Bi2O2CO3 photocatalyst as well as preparation method and application thereof

Abstract

The invention provides a Bi2O2CO3 photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalysis. According to the invention, deionized water is used as a reaction solvent, and ethanol is used as a reducing agent to promote conversion of BiOCOOH into Bi2O2CO3; the mercury lamp is used for providing ultraviolet rays, the power of the mercury lamp is specifically limited, escape of oxygen atoms in the [Bi2O2] < 2 + > layer can be effectively promoted through strong ultraviolet radiation, and BiOCOOH is converted into Bi2O2CO3. The result of the embodiment shows that the BiOCOOH phase can be completely converted into Bi2O2CO3 within 30 minutes by adopting the method provided by the invention, and the synthesis method has the characteristics of rapidness, low cost and capability of preparing Bi2O2CO3 on a large scale.

Description

Technical Field

[0001] The present invention relates to the field of photocatalysis technology, and in particular to a Bi2O2CO3 photocatalyst and a preparation method and application thereof. Background Art

[0002] Photocatalytic technology can convert solar energy into chemical energy to reduce CO2 to high-value-added chemical fuels. On the one hand, it solves the current energy shortage problem, and on the other hand, it alleviates the greenhouse effect caused by CO2 emissions. In recent years, layered bismuth-based materials, such as BiOCOOH, have attracted the attention of researchers due to their unique layered crystal structure, diverse composition, rich atomic coordination, and unique mixed electronic band structure. However, BiOCOOH has a large bandgap and can only respond effectively under ultraviolet light, which reduces the utilization rate of sunlight and limits its application.

[0003] Bi2O2CO3 is a new type of semiconductor photocatalyst. Compared with the narrow bandgap of BiOCOOH, Bi2O2CO3 has excellent performance in structure, electronics and optics due to its unique layered structure, strong covalent bonds between atomic layers and the synergistic effect of van der Waals forces, and has a wider bandgap. However, the common preparation method of Bi2O2CO3 is hydrothermal method. For example, Chinese patent CN 202210886926.X discloses a preparation method of tubular Bi2O2CO3 by KI hydrothermal treatment, in which a mixed solution of bismuth nitrate pentahydrate, hexamethylenetetramine and is placed in a polytetrafluoroethylene liner, and subjected to constant temperature hydrothermal reaction at 180°C for 24 hours to obtain Bi2O2CO3; for another example, Chinese patent CN 202210494664.2 discloses a simple preparation method of Bi2O2CO3 photocatalyst by NaCl hydrothermal treatment, and the above hydrothermal method is also used to prepare Bi2O2CO3. Although the hydrothermal method can obtain Bi2O2CO3, this method has problems such as high reaction temperature, harsh conditions, and inability to prepare Bi2O2CO3 on a large scale.

[0004] Therefore, there is an urgent need to provide a method for rapid, low-cost, and large-scale preparation of Bi2O2CO3. Summary of the invention

[0005] The object of the present invention is to provide a Bi2O2CO3 photocatalyst and a preparation method and application thereof. The preparation method provided by the present invention can prepare the Bi2O2CO3 photocatalyst quickly, at low cost and on a large scale.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides a method for preparing a Bi2O2CO3 photocatalyst, comprising the following steps:

[0008] (1) mixing BiOCOOH, deionized water and ethanol to obtain a BiOCOOH mixed solution;

[0009] (2) irradiating the BiOCOOH mixed solution obtained in step (1) under a mercury lamp to obtain a Bi2O2CO3 photocatalyst; the power of the mercury lamp is 900-1000W; and the irradiation time is 30-33 minutes.

[0010] Preferably, the method for preparing BiOCOOH in step (1) comprises: subjecting a bismuth salt solution to a solvothermal reaction to obtain BiOCOOH.

[0011] Preferably, the concentration of the bismuth salt solution is 0.015-0.02 mmol / mL.

[0012] Preferably, the temperature of the solvothermal reaction is 115-125° C., and the time of the solvothermal reaction is 11-13 h.

[0013] Preferably, in step (1), the volume ratio of deionized water to ethanol is (28-32):(13-17).

[0014] Preferably, in step (1), the ratio of the mass of BiOCOOH to the total volume of deionized water and ethanol is (50-53) mg: (43-47) mL.

[0015] Preferably, the power of the mercury lamp in step (2) is 1000W.

[0016] Preferably, the irradiation time in step (2) is 30 minutes.

[0017] The present invention also provides a Bi2O2CO3 photocatalyst prepared by the preparation method described in the above technical solution.

[0018] The present invention also provides the use of the Bi2O2CO3 photocatalyst described in the above technical solution in the degradation of Rhodamine B.

[0019] The present invention provides a method for preparing a Bi2O2CO3 photocatalyst, comprising the following steps: mixing BiOCOOH, deionized water and ethanol to obtain a BiOCOOH mixed solution; irradiating the BiOCOOH mixed solution under a mercury lamp to obtain a Bi2O2CO3 photocatalyst; the power of the mercury lamp is 900-1000W; and the irradiation time is 30-33min. The present invention uses deionized water as a reaction solvent and ethanol as a reducing agent to promote the conversion of BiOCOOH into Bi2O2CO3; the present invention uses a mercury lamp to provide ultraviolet rays, and specifically limits the power of the mercury lamp. Strong ultraviolet radiation can effectively promote [Bi2O2]2+ The escape of oxygen atoms in the layer causes the BiOCOOH phase to transform into Bi2O2CO3. The results of the embodiment show that the method provided by the present invention can completely transform the BiOCOOH phase into Bi2O2CO3 in 30 minutes. The synthesis method has the characteristics of rapidity, low cost and large-scale preparation of Bi2O2CO3. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 XRD patterns of BiOCOOH and Bi2O2CO3 photocatalysts prepared in Example 1 of the present invention, photocatalysts prepared in Comparative Examples 1 and 2, and BiOCOOH and Bi2O2CO3 standard cards;

[0021] Figure 2 SEM images of BiOCOOH and Bi2O2CO3 photocatalysts prepared in Example 1 of the present invention and photocatalysts prepared in Comparative Examples 1 and 2;

[0022] Figure 3 XRD diagrams of the samples prepared in Comparative Examples 3 and 4 of the present invention and BiOCOOH and Bi2O2CO3 standard cards;

[0023] Figure 4 This is a comparison chart of the degradation effects of Rhodamine B by different samples of the present invention. DETAILED DESCRIPTION

[0024] The present invention provides a Bi2O2CO3 photocatalyst and a preparation method thereof, comprising the following steps:

[0025] (1) mixing BiOCOOH, deionized water and ethanol to obtain a BiOCOOH mixed solution;

[0026] (2) irradiating the BiOCOOH mixed solution obtained in step (1) under a mercury lamp to obtain a Bi2O2CO3 photocatalyst; the power of the mercury lamp is 900-1000W; and the irradiation time is 30-33 minutes.

[0027] The present invention mixes BiOCOOH, deionized water and ethanol to obtain a BiOCOOH mixed solution.

[0028] In the present invention, the method for preparing BiOCOOH preferably comprises: subjecting a bismuth salt solution to a solvothermal reaction to obtain BiOCOOH.

[0029] In the present invention, the solute of the bismuth salt solution is preferably bismuth nitrate pentahydrate; the solvent of the bismuth salt solution is preferably N,N-dimethylformamide DMF and deionized water, and the volume ratio of DMF and deionized water is preferably (7.3-7.7): (58-62), and more preferably 7.5:60. The use of the above-mentioned bismuth nitrate solution in the present invention is more conducive to obtaining BiOCOOH with less impurities. The present invention has no special limitation on the preparation method of the bismuth nitrate solution, and bismuth nitrate pentahydrate can be fully dissolved and dispersed in DMF and water. In one embodiment of the present invention, the preparation method of the bismuth salt solution is preferably: after stirring and mixing bismuth nitrate pentahydrate and DMF evenly, deionized water is added, and then ultrasonicated for 10 minutes to obtain a bismuth salt solution.

[0030] In the present invention, the concentration of the bismuth nitrate solution is preferably 0.015 to 0.02 mmol / mL, more preferably 0.02 mmol / mL. The present invention uses a bismuth nitrate solution with the above concentration, which is more conducive to a more complete solvothermal reaction.

[0031] In the present invention, the temperature of the solvent thermal reaction is preferably 115-125°C, more preferably 120°C; the time of the solvent thermal reaction is preferably 11-13h, more preferably 12h. The present invention performs the reaction at the above temperature and time, so that the bismuth salt can be fully converted into BiOCOOH. The present invention has no special limitation on the device of the solvent thermal reaction, and a conventional solvent thermal reaction device can be used.

[0032] In the present invention, after the solvent thermal reaction, the solid product of the solvent thermal reaction is preferably washed and dried in sequence to obtain BiOCOOH. The present invention has no special limitation on the operation method of the washing and drying, and conventional washing and drying methods are used to remove impurities and solvents in the solid product. In the present invention, the washing reagents are preferably ethanol and water. In the present invention, the drying temperature is preferably 55 to 65°C, more preferably 60°C; the drying time is preferably 11 to 13h, more preferably 12h.

[0033] In the present invention, the volume ratio of deionized water to ethanol is preferably (28-32): (13-17), more preferably 2: 1. The present invention controls the volume ratio of deionized water to ethanol within the above range, and the formed system is more conducive to improving the reaction rate.

[0034] In the present invention, the ratio of the mass of BiOCOOH to the total volume of deionized water and ethanol is preferably (50-53) mg: (43-47) mL, more preferably 0.005 g: 45 mL. The present invention controls the ratio of the mass of BiOCOOH to the total volume of deionized water and ethanol within the above range, and the formed system is more conducive to promoting the full conversion of BiOCOOH into Bi2O2CO3.

[0035] The present invention has no particular limitation on the method for mixing the BiOCOOH, deionized water and ethanol, and a conventional mixing method can be used to uniformly mix the above components. In the present invention, the mixing method is preferably mechanical stirring.

[0036] After obtaining the BiOCOOH mixed solution, the present invention irradiates the BiOCOOH mixed solution under a mercury lamp to obtain a Bi2O2CO3 photocatalyst.

[0037] In the present invention, the power of the mercury lamp is 900-1000W, preferably 1000W; the irradiation time is 30-33min, preferably 30min. The present invention controls the power and time of the mercury lamp within the above range, which can provide strong ultraviolet radiation and effectively promote [Bi2O2] 2+ The escape of oxygen atoms in the layer causes the BiOCOOH phase to transform into Bi2O2CO3.

[0038] In the present invention, the temperature of the BiOCOOH mixed solution when irradiated under a mercury lamp is preferably 33-35° C., more preferably 35° C. The present invention controls the temperature within the above range, which is more conducive to promoting the phase transformation of BiOCOOH into Bi2O2CO3.

[0039] In the present invention, the BiOCOOH mixed solution is preferably irradiated under a mercury lamp while being stirred. The present invention can promote a more complete reaction by stirring, so that BiOCOOH is fully converted into Bi2O2CO3. The present invention has no particular limitation on the speed of stirring, as long as it can promote uniform mixing of the components and prevent the liquid component from overflowing.

[0040] In the present invention, the container containing the BiOCOOH mixed solution is preferably sealed with a sealing film during the stirring. The present invention can isolate air by sealing with a sealing film, prevent liquid from splashing, and avoid unnecessary errors.

[0041] In the present invention, after the mercury lamp irradiation, the solid product after the mercury lamp irradiation is preferably washed and dried in sequence to obtain Bi2O2CO3. In the present invention, the washing reagents are preferably ethanol and water. In the present invention, the drying temperature is preferably 40 to 60°C, more preferably 40°C; the drying time is preferably 11 to 13 hours, more preferably 12 hours.

[0042] The preparation method provided by the present invention is simple to operate, and only requires mercury lamp irradiation and control of the power and time of the mercury lamp to synthesize Bi2O2CO3 quickly and on a large scale, thereby greatly shortening the synthesis time.

[0043] The present invention also provides a Bi2O2CO3 photocatalyst prepared by the preparation method described in the above technical solution.

[0044] In the present invention, the Bi2O2CO3 photocatalyst is preferably a tetragonal layered structure. The Bi2O2CO3 photocatalyst provided by the present invention has a large internal electric field and an asymmetric polarization effect. Its structure consists of a Bi-O layer and a CO3 2- Layer composition. [Bi2O2] 2+ Layers and CO3 2- The planes of the groups are orthogonal, and the staggered electric field is formed. 3+ It coordinates with 8 oxygen atoms to form Bi-O bonds.

[0045] The present invention also provides the use of the Bi2O2CO3 photocatalyst described in the above technical solution in the degradation of Rhodamine B.

[0046] The present invention has no special limitation on the application method of the Bi2O2CO3 photocatalyst in the degradation of Rhodamine B, and any conventional catalyst application method may be used.

[0047] In the present invention, since the internal electric field of the Bi2O2CO3 photocatalyst is large and has an asymmetric polarization effect, its structure consists of a Bi-O layer and a CO3 2- Layer composition, [Bi2O2] 2+ Layers and CO3 2- The planes of the groups are orthogonal, and the staggered electric field is formed. 3+ It is coordinated with 8 oxygen atoms to form a Bi-O bond, so it has excellent photocatalytic activity and can be used to degrade rhodamine B in visible light.

[0048] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] Example 1

[0050] A Bi2O2CO3 photocatalyst and a preparation method thereof, comprising the following steps:

[0051] (1) 50 mg BiOCOOH, 30 mL deionized water and 15 mL ethanol were stirred on a magnetic stirrer. During the stirring process, the test tube was sealed with a sealing film. After sufficient stirring, a BiOCOOH mixed solution was obtained. The volume ratio of deionized water to ethanol was 30:15. The mass ratio of BiOCOOH to the total volume of deionized water and ethanol was 50 mg:45 mL.

[0052] Among them, the preparation method of BiOCOOH is as follows: put 1.5mmol Bi2(NO3)3·5H2O into a 100mL beaker, accurately measure 7.5mL of DMF liquid with a pipette and add it thereto, stir it on a magnetic stirrer at room temperature to obtain a suspension, then add 60mL of deionized water to the above suspension and use an ultrasonic machine to ultrasonicate for 10min to obtain a bismuth nitrate solution with a concentration of 0.02mmol / mL. Subsequently, the bismuth nitrate solution is transferred to a 100mL polytetrafluoroethylene-lined high-temperature and high-pressure reactor and reacted at 120°C in a forced air drying oven for 12h. After the reaction is completed, it is naturally cooled to room temperature, the obtained precipitate is washed with water and alcohol three times each, and placed in a vacuum drying oven at 60°C for 12h. The obtained white powder is BiOCOOH, denoted as B.

[0053] (2) The BiOCOOH mixed solution obtained in step (1) was irradiated at a constant temperature of 35° C. under a 1000 W mercury lamp for 30 min, and then the lower layer of precipitate was washed with water and alcohol three times each, and placed in a vacuum drying oven at 40° C. for 12 h to obtain a Bi2O2CO3 photocatalyst, which was recorded as B-30.

[0054] Example 2

[0055] A Bi2O2CO3 photocatalyst and a preparation method thereof, comprising the following steps:

[0056] (1) 50 mg of BiOCOOH prepared in Example 1, 31 mL of deionized water and 16 mL of ethanol were stirred on a magnetic stirrer. During the stirring process, the test tube was sealed with a sealing film. After sufficient stirring, a BiOCOOH mixed solution was obtained;

[0057] (2) The BiOCOOH mixed solution obtained in step (1) was irradiated at a constant temperature of 35° C. under a mercury lamp with a power of 1000 W for 30 min, and then the lower layer of precipitate was washed with water and alcohol three times each, and placed in a vacuum drying oven at 40° C. for 12 h to obtain a Bi2O2CO3 photocatalyst.

[0058] Example 3

[0059] A Bi2O2CO3 photocatalyst and a preparation method thereof, comprising the following steps:

[0060] (1) 50 mg of BiOCOOH prepared in Example 1, 30 mL of deionized water and 15 mL of ethanol were stirred on a magnetic stirrer. During the stirring process, the test tube was sealed with a sealing film. After sufficient stirring, a BiOCOOH mixed solution was obtained;

[0061] (2) The BiOCOOH mixed solution obtained in step (1) is irradiated at a constant temperature of 35° C. under a 900 W mercury lamp for 30 min, and then the lower layer of precipitate is washed with water and alcohol three times each, and placed in a vacuum drying oven at 40° C. for 12 h to obtain a Bi2O2CO3 photocatalyst.

[0062] Comparative Example 1

[0063] A photocatalyst and a preparation method thereof, comprising the steps of:

[0064] (1) 50 mg of BiOCOOH prepared in Example 1, 30 mL of deionized water and 15 mL of ethanol were stirred on a magnetic stirrer. During the stirring process, the test tube was sealed with a sealing film. After sufficient stirring, a BiOCOOH mixed solution was obtained;

[0065] (2) The BiOCOOH mixed solution obtained in step (1) was irradiated at a constant temperature of 35° C. under a mercury lamp with a power of 1000 W for 10 min, and then the lower layer of precipitate was washed with water and alcohol three times each, and placed in a vacuum drying oven at 40° C. for 12 h to obtain a photocatalyst, which was recorded as B-10.

[0066] Comparative Example 2

[0067] A photocatalyst and a preparation method thereof, comprising the steps of:

[0068] (1) 50 mg of BiOCOOH prepared in Example 1, 30 mL of deionized water and 15 mL of ethanol were stirred on a magnetic stirrer. During the stirring process, the test tube was sealed with a sealing film. After sufficient stirring, a BiOCOOH mixed solution was obtained;

[0069] (2) The BiOCOOH mixed solution obtained in step (1) was irradiated at a constant temperature of 35° C. under a mercury lamp with a power of 1000 W for 20 min, and then the lower layer of precipitate was washed with water and alcohol three times each, and placed in a vacuum drying oven at 40° C. for 12 h to obtain a photocatalyst, which was recorded as B-20.

[0070] Comparative Example 3

[0071] A photocatalyst and a preparation method thereof, comprising the steps of:

[0072] (1) 50 mg of BiOCOOH prepared in Example 1 and 30 mL of deionized water were stirred on a magnetic stirrer. During the stirring process, the test tube was sealed with a sealing film. After sufficient stirring, a BiOCOOH mixed solution was obtained;

[0073] (2) The BiOCOOH mixed solution obtained in step (1) was irradiated at a constant temperature of 35° C. under a mercury lamp with a power of 1000 W for 30 minutes, and then the lower layer of precipitate was washed with water and alcohol three times each, and placed in a vacuum drying oven at 40° C. for 12 hours to obtain a photocatalyst.

[0074] Comparative Example 4

[0075] A photocatalyst and a preparation method thereof, comprising the steps of:

[0076] (1) 50 mg of BiOCOOH prepared in Example 1 and 15 mL of ethanol were stirred on a magnetic stirrer. During the stirring process, the test tube was sealed with a sealing film. After sufficient stirring, a BiOCOOH mixed solution was obtained;

[0077] (2) The BiOCOOH mixed solution obtained in step (1) was irradiated at a constant temperature of 35° C. under a mercury lamp with a power of 1000 W for 30 minutes, and then the lower layer of precipitate was washed with water and alcohol three times each, and placed in a vacuum drying oven at 40° C. for 12 hours to obtain a photocatalyst.

[0078] Comparative Example 5

[0079] A photocatalyst and a preparation method thereof, comprising the steps of:

[0080] (1) 50 mg of BiOCOOH prepared in Example 1, 15 mL of deionized water and 15 mL of ethanol were stirred on a magnetic stirrer. During the stirring process, the test tube was sealed with a sealing film. After sufficient stirring, a BiOCOOH mixed solution was obtained;

[0081] (2) The BiOCOOH mixed solution obtained in step (1) was irradiated at a constant temperature of 35° C. under a mercury lamp with a power of 1000 W for 30 minutes, and then the lower layer of precipitate was washed with water and alcohol three times each, and placed in a vacuum drying oven at 40° C. for 12 hours to obtain a photocatalyst.

[0082] Test Case

[0083] (1) The BiOCOOH and Bi2O2CO3 photocatalysts prepared in Example 1 and the photocatalysts prepared in Comparative Examples 1 and 2 were tested by XRD diffractometer, and the XRD patterns of the samples were compared with those of the BiOCOOH and Bi2O2CO3 standard cards PDF#41-1488. Figure 1 The BiOCOOH and Bi2O2CO3 photocatalysts prepared in Example 1 and the photocatalysts prepared in Comparative Examples 1 and 2 were tested by scanning electron microscopy, and the SEM images of each sample were obtained as shown in FIG. Figure 2 shown.

[0084] from Figure 1It can be seen that the diffraction angles of Bi2O2CO3 prepared in Example 1 of the present invention are 12.93°, 23.901°, 26.033°, 30.251°, 32.728°, 35.307°, 39.509°, 40.358°, 48.929°, 54.51°, 56.896°, and 63.011°, respectively corresponding to crystal planes (002), (011), (004), (013), (110), (006), (015), (022), (024), (123), and (206). Moreover, the BiOCOOH and Bi2O2CO3 prepared by the present invention are compared with the standard cards of BiOCOOH and Bi2O2CO3, and it can be seen that the BiOCOOH and Bi2O2CO3 prepared by the present invention have higher purity, which indicates that BiOCOOH and Bi2O2CO3 can be obtained by the method of the present invention.

[0085] from Figure 1 It can also be seen that when the irradiation time is 10 min, new diffraction peaks appear at 12.93°, 23.90° and 32.73°. Compared with the standard card PDF#41-1488, these three peaks correspond to the (002), (011) and (110) crystal planes of (BiO)2CO3, respectively, which indicates that the phase of the sample begins to change from BiOCOOH to (BiO)2CO3. At this time, the color of the sample changes from white to light gray, as shown in Figure 2. Figure 2 As shown. When the irradiation time is extended to 20 minutes, it can be clearly observed that the diffraction peak of BiOCOOH gradually weakens, and the diffraction peak of (BiO)2CO3 gradually strengthens. At this time, the sample is still a composite phase composed of BiOCOOH and (BiO)2CO3, and the powder sample turns dark gray. Further extending the irradiation time to 30 minutes, it can be seen from the diffraction spectrum that the sample phase has completely transformed into (BiO)2CO3.

[0086] The XRD patterns of the samples prepared in Comparative Examples 3 and 4 and the BiOCOOH and Bi2O2CO3 standard cards PDF#41-1488 are shown in Figure 3 As shown. Figure 3 It can be seen that the diffraction peaks of the samples prepared in Comparative Examples 3 and 4 are inconsistent with the standard cards of BiOCOOH and Bi2O2CO3, indicating that the synthesized photocatalysts are not pure BiOCOOH and Bi2O2CO3.

[0087] Application Example 1

[0088] The Bi2O2CO3 photocatalyst prepared in Example 1 was used to degrade Rhodamine B, and the steps were as follows: the activity of the prepared photocatalyst was detected by simulating sunlight with a 1000W xenon lamp to degrade the organic dye Rhodamine B (RhB). 30 mg of the photocatalyst was dispersed in 30 mL of 10 mg / RhB solution and stirred in the dark for 30 min. The light source was turned on, and 4 mL of the solution was taken out in a centrifuge tube every 15 min and centrifuged. The supernatant was taken and the absorption spectrum of the solution was measured by a UV-visible spectrometer.

[0089] The comparison of the degradation effects of Rhodamine B using B-30 prepared in Example 1, BiOCOOH, B-10 prepared in Comparative Example 1, B-20 prepared in Comparative Example 2, the photocatalyst (Water) prepared in Comparative Example 3, and the photocatalyst (Ethanol) prepared in Comparative Example 4 is shown in the figure below. Figure 4 As shown. Figure 4 It can be seen that the B-30 prepared in Example 1 exhibits better photocatalytic degradation activity of Rhodamine B than other photocatalysts. It can be calculated that B-30 can degrade 78.1% of RhB in 1 hour, and has an excellent degradation effect.

[0090] From the above results, it can be seen that the method provided by the present invention can significantly shorten the synthesis time of Bi2O2CO3 photocatalyst and can be prepared on a large scale, thus solving the problems of long cycle, high cost and inability to prepare on a large scale in conventional Bi2O2CO3 synthesis methods.

[0091] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a Bi2O2CO3 photocatalyst, comprising the following steps: (1) mixing BiOCOOH, deionized water and ethanol to obtain a BiOCOOH mixed solution; (2) irradiating the BiOCOOH mixed solution obtained in step (1) under a mercury lamp to obtain a Bi2O2CO3 photocatalyst; the power of the mercury lamp is 900-1000W; and the irradiation time is 30-33 minutes.

2. The preparation method according to claim 1, characterized in that: The preparation method of BiOCOOH in step (1) comprises: subjecting a bismuth salt solution to a solvothermal reaction to obtain BiOCOOH.

3. The preparation method according to claim 2, characterized in that: The concentration of the bismuth salt solution is 0.015-0.02 mmol / mL.

4. The preparation method according to claim 2, characterized in that: The temperature of the solvent thermal reaction is 115-125° C., and the time of the solvent thermal reaction is 11-13 hours.

5. The preparation method according to claim 1, characterized in that: The volume ratio of deionized water to ethanol in the step (1) is (28-32):(13-17).

6. The preparation method according to claim 1, characterized in that: The ratio of the mass of BiOCOOH to the total volume of deionized water and ethanol in the step (1) is (50-53) mg: (43-47) mL.

7. The preparation method according to claim 1, characterized in that: The power of the mercury lamp in step (2) is 1000W.

8. The preparation method according to claim 7, characterized in that: The irradiation time in step (2) is 30 minutes.

9. The Bi2O2CO3 photocatalyst prepared by the preparation method according to any one of claims 1 to 8.

10. Use of the Bi2O2CO3 photocatalyst according to claim 9 in the degradation of Rhodamine B.

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