Molybdenum-doped nano-zinc oxide with high visible-light photocatalytic performance and preparation method and application thereof

Abstract

The application discloses molybdenum-doped nano zinc oxide with high visible light photocatalytic performance and a preparation method and application thereof. The molybdenum-doped nano zinc oxide is prepared from 1-octadecene, 1-dodecanol, oleic acid, a zinc source and a molybdenum source through vacuum degassing treatment, uniform stirring under a nitrogen atmosphere, heating to 100-140 DEG C, keeping warm until solid particles are dissolved, heating to 220-250 DEG C, keeping warm for 0.5-1 h of reaction, and cooling, washing and drying. The molybdenum-doped nano zinc oxide produces a local surface plasmon resonance absorption peak in the range of 600-700 nm through molybdenum ion doping, and the nano powder has a diameter of 5-20 nm; and the visible light photocatalytic performance of the zinc oxide material is greatly improved under the condition of visible light.

Description

Technical Field

[0001] This invention relates to the field of photocatalysis, specifically to a molybdenum-doped zinc oxide nanoparticle with high visible light photocatalytic performance, its preparation method, and its application. Background Technology

[0002] Photocatalysis is a technology that uses light energy to drive chemical reactions and is widely used in environmental remediation, energy conversion, and chemical synthesis. Zinc oxide (ZnO) has become a promising photocatalytic material due to its excellent optical properties, wide band gap (approximately 3.37 eV), high chemical stability, and environmental friendliness. The photocatalytic mechanism of ZnO is mainly based on its ability to absorb ultraviolet light, exciting electrons to the conduction band and simultaneously generating electron-hole pairs on the surface. These charge carriers can participate in the degradation of organic pollutants or water splitting reactions. However, the wide band gap of ZnO means that it can only effectively absorb ultraviolet light, limiting its photocatalytic activity in the visible light region.

[0003] To address the limitations of ZnO in photocatalytic applications, existing technologies have attempted to dope or modify ZnO through various means to broaden its absorption range and improve photocatalytic efficiency. Chinese invention patent application 202411178170.9 discloses a cobalt-doped nano-zinc oxide and its green synthesis method and application. Chinese invention patent CN112499664B discloses a cuprous oxide-doped nano-zinc oxide composite material and its preparation method. Chinese invention patent application CN201410431213.X discloses a method for preparing molybdenum-doped zinc oxide thin films by magnetron sputtering; however, its high transmittance in the visible light region makes visible light photocatalysis difficult. This invention, through a one-pot synthesis of molybdenum-doped nano-zinc oxide with oxygen vacancies, generates localized surface plasmon resonance absorption peaks in the visible light region, achieving its photocatalytic effect in visible light.

[0004] Chinese invention patent CN113559913B discloses a sandwich-structured nitrogen-doped zinc oxide-coated nitrogen-doped graphene composite material, its preparation method, and its application. This method combines zinc oxide with graphene, broadening the photoresponse range of zinc oxide to the visible light spectrum through nitrogen doping. The nitrogen-doped graphene-loaded zinc oxide promotes photogenerated electron transport, thereby improving the visible light photocatalytic efficiency of zinc oxide. However, this technology involves cumbersome preparation steps for the graphene composite material, high costs, a preparation time of up to 15 hours, and requires a high temperature of 600℃. Summary of the Invention

[0005] The purpose of this invention is to provide a simple and easy-to-implement molybdenum-doped zinc oxide nanomaterial with high visible light photocatalytic performance and its preparation method. This material significantly improves the visible light utilization rate of zinc oxide materials.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] Molybdenum-doped zinc oxide nanoparticles with high visible light photocatalytic performance are obtained by vacuum degassing of 1-octadecene, 1-dodecyl alcohol, oleic acid, zinc source and molybdenum source, uniform stirring under nitrogen atmosphere, heating to 100-140℃, holding at temperature until solid particles dissolve, heating to 220-250℃ and holding at temperature for 0.5-1h, and then cooling, washing and drying.

[0008] To further achieve the purpose of this invention, preferably, the molar ratio of 1-octadecene, zinc source, 1-dodecyl alcohol, oleic acid, and molybdenum source is (6.6-44):1:(7.2-11.2):(3-4):(0.05-0.35).

[0009] Preferably, the zinc source is one or more of zinc stearate and zinc acetylacetonate.

[0010] Preferably, the molybdenum source is one or more of molybdenum acetylacetonate, ammonium molybdate, and sodium molybdate.

[0011] Preferably, the vacuum degassing process takes 1-3 minutes.

[0012] Preferably, the time for holding the temperature at 100-140℃ until the solid particles dissolve is 20-30 minutes.

[0013] Preferably, the cooling method is to cool to 30-70°C at room temperature while maintaining nitrogen gas flow; the drying method is to dry naturally at room temperature for more than 20 minutes or to dry under vacuum at 60-80°C for 15-60 minutes.

[0014] Preferably, the washing process involves thoroughly mixing the reactants with a mixed solution of n-hexane and ethanol at a volume ratio of 1:1.5-5 after cooling, and centrifuging at 5000-10000 r / min for 5-10 mins; the process is repeated by mixing the centrifuged product with the n-hexane and ethanol mixed solution and centrifuging 2-4 times.

[0015] The method for preparing molybdenum-doped zinc oxide nanoparticles with high visible light photocatalytic performance includes the following steps:

[0016] 1) Using 1-octadecene as solvent, 1-dodecyl alcohol as activator, and oleic acid as ligand, it is mixed with zinc source and molybdenum source and subjected to vacuum degassing treatment;

[0017] 2) Stir the product obtained in step 1) under a nitrogen atmosphere until homogeneous, heat to 100-140℃, keep warm until the solid particles in the raw material dissolve, and then raise the temperature to 220-250℃ and keep warm for 0.5-1h.

[0018] 3) Cool, wash and dry the product obtained in step 2) to obtain molybdenum-doped nano zinc oxide with high visible light photocatalytic performance.

[0019] The application of molybdenum-doped zinc oxide nanoparticles with high visible light photocatalytic performance in the degradation of Rhodamine B.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1) This invention generates a local surface plasmon resonance peak with a peak value of 600-700nm by doping with molybdenum, thereby producing a strong absorption effect on visible light and thus achieving the purpose of photocatalytic degradation of Rhodamine B.

[0022] 2) The molybdenum-doped nano-zinc oxide powder of this invention introduces metal ions Mo 6+ / 5+ / 4+ Doping replaces Zn in the original lattice 2+ This significantly increases the free carrier concentration in the zinc oxide semiconductor, enabling it to generate strong localized plasmon resonance absorption in the visible light region. The absorbance in the visible light region is affected by the amount of molybdenum source used. The absorption of visible light by the product can be changed by adjusting the amount of molybdenum doping, thereby adjusting the photocatalytic degradation performance of Rhodamine B by the molybdenum-doped nano zinc oxide photocatalyst.

[0023] 3) This invention employs a one-pot method, using ligands and activators to successfully incorporate molybdenum ions into zinc oxide, and uses organic solvents to achieve the transformation of zinc precursor into ZnO, thereby improving the crystallinity of ZnO.

[0024] 4) The molybdenum-doped nano zinc oxide photocatalyst sample synthesized in this invention is very stable and can be stored for a long time. The preparation method is simple, has low equipment requirements, and a short synthesis cycle.

[0025] However, the preparation steps of graphene composite materials using this technology are cumbersome and costly, with a preparation time of up to 15 hours and a high temperature of 600°C. This invention, through a one-step synthesis, can directly prepare doped zinc oxide materials with high visible light photocatalytic effect within 2 hours at 220-250°C. Attached Figure Description

[0026] Figure 1 The X-ray diffraction patterns of the nano zinc oxide samples obtained in Comparative Examples, Example 1, Example 2, Example 3, and Example 4 are shown.

[0027] Figure 2a This is a transmission electron microscope (TEM) image of the product sample obtained in Example 2.

[0028] Figure 2b This is a diagram showing the interplanar spacing of the product sample obtained in Example 2.

[0029] Figure 3The absorbance spectra are those of the nano zinc oxide powders obtained in Comparative Example 1, Example 1, and Example 2 after being prepared into dispersions.

[0030] Figure 4 The graphs show the degradation of 20 mg / L Rhodamine B solution under a xenon lamp, as well as the degradation curves of Rhodamine B under a xenon lamp in the comparative examples, Example 1, and Example 2.

[0031] Figure 5 The first-order kinetic curves of the degradation of Rhodamine B under a xenon lamp are shown for comparative examples, Example 1, and Example 2. Detailed Implementation

[0032] The present invention will be further described below with reference to embodiments and accompanying drawings to illustrate and explain the present invention, but the embodiments of the present invention are not limited thereto.

[0033] This invention employs a method of thermally decomposing an organometallic precursor in the nonpolar solvent 1-octadecene to incorporate molybdenum ions into zinc oxide. Centrifugation, washing, and drying yield molybdenum-doped nano-zinc oxide materials. The modified zinc oxide exhibits significantly improved visible light utilization efficiency and visible light photocatalytic performance. At high temperatures, due to the... 6+ Mo 5+ Mo 4+ With Zn 2+ The ionic radii of Mo are close to those of Mo, therefore, 6+ It will enter the interior of the ZnO network during the hydrolysis of the raw material and replace the Zn at the lattice sites. 2+ Ions introduce defects due to Mo 6+ / 5+ / 4+ For the original zinc oxide lattice, Zn 2+ The non-equivalent substitution introduces a large number of free electrons. The specific defect equation is shown below:

[0034]

[0035] Mo 6+ +e'→Mo 5+

[0036]

[0037] Mo 5+ +e'→Mo 4+

[0038]

[0039] This invention utilizes metal cation doping to induce localized surface plasmon resonance absorption peaks in pure zinc oxide materials, which normally have no absorption in the visible light range, within the 600-700 nm range. The nanoparticles have diameters of 5-20 nm. This significantly enhances the photocatalytic performance of the zinc oxide material in the visible light range. According to the Drude-Lorentz theory, the localized surface plasmon resonance peak redshifts with increasing dielectric constant of the surrounding environment.

[0040] The method of this invention is simple, easy to implement, and has high practical application value.

[0041] The embodiments and comparative examples in this invention were prepared and tested using the same method. The methods for testing the absorbance and photocatalytic performance of the samples are as follows:

[0042] The absorbance of the dispersion prepared by the sample was tested using a UV-Vis-NIR spectrophotometer. 0.02 g of nano zinc oxide powder was dispersed in 10 ml of tetrachloroethylene solution in the presence of 0.1 ml each of oleic acid and oleylamine. After shaking, the absorbance of the dispersion was tested using a UV-Vis-NIR spectrophotometer.

[0043] Weigh 0.05g of the materials prepared in each example and place them in a beaker. Add a 20mg / L rhodamine solution and stir magnetically for 1 hour in the dark to reach adsorption equilibrium. Then, use a 300W ambient lamp as the visible light source, with a lamp distance of 15cm, and irradiate the rhodamine solution. Remove the solution from the beaker every 15 minutes and continue irradiation. Use an Agilent Cary 60 UV-Vis spectrophotometer to measure the concentration of the rhodamine solution at different irradiation times. The visible light photocatalytic performance of the prepared materials is evaluated based on the measured rhodamine concentration.

[0044] To better compare the photocatalytic efficiency of different catalysts, a kinetic analysis was performed on the degradation of Rhodamine B solution in water. A scatter plot was plotted with ln(C0 / C) on the ordinate and time t (mins) on the abscissa, and then fitted. The linear simulation curves of the photocatalytic degradation of Rhodamine B by different catalysts showed a linear relationship between ln(C0 / C) and catalytic time t. Due to the low initial concentration of reactants, the degradation reaction conforms to the Langmuir-Hin Shelwood apparent first-order kinetic model. The simplified apparent first-order kinetic model is as follows:

[0045] ln(C0 / C)=k app t

[0046] C0 is the initial concentration of the reactant (mg / L), C is the concentration of the reactant at time t (mg / L), and k app is the apparent first-order rate constant, and t is the reaction time (light exposure time).

[0047] Comparative Example

[0048] Zinc oxide from Fuchen Chemical Reagent Factory was used in this comparative example. It showed no absorption peak in the visible light range, and its apparent rate constant was 0.0004 mins. -1 .

[0049] Example 1

[0050] A method for preparing molybdenum-doped zinc oxide nanoparticles with high visible light photocatalytic performance, comprising the following steps:

[0051] 1) Weigh 4.8g of 1-dodecyl alcohol, 21ml of 1-octadecene, and 2.65g of oleic acid and add them to a 250ml three-necked flask. Then add 3mmol of zinc stearate and 0.15mmol of molybdenum acetylacetonate to the three-necked flask. The molar ratio of molybdenum to zinc is 0.05.

[0052] 2) Place the three-necked flask in a heat-collecting constant temperature magnetic stirrer, degas it under vacuum for 1 minute, then introduce nitrogen gas for oil bath heating and stirring. Heat to 100°C and keep warm for 20 minutes until all solid particles are dissolved.

[0053] 3) After the previous step is completed, continue to purge with nitrogen and heat until the temperature reaches 220℃, then keep it at that temperature for 0.5h. After the reaction is complete, let the product cool naturally to 26℃, mix it thoroughly with a 1:1.5 volume ratio of n-hexane and ethanol, and centrifuge at 5000r / mins for 5mins. Repeat the process of mixing the centrifuged product with the above ratio of n-hexane and ethanol and centrifuging twice more. Finally, let the centrifuged sample air dry for 20mins. The resulting product is the molybdenum-doped nano zinc oxide photocatalyst.

[0054] Example 2

[0055] A method for preparing molybdenum-doped zinc oxide nanoparticles with high visible light photocatalytic performance, comprising the following steps:

[0056] 1) Weigh 4.8g of 1-dodecyl alcohol, 21ml of 1-octadecene, and 2.65g of oleic acid and add them to a 250ml three-necked flask. Then add 3mmol of zinc stearate and 1.05mmol of molybdenum acetylacetonate to the three-necked flask. The molar ratio of molybdenum to zinc is 0.35.

[0057] 2) Place the three-necked flask in a heat-collecting constant temperature magnetic stirrer, degas it under vacuum for 3 minutes, then introduce nitrogen gas for oil bath heating and stirring. Heat to 140°C and keep warm for 30 minutes until all solid particles are dissolved.

[0058] 3) After the previous step is completed, continue to purge with nitrogen and heat until the temperature reaches 250℃, then keep it at that temperature for 0.5h. After the reaction is complete, let the product cool naturally to 26℃. Mix the reactants thoroughly with a hexane and ethanol mixture at a volume ratio of 1:1.5, then centrifuge at 10000r / mins for 10mins. Repeat this process 4 times, mixing the centrifuged product with the hexane and ethanol mixture at the same ratio. Finally, let the centrifuged sample air dry for 60mins. The resulting product is the molybdenum-doped nano zinc oxide photocatalyst.

[0059] Example 3

[0060] A method for preparing molybdenum-doped zinc oxide nanoparticles with high visible light photocatalytic performance, comprising the following steps:

[0061] 1) Weigh 4.8g of 1-dodecyl alcohol, 21ml of 1-octadecene, and 2.65g of oleic acid and add them to a 250ml three-necked flask. Then add 3mmol of zinc stearate and 0.15mmol of molybdenum acetylacetonate to the three-necked flask. The molar ratio of molybdenum to zinc is 0.05.

[0062] 2) Place the three-necked flask in a heat-collecting constant temperature magnetic stirrer, degas it under vacuum for 3 minutes, then introduce nitrogen gas for oil bath heating and stirring. Heat to 140°C and keep warm for 30 minutes until all solid particles are dissolved.

[0063] 3) After the previous step is completed, continue to purge with nitrogen and heat until the temperature reaches 250℃, then keep it at that temperature for 1 hour. After the reaction is complete, allow the product to cool naturally to 26℃. Mix the reactants thoroughly with a 1:5 (v / v) hexane and ethanol mixture, then centrifuge at 5000 r / min for 5 mins. Repeat this process twice more, mixing the centrifuged product with the hexane and ethanol mixture in the same ratio. Finally, dry the centrifuged sample under vacuum at 60℃ for 15 mins. The resulting product is the molybdenum-doped nano zinc oxide photocatalyst.

[0064] Example 4

[0065] A method for preparing molybdenum-doped zinc oxide nanoparticles with high visible light photocatalytic performance, comprising the following steps:

[0066] 1) Weigh 4.8g of 1-dodecyl alcohol, 21ml of 1-octadecene, and 2.65g of oleic acid and add them to a 250ml three-necked flask. Then add 3mmol of zinc acetylacetonate and 0.15mmol of molybdenum acetylacetonate to the three-necked flask. The molar ratio of molybdenum to zinc is 0.05.

[0067] 2) Place the three-necked flask in a heat-collecting constant temperature magnetic stirrer, degas it under vacuum for 3 minutes, then introduce nitrogen gas for oil bath heating and stirring. Heat to 140°C and keep warm for 30 minutes until all solid particles are dissolved.

[0068] 3) After the previous step is completed, continue to purge with nitrogen and heat until the temperature reaches 220℃, then keep it at that temperature for 0.5h. After the reaction is complete, allow the product to cool naturally to 26℃. Mix the reactants thoroughly with a 1:5 (v / v) hexane and ethanol mixture, then centrifuge at 10000 r / mins for 10 mins. Repeat this process four times, mixing the centrifuged product with the hexane and ethanol mixture in the same ratio. Finally, dry the centrifuged sample under vacuum at 80℃ for 60 mins. The resulting product is the molybdenum-doped nano zinc oxide photocatalyst.

[0069] Example 5

[0070] A method for preparing molybdenum-doped zinc oxide nanoparticles with high visible light photocatalytic performance, comprising the following steps:

[0071] 1) Weigh 4.8g of 1-dodecyl alcohol, 21ml of 1-octadecene, and 2.65g of oleic acid and add them to a 250ml three-necked flask. Then add 3mmol of zinc acetylacetonate and 1.05mmol of molybdenum acetylacetonate to the three-necked flask. The molar ratio of molybdenum to zinc is 0.35.

[0072] 2) Place the three-necked flask in a heat-collecting constant temperature magnetic stirrer, degas it under vacuum for 3 minutes, then introduce nitrogen gas for oil bath heating and stirring. Heat to 140°C and keep warm for 30 minutes until all solid particles are dissolved.

[0073] 3) After the previous step is completed, continue to purge with nitrogen and heat until the temperature reaches 250℃, then keep it at that temperature for 0.5h. After the reaction is complete, allow the product to cool naturally to 26℃. Mix the reactants thoroughly with a 1:3 (v / v) hexane and ethanol mixture, then centrifuge at 10000 r / mins for 5 mins. Repeat this process twice more, mixing the centrifuged product with the hexane and ethanol mixture in the same ratio. Finally, allow the centrifuged sample to air dry for 20 mins. The resulting product is the molybdenum-doped nano zinc oxide photocatalyst.

[0074] Figure 1 To compare the X-ray diffraction patterns with those of Examples 1, 2, 3, and 4, the XRD diffraction peak data all correspond to the diffraction peaks of wurtzite-type zinc oxide (JCPDS: 36-1451), which belongs to the hexagonal crystal system. The doping of molybdenum ions does not change the crystal form of zinc oxide. On the other hand, compared with the pure zinc oxide sample (Comparative Example 1), the diffraction angle of the (101) crystal plane of the molybdenum-doped sample (Example 1) has begun to shift towards a smaller angle. With the further introduction of molybdenum ions (Example 2), the peak position shift of the diffraction peak increases. According to the Bragg equation 2dsinθ=nλ, as θ decreases, the interplanar spacing d increases. This is because after doping, Mo... 6+ / 5+ / 4+ Replaces Zn in the zinc oxide lattice2+ This causes lattice expansion, thereby increasing the interplanar spacing. Figure 3 The absorbance spectra of each sample show that, compared with the pure zinc oxide sample of the comparative example, the absorbance curve of the doped sample changed significantly in the visible light region. This is due to the local plasmon resonance phenomenon, which proves that the synthesized Examples 1, 2, 3 and 4 are the corresponding molybdenum-doped wurtzite type zinc oxide.

[0075] Figure 2a and Figure 2b The images show the morphology and size diagrams and interplanar spacing diagrams of the samples obtained in Example 2. It can be seen that the molybdenum-doped zinc oxide nanoparticles synthesized at 250℃ have a soybean-like shape and a diameter of 5-20 nm.

[0076] Figure 3 The absorbance spectra of the samples obtained in Comparative Example 1 and Example 2 after being prepared into solutions are shown. The pure zinc oxide sample (Comparative Example 1) has no absorption peak in the visible light region, while the molybdenum-doped zinc oxide shows an absorption peak near 650 nm.

[0077] Figure 4 The degradation curves of Rhodamine B under visible light irradiation in comparative examples, Examples 1, 2, 3, 4, and 5 are shown. Figure 5 for Figure 4 The corresponding first-order kinetic curves are shown. Under xenon lamp irradiation, pure zinc oxide (comparative example) showed almost no degradation after 90 mins. Molybdenum-doped nano-zinc oxide improved the photocatalytic performance of pure zinc oxide to varying degrees. Example 1 showed a degradation of 59.65% after 90 mins, Example 2 a degradation of 75.31% after 90 mins, Example 3 a degradation of 56.33% after 90 mins, Example 4 a degradation of 60.51% after 90 mins, and Example 5 a degradation of 75.39% after 90 mins. The apparent rate constants for Examples 1 and 2, and Examples 3, 4, and 5 were 0.01006 mins, respectively. -1 0.01665min -1 0.00906min -1 0.01086min -1 0.01551min -1 These are pure zinc oxide catalysts (0.00044 min). -1 The 23, 38, 21, 25, and 36 times increase in the photocatalytic rate of molybdenum-doped zinc oxide nanoparticles significantly improves the photocatalytic degradation rate of Rhodamine B, demonstrating that molybdenum ion doping can enhance the photocatalytic degradation performance of zinc oxide nanoparticles for Rhodamine B.

[0078] As can be seen from the test results and accompanying drawings of the embodiments of the present invention, the present invention prepares molybdenum-doped zinc oxide nanomaterials through a simple one-step synthesis process, which is simple and easy to implement. Simultaneously, the present invention improves the utilization efficiency of zinc oxide for visible light, resulting in a material with high visible light photocatalytic effect and promising application prospects.

[0079] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A molybdenum-doped nano-zinc oxide with high visible light photocatalytic performance, characterized in that: The product is obtained by vacuum degassing of 1-octadecene, 1-dodecyl alcohol, oleic acid, zinc source, and molybdenum source, uniform stirring under nitrogen atmosphere, heating to 100-140℃, holding at this temperature until the solid particles dissolve, raising the temperature to 220-250℃ and holding at this temperature for 0.5-1 h, and then cooling, washing, and drying. The molar ratio of 1-octadecene, zinc source, 1-dodecyl alcohol, oleic acid, and molybdenum source is (6.6-44):1:(7.2-11.2):(3-4):(0.05-0.35). The zinc source is one or more of zinc stearate and zinc acetylacetonate. The molybdenum source is one or more of molybdenum acetylacetonate, ammonium molybdate, and sodium molybdate.

2. The molybdenum-doped zinc oxide nanoparticles with high visible light photocatalytic performance according to claim 1, characterized in that: The vacuum degassing process takes 1-3 minutes.

3. The molybdenum-doped nano-zinc oxide with high visible light photocatalytic performance according to claim 1, characterized in that: The time for holding the temperature at 100-140℃ until the solid particles dissolve is 20-30 minutes.

4. The molybdenum-doped nano-zinc oxide with high visible light photocatalytic performance according to claim 1, characterized in that: The cooling method involves maintaining nitrogen gas flow while cooling to 30-70°C at room temperature; the drying method involves natural drying at room temperature for more than 20 minutes or drying under vacuum at 60-80°C for 15-60 minutes.

5. The molybdenum-doped zinc oxide nanoparticles with high visible light photocatalytic performance according to claim 1, characterized in that: The washing process involves thoroughly mixing the cooled reaction product with a mixed solution of n-hexane and ethanol at a volume ratio of 1:1.5-5, and centrifuging at 5000-10000 r / min for 5-10 mins. The process is repeated by mixing the centrifuged product with the n-hexane and ethanol mixed solution and centrifuging 2-4 times.

6. The method for preparing molybdenum-doped zinc oxide nanoparticles with high visible light photocatalytic performance according to any one of claims 1-5, characterized in that... Includes the following steps: 1) Using 1-octadecene as solvent, 1-dodecyl alcohol as activator, and oleic acid as ligand, it is mixed with zinc source and molybdenum source and subjected to vacuum degassing treatment; 2) Stir the product obtained in step 1) under a nitrogen atmosphere until homogeneous, heat to 100-140℃, keep warm until the solid particles in the raw material dissolve, and then raise the temperature to 220-250℃ and keep warm for 0.5-1h; 3) Cool, wash and dry the product obtained in step 2) to obtain molybdenum-doped nano zinc oxide with high visible light photocatalytic performance.

7. The application of molybdenum-doped nano-zinc oxide with high visible light photocatalytic performance as described in any one of claims 1-5 in the degradation of Rhodamine B.

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