Au nanorod doped Bi4O5I2 nano photocatalyst and preparation method thereof
By doping Au nanorods into Bi4O5I2, adjusting their morphological dimensions and suppressing carrier recombination through Schottky barriers, the problem of insufficient photocatalytic activity of Bi4O5I2 photocatalysts is solved, and the photocatalytic activity and degradation efficiency are significantly improved. effect.
Patent Information
- Application Number
- CN202411540018.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-02-14
AI Technical Summary
In practical applications, the photocatalyst has a high photocatalytic recombination rate due to the narrow bandwidth, which reduces the photocatalytic activity and leads to insufficient photocatalytic activity.
By doping Au nanorods into Bi4O5I2, using solvent heat and calcination reaction, Au nanorod doped Bi4O5I2 nanophotocatalyst was prepared, and the morphology size of Au nanomicrospheres was adjusted, thereby enhancing the surface plasmon resonance effect (SPR) and improving The visible light absorption rate is suppressed by the Schottky barrier.
The photocatalytic activity and degradation efficiency are significantly improved. Au nanorod doped Bi4O5I2 nanophotocatalyst can efficiently catalyze the degradation of organic pollutants such as antibiotics under visible light conditions, and the material has good stability and reuse performance.
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Figure CN119425740A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of photocatalysis, and in particular to an Au nanorod-doped Bi4O5I2 nanophotocatalyst and a preparation method thereof. Background Art
[0002] With the role of semiconductor material photocatalytic technology in environmental purification and light energy conversion, its photocatalytic technology has received widespread attention in recent years.
[0003] So far, researchers have developed different types of photocatalysts for photocatalytic degradation of organic pollutants in water. Among many semiconductor materials, Bi4O5I2 has been widely studied because of its narrow bandgap, good visible light response, high photocatalytic activity, non-toxicity, low price and strong chemical stability. However, in practical applications, Bi4O5I2 still has some disadvantages. The biggest disadvantage is the high recombination rate of photogenerated carriers inside the material caused by the narrow bandwidth, which reduces the photocatalytic activity and leads to insufficient photocatalytic activity.
[0004] Au nanoparticles doped with Bi4O5I2 can effectively improve this problem. Studies in recent years have found that the shape and size of Au nanoparticles are an important factor affecting their physical and chemical properties. However, how to stably dope Au nanoparticles into Bi4O5I2 to improve photocatalytic activity and degradation efficiency is still difficult. Therefore, an Au nanorod doped Bi4O5I2 nanophotocatalyst and its preparation method are proposed to solve this problem. Summary of the invention
[0005] The purpose of the present invention is to provide an Au nanorod-doped Bi4O5I2 nanophotocatalyst and a preparation method thereof to solve the problems raised in the above background technology.
[0006] To achieve the above object, the present invention provides the following technical solution: a method for preparing Au nanorod-doped Bi4O5I2 nanophotocatalyst, the preparation method comprising the following steps: S1, preparation of Au nanorod seeds; S2, preparation of Au nanorods: add hexadecyltrimethylammonium bromide solution to chloroauric acid solution, then add silver nitrate solution and vitamin C solution to the mixed solution, then add the dark purple Au nanorod seed solution prepared in S1 to the mixed solution, keep the mixed solution static, and after the reaction, centrifuge and wash with deionized water for several times to remove hexadecyltrimethylammonium bromide to obtain purple-red Au nanorods; S3, prepare a nitric acid aqueous solution, dissolve Bi(NO3)3·5H2O and NaI in a nitric acid aqueous solution according to a specified ratio to form solution A and solution B, and then add NaOH lye to obtain a white solution; S4, adding 10-100 μL of purple-red Au nanorods prepared in S2 and 1 g of sodium dodecylbenzene sulfonate to the white solution, stirring until the sodium dodecylbenzene sulfonate is completely dissolved to obtain a mixed solution; S5. The mixed solution is transferred to a Teflon reactor, and the precipitated powder is prepared and placed in a tubular furnace. The powder is calcined in a nitrogen environment to obtain Au nanorod-doped Bi4O5I2 nanophotocatalyst.
[0007] Preferably, in S1, the method for preparing Au nanorod seeds comprises the following steps: S11, adding a 1 g / L chloroauric acid solution to a 0.1 M hexadecyltrimethylammonium bromide solution, and mixing the solutions to obtain a mixed solution; S12. Add 0.01 mL of sodium borohydride ice water solution to the mixed solution in S11 and keep it in a static state at 30°C for 2-24 hours to obtain deep purple Au nanorod seeds.
[0008] Preferably, in S11, the extraction amount of the chloroauric acid solution is 1.1 mL, the amount of the hexadecyltrimethylammonium bromide solution is 10 mL, and the amount of the 0.01 mM sodium borohydride ice water solution added in S12 is 0.6 mL.
[0009] Preferably, in S2, the specific dosage of the hexadecyltrimethylammonium bromide solution added to the chloroauric acid solution is to add 5 mL of 0.2 M hexadecyltrimethylammonium bromide solution to 2 mL of 1 g / L chloroauric acid solution, then add 80 μL of 0.01 M silver nitrate solution and 70 μL of 0.1 M vitamin C solution to the above mixture, and add 60 μL of the dark purple Au nanorod seed solution prepared in S1 to the mixture.
[0010] Preferably, in S2, the mixed solution needs to be kept at a static state at 30° C. for 10-24 hours, and after the reaction, the mixed solution is centrifuged and washed with deionized water for multiple times to remove the hexadecyltrimethylammonium bromide, thereby obtaining purple-red Au nanorods.
[0011] Preferably, in S3, the preparation method of the nitric acid aqueous solution is as follows: Concentrated nitric acid and water are mixed in a volume ratio of 1:1 to obtain a 50% nitric acid aqueous solution.
[0012] Preferably, in S3, solution A is prepared by dissolving 2 mM Bi(NO3)3·5H2O in 30 ml of 50% nitric acid aqueous solution, and solution B is prepared by dissolving 2 mM NaI in another 30 ml of 50% nitric acid aqueous solution. Solution B is slowly added dropwise to solution A with continuous stirring to obtain a deep red BiOI solution, and NaOH alkaline solution is added to the BiOI solution to adjust the pH to 10 to obtain a white solution.
[0013] Preferably, in S5, the mixed solution is transferred to a Teflon reactor, the temperature of the Teflon reactor is raised to 120-180° C., and the reaction is carried out at a constant temperature for 6-24 hours to generate a precipitate, which is then dried and separated to obtain a precipitated powder.
[0014] Preferably, in S5, the precipitated powder is placed in a tubular furnace, the temperature of the tubular furnace is raised to 300-400°C under a nitrogen atmosphere in the tubular furnace, and the precipitated powder is calcined for 3-4h, and the heating rate of the tubular furnace is 10°C / min.
[0015] The present invention also provides an Au nanorod-doped Bi4O5I2 nanophotocatalyst, wherein the Au nanorod-doped Bi4O5I2 nanophotocatalyst comprises a product prepared by the preparation method of the Au nanorod-doped Bi4O5I2 nanophotocatalyst as described in claims 1-9.
[0016] Technical effects and advantages of the present invention: 1. The present invention utilizes simple solvent thermal and calcination reactions to prepare Au nanorod-doped Bi4O5I2 photocatalysts, and enhances the surface plasmon resonance (SPR) effect by adjusting the morphology and size of Au nanospheres from nanospheres to nanorods, thereby improving the visible light absorption rate of the material through SPR.
[0017] 2. The present invention utilizes simple solvent thermal and calcination reactions to prepare Au nanorod-doped Bi4O5I2 photocatalysts, thereby promoting the formation of Schottky barriers between the Au nanorods and Bi4O5I2 interfaces, which serve as electron capture traps, thereby inhibiting the recombination of photogenerated carriers and thereby improving the photocatalytic activity. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 XRD diagram of the Au nanorod-doped Bi4O5I2 nano-photocatalyst and the Bi4O5I2 material alone prepared in Example 1 of the present invention, where * represents the peak of Bi4O5I2 and & represents the peak of Au.
[0019] Figure 2 This is the SEM image of the Au nanorods doped with Bi4O5I2 nanomaterials prepared in Example 1 of the present invention.
[0020] Figure 3This is the SEM image of the individual Bi4O5I2 nanomaterial prepared in Example 1 of the present invention.
[0021] Figure 4 This is the TEM image of Au nanorods prepared in Example 1 of the present invention.
[0022] Figure 5 This is a comparison chart of the degradation of antibiotics under visible light by the Au nanorods doped with Bi4O5I2 nanophotocatalyst of the present invention, a single Bi4O5I2 photocatalyst, and commercial TiO2.
[0023] Figure 6 This is a diagram showing the effect of recycling the Au nanorods doped with Bi4O5I2 nanophotocatalyst prepared in Example 1 of the present invention for five times to degrade antibiotics (tetracycline hydrochloride). DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.
[0025] The present invention provides Figure 1-6 A preparation method of Au nanorod-doped Bi4O5I2 nanophotocatalyst is shown, and the preparation method comprises the following steps: S1. Preparation of Au nanorod seeds: 1.1 mL of 1 g / L chloroauric acid solution was added to 10 mL of 0.1 M hexadecyltrimethylammonium bromide solution. 0.6 mL of 0.01 mM sodium borohydride ice water solution was added to the mixture and kept at 30°C for 2-24 h to obtain dark purple Au nanorod seeds. S2, preparation of Au nanorods: Take 5mL of 0.2M hexadecyltrimethylammonium bromide solution and add it to 2mL of 1g / L chloroauric acid solution, then add 80μL of 0.01M silver nitrate solution and 70μL of 0.1M vitamin C solution to the above mixture. Then add 60μL of the dark purple Au nanoseed solution prepared in S1. Keep the mixed solution at rest at 30°C for 10-24h. After the reaction, remove the hexadecyltrimethylammonium bromide by centrifugation with deionized water several times to obtain purple-red Au nanorods; S3, prepare nitric acid aqueous solution, mix concentrated nitric acid and water in a volume ratio of 1:1 to form a 50% nitric acid aqueous solution, dissolve 2mM Bi(NO3)3·5H2O in 30ml of 50% nitric acid aqueous solution to form solution A, and dissolve 2mM NaI in another 30ml of 50% nitric acid aqueous solution to form solution B; Solution B was slowly added dropwise to solution A with continuous stirring to obtain a deep red BiOI solution; NaOH was added to the BiOI solution to adjust the pH to 10 to obtain a white solution.
[0026] S4, adding 10-100 μL of purple-red Au nanorods prepared in S2 and 1 g of sodium dodecylbenzene sulfonate to the white solution, stirring until the sodium dodecylbenzene sulfonate is completely dissolved to obtain a mixed solution; S5. Transfer the mixed solution to a Teflon reactor, heat it to 120-180°C, react at a constant temperature for 6-24 hours to generate a precipitate, dry it, and separate the precipitated powder. Put the precipitated powder into a tubular furnace, heat it to 300-400°C in a nitrogen atmosphere, and calcine it for 3-4 hours at a heating rate of 10°C / min to obtain Au nanorods doped with Bi4O5I2 nanophotocatalyst.
[0027] The invention discloses an Au nanorod doped Bi4O5I2 nano photocatalyst, wherein the Au nanorod doped Bi4O5I2 nano photocatalyst is a product prepared by the preparation method of the Au nanorod doped Bi4O5I2 nano photocatalyst.
[0028] Embodiment 1
[0029] An Au nanorod doped Bi4O5I2 nanophotocatalyst and its preparation method and application are as follows: (1) Preparation of Au nanorod seeds: 1.1 mL of 1 g / L chloroauric acid solution was added to 10 mL of 0.1 M hexadecyltrimethylammonium bromide solution. 0.6 mL of 0.01 mM sodium borohydride ice water solution was then added to the mixture and kept at 30°C for 12 h to obtain dark purple Au nanorod seeds.
[0030] (2) Preparation of Au nanorods: 5 mL of 0.2 M hexadecyltrimethylammonium bromide solution was added to 2 mL of 1 g / L chloroauric acid solution, and then 80 μL of 0.01 M silver nitrate solution and 70 μL of 0.1 M vitamin C solution were added to the mixture. Subsequently, 60 μL of the dark purple Au nanoseed solution prepared in step (1) was added. The mixed solution was kept at 30°C for 12 h. After the reaction, the hexadecyltrimethylammonium bromide was removed by centrifugation with deionized water several times to obtain purple-red Au nanorods.
[0031] (3) Mix concentrated nitric acid and water in a volume ratio of 1:1 to form a 50% nitric acid aqueous solution. Dissolve 2 mM Bi(NO3)3·5H2O in 30 ml of the 50% nitric acid aqueous solution to form solution A. Dissolve 2 mM NaI in another 30 ml of the 50% nitric acid aqueous solution to form solution B.
[0032] (4) Solution B was slowly added dropwise to solution A with continuous stirring to obtain a deep red BiOI solution.
[0033] (5) Add NaOH solution to the BiOI solution to adjust the pH to 10 to obtain a white solution.
[0034] (6) Add 50 μL of the purple-red Au nanorods prepared in (2) and 1 g of sodium dodecylbenzene sulfonate to the white solution, and stir until the sodium dodecylbenzene sulfonate is completely dissolved to obtain a mixed solution.
[0035] (7) The mixed solution was transferred to a Teflon reactor, heated to 120°C, and reacted at a constant temperature for 12 hours to generate a precipitate, which was then dried and separated to obtain a precipitated powder.
[0036] (8) The precipitated powder was placed in a tubular furnace and heated to 300 °C in a nitrogen atmosphere for calcination for 3 h at a heating rate of 10 °C / min to obtain Au nanorods doped Bi4O5I2 nano-photocatalyst.
[0037] Embodiment 2
[0038] (1) Preparation of Au nanorod seeds: 1.1 mL of 1 g / L chloroauric acid solution was added to 10 mL of 0.1 M hexadecyltrimethylammonium bromide solution. 0.6 mL of 0.01 mM sodium borohydride ice water solution was then added to the mixture and kept at 30°C for 24 h to obtain dark purple Au nanorod seeds.
[0039] (2) Preparation of Au nanorods: 5 mL of 0.2 M hexadecyltrimethylammonium bromide solution was added to 2 mL of 1 g / L chloroauric acid solution, and then 80 μL of 0.01 M silver nitrate solution and 70 μL of 0.1 M vitamin C solution were added to the mixture. Subsequently, 60 μL of the dark purple Au nanoseed solution prepared in step (1) was added. The mixed solution was kept at 30°C for 12 h. After the reaction, the hexadecyltrimethylammonium bromide was removed by centrifugation with deionized water several times to obtain purple-red Au nanorods.
[0040] (3) Mix concentrated nitric acid and water in a volume ratio of 1:1 to form a 50% nitric acid aqueous solution. Dissolve 2 mM Bi(NO3)3·5H2O in 30 ml of the 50% nitric acid aqueous solution to form solution A. Dissolve 2 mM NaI in another 30 ml of the 50% nitric acid aqueous solution to form solution B.
[0041] (4) Solution B was slowly added dropwise to solution A with continuous stirring to obtain a deep red BiOI solution.
[0042] (5) Add NaOH solution to the BiOI solution to adjust the pH to 10 to obtain a white solution.
[0043] (6) Add 50 μL of the purple-red Au nanorods prepared in (2) and 1 g of sodium dodecylbenzene sulfonate to the white solution, and stir until the sodium dodecylbenzene sulfonate is completely dissolved to obtain a mixed solution.
[0044] (7) The mixed solution was transferred to a Teflon reactor, heated to 120°C, and reacted at a constant temperature for 12 hours to generate a precipitate, which was then dried and separated to obtain a precipitated powder.
[0045] (8) The precipitated powder was placed in a tubular furnace and heated to 300 °C in a nitrogen atmosphere for calcination for 3 h at a heating rate of 10 °C / min to obtain Au nanorods doped Bi4O5I2 nano-photocatalyst.
[0046] Embodiment 3
[0047] (1) Preparation of Au nanorod seeds: 1.1 mL of 1 g / L chloroauric acid solution was added to 10 mL of 0.1 M hexadecyltrimethylammonium bromide solution. 0.6 mL of 0.01 mM sodium borohydride ice water solution was then added to the mixture and kept at 30°C for 12 h to obtain dark purple Au nanorod seeds.
[0048] (2) Preparation of Au nanorods: 5 mL of 0.2 M hexadecyltrimethylammonium bromide solution was added to 2 mL of 1 g / L chloroauric acid solution, and then 80 μL of 0.01 M silver nitrate solution and 70 μL of 0.1 M vitamin C solution were added to the mixture. Subsequently, 60 μL of the dark purple Au nanoseed solution prepared in step (1) was added. The mixed solution was kept at 30°C for 24 h. After the reaction, the hexadecyltrimethylammonium bromide was removed by centrifugation with deionized water several times to obtain purple-red Au nanorods.
[0049] (3) Mix concentrated nitric acid and water in a volume ratio of 1:1 to form a 50% nitric acid aqueous solution. Dissolve 2 mM Bi(NO3)3·5H2O in 30 ml of the 50% nitric acid aqueous solution to form solution A. Dissolve 2 mM NaI in another 30 ml of the 50% nitric acid aqueous solution to form solution B.
[0050] (4) Solution B was slowly added dropwise to solution A with continuous stirring to obtain a deep red BiOI solution.
[0051] (5) Add NaOH solution to the BiOI solution to adjust the pH to 10 to obtain a white solution.
[0052] (6) Add 50 μL of the purple-red Au nanorods prepared in (2) and 1 g of sodium dodecylbenzene sulfonate to the white solution, and stir until the sodium dodecylbenzene sulfonate is completely dissolved to obtain a mixed solution.
[0053] (7) The mixed solution was transferred to a Teflon reactor, heated to 120°C, and reacted at a constant temperature for 12 hours to generate a precipitate, which was then dried and separated to obtain a precipitated powder.
[0054] (8) The precipitated powder was placed in a tubular furnace and heated to 300 °C in a nitrogen atmosphere for calcination for 3 h at a heating rate of 10 °C / min to obtain Au nanorods doped Bi4O5I2 nano-photocatalyst.
[0055] Embodiment 4
[0056] (1) Preparation of Au nanorod seeds: 1.1 mL of 1 g / L chloroauric acid solution was added to 10 mL of 0.1 M hexadecyltrimethylammonium bromide solution. 0.6 mL of 0.01 mM sodium borohydride ice water solution was then added to the mixture and kept at 30°C for 12 h to obtain dark purple Au nanorod seeds.
[0057] (2) Preparation of Au nanorods: 5 mL of 0.2 M hexadecyltrimethylammonium bromide solution was added to 2 mL of 1 g / L chloroauric acid solution, and then 80 μL of 0.01 M silver nitrate solution and 70 μL of 0.1 M vitamin C solution were added to the mixture. Subsequently, 60 μL of the dark purple Au nanoseed solution prepared in step (1) was added. The mixed solution was kept at 30°C for 12 h. After the reaction, the hexadecyltrimethylammonium bromide was removed by centrifugation with deionized water several times to obtain purple-red Au nanorods.
[0058] (3) Mix concentrated nitric acid and water in a volume ratio of 1:1 to form a 50% nitric acid aqueous solution. Dissolve 2 mM Bi(NO3)3·5H2O in 30 ml of the 50% nitric acid aqueous solution to form solution A. Dissolve 2 mM NaI in another 30 ml of the 50% nitric acid aqueous solution to form solution B.
[0059] (4) Solution B was slowly added dropwise to solution A with continuous stirring to obtain a deep red BiOI solution.
[0060] (5) Add NaOH solution to the BiOI solution to adjust the pH to 10 to obtain a white solution.
[0061] (6) Add 10 μL of the purple-red Au nanorods prepared in (2) and 1 g of sodium dodecylbenzene sulfonate to the white solution, and stir until the sodium dodecylbenzene sulfonate is completely dissolved to obtain a mixed solution.
[0062] (7) The mixed solution was transferred to a Teflon reactor, heated to 120°C, and reacted at a constant temperature for 12 hours to generate a precipitate, which was then dried and separated to obtain a precipitated powder.
[0063] (8) The precipitated powder was placed in a tubular furnace and heated to 300 °C in a nitrogen atmosphere for calcination for 3 h at a heating rate of 10 °C / min to obtain Au nanorods doped Bi4O5I2 nano-photocatalyst.
[0064] The performance test of the Au nanorod-doped Bi4O5I2 nano-photocatalytic material prepared in Example 1 is characterized as follows: Figure 1 The XRD diagrams of the Au nanorod-doped Bi4O5I2 nanophotocatalyst and the Bi4O5I2 material prepared in Example 1 are shown in Figure 1. In the figure, * represents the peak of Bi4O5I2, and & represents the peak of Au, indicating that Au enters the Bi4O5I2 lattice and is effectively doped together, rather than simply physically mixed, which is conducive to improving the photocatalytic performance of the material.
[0065] Figure 2 This is the SEM image of the Au nanorods doped with Bi4O5I2 nanomaterials prepared in Example 1 of the present invention. Figure 3 This is the SEM image of the individual Bi4O5I2 nanomaterial prepared in Example 1 of the present invention. Figure 4 This is a TEM image of Au nanorods prepared in Example 1 of the present invention. From the image, it can be seen that the Au nanorods are relatively regular, with a length of about 45 nm and a width of about 13 nm.
[0066] Embodiment 5
[0067] The Au nanorod-doped Bi4O5I2 nanophotocatalytic material prepared in Example 1 was used as a photocatalyst to catalyze the degradation of tetracycline hydrochloride aqueous solution under visible light conditions, wherein the concentration of the tetracycline hydrochloride aqueous solution was 50 mg / L. The specific operation is as follows: Add 0.02 g of photocatalyst to 100 ml of TCH aqueous solution and stir for 30 min in a dark environment to reach adsorption equilibrium. After standing, take a sample of 3 ml, and then place the beaker under a 150W xenon lamp with a 420nm cutoff filter for irradiation, and take a sample of 3 ml every 20 min until 140 min. Centrifuge the sample and take the supernatant to measure the content of tetracycline hydrochloride in high performance liquid chromatography; The photocatalysts were replaced with commercial titanium dioxide, the Au nanorod-doped Bi4O5I2 nanophotocatalytic material of the present invention, the Bi4O5I2 material alone, and a blank sample without catalyst, and other conditions remained unchanged. The photocatalytic degradation test was carried out using the same operation method as above. The catalytic degradation effects of various catalysts on TCH are shown in Figure 2. Figure 5 . As can be seen from the figure, when Au nanorods doped Bi4O5I2 nanophotocatalyst was irradiated with visible light for 100 minutes, the Au nanorods doped Bi4O5I2 nanophotocatalyst completely degraded 100mL of 50mg / L TC solution. While commercial TiO2 has basically no degradation effect on TC of this concentration under visible light, the Au nanorods doped Bi4O5I2 nanophotocatalyst prepared by the present invention exhibits the best catalytic performance. Therefore, the Au nanorods doped Bi4O5I2 nanophotocatalyst of the present invention has significant visible light photocatalytic activity, and can completely catalytically degrade antibiotic organic pollutants under the condition of extremely small catalyst dosage.
[0068] Embodiment 6
[0069] After the photocatalytic degradation experiment in Example 5, the photocatalyst in the solution was washed and dried, and then reused to degrade the TC solution. After the degradation experiment, the catalyst was recovered again and reused for the third time. The recycling was repeated five times in total. The catalytic degradation effect of these five recyclings is shown in FIG. Figure 6 It can be seen that after five cycles of use, the degradation rate of the photocatalyst remains unchanged, indicating that the Au nanorod-doped Bi4O5I2 nanophotocatalytic material of the present invention has good stability in water and can be reused many times.
[0070] In summary, the present invention provides an Au nanorod-doped Bi4O5I2 nanophotocatalyst, which has better visible light degradation effect and photocatalytic activity than the existing Bi4O5I2 nanophotocatalyst.
[0071] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A method for preparing Au nanorod-doped Bi4O5I2 nanophotocatalyst, characterized in that: The preparation method comprises the following steps: S1, preparation of Au nanorod seeds; S2, preparation of Au nanorods: add hexadecyltrimethylammonium bromide solution to chloroauric acid solution to obtain a mixed solution, then add silver nitrate solution and vitamin C solution to the mixed solution, then add the dark purple Au nanorod seed solution prepared in S1, keep the mixed solution static, and after the reaction, centrifuge and wash with deionized water for several times to remove hexadecyltrimethylammonium bromide to obtain purple-red Au nanorods; S3, prepare a nitric acid aqueous solution, dissolve Bi(NO3)3·5H2O and NaI in the nitric acid aqueous solution according to the specified ratio, respectively, to form solution A and solution B, and then add NaOH lye to obtain a white solution; S4, adding the purple-red Au nanorods and sodium dodecylbenzene sulfonate prepared in S2 to the white solution, stirring until the sodium dodecylbenzene sulfonate is completely dissolved to obtain a mixed solution; S5. The mixed solution is transferred to a Teflon reactor, and the precipitated powder is prepared and placed in a tubular furnace. The powder is calcined in a nitrogen environment to obtain Au nanorod-doped Bi4O5I2 nanophotocatalyst.
2. The method for preparing a Au nanorod-doped Bi4O5I2 nanophotocatalyst according to claim 1, characterized in that: In S1, the method for preparing Au nanorod seeds comprises the following steps: S11, adding a 1 g / L chloroauric acid solution to a 0.1 M hexadecyltrimethylammonium bromide solution, and mixing the solutions to obtain a mixed solution; S12. Add 0.01 mM sodium borohydride ice water solution to the mixed solution in S11 and keep it in a static state at 30° C. for 2-24 hours to obtain deep purple Au nanorod seeds.
3. The method for preparing the Au nanorod-doped Bi4O5I2 nanophotocatalyst according to claim 2, characterized in that: In the S11, the extraction amount of the chloroauric acid solution is 1.1 mL, the amount of the hexadecyltrimethylammonium bromide solution is 10 mL, and the added amount of the 0.01 mM sodium borohydride ice water solution in the S12 is 0.6 mL.
4. The method for preparing a Au nanorod-doped Bi4O5I2 nanophotocatalyst according to claim 1, characterized in that: In S2, the specific dosage of the hexadecyltrimethylammonium bromide solution added to the chloroauric acid solution is to take 5 mL of 0.2 M hexadecyltrimethylammonium bromide solution and add it to 2 mL of 1 g / L chloroauric acid solution, then add 80 μL of 0.01 M silver nitrate solution and 70 μL of 0.1 M vitamin C solution to the above mixture, and add 60 μL of the dark purple Au nanorod seed solution prepared in S1 to the mixture.
5. The method for preparing the Au nanorod-doped Bi4O5I2 nanophotocatalyst according to claim 1, characterized in that: In the S2, the mixed solution needs to be kept at a static state at 30°C for 10-24 hours. After the reaction, the mixed solution is centrifuged and washed with deionized water for multiple times to remove the hexadecyltrimethylammonium bromide, thereby obtaining purple-red Au nanorods.
6. The method for preparing the Au nanorod-doped Bi4O5I2 nanophotocatalyst according to claim 1, characterized in that: In S3, the preparation method of the nitric acid aqueous solution is as follows: Concentrated nitric acid and water are mixed in a volume ratio of 1:1 to obtain a 50% nitric acid aqueous solution.
7. The method for preparing the Au nanorod-doped Bi4O5I2 nanophotocatalyst according to claim 1, characterized in that: In the S3, solution A is prepared by dissolving 2 mM Bi(NO3)3·5H2O in 30 ml of a 50% nitric acid aqueous solution, and solution B is prepared by dissolving 2 mM NaI in another 30 ml of a 50% nitric acid aqueous solution. Solution B is slowly added dropwise to solution A with continuous stirring to obtain a deep red BiOI solution. NaOH alkaline solution is added to the BiOI solution to adjust the pH to 10 to obtain a white solution.
8. The method for preparing Au nanorod-doped Bi4O5I2 nanophotocatalyst according to claim 1, characterized in that: In S5, the mixed solution is transferred to a Teflon reactor, the temperature of the Teflon reactor is raised to 120-180° C., and the reaction is carried out at a constant temperature for 6-24 hours to generate a precipitate, which is then dried and separated to obtain a precipitated powder.
9. The method for preparing the Au nanorod-doped Bi4O5I2 nanophotocatalyst according to claim 1, characterized in that: In S5, the precipitated powder is placed in a tubular furnace, and the temperature of the tubular furnace is raised to 300-400° C. under a nitrogen atmosphere in the tubular furnace, and the precipitated powder is calcined for 3-4 hours, and the heating rate of the tubular furnace is 10° C. / min.
10. An Au nanorod doped Bi4O5I2 nanophotocatalyst, characterized in that: The Au nanorod-doped Bi4O5I2 nanophotocatalyst includes a product prepared by the preparation method of the Au nanorod-doped Bi4O5I2 nanophotocatalyst as described in claims 1-9.