A photochemical method for high selective removal of organophosphorus pollutants from water

Abstract

The application discloses a photochemical method for removing organic phosphorus pollutants in water bodies with high selectivity, and belongs to the field of water treatment. The application realizes high-selectivity photocatalytic oxidation of HEDP into orthophosphate without adding an oxidant by using a bismuth vanadate photocatalyst loaded with copper nanoparticles. The method of the application improves the problems in the prior art, such as the need to add a large amount of oxidant and the difficulty in separating reaction products, and provides a new strategy for the high-selectivity oxidation and removal of organic phosphorus pollutants in water bodies. The bismuth vanadate photocatalyst loaded with copper nanoparticles has excellent photocatalytic performance and cycle stability. After 15 minutes of irradiation, the degradation rate of HEDP is up to 53%, the degradation rate of HEDP can reach 96% after two hours of reaction, and the HEDP removal rate is still above 95% after 5 cycles. Meanwhile, the bismuth vanadate photocatalyst loaded with copper nanoparticles has the ability to selectively oxidize HEDP in the presence of coexisting competitive substrates.

Description

Technical Field

[0001] This invention belongs to the field of water treatment and relates to a photochemical method for the highly selective removal of organophosphorus pollutants in water, specifically a photochemical method for the selective oxidation removal of organophosphorus pollutants in wastewater. Background Technology

[0002] Phosphates are widely used in industries such as water treatment, oil extraction, textiles, and electroplating. The environmental problems caused by their extensive use have attracted widespread attention. Compared with inorganic phosphates, the removal of phosphates from water bodies faces greater challenges. Currently, the main methods for removing phosphates are flocculation sedimentation, adsorption, and oxidative degradation. Phosphates have a complex structure, making it difficult to effectively separate them from water bodies through physical methods such as adsorption. This also affects the separation efficiency of total phosphorus in wastewater. Therefore, converting phosphates into inorganic phosphorus (orthophosphate) is of great significance. Currently, the oxidative removal of phosphates is mainly achieved through two methods: (1) directly oxidizing phosphates to orthophosphate through active oxygen species; (2) utilizing the coordination between phosphates and metal ions, oxidizing phosphates to orthophosphate through ligand-to-electron transfer under the action of an external oxidant. For example, Huang et al. (Separation and Purification Technology. 2022, 297, 121385) achieved the oxidation of phosphonates HEDP (hydroxyethylidene diphosphonic acid) using ozone oxidation, which has a high redox potential. Rott et al. (Water Research. 2017, 122, 345-354) generated highly oxidizing hydroxyl radicals using Fenton and UV / Fenton methods, achieving the oxidation of various phosphonates such as PBTC (2-phospho-1,2,4-tricarboxylate butane) and HEDP. However, the highly oxidizing reactive oxygen species generated by these advanced oxidation processes are easily interfered with by natural organic matter and common anions in the water, thus affecting the removal efficiency of phosphonates. Utilizing the ligand-to-metal electron transfer mechanism is a more feasible approach to achieve selective oxidation of phosphonates. For example, Zhu et al. (Water Research. 2021, 202, 117397) oxidized HEDP using the Co(II)-PMS process. They utilized the coordination of HEDP with Co(II)-PMS complexes to oxidize HEDP via single-electron transfer or oxygen atom transfer mechanisms. Sun et al. (Environ. Sci. Technol. 2022, 56, 634-641) achieved selective oxidation of HEDP through intramolecular electron transfer via a Cu(II)-H2O2 process under alkaline conditions, utilizing the coordination of phosphonates with copper. However, these methods for oxidizing HEDP still have the following drawbacks: on the one hand, the addition of oxidants increases economic costs; on the other hand, the use of metal ions and oxidants also poses a risk of secondary pollution. Therefore, developing a method for highly selective removal of organophosphorus pollutants from water without the need for external oxidants has significant application potential. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides an application of bismuth vanadate loaded with copper nanoparticles in the photocatalytic oxidation of organophosphorus pollutants.

[0004] According to an embodiment of the present invention, the bismuth vanadate loaded with copper nanoparticles comprises a bismuth vanadate support and copper nanoparticles loaded on the support. Preferably, the bismuth vanadate support has a nanosheet structure; the average particle size of the copper nanoparticles is 1–10 nm, exemplarily 4.6 nm.

[0005] According to an embodiment of the present invention, the bismuth vanadate loaded with copper nanoparticles is prepared by photodeposition of bismuth vanadate and copper salt.

[0006] In one embodiment of the present invention, the reaction mass ratio of the copper salt and bismuth vanadate is (0.005-0.02):1, with exemplary ratios being 0.005:1, 0.01:1, 0.015:1, and 0.02:1.

[0007] In one embodiment of the invention, the photodeposition method is carried out in a solution system. For example, bismuth vanadate and a copper salt are dissolved in a solvent (such as water) to obtain a suspension.

[0008] In one embodiment of the present invention, the wavelength of the photodeposition method is preferably greater than 420 nm, for example, 420 nm to 1200 nm; an example is 460 nm; the light intensity of the photodeposition method is preferably 100 mW / cm². 2 ~1000mW / cm 2 An example is 400mW / cm 2 The photodeposition process takes 1 to 10 hours, with 5 hours being an example.

[0009] In one embodiment of the present invention, the bismuth vanadate is prepared by a hydrothermal reaction of a vanadium source and a bismuth source under weakly acidic conditions.

[0010] In one embodiment of the present invention, the molar ratio of the vanadium source to the bismuth source is 1:(0.5-2), with an example of 1:1.

[0011] In one embodiment of the present invention, the vanadium source is, for example, ammonium metavanadate.

[0012] In one embodiment of the invention, the bismuth source is, for example, bismuth pentahydrate nitrate.

[0013] In one embodiment of the present invention, the reaction between the vanadium source and the bismuth source is carried out in a solvent system. For example, the vanadium source and the bismuth source are dissolved in a nitric acid solution to obtain a mixture. Alternatively, the concentrations of the vanadium source and the bismuth source in the mixture may be the same or different, and can be independently 0.1–0.5 mol / L, with an example of 0.25 mol / L. Furthermore, the concentration of the nitric acid solution can be 1–5 mol / L, with an example of 4 mol / L.

[0014] In one embodiment of the present invention, the pH of the weakly acidic condition is 4 to 6, exemplarily 5. Alternatively, the weakly acidic condition can be achieved by adjusting the pH of the solution by adding a saturated sodium carbonate solution.

[0015] In one embodiment of the present invention, the temperature of the hydrothermal reaction is 160-200°C, exemplarily 180°C; and the time of the hydrothermal reaction is 1-4 hours, exemplarily 2 hours.

[0016] In one embodiment of the present invention, the method for preparing bismuth vanadate further includes a process of solid-liquid separation of the reaction system after the reaction is completed to obtain the reaction product. For example, the solid-liquid separation can be performed using methods known in the art, such as filtration.

[0017] In one embodiment of the present invention, the method for preparing bismuth vanadate further includes washing the reaction product obtained from solid-liquid separation. For example, the washing solvent can be water. Furthermore, the washing can be performed once, twice, or more times, preferably three times.

[0018] According to an embodiment of the present invention, the method for preparing bismuth vanadate further includes drying the washed reaction product. For example, the drying temperature is 40–80°C, exemplarily 40°C, 60°C, or 80°C.

[0019] In one embodiment of the invention, the copper salt is, for example, copper nitrate trihydrate.

[0020] In one embodiment of the present invention, the method for preparing bismuth vanadate loaded with copper nanoparticles further includes a process of solid-liquid separation of the reaction system after the reaction is completed to obtain the reaction product. For example, the solid-liquid separation can be performed using methods known in the art, such as filtration.

[0021] In one embodiment of the present invention, the method for preparing bismuth vanadate loaded with copper nanoparticles further includes washing the reaction product obtained from solid-liquid separation. For example, the washing solvent can be water. Furthermore, the washing can be performed once, twice, or more, preferably three times.

[0022] According to an embodiment of the present invention, the method for preparing bismuth vanadate loaded with copper nanoparticles further includes drying the washed reaction product. For example, the drying temperature is 40–80°C, exemplarily 40°C, 60°C, or 80°C.

[0023] The present invention also provides a method for removing organophosphorus pollutants, comprising mixing the above-mentioned bismuth vanadate loaded with copper nanoparticles with organophosphorus pollutants, and realizing the conversion of organophosphorus pollutants to orthophosphate through photocatalytic reaction.

[0024] According to an embodiment of the present invention, the mixing mass ratio of the copper-loaded bismuth vanadate to the organophosphorus pollutant is (1-100):1, with exemplary ratios of 1:1, 5:1, 10:1, 24:1, 48:1, 60:1, 80:1, and 100:1.

[0025] According to embodiments of the present invention, the organophosphorus pollutant may be at least one of phosphonates (such as hydroxyethylidene diphosphonate HEDP), PBTC (2-phospho-1,2,4-tricarboxylate butane), etc.

[0026] According to an embodiment of the present invention, the wavelength range of the photocatalytic reaction is 190 nm to 1200 nm, preferably 300 nm to 1200 nm; the light intensity range of the photocatalytic reaction is 100 mW / cm². 2 ~1000mW / cm 2 An example is 100mW / cm 2 The temperature of the photocatalytic reaction is 20-60°C, with an example of 30°C; the time of the photocatalytic reaction is 1-10 hours, with an example of 2 hours.

[0027] According to an embodiment of the present invention, the method for removing organophosphorus pollutants includes the following steps:

[0028] (1) Preparation of bismuth vanadate by hydrothermal method: The precursor ammonium metavanadate and bismuth nitrate pentahydrate were dissolved in nitric acid solution, mixed and stirred, and then saturated sodium carbonate solution was added. The pH of the solution was adjusted to weakly acidic conditions, and after hydrothermal treatment, the solution was filtered and washed to obtain bismuth vanadate.

[0029] (2) Preparation of bismuth vanadate loaded with copper nanoparticles by photodeposition: Bismuth vanadate and copper salt were dissolved in water, and then photodeposition reaction was carried out. After filtration, washing and drying, bismuth vanadate loaded with copper nanoparticles was obtained.

[0030] (3) Bismuth vanadate loaded with copper nanoparticles is photodispersed in an organic phosphorus pollutant solution to carry out a photocatalytic reaction and realize the conversion of organic phosphorus pollutants to orthophosphate.

[0031] In this invention, the photocatalytic reaction refers to a reaction under certain light irradiation for a period of time, followed by collection of the reaction solution, addition of a colorimetric reagent, and analysis using a UV-Vis spectrophotometer.

[0032] The beneficial effects of this invention are:

[0033] (1) The synthesis and reaction process of bismuth vanadate loaded with copper nanoparticles in this invention is simple. Using it as a catalyst to catalyze the oxidation of HEDP, it has good stability, does not require the addition of external oxidant, is low in cost, and has high practical application value, thus providing a new strategy for the highly selective oxidation and removal of organic phosphorus pollutants in water.

[0034] (2) No external peroxide is required during the photocatalytic reaction of the present invention. The conversion rate of orthophosphate can reach nearly 100% in 2 hours under simulated sunlight.

[0035] (3) In the reaction involving coexisting pollutants, common anions such as chloride, sulfate, nitrate, and bicarbonate have minimal impact on the oxidative removal of organophosphorus pollutants (such as HEDP). In the reaction involving sodium humate, the phosphate formation rate remains above 70%. Furthermore, the effects of natural small-molecule organic acids such as oxalic acid, citric acid, tartaric acid, and salicylic acid on HEDP conversion are negligible.

[0036] (4) The bismuth vanadate photocatalyst supported on copper nanoparticles of the present invention has good stability, and the crystal structure of the catalyst does not change significantly before and after the reaction. Moreover, the reaction conversion rate of the catalyst is above 95% in five cycles of stability test, and the concentration of metal ions dissolved in the solution after the reaction is below 0.01 ppm. Attached Figure Description

[0037] Figure 1 The X-ray diffraction patterns are those of the bismuth vanadate photocatalyst prepared in Example 1 (labeled as BVO) and the bismuth vanadate photocatalyst loaded with copper nanoparticles prepared in Example 2 (labeled as Cu-BVO).

[0038] Figure 2 The images show scanning electron microscope (SEM) and transmission electron microscope (TEM) images of the bismuth vanadate photocatalyst substrate (labeled BVO) prepared in Example 1 and the bismuth vanadate photocatalyst loaded with copper nanoparticles (labeled Cu-BVO) prepared in Example 2.

[0039] Figure 3 The image shows the X-ray photoelectron spectrum of the bismuth vanadate photocatalyst (labeled Cu-BVO) loaded with copper nanoparticles prepared in Example 2.

[0040] Figure 4The image shows the photocatalytic performance of the bismuth vanadate photocatalyst loaded with copper nanoparticles prepared in Example 2.

[0041] Figure 5 The effect of bismuth vanadate loaded with copper nanoparticles prepared in Example 2 on the photocatalytic performance of the catalyst under conditions of presence or absence of coexisting contaminants.

[0042] Figure 6 The cycling stability and ion leaching of the bismuth vanadate photocatalyst loaded with copper nanoparticles prepared in Example 2 are shown.

[0043] Figure 7 The images show the XRD patterns of bismuth vanadate loaded with copper nanoparticles prepared in Example 2 before (labeled as Cu-BVO) and after (labeled as Used Cu-BVO) photocatalytic reaction. Detailed Implementation

[0044] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. It should be understood that the following embodiments are merely illustrative and explanatory of the present invention, and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are covered within the scope of protection intended by the present invention.

[0045] Unless otherwise stated, the raw materials and reagents used in the following examples are commercially available products or can be prepared by known methods.

[0046] Example 1

[0047] The preparation method of bismuth vanadate photocatalyst includes the following steps:

[0048] (1) Weigh 0.585g of ammonium metavanadate and 2.425g of bismuth nitrate pentahydrate, place them in 20mL of 4mol / L nitric acid solution, and stir at room temperature for 0.5h to obtain a pale yellow and clear mixed nitric acid solution of ammonium metavanadate and bismuth nitrate.

[0049] (2) Add 25 mL of saturated sodium carbonate solution to the obtained mixed nitric acid solution to adjust the pH value of the solution to 5.0, forming a yellow slurry, and stir at room temperature for 0.5 h.

[0050] (3) The obtained yellow slurry was transferred to a 20 mL stainless steel autoclave with a Teflon lining and subjected to hydrothermal treatment at 180 °C for 2 h. After the autoclave cooled to room temperature, the suspension was filtered, washed three times with deionized water, and then vacuum dried at 60 °C to obtain a yellow bismuth vanadate photocatalyst.

[0051] Example 2

[0052] The preparation method of bismuth vanadate photocatalyst supported on copper nanoparticles includes the following steps:

[0053] (1) Weigh 19 mg of copper nitrate trihydrate and 0.5 g of bismuth vanadate synthesized in Example 1, place them in 100 mL of deionized water, stir evenly, and then put the mixed suspension into a quartz photoreactor.

[0054] (2) The quartz photoreactor was placed under a 300W xenon lamp (wavelength range 420nm-1200nm, light intensity 400mW / cm²) with continuous stirring. 2 After irradiation for 5 hours, the suspension was filtered, washed three times with deionized water, and then vacuum dried at 60°C to obtain a bismuth vanadate photocatalyst loaded with copper nanoparticles.

[0055] Figure 1 The X-ray diffraction patterns are shown for the bismuth vanadate photocatalyst prepared in Example 1 and the bismuth vanadate photocatalyst loaded with copper nanoparticles prepared in Example 2. As can be seen from the figures, the product obtained in this invention exhibits high crystallinity, and the diffraction peaks conform to the standard card for monoclinic scheelite bismuth vanadate (JCPDS14-0688), thus proving the successful preparation of the bismuth vanadate photocatalyst loaded with copper nanoparticles. Furthermore, the crystal structure of the bismuth vanadate photocatalyst remains unchanged after loading with copper nanoparticles.

[0056] Figure 2 The images show scanning electron microscope (SEM) and transmission electron microscope (TEM) images of the bismuth vanadate photocatalyst prepared in Example 1 and the bismuth vanadate photocatalyst loaded with copper nanoparticles prepared in Example 2. As can be seen from the images, both the bismuth vanadate photocatalyst and the bismuth vanadate photocatalyst loaded with copper nanoparticles exhibit a nanosheet structure, with copper nanoparticles loaded on the bismuth vanadate nanosheets. The average particle size of the copper nanoparticles is approximately 4.6 nm.

[0057] Figure 3 The image shows the X-ray photoelectron spectrum of the bismuth vanadate photocatalyst loaded with copper nanoparticles prepared in Example 2. As can be seen from the image, copper mainly exists in the 0-valent copper (metallic state), which proves the successful loading of copper nanoparticles.

[0058] Example 3

[0059] The photocatalytic performance test was conducted in a quartz container with a water circulation jacket, and the reaction temperature was maintained at 30℃. The reaction light source was a 300W xenon lamp equipped with an AM 1.5G filter, and the light intensity was measured to be 100mW cm⁻¹ using a photometer. -2 At given time intervals, 1 mL of the reaction solution (comprising 20 mL of 0.1 mM HEDP aqueous solution and 20 mg of the copper nanoparticle-loaded bismuth vanadate photocatalyst prepared in Example 2) was filtered through a 0.22 μm filter membrane, and the active species in the reaction were quenched with 50 μL of Na2SO3 (0.5 M) before analysis.

[0060] The formation of orthophosphate during the reaction was detected using ammonium molybdate spectrophotometry. In the test solution (comprising unreacted HEDP substrate and the phosphate product generated after the reaction; the concentrations of each component varied with the time elapsed after the reaction solution was removed), 100 μL of ascorbic acid (100 g / L) and 200 μL of ammonium molybdate solution (26.0 g / L ammonium molybdate tetrahydrate, 0.7 g / L potassium antimony tartrate, and 5.0 M sulfuric acid) were added. After 15 minutes of color development, the absorbance was measured at 710 nm using a UV / Vis spectrophotometer. Finally, the concentration of orthophosphate was calculated using a standard curve method.

[0061] from Figure 4 It can be seen that the degradation rate of HEDP can reach over 96%. Notably, after 15 minutes of light irradiation, the degradation rate of HEDP reached as high as 53%, indicating that the bismuth vanadate photocatalyst with copper nanoparticles loaded in Example 2 can rapidly degrade HEDP.

[0062] Example 4

[0063] Photocatalytic selective oxidation test: The test system and method were the same as in Example 3, except that different coexisting substrates were added to the reaction solution (catalyst concentration of 1 g / L, HEDP solution concentration of 0.1 mM). The coexisting substrates were common anions, such as chloride ions (Cl...). - ), sulfate ions (SO4) 2- ), nitrate ions (NO3) - ) and bicarbonate ions (HCO3) - The concentrations of various organic compounds were 10 mM, including common organic compounds such as sodium humate (NOM) at 10 mg / L, and small molecule organic acids such as oxalic acid, citric acid, tartaric acid, salicylic acid, and ethylenediaminetetraacetic acid (EDTA) at 10 mM. The device was placed under simulated sunlight to initiate the photocatalytic reaction. At given time intervals, 1 mL of the reaction solution was filtered through a 0.22 μm filter membrane, and the active species in the reaction were quenched with 50 μL of Na₂SO₃ (0.5 M) before analysis. The formation of orthophosphate ions in the reaction was detected using ammonium molybdate spectrophotometry, and the results are as follows: Figure 5 As shown.

[0064] from Figure 5 It can be seen that after adding coexisting substrates to HEDP aqueous solution, common anions such as chloride ions (Cl) are present. - ), sulfate ions (SO4) 2- ), nitrate ions (NO3) - ) and bicarbonate ions (HCO3)- The effects of sodium humate (NOM) on the oxidative removal of HEDP are minimal. In reactions where NOM coexists, the phosphate formation rate remains above 70%. Furthermore, the effects of small-molecule organic acids such as oxalate, citric acid, tartaric acid, and salicylate on HEDP conversion are negligible, while ethylenediaminetetraacetic acid (EDTA) has a certain influence on the catalytic oxidation of HEDP.

[0065] Example 5

[0066] Catalyst cycle stability test: The test system and test method are the same as in Example 3. The difference is that after each reaction, the catalyst is centrifuged at 8000 rpm for 10 min to collect the used photocatalyst, washed with deionized water, and then added to a new reaction solution for the next reaction.

[0067] Figure 6 The graph shows the cyclic stability test results of the bismuth vanadate photocatalyst supported on copper nanoparticles prepared in Example 2. As can be seen from the graph, after five cycles, the degradation rate of HEDP only slightly decreased from 98% to 95%, indicating that the bismuth vanadate catalyst supported on copper nanoparticles of this invention has high stability. Furthermore, after each cycle, the copper ion concentration in the solution remained at a low level of 0.01 ppm, indicating that the copper nanoparticles are tightly bound to the bismuth vanadate substrate, resulting in good catalyst stability.

[0068] Figure 7 The XRD patterns of bismuth vanadate Cu-BVO loaded with copper nanoparticles prepared in Example 2 before (Cu-BVO loaded with copper nanoparticles prepared in Example 2) and after (Used Cu-BVO) photocatalytic reaction are shown. The results in the figures indicate that the crystal structure of the catalyst did not change before and after the reaction. This further verifies that the bismuth vanadate catalyst loaded with copper nanoparticles of the present invention has excellent durability and stability.

[0069] The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. Application of bismuth vanadate loaded with copper nanoparticles in the photocatalytic oxidation of organophosphonate pollutants.

2. The application as described in claim 1, characterized in that, The bismuth vanadate loaded with copper nanoparticles includes a bismuth vanadate support and copper nanoparticles loaded on the support.

3. The application as described in claim 2, characterized in that, The bismuth vanadate support has a nanosheet structure; the average particle size of the copper nanoparticles is 1~10 nm.

4. The application as described in any one of claims 1-3, characterized in that, The bismuth vanadate loaded with copper nanoparticles was prepared by photodeposition of bismuth vanadate and copper salt.

5. The application as described in claim 4, characterized in that, The reaction mass ratio of the copper salt and bismuth vanadate is (0.005~0.02):

1.

6. The application as described in claim 4, characterized in that, The photodeposition method is carried out in a solution system, in which bismuth vanadate and copper salt are dissolved in a solvent to obtain a suspension.

7. The application as described in claim 4, characterized in that, The wavelength of the photodeposition method is 420 nm to 1200 nm; the light intensity of the photodeposition method is 100 mW / cm². 2 ~1000 mW / cm 2 The photodeposition process takes 1 to 10 hours.

8. The application as described in claim 4, characterized in that, The bismuth vanadate is prepared by a hydrothermal reaction of a vanadium source and a bismuth source under weakly acidic conditions.

9. The application as described in claim 8, characterized in that, The molar ratio of the vanadium source to the bismuth source is 1:(0.5~2). The vanadium source is ammonium metavanadate; The bismuth source is bismuth pentahydrate nitrate.

10. The application as described in claim 8, characterized in that, The reaction between the vanadium source and the bismuth source is carried out in a solvent system, wherein the vanadium source and the bismuth source are dissolved in nitric acid solution to obtain a mixed solution; In the mixture, the concentrations of the vanadium source and the bismuth source may be the same or different, and are independently 0.1~0.5 mol / L; The concentration of the nitric acid solution is 1~5 mol / L; The pH of the weakly acidic conditions is 4-6; The hydrothermal reaction temperature is 160~200℃; the hydrothermal reaction time is 1~4h.

11. A method for removing organophosphonate contaminants, characterized in that, This includes mixing bismuth vanadate loaded with copper nanoparticles as described in any one of claims 1-10 with organophosphonate pollutants, and achieving the conversion of organophosphonate pollutants to orthophosphate through a photocatalytic reaction.

12. The method as described in claim 11, characterized in that, The mass ratio of the copper-loaded bismuth vanadate to the organophosphonate contaminant is (1~100):

1.

13. The method as described in claim 11, characterized in that, The organophosphonate is at least one of hydroxyethylidene diphosphonate (HEDP) and 2-phospho-1,2,4-tricarboxylic acid butane.

14. The method as described in claim 11, characterized in that, The wavelength range of the photocatalytic reaction is 190 nm to 1200 nm; the light intensity range of the photocatalytic reaction is 100 mW / cm². 2 ~1000 mW / cm 2 The temperature of the photocatalytic reaction is 20~60℃; the time of the photocatalytic reaction is 1~10h.

15. The method according to any one of claims 11-14, characterized in that, Includes the following steps: (1) Preparation of bismuth vanadate by hydrothermal method: The precursor ammonium metavanadate and bismuth nitrate pentahydrate were dissolved in nitric acid solution, mixed and stirred, and then saturated sodium carbonate solution was added. The pH of the solution was adjusted to weakly acidic conditions, and after hydrothermal treatment, the solution was filtered and washed to obtain bismuth vanadate. (2) Preparation of bismuth vanadate loaded with copper nanoparticles by photodeposition: Bismuth vanadate and copper salt were dissolved in water, and then photodeposition reaction was carried out. After filtration, washing and drying, bismuth vanadate loaded with copper nanoparticles was obtained. (3) Bismuth vanadate loaded with copper nanoparticles is photodispersed in an organic phosphonate pollutant solution to carry out a photocatalytic reaction and realize the conversion of organic phosphonate pollutants to orthophosphate.

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