Preparation method of easily degradable greenhouse film
By compounding single-atom-doped CeO2 samples with greenhouse films, the problem of single and difficult degradation of agricultural functional greenhouse films is solved, and a greenhouse film with good degradation performance and photocatalytic activity is prepared, which extends the service life and reduces soil pollution.
Patent Information
- Application Number
- CN202411542940.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2024-12-27
AI Technical Summary
The existing agricultural functional greenhouse membranes have fewer types and are single in functionality, which is difficult to meet the growth needs of crops and is difficult to effectively degrade, resulting in soil pollution problems.
Single-atom doped CeO2 samples were combined with the shed film, and the transition metal modified CeO2 nanomaterial was prepared by solvothermal method, and combined with polyvinyl chloride (PVC) particles to form a degradable shed through hydrothermal reaction and ultrasonic stirring. membrane.
The prepared greenhouse film has good degradation performance, extends service life, and performs excellently in photocatalytic activity and degradation performance. It can effectively reduce soil pollution, and is easy to operate and has low cost.
Smart Images
Figure CN119192637A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of energy environment and greenhouse film, and specifically relates to a preparation method and application of a composite of a prepared single-atom doped CeO2 sample and a greenhouse film. Background Art
[0002] my country has the highest coverage rate of greenhouse film in the world, with agricultural greenhouse film covering nearly 200,000 hectares. Films produced from PVC and PE resins are very suitable for my country's current agricultural production needs in terms of functionality and price, with huge development potential and good prospects.
[0003] In agriculture, greenhouses are an important tool to ensure the normal growth of crops. The main component of a greenhouse is the greenhouse film, but the existing agricultural functional greenhouse films are of few types and single functionality, which can hardly meet the growth needs of crops.
[0004] CN 118085420 A discloses an environmentally friendly agricultural degradable greenhouse film and a preparation method thereof. The environmentally friendly agricultural degradable greenhouse film is composed of seaweed polysaccharide composite biomass aerogel, TiO2 hollow sphere selenium-containing catalyst, low-density polyethylene and polyethylene glycol; the seaweed polysaccharide composite biomass aerogel is composed of seaweed polysaccharide, potato starch, lignin and activated carbon; the TiO2 hollow sphere selenium-containing catalyst is composed of colloidal carbon spheres, polybutyl titanate and selenium tetrachloride; the light-biodegradable composite film prepared by adding seaweed polysaccharide composite biomass aerogel, TiO2 hollow sphere selenium-containing catalyst and low-density polyethylene has more excellent mechanical properties and degradation properties, effectively reduces the pollution of soil caused by greenhouse film accumulation, and can also adsorb and remove heavy metals and organic pollutants in the soil, and has the effect of repairing the soil.
[0005] The present invention compounds the single-atom doped CeO2 sample with the greenhouse film, which can extend the service life of the greenhouse film and has good degradation performance. Summary of the invention
[0006] The present invention provides a method for preparing an easily degradable greenhouse film, wherein a single-atom doped CeO2 sample is compounded with the greenhouse film. The method is simple to operate, low in cost, and environmentally friendly, and the prepared greenhouse film has good degradation performance.
[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: A method for preparing an easily degradable greenhouse film comprises the following steps: (1) CeCl3 . 7H2O is placed in a solution prepared by a certain amount of anhydrous ethanol and water, and then a certain amount of metal salt is added, and the resulting mixture is stirred for 30 minutes to obtain solution A; (2) dissolving an appropriate amount of NaOH in a solution prepared by a certain amount of anhydrous ethanol and water and stirring on a magnetic stirrer until dissolved to obtain solution B; (3) adding solution B dropwise to solution A to obtain a mixture, which is then placed in a polytetrafluoroethylene liner for hydrothermal reaction and cooled to room temperature after the reaction is completed; the resulting precipitate is thoroughly washed with deionized water and anhydrous ethanol, placed in an oven overnight, dried and ground into powder to obtain metal single atom-doped CeO2 nanomaterials; (4) Dissolve an appropriate amount of polyvinyl chloride (PVC) particles in a certain amount of N,N-dimethylformamide (DMF) and stir magnetically to obtain a transparent solution C; (5) adding the metal single atom-doped CeO2 nanomaterial prepared in step (3) into an appropriate amount of DMF to obtain a uniform suspension D under the action of ultrasound; (6) Add the suspension D dropwise into the PVC solution C under magnetic stirring, and continue magnetic stirring to obtain a mixed solution; (7) Spread the mixed solution on a coating machine and dry it to obtain the final biodegradable greenhouse film.
[0008] Furthermore, the metal salt in step (1) is PdCl2, FeCl3, CuCl2 or AgCl, and the metal salt and CeCl3 . The molar ratio of 7H2O is (0.2-15):100.
[0009] Furthermore, in the solution prepared by a certain amount of anhydrous ethanol and water in step (1) and step (2), the volume ratio of anhydrous ethanol to water is 5:1.
[0010] Furthermore, in step (2), the concentration of NaOH in solution B is 10 mM-20 mM.
[0011] Furthermore, in step (3), the volume ratio of solution B to solution A is 1:1, the reaction temperature is 160° C., and the reaction time is 4 h.
[0012] Furthermore, the concentration of polyvinyl chloride (PVC) particles in the mixed solution of step (6) is 0.1 g / mL-0.2 g / mL.
[0013] Furthermore, the amount of the metal single atom-doped CeO2 nanomaterial added to the easily degradable greenhouse film accounts for 0.1 wt %-1 wt % of the polyvinyl chloride (PVC) particles.
[0014] Furthermore, the magnetic stirring time in step (6) is 6-8 hours.
[0015] Furthermore, in step (7), the temperature of the coating machine is set to 40-60°C.
[0016] Furthermore, the greenhouse film has good degradation performance, which can reach 12.3%.
[0017] The application of the easily degradable greenhouse film of the present invention in the fields of energy environment and greenhouse film technology.
[0018] The design principle of the present invention is as follows: a solvothermal method is used to make a transition metal raw material PdCl2 dissolved in a mixed solvent of water and ethanol react fully with CeCl3·7H2O and NaOH under high temperature and high pressure to obtain a transition metal modified CeO2 nanomaterial; an appropriate amount of polyvinyl chloride (PVC) particles is dissolved in N,N dimethylformamide (DMF), and a transparent solution C is obtained by magnetic stirring; a certain amount of Pd-CeO2 sample is added to an appropriate amount of DMF, and a uniform suspension D is obtained under the action of ultrasonic wave; the suspension D is added dropwise to the PVC solution C under magnetic stirring, and the magnetic stirring is continued to obtain a mixed solution; the mixed solution is spread on a coating machine and dried to obtain an easily degradable greenhouse film.
[0019] Compared with the prior art, the present invention has the following advantages and technical effects: 1. The present invention utilizes Pd to modify CeO2 to prepare single-atom doped nanomaterials with ultra-high photocatalytic activity.
[0020] 2. The present invention prepares a series of single-atom doped CeO2 nanomaterials, which is simple to operate and easy to control.
[0021] 3. The easily degradable greenhouse film prepared by the present invention has good degradation performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0023] Figure 1 XRD spectra of CeO2 and Pd-CeO2 prepared in Example 1 of the present invention; Figure 2 TEM spectrum of Pd-CeO2 prepared in Example 1 of the present invention; Figure 3 The bactericidal spectrum of a series of Pd-CeO2 samples prepared in Example 1 of the present invention for photocatalytic killing of Escherichia coli; Figure 4 The performance curve of 1% Pd-CeO2 photocatalytic degradation of phenol in Example 1 prepared by the present invention; Figure 5 The weight loss curve of the easily degradable greenhouse film prepared in Example 1 of the present invention; Figure 6 XRD spectra of CeO2 and Cu-CeO2 in Example 4 prepared by the present invention; Figure 7 This is the TEM spectrum of Cu-CeO2 prepared in Example 4 of the present invention. DETAILED DESCRIPTION
[0024] The present invention is further described below in conjunction with specific examples. It should be understood that the following examples are only used to illustrate the present invention and are not used to limit the scope of the present invention, and those skilled in the art in this field can make some non-essential improvements and adjustments based on the content of the above invention.
[0025] Example 1 This embodiment is a method for preparing an easily degradable greenhouse film, and the specific method is as follows: (1) CeCl3•7H2O was placed in a solution of 30 mL of anhydrous ethanol and water (volume ratio 5:1), and then 0.0106 g of PdCl2 was added. The resulting mixture was stirred for 30 minutes to obtain solution A, in which CeCl3 . The concentration of 7H2O was 6 mM, and the molar ratio of PdCl2:CeCl3•7H2O was 1:100; (2) Dissolve an appropriate amount of NaOH in 30 mL of a solution prepared by anhydrous ethanol and water (volume ratio 5:1) and stir on a magnetic stirrer until dissolved to obtain a solution B with a concentration of 18 mM. (3) Solution B was added dropwise to solution A to obtain a mixture, and the mixture was kept in a polytetrafluoroethylene liner at 160° C. for 4 hours, and then cooled to room temperature; the obtained precipitate was fully washed with deionized water and anhydrous ethanol, and then the material was placed in an oven overnight, dried and ground into powder to obtain a Pd-CeO2 sample, recorded as 1% Pd-CeO2, where 1% represents the mass fraction of Pd in CeO2; (4) Dissolve 5 g of polyvinyl chloride (PVC) particles in 45 mL of N,N-dimethylformamide (DMF) and stir magnetically to obtain a transparent solution C; (5) At the same time, 0.005 g of the 1% Pd-CeO2 sample prepared in step (3) was added to 5 mL of N,N-dimethylformamide (DMF) to obtain a uniform suspension D under the action of ultrasound; (6) Add suspension D dropwise into PVC solution C under magnetic stirring. At this time, the PVC concentration is 0.1 g / mL, and continue magnetic stirring to obtain a mixed solution. (7) The mixed solution was spread on a coating machine and dried to obtain the final easily degradable greenhouse film, which was recorded as PVC-0.1%Pd-CeO2 (where 0.1% is the mass fraction of the 1%Pd-CeO2 sample in PVC).
[0026] The preparation method of CeO2 sample is as follows: Take two clean beakers and prepare 30 mL of 6 mM CeCl3•7H2O solution (solution E) and 18 mM NaOH solution (solution F) respectively, and mix equal volumes of solution E and solution F; keep the resulting mixture in a polytetrafluoroethylene liner at 160°C for 4 hours and then cool to room temperature; the resulting precipitate is thoroughly washed with deionized water and anhydrous ethanol, and then the material is placed in an oven overnight, dried and ground into powder to obtain a CeO2 sample.
[0027] Example 2 This embodiment is a method for preparing an easily degradable greenhouse film, and the specific method is as follows: (1) CeCl3 . 7H2O was placed in a solution of 30 mL of anhydrous ethanol and water (volume ratio 5:1), and then 0.0106 g of PdCl2 was added. The resulting mixture was stirred for 30 minutes to obtain solution A, in which CeCl3 . The concentration of 7H2O was 6 mM, and the molar ratio of PdCl2:CeCl3•7H2O was 1:100; (2) Dissolve an appropriate amount of NaOH in 30 mL of a solution prepared by anhydrous ethanol and water (volume ratio 5:1) and stir on a magnetic stirrer until dissolved to obtain a solution B with a concentration of 18 mM. (3) Solution B was added dropwise to solution A to obtain a mixture, and the mixture was kept in a polytetrafluoroethylene liner at 160°C for 4 hours, and then cooled to room temperature; the obtained precipitate was fully washed with deionized water and anhydrous ethanol, and then the material was placed in an oven overnight, dried and ground into powder to obtain a Pd-CeO2 sample; recorded as 1% Pd-CeO2, where 1% represents the mass fraction of Pd in CeO2; (4) Dissolve 5 g of polyvinyl chloride (PVC) particles in 45 mL of N,N-dimethylformamide (DMF) and stir magnetically to obtain a transparent solution C; (5) At the same time, 0.015 g of the 1% Pd-CeO2 sample prepared in step (3) was added to 5 mL of N,N-dimethylformamide (DMF) to obtain a uniform suspension D under the action of ultrasound; (6) Add suspension D dropwise into PVC solution C under magnetic stirring. At this time, the PVC concentration is 0.1 g / mL, and continue magnetic stirring to obtain a mixed solution. (7) The mixed solution was spread on a coating machine and dried to obtain the final biodegradable greenhouse film, which was recorded as PVC-0.3%Pd-CeO2 (where 0.3% is the mass fraction of the 1%Pd-CeO2 sample in PVC).
[0028] Example 3 This embodiment is a method for preparing an easily degradable greenhouse film, and the specific method is as follows: (1) CeCl3 . 7H2O was placed in a solution of 30 mL of anhydrous ethanol and water (volume ratio 5:1), and then 0.0106 g of PdCl2 was added. The resulting mixture was stirred for 30 minutes to obtain solution A, in which CeCl3 . The concentration of 7H2O was 6 mM, and the molar ratio of PdCl2:CeCl3•7H2O was 1:100; (2) Dissolve an appropriate amount of NaOH in 30 mL of a solution prepared by anhydrous ethanol and water (volume ratio 5:1) and stir on a magnetic stirrer until dissolved to obtain a solution B with a concentration of 18 mM. (3) Solution B was added dropwise to solution A to obtain a mixture, and the mixture was kept in a polytetrafluoroethylene liner at 160° C. for 4 hours, and then cooled to room temperature; the obtained precipitate was fully washed with deionized water and anhydrous ethanol, and then the material was placed in an oven overnight, dried and ground into powder to obtain a Pd-CeO2 sample, recorded as 1% Pd-CeO2, where 1% represents the mass fraction of Pd in CeO2; (4) Dissolve 5 g of polyvinyl chloride (PVC) particles in 45 mL of N,N-dimethylformamide (DMF) and stir magnetically to obtain a transparent solution C; (5) At the same time, 0.025 g of the 1% Pd-CeO2 sample prepared in step (3) was added to 5 mL of N,N-dimethylformamide (DMF) to obtain a uniform suspension D under the action of ultrasound; (6) Add suspension D dropwise into PVC solution C under magnetic stirring. At this time, the PVC concentration is 0.1 g / mL, and continue magnetic stirring to obtain a mixed solution. (7) The mixed solution was spread on a coating machine and dried to obtain the final biodegradable greenhouse film, which was recorded as PVC-0.5%Pd-CeO2 (where 0.5% is the mass fraction of the 1%Pd-CeO2 sample in PVC).
[0029] Based on Example 1, the amount of PdCl2 was adjusted to 0.0032 g, 0.0053 g, 0.0075 g and 0.0213 g to obtain 0.3% Pd-CeO 2、 0.5%Pd-CeO 2、 0.7%Pd-CeO 2、2% Pd-CeO2. The XRD spectrum of Pd-CeO2 prepared by the present invention is as follows Figure 1 As shown in Figure 2, the characteristic diffraction peaks of the synthesized sample are consistent with the CeO2 standard card, and there are no impurity peaks, and the crystallinity is good. Through TEM images with different magnifications ( Figure 2 ) The morphology of the Pd-CeO2 sample can be clearly observed. The particles are evenly dispersed without agglomeration, and the average particle size is about 5 nm.
[0030] Escherichia coli (2 × 10 7 CFU / mL) was used as the model bacteria to evaluate the bactericidal performance of the samples. Figure 3 Escherichia coli under a light intensity of 30 mw / cm 2 The survival rate curve under the conditions. After 150 min of illumination, the survival rate of bacteria in pure CeO2 is still as high as 66.15%. It can be clearly seen that the Pd ion-doped material shows better photocatalytic activity than CeO2. Among them, the 1% Pd-CeO2 material has the most significant effect on the survival rate of bacteria, reducing 7 log CFU / mL in 125 min.
[0031] In view of the best control effect of 1% Pd-CeO2 material on bacteria, the selected materials were used to degrade phenol under visible light conditions to further evaluate their photocatalytic reduction activity. The reaction conditions of the system were phenol initial concentrations of 5 mg / L, 10 mg / L, and 20 mg / L, catalyst dosage of 20 mg, and pH of the original 6.23. Figure 4 As shown in Figure 2, when the pollutant concentrations were 5 mg / L, 10 mg / L, and 20 mg / L, the photocatalytic removal rates were 89.0%, 59.6%, and 28.7% respectively after 150 minutes of visible light irradiation. Figure 5 The figure shows the weight loss curve of the prepared easily degradable greenhouse film within 120 hours of photocatalytic reaction. The experimental results show that the PVC-0.1%Pd-CeO2 film prepared in Example 1 of the present invention has the best degradation effect, which can reach 12.3%.
[0032] Example 4 This embodiment is a method for preparing an easily degradable greenhouse film, and the specific method is as follows: (1) CeCl3 . 7H2O was placed in a solution of 30 mL of anhydrous ethanol and water (volume ratio 5:1), and then 0.103 g of CuCl2 was added. The resulting mixture was stirred for 30 minutes to obtain solution A, in which CeCl3 . The concentration of 7H2O was 6 mM, and the molar ratio of CuCl2:CeCl3•7H2O was 1:10; (2) Dissolve an appropriate amount of NaOH in 30 mL of a solution prepared by anhydrous ethanol and water (volume ratio 5:1) and stir on a magnetic stirrer until dissolved to obtain a solution B with a concentration of 18 mM. (3) Solution B was added dropwise to solution A to obtain a mixture, and the mixture was kept in a polytetrafluoroethylene liner at 160°C for 4 hours, and then cooled to room temperature; the obtained precipitate was fully washed with deionized water and anhydrous ethanol, and then the material was placed in an oven overnight, dried and ground into powder to obtain a Cu-CeO2 sample, recorded as 10% Cu-CeO2, where 10% represents the mass fraction of Cu in CeO2; (4) Dissolve 5 g of polyvinyl chloride (PVC) particles in 45 mL of N,N-dimethylformamide (DMF) and stir magnetically to obtain a transparent solution C; (5) At the same time, 0.015 g of the 10% Cu-CeO2 sample prepared in step (3) was added to 5 mL of N,N-dimethylformamide (DMF) to obtain a uniform suspension D under the action of ultrasound; (6) Add suspension D dropwise into PVC solution C under magnetic stirring. At this time, the PVC concentration is 0.1 g / mL, and continue magnetic stirring to obtain a mixed solution. (7) Spread the mixed solution on a coating machine and dry it to obtain the final biodegradable greenhouse film.
[0033] On the basis of Example 4, the amount of CuCl2 was adjusted to 0.0103g, 0.0309g, 0.0515g and 0.0721g, respectively, to obtain 1% Cu-CeO2, 3% Cu-CeO2, 5% Cu-CeO2 and 7% Cu-CeO2. The XRD spectrum of Cu-CeO2 prepared by the present invention is as follows: Figure 6 As shown in the figure, the crystallinity of the synthesized sample is good and there is no impurity peak. As the doping ratio of Cu increases, the main peak position of CeO2 will shift to the left. Through TEM images with different magnifications ( Figure 7 ) The morphology of the Cu-CeO2 sample can be clearly observed. No agglomeration occurs and no Cu element appears, which is consistent with the XRD results.
[0034] Example 5 This embodiment is a method for preparing an easily degradable greenhouse film, and the specific method is as follows: (1) CeCl3 . 7H2O was placed in a solution of 30 mL of anhydrous ethanol and water (volume ratio 5:1), and then 0.0097 g of FeCl3 was added. The resulting mixture was stirred for 30 minutes to obtain solution A, in which CeCl3 .The concentration of 7H2O was 6 mM, and the molar ratio of FeCl3:CeCl3•7H2O was 1:100; (2) Dissolve an appropriate amount of NaOH in 30 mL of a solution prepared by anhydrous ethanol and water (volume ratio 5:1) and stir on a magnetic stirrer until dissolved to obtain a solution B with a concentration of 18 mM. (3) Solution B was added dropwise to solution A to obtain a mixture, and the mixture was kept in a polytetrafluoroethylene liner at 160°C for 4 hours and then cooled to room temperature; the obtained precipitate was fully washed with deionized water and anhydrous ethanol, and then the material was placed in an oven overnight, dried and ground into powder to obtain a Fe-CeO2 sample; (4) Dissolve 5 g of polyvinyl chloride (PVC) particles in 45 mL of N,N-dimethylformamide (DMF) and stir magnetically to obtain a transparent solution C; (5) At the same time, 0.015 g of the Fe-CeO2 sample prepared in step (3) was added to 5 mL of N,N-dimethylformamide (DMF) to obtain a uniform suspension D under the action of ultrasound; (6) Add suspension D dropwise into PVC solution C under magnetic stirring. At this time, the PVC concentration is 0.1 g / mL, and continue magnetic stirring to obtain a mixed solution. (7) Spread the mixed solution on a coating machine and dry it to obtain the final biodegradable greenhouse film.
[0035] Example 6 This embodiment is a method for preparing an easily degradable greenhouse film, and the specific method is as follows: (1) CeCl3 . 7H2O was placed in a solution of 30 mL of anhydrous ethanol and water (volume ratio 5:1), and then 0.0086 g of AgCl was added. The resulting mixture was stirred for 30 minutes to obtain solution A, in which CeCl3 . The concentration of 7H2O was 6 mM, and the molar ratio of AgCl:CeCl3•7H2O was 1:100; (2) Dissolve an appropriate amount of NaOH in 30 mL of a solution prepared by anhydrous ethanol and water (volume ratio 5:1) and stir on a magnetic stirrer until dissolved to obtain a solution B with a concentration of 18 mM. (3) adding solution B dropwise to solution A to obtain a mixture, maintaining the mixture in a polytetrafluoroethylene liner at 160° C. for 4 hours, and then cooling to room temperature; the obtained precipitate was fully washed with deionized water and anhydrous ethanol, and then the material was placed in an oven overnight, dried and ground into powder to obtain an Ag-CeO2 sample; (4) Dissolve 5 g of polyvinyl chloride (PVC) particles in 45 mL of N,N-dimethylformamide (DMF) and stir magnetically to obtain a transparent solution C; (5) At the same time, 0.015 g of the Ag-CeO2 sample prepared in step (3) was added to 5 mL of N,N-dimethylformamide (DMF) to obtain a uniform suspension D under the action of ultrasound; (6) Add suspension D dropwise into PVC solution C under magnetic stirring. At this time, the PVC concentration is 0.1 g / mL, and continue magnetic stirring to obtain a mixed solution. (7) Spread the mixed solution on a coating machine and dry it to obtain the final biodegradable greenhouse film.
[0036] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.
Claims
1. A method for preparing an easily degradable greenhouse film, characterized in that The steps include: (1) CeCl3 . 7H2O is placed in a solution prepared by a certain amount of anhydrous ethanol and water, and then a certain amount of metal salt is added, and the resulting mixture is stirred for 30 minutes to obtain solution A; (2) dissolving an appropriate amount of NaOH in a solution prepared by a certain amount of anhydrous ethanol and water and stirring on a magnetic stirrer until dissolved to obtain solution B; (3) adding solution B dropwise to solution A to obtain a mixture, which is then placed in a polytetrafluoroethylene liner for hydrothermal reaction and cooled to room temperature after the reaction is completed; the obtained precipitate is thoroughly washed with deionized water and anhydrous ethanol, placed in an oven overnight, dried and ground into powder to obtain metal single atom-doped CeO2 nanomaterials; (4) Dissolve an appropriate amount of polyvinyl chloride (PVC) particles in a certain amount of N,N-dimethylformamide (DMF) and stir magnetically to obtain a transparent solution C; (5) adding the metal single atom-doped CeO2 nanomaterial prepared in step (3) into an appropriate amount of DMF to obtain a uniform suspension D under the action of ultrasound; (6) Add the suspension D dropwise into the PVC solution C under magnetic stirring, and continue magnetic stirring to obtain a mixed solution; (7) Spread the mixed solution on a coating machine and dry it to obtain the final biodegradable greenhouse film.
2. The method for preparing the easily degradable greenhouse film according to claim 1, characterized in that: The metal salt in step (1) is PdCl2, FeCl3, CuCl2 or AgCl, and the metal salt and CeCl3 . The molar ratio of 7H2O is (0.2-15):
100.
3. The method for preparing the easily degradable greenhouse film according to claim 1, characterized in that: In the solution prepared by a certain amount of anhydrous ethanol and water in step (1) and step (2), the volume ratio of anhydrous ethanol to water is 5:
1.
4. The method for preparing the easily degradable greenhouse film according to claim 1, characterized in that: The concentration of NaOH in solution B in step (2) is 10 mM-20 mM.
5. The method for preparing the easily degradable greenhouse film according to claim 1, characterized in that: In step (3), the volume ratio of solution B to solution A is 1:1, the reaction temperature is 160° C., and the reaction time is 4 h.
6. The method for preparing the easily degradable greenhouse film according to claim 1, characterized in that: The concentration of polyvinyl chloride (PVC) particles in the mixed solution of step (6) is 0.1 g / mL-0.2 g / mL.
7. The method for preparing the easily degradable greenhouse film according to claim 1, characterized in that: The amount of the metal single atom doped CeO2 nanomaterial added to the easily degradable greenhouse film accounts for 0.1 wt %-1 wt % of the polyvinyl chloride (PVC) particles.
8. The method for preparing the easily degradable greenhouse film according to claim 1, characterized in that: The magnetic stirring time in step (6) is 6-8 hours.
9. The method for preparing the easily degradable greenhouse film according to claim 1, characterized in that: In step (7), the temperature of the coating machine is set to 40-60°C.
10. The method for preparing the easily degradable greenhouse film according to claim 1, characterized in that: The greenhouse film has good degradation performance, which can reach 12.3%.