238000000034 method Methods 0.000 claims abstract description 15
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 7
- 230000006911 nucleation Effects 0.000 claims abstract description 3
- 238000010899 nucleation Methods 0.000 claims abstract description 3
- 238000007540 photo-reduction reaction Methods 0.000 claims abstract description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 51
- 235000019441 ethanol Nutrition 0.000 claims description 16
- 239000000243 solution Substances 0.000 claims description 14
- 239000007864 aqueous solution Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 230000002378 acidificating effect Effects 0.000 claims description 5
- 239000000047 product Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- 101710134784 Agnoprotein Proteins 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 229940057838 polyethylene glycol 4000 Drugs 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 239000002244 precipitate Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 230000001376 precipitating effect Effects 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims 2
- 230000035484 reaction time Effects 0.000 claims 1
- 238000000926 separation method Methods 0.000 claims 1
- 230000001699 photocatalysis Effects 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000007146 photocatalysis Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 238000003786 synthesis reaction Methods 0.000 abstract description 2
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 description 8
- 229940043267 rhodamine b Drugs 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 239000010410 layer Substances 0.000 description 4
- 239000002064 nanoplatelet Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000004299 exfoliation Methods 0.000 description 3
- 239000002086 nanomaterial Substances 0.000 description 3
- 239000002243 precursor Substances 0.000 description 3
- 238000001291 vacuum drying Methods 0.000 description 3
- 229910052724 xenon Inorganic materials 0.000 description 3
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000004630 atomic force microscopy Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000000445 field-emission scanning electron microscopy Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000005411 Van der Waals force Methods 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- 238000004577 artificial photosynthesis Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
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- 150000001875 compounds Chemical class 0.000 description 1
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- 238000005286 illumination Methods 0.000 description 1
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- 150000002902 organometallic compounds Chemical class 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 1
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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
- B01J27/06—Halogens; Compounds thereof
- B01J27/08—Halides
-
- B01J35/39—
-
- B01J35/40—
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/04—Mixing
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
Abstract
The invention discloses an ultrathin Bi prepared by a silver intercalation stripping method12O17Cl2A nano-sheet photocatalyst and application thereof belong to the field of photocatalysis. By using Ag+And Cl‑The Ag is self-assembled in ethanol water solution under strong action force+Insert block Bi12O17Cl2[ Bi ] of12O17]2+And [ Cl2]2‑Interlaminar and photoreduction of Ag+Converted into Ag simple substance, and the bulk Bi is formed along with nucleation and growth of the Ag simple substance between layers12O17Cl2The nano-sheets are gradually stripped into ultrathin nano-sheets. The preparation method has the advantages of simple and convenient operation, low raw material cost, low energy consumption, realization of large-scale preparation and the like, and belongs to a green synthesis technology.
Description
Technical Field
The invention belongs to the field of photocatalysis, and particularly relates to ultrathin Bi prepared through silver intercalation stripping12O17Cl2A nano-sheet photocatalyst, a preparation method and application thereof.
Background
With the rapid development of economy in China, the problems of environmental deterioration and energy shortage are increasingly highlighted. The two problems are solved, and the urgent needs of realizing sustainable development, improving the life quality of people and guaranteeing the national safety are met. The photocatalytic technology is considered to be one of the ideal solar energy conversion technologies in water treatment, air purification, water decomposition for hydrogen production, CO2The method has potential advantages in the fields of reduction, artificial photosynthesis and the like.
Two-dimensional nanomaterials are a new class of materials with infinite planar dimensions, which can be considered as materials obtained by thinning a three-dimensional crystal down to the thickness of one or several atomic layers. Due to the unique thickness dimension and structural characteristics, not only can the intrinsic properties of the material be enhanced, but also new characteristics which are not possessed by bulk phase materials may be generated.
The photocatalytic redox reaction is carried out at the surface, so that the exposed surface structure of the semiconductor material has a decisive effect on its photocatalytic activity. The two-dimensional nano material has the characteristics of high specific surface area, high exposure proportion of active sites, extremely small migration distance of bulk photon-generated carriers and the like, and has potential application prospect in the aspect of photocatalytic application.
The preparation methods of the laminar two-dimensional nano-material reported so far mainly comprise a mechanical stripping method, a liquid-phase ultrasonic stripping method and an intercalation stripping method. Among them, the mechanical peeling method has low yield and is difficult to control in size; the liquid phase peeling method also has disadvantages such as low peeling efficiency and difficulty in controlling the thickness. The intercalation stripping method has relatively high yield, and the synthesized nano sheet has controllable thickness. The most widely used intercalation and exfoliation method is lithium intercalation and exfoliationLi J, Zhan G, Yu Y, et al. Superior visible light hydrogen evolution of Janus bilayer junctions via atomic-level charge flow steering[J]. Nature communications, 2016, 7.) However, the lithium intercalation reagent is usually a metal organic compound, and such a compound is very active and is very reactive with water and oxygen, which results in severe reaction conditions. Therefore, there is a need to find more suitable intercalating species, andsilver intercalation exfoliation rules may solve these problems well.
Disclosure of Invention
The invention aims to provide an ultrathin Bi prepared by silver intercalation aiming at the defects of the prior art12O17Cl2A method of nano-sheet material.
In order to solve the above purpose, the invention adopts the following technical scheme:
(1) preparation of bulk Bi12O17Cl2Nano-sheet
Adding BiCl at room temperature3Adding into weakly acidic ethanol aqueous solution, adding polyethylene glycol 4000, dissolving completely, adding into strongly basic ethanol aqueous solution dropwise to obtain mixed solution, stirring, transferring into polytetrafluoroethylene reaction kettle, heating to 80 deg.C ~ 160 deg.C, maintaining for 2 ~ 5 h, naturally cooling to room temperature, washing with deionized water and anhydrous ethanol for several times, centrifuging, precipitating, collecting, and vacuum drying at 60 ~ 80 deg.C;
(2) preparation of ultra-thin Bi12O17Cl2Nano-sheet
The block Bi obtained in the step (1)12O17Cl2The nano-sheet is ultrasonically dispersed in ethanol water solution, and then AgNO is subjected to shading condition3The aqueous ethanol solution was added dropwise, stirred at room temperature for 0.5 ~ 2 h, and then illuminated (lambda)>= 420 nm) for 0.5 ~ 2 h, centrifugally separated, washed by deionized water, and dried in vacuum to obtain ultrathin Bi12O17Cl2A nanosheet photocatalyst;
the volume ratio of ethanol to water in the ethanol water solution is 1: 1;
the weakly acidic ethanol aqueous solution in the step (1) is an ethanol aqueous solution adjusted by dilute HCl, and the pH =4 ~ 6;
the strongly alkaline ethanol aqueous solution in the step (1) is an ethanol aqueous solution adjusted by NaOH or KOH, and has the pH =12 ~ 14.
Ultrathin Bi prepared in step (2)12O17Cl2The mass fraction of silver in the nanosheets is 0.1% ~ 1%.
Block Bi12O17Cl2The thickness of the nanoplatelets is 20 ~ 40 nm.
Ultra-thin Bi12O17Cl2The thickness of the nanosheets was 3 ~ 4 nm.
The invention provides the ultrathin Bi12O17Cl2Nanosheet photocatalyst and ultrathin Bi prepared by preparation method12O17Cl2The application of the nanosheet photocatalyst in degrading rhodamine B. The application comprises the following steps: the ultra-thin Bi12O17Cl2Mixing and adsorbing the nanosheet photocatalyst and the rhodamine B solution under a light-proof condition; the mixed solution is irradiated under a xenon lamp of 300W (lambda)>= 420 nm) for 5-60 min to finish the degradation of rhodamine B.
The innovation points of the invention are as follows: the invention firstly proposes that the method for preparing the ultrathin Bi by adopting silver intercalation stripping12O17Cl2The method not only realizes thickness regulation, but also successfully introduces silver elementary substance between the nanosheets, and under the coupling action of the two factors, the ultrathin Bi is obtained12O17Cl2The photocatalytic performance of the nanosheets is comparable to bulk Bi12O17Cl2The nano-sheet is greatly improved.
Compared with the prior art, the invention has the advantages that:
(1) the invention firstly utilizes Ag+And Cl-Under the condition of strong force, Ag is prepared by self-assembly technology in ethanol water solution+Insert block Bi12O17Cl2Nanosheet [ Bi ]12O17]2+And [ Cl2]2-Interlaminar and photoreduction of Ag+Converted into Ag simple substance, Bi grows along with nucleation of the Ag simple substance between layers12O17Cl2The interlayer spacing of the nano-sheets is increased, and the Van der Waals force between the layers is weakened, so that the Bi can be stripped12O17Cl2The function of the nano-sheet. The preparation method has the advantages of simple and convenient operation, low cost of raw materials, low energy consumption, realization of large-scale preparation and the like, and belongs to a green synthesis technology;
(2) the ultrathin Bi of the invention12O17Cl2The nano-sheet photocatalyst has excellent photocatalytic effect, and the ultrathin Bi is obtained under the same conditions12O17Cl2The nanosheet photocatalyst catalyzes and degrades 87.2 percent of rhodamine B within 20 min, and the block Bi12O17Cl2The nano-sheet photocatalyst only catalyzes and degrades 38.0 percent within 20 min.
Drawings
FIG. 1 shows bulk Bi synthesized in example 112O17Cl2Nanosheet (BOC), ultra-thin Bi12O17Cl2Field emission scanning electron microscopy (FE-SEM) of nanoplatelets (U-BOC).
FIG. 2 shows bulk Bi synthesized in example 112O17Cl2Nanosheet (BOC), ultra-thin Bi12O17Cl2Atomic Force Microscopy (AFM) of nanoplatelets (U-BOC).
FIG. 3 shows bulk Bi synthesized in example 112O17Cl2Nanosheet (BOC), ultra-thin Bi12O17Cl2X-ray powder diffraction Pattern (XRD) of the nanoplatelets (U-BOC).
FIG. 4 shows bulk Bi synthesized in example 112O17Cl2Nanosheet (BOC), ultra-thin Bi12O17Cl2A rate diagram of photocatalytic degradation of rhodamine B by nanosheet (U-BOC).
Detailed Description
In order to more clearly and completely describe the present invention, some embodiments will be described in detail below with reference to the accompanying drawings.
Example 1
Preparation:
the first step is as follows: preparation of bulk Bi12O17Cl2Nanosheet (BOC)
(1) Preparing a reaction precursor solution: 2.5 mmol of BiCl at room temperature3Dissolving in 25 mL of weakly acidic ethanol aqueous solution (pH = 5), adding 1 g of polyethylene glycol 4000, and completely dissolvingAfter decomposition, 25 mL of strongly basic ethanol aqueous solution (pH = 13) is added dropwise, and the mixture is fully stirred for 1 h to form a reaction precursor solution;
(2) hydrothermal reaction: transferring the obtained precursor solution into a polytetrafluoroethylene reaction kettle with the capacity of 100 mL, heating to 120 ℃, and preserving heat for 3 hours;
(4) washing and collecting the precipitate: naturally cooling the product to room temperature, washing with deionized water and absolute ethyl alcohol for several times, centrifuging, collecting precipitate, and vacuum drying at 60 deg.C to obtain block Bi12O17Cl2Nanosheets.
The second step is that: preparation of ultra-thin Bi of Ag intercalation12O17Cl2Nanosheet (U-BOC)
The block Bi obtained in the first step12O17Cl2The nano-sheet is dispersed in 50 mL ethanol water solution by ultrasonic, and 50 mL AgNO is added under the condition of keeping out of the sun3Adding 90 mg/L ethanol aqueous solution dropwise, stirring for 2 h, placing under a xenon lamp equipped with a 420 nm optical filter for illumination for 1 h, centrifugally separating the obtained product, washing with deionized water, and vacuum drying at 60 ℃ to obtain Ag intercalated ultrathin Bi12O17Cl2Nanosheets.
The application comprises the following steps:
weighing 30 mg of ultrathin Bi12O17Cl2Adding the nanosheet photocatalyst into 60 mL of 5 mg/L rhodamine B solution, stirring and adsorbing for 1 h under a dark condition, providing a visible light source by using a xenon lamp provided with a 420 nm optical filter, and researching the degradation condition of rhodamine B. As shown in FIG. 4, under the same conditions, ultra-thin Bi12O17Cl2The nanosheet photocatalyst catalyzes and degrades 87.2 percent of rhodamine B within 20 min, and Bi12O17Cl2The nano-sheet photocatalyst only catalyzes and degrades 38.0 percent within 20 min.
Example 2
The bulk Bi obtained in example 112O17Cl2Nanosheets and ultrathin Bi12O17Cl2The nanosheets were respectively subjected to field emission scanning electron microscope characterization, and the results are shown in fig. 1. It can be seen that through silver insertionAfter layer treatment, Bi12O17Cl2The thickness of the nano-sheet is obviously changed, and the thickness of the ultrathin nano-sheet is within 10 nm.
Example 3
The bulk Bi obtained in example 112O17Cl2Nanosheets and ultrathin Bi12O17Cl2And nanosheets, each subjected to atomic force microscopy characterization, as shown in fig. 2. From the figure, it can be seen that bulk Bi12O17Cl2The thickness of the thick nano-sheet is between 20 ~ 40 nm, and the thickness of the nano-sheet obtained after silver intercalation treatment is about 3 ~ 4 nm12O17Cl2Nanosheets.
Example 4
The bulk Bi obtained in example 112O17Cl2Nanosheets and ultrathin Bi12O17Cl2The nanosheets were analyzed by X-ray diffraction, and the results are shown in fig. 3. Proves that the method for stripping silver intercalation provided by the invention does not change Bi12O17Cl2The crystal form, but the peak intensity of the {0012} plane is obviously enhanced, probably because the {0012} plane is more exposed in the thinning process of the nanosheet, the crystal plane orientation is changed.
The above description is only for the purpose of illustrating the present invention and is not intended to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the present invention without creative efforts.
Claims (4)
1. Ultrathin Bi stripped by silver intercalation12O17Cl2The preparation method of the nanosheet photocatalyst is characterized by comprising the following steps of: by using Ag+And Cl- The Ag is self-assembled in ethanol water solution under strong action force+Insert block Bi12O17Cl2[ Bi ] of12O17]2+And [ Cl2]2-Interlaminar and photoreduction of Ag+Converted into Ag simple substance, and the bulk Bi is formed along with nucleation and growth of the Ag simple substance between layers12O17Cl2The nano sheets are gradually stripped into ultrathin nano sheets; the method comprises the following two steps:
(1) preparation of bulk Bi12O17Cl2Nano-sheet
2.5 mmol of BiCl3Adding the mixture into 25 mL of weakly acidic ethanol aqueous solution, then adding 1 g of polyethylene glycol 4000, after completely dissolving, dropwise adding 25 mL of strongly basic ethanol aqueous solution to obtain mixed solution, uniformly stirring, transferring the mixed solution into a polytetrafluoroethylene reaction kettle, and carrying out hydrothermal reaction; naturally cooling the obtained product to room temperature, washing the product with deionized water and absolute ethyl alcohol for multiple times respectively, centrifugally precipitating, collecting and drying the precipitate;
(2) preparation of ultra-thin Bi12O17Cl2Nano-sheet
The block Bi obtained in the step (1)12O17Cl2The nano-sheets are ultrasonically dispersed in 50 mL ethanol water solution, and then AgNO is subjected to shading3Dropwise adding an ethanol water solution, stirring at room temperature and illuminating to strip the block into nanosheets; the product is washed by deionized water after centrifugal separation and dried in vacuum to prepare the ultrathin Bi12O17Cl2A nanosheet photocatalyst;
the pH value of the weak acidic ethanol aqueous solution in the step (1) is 4 ~ 6;
the pH value of the strong alkaline ethanol aqueous solution in the step (1) is 12 ~ 14;
ultra-thin Bi12O17Cl2The thickness of the nano-sheet is 3 ~ 4 nm, the hydrothermal reaction temperature in the step (1) is 80 ℃, ~ 160 ℃, the hydrothermal reaction time is 2 ~ 5 h, and the ultrathin Bi prepared in the step (2)12O17Cl2The mass fraction of silver in the nanosheets is 0.1% ~ 1%.
2. The ultra-thin Bi of claim 1 stripped from silver intercalation12O17Cl2The preparation method of the nanosheet photocatalyst is characterized by comprising the following steps of: the volume ratio of ethanol to water in the ethanol water solution is 1: 1.
3. The ultra-thin Bi of claim 1 stripped from silver intercalation12O17Cl2The preparation method of the nanosheet photocatalyst is characterized by comprising the following steps of: step (1) Block Bi12O17Cl2The drying temperature of the nano-sheets is 60 ℃ and ~ 100 ℃ is 100 ℃.
4. The ultra-thin Bi of claim 1 stripped from silver intercalation12O17Cl2The preparation method of the nanosheet photocatalyst is characterized by comprising the following steps of: step (2) ultra-thin Bi12O17Cl2The light wavelength of the nanosheet is 200 nm ~ 700 nm during the nanosheet peeling operation, and the peeling time is 0.5-3 h.
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