CN112675844A - Low-load AuPd modified ZnO nano material and preparation and application thereof - Google Patents
Low-load AuPd modified ZnO nano material and preparation and application thereof Download PDFInfo
- Publication number
- CN112675844A CN112675844A CN202110032820.9A CN202110032820A CN112675844A CN 112675844 A CN112675844 A CN 112675844A CN 202110032820 A CN202110032820 A CN 202110032820A CN 112675844 A CN112675844 A CN 112675844A
- Authority
- CN
- China
- Prior art keywords
- zno
- aupd
- aqueous solution
- preparation
- nano material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention relates to a ZnO nano material modified by low-load AuPd alloy, a preparation method and application thereof, belonging to the field of composite nano material preparation, and the preparation steps comprise: zinc chloride is used as a zinc source, chloroauric acid is used as a gold source, sodium chloropalladate is used as a palladium source, sodium hydroxide is used as a precipitating agent, and the ZnO nano material modified by the AuPd alloy is obtained in a solution of glycol and water by a precipitation-deposition method. The method has the advantages of simple process, low cost, low noble metal loading capacity, no addition of surfactant, preparation in one pot at room temperature, and suitability for industrial large-scale production and preparation. The ZnO nano material modified by the AuPd alloy has excellent photocatalytic performance and has important application value in the aspects of photocatalytic pollutant degradation, environmental management and the like in the future.
Description
Technical Field
The invention belongs to the field of composite nano material preparation, and particularly relates to a ZnO nano material (AuPd/ZnO) modified by a low-load AuPd alloy, and a preparation method and application thereof.
Background
The information disclosed in this background of the invention is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
As an important functional oxide semiconductor material, the zinc oxide not only has unique physical and chemical properties and good biocompatibility, but also is relatively easy to prepare and low in toxicity, so that the zinc oxide has important application value and wide application prospect in many aspects such as photocatalytic pollutant degradation, photocatalytic hydrogen production, environmental management, photoelectric devices and the like. Although zinc oxide materials have been widely researched and applied, a single zinc oxide material generates photo-generated electron-hole pairs in a photocatalytic process and is very easy to recombine, and the single zinc oxide material only responds to ultraviolet light, so that the solar utilization efficiency of the single zinc oxide material is very low. The gold nanoparticles with the surface plasmon resonance effect can effectively respond to visible light and can promote the separation of photo-generated electrons and holes; the palladium nano particles coupled with the gold nano particles can enable hot electrons generated by the gold nano particles to be rapidly conducted to the surfaces of the palladium nano particles, so that the recombination time of electron holes is further prolonged. On the other hand, due to the synergistic effect between the double metals, the catalytic activity can be further enhanced by regulating and controlling the structure, components and particle size of the double metals. The zinc oxide nano material used as the carrier not only can provide a photon-generated carrier, but also can play a role of the carrier, thereby protecting the active metal nano particles from agglomeration.
Therefore, the ZnO nano material modified by the AuPd alloy has important application value and wide application prospect in the field of photocatalysis. However, in order to prepare the AuPd alloy modified ZnO nanomaterial with excellent catalytic performance, polyvinylpyrrolidone, polydiallyldimethylammonium chloride, cetyltrimethylammonium bromide, amino acid and the like are mostly required to be added as a surfactant or a stabilizer in the preparation process, the subsequent treatment process is complicated, and the noble metal loading is relatively high in order to achieve the catalytic effect, which obviously is not beneficial to the large-scale production and application of the AuPd alloy modified ZnO nanomaterial.
Disclosure of Invention
Aiming at the technical problems, the invention provides a ZnO nano material (AuPd/ZnO) modified by a low-load AuPd alloy and a preparation method and application thereof, the preparation method can be prepared under the ambient temperature environment condition, a surfactant is not required to be added, the energy consumption is low, the cost is low, the preparation method is simple, convenient and quick, the environment is friendly, the green chemical concept is met, and the prepared AuPd/ZnO nano material has excellent photocatalytic performance and provides an important material basis for the practical application of photocatalytic pollutant degradation, environmental improvement and the like.
In order to achieve the technical effects, the invention provides the following technical scheme:
the first aspect of the invention provides a preparation method of an AuPd/ZnO nano material, wherein the AuPd/ZnO nano material is prepared by taking zinc chloride as a zinc source, chloroauric acid as a gold source, sodium chloropalladate as a palladium source, sodium hydroxide as a precipitator and no surfactant, inducer or stabilizer added in a mixed solution of ethylene glycol and water through a precipitation-deposition method.
The preparation process comprises the following specific steps:
(1) respectively preparing zinc chloride aqueous solution, sodium hydroxide aqueous solution, chloroauric acid aqueous solution and sodium chloropalladate aqueous solution with certain concentration and mixed solution of glycol and water;
(2) under the condition of stirring at room temperature, adding the zinc chloride aqueous solution, the chloroauric acid aqueous solution and the sodium chloropalladate aqueous solution prepared in the step (1) into a mixed solution of ethylene glycol and water, after uniform mixing, quickly adding the sodium hydroxide aqueous solution prepared in the step (1) into the solution, gradually changing the color of the solution into black brown, and after centrifugation, removing colorless supernatant in a centrifugal tube to obtain a black brown precipitate product; wherein the loading of the gold is about 0.15 wt%, the loading of the palladium is about 0.05 wt%, and the loading is the ratio of the mass of the gold or the palladium to the mass of the zinc oxide carrier;
(3) and (3) ultrasonically centrifuging and cleaning the black brown precipitate obtained in the step (2) by using alcohol, and drying to obtain the ZnO nano material powder modified by the AuPd alloy.
In a second aspect of the invention, the AuPd/ZnO nano material prepared by the method is provided.
The third aspect of the invention provides the application of the AuPd/ZnO nano material in the field of photocatalysis, in particular the application in the aspects of photocatalytic pollutant degradation and environmental management.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
(1) the invention provides a method for preparing a ZnO nano material modified by an AuPd alloy by a simple, convenient and rapid one-pot method at room temperature without adding a surfactant, with low energy consumption and low cost;
(2) according to the ZnO nano material modified by the AuPd alloy, the loading capacity of gold is about 0.15 wt%, the loading capacity of palladium is about 0.05 wt%, AuPd alloy nano particles are 2-5 nanometers, the loading capacity of noble metal is extremely low, and the cost can be obviously reduced;
(3) the ZnO nano material modified by the AuPd alloy has excellent photocatalytic degradation characteristic and can be recycled for multiple times;
(4) the invention does not need to add any surfactant, inducer or stabilizer, and the preparation only needs common equipment, thereby being suitable for macro, low-cost and large-scale production and being easy to meet the requirements of future commercial application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is an optical photograph taken by a digital camera after the ZnO nanomaterial powder and the AuPd/ZnO nanomaterial powder prepared in comparative example 1 and example 1 of the present invention are observed with the naked eye, where fig. 1a is an optical photograph of the zinc oxide nanomaterial powder and fig. 1b is a photograph of the AuPd/ZnO nanomaterial powder.
Fig. 2 is a Transmission Electron Microscope (TEM) photograph of the AuPd/ZnO nanomaterial prepared in example 1 of the present invention taken after observation with a JEOL-1400 TEM, in which white is marked as a part of the AuPd alloy nanoparticles.
FIG. 3 is a Transmission Electron Microscope (TEM) photograph of the ZnO, Au/ZnO, Pd/ZnO, AuPd/ZnO nanomaterials prepared by comparative examples 1, 2, 3 and 1 according to the present invention, wherein FIG. 3a is a TEM photograph of ZnO, FIG. 3b is a TEM photograph of Au/ZnO (white in the drawing is marked as a partial Au nanoparticle), FIG. 3c is a TEM photograph of Pd/ZnO (white in the drawing is marked as a partial Pd nanoparticle), and FIG. 3d is a TEM photograph of AuPd/ZnO (white in the drawing is marked as a partial AuPd alloy nanoparticle).
FIG. 4 is a photograph of AuPd/ZnO nanomaterial prepared in example 1 of the present invention taken after observation by JEOL-2100 transmission electron microscope and an EDS-mapping photograph, wherein FIG. 4a is a TEM photograph of AuPd/ZnO at low magnification, FIG. 4b is an EDS-mapping photograph of Zn element therein, FIG. 4c is an EDS-mapping photograph of Au element therein, and FIG. 4d is an EDS-mapping photograph of Pd element therein.
FIG. 5 shows the actual and theoretical contents of gold and palladium elements of AuPd/ZnO, Au/ZnO and Pd/ZnO prepared in example 1, comparative example 2 and comparative example 3 according to the present invention, measured by an inductively coupled plasma mass spectrometer.
FIG. 6 is an X-ray diffraction (XRD) pattern obtained by uniformly dispersing ZnO, Au/ZnO, Pd/ZnO, and AuPd/ZnO powder materials prepared in comparative example 1, comparative example 2, comparative example 3, and example 1 according to the present invention on a glass slide and then testing them using a Bruker D8-advanced X-ray diffractometer.
FIG. 7 shows the diffuse reflectance spectra of UV-Vis obtained from the powder materials of ZnO, Au/ZnO, Pd/ZnO and AuPd/ZnO prepared in comparative example 1, comparative example 2, comparative example 3 and example 1 of the present invention by using a Shimadzu UV-3101PC UV-Vis spectrometer.
FIG. 8 is a PL emission spectrum obtained by Edinburgh FLS920 transient steady state fluorescence spectrometer test on ZnO, Au/ZnO, Pd/ZnO, AuPd/ZnO powder materials prepared in comparative example 1, comparative example 2, comparative example 3 and example 1 of the present invention.
FIG. 9 shows the experimental results of the AuPd/ZnO material prepared in example 1 of the present invention for the catalytic degradation of rhodamine B at a concentration of 0.01 mmol/L.
FIG. 10 shows the results of 5 cycles of catalytic degradation of AuPd/ZnO material prepared in example 1 of the present invention on rhodamine B at a concentration of 0.01 mmol/L.
FIG. 11 shows the results of the catalytic degradation of 0.01 mM/L rhodamine B under the irradiation of PLS-SXE300C xenon lamp (300W) as a simulated sunlight source for ZnO, Au/ZnO, Pd/ZnO and AuPd/ZnO materials prepared in comparative example 1, comparative example 2, comparative example 3 and example 1 of the present invention.
FIG. 12 is a schematic diagram of a photocatalytic mechanism for degrading rhodamine B under simulated solar radiation of AuPd/ZnO prepared in example 1 of the present invention.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced in the background technology, the AuPd alloy modified ZnO nanomaterial and the preparation method thereof in the prior art have certain defects, and in order to solve the technical problems, the invention provides the AuPd alloy modified ZnO nanomaterial and the preparation method and application thereof. The AuPd/ZnO nano material provided by the invention provides a new way for the exploration of the photocatalyst.
In an exemplary embodiment of the present invention, a method for preparing an AuPd/ZnO nanomaterial is provided, which includes the following steps:
(1) preparing a mixed solution of glycol and water and an aqueous solution of zinc chloride, chloroauric acid, sodium chloropalladate and sodium hydroxide with certain concentration;
(2) adding the zinc chloride aqueous solution, the chloroauric acid aqueous solution and the sodium chloropalladate aqueous solution prepared in the step (1) into a mixed solution of ethylene glycol and water under the condition of stirring at room temperature, adding the sodium hydroxide aqueous solution prepared in the step (1) after uniformly stirring, wherein the solution is blackish brown in color, and removing colorless supernatant in a centrifugal tube after centrifuging to obtain a blackish brown precipitate;
(3) ultrasonically cleaning the black brown precipitation product obtained in the step (2) by using alcohol, and drying to obtain the ZnO nano material powder modified by the AuPd alloy.
Preferably, the loading amount of gold in the AuPd/ZnO nano material is about 0.15 wt%, and the loading amount of palladium is about 0.05 wt%;
preferably, in the step (1), the concentrations of the zinc chloride, the sodium hydroxide, the chloroauric acid and the sodium chloropalladate aqueous solution are respectively 1.0-5.0 mol/L, 2.0-10.0 mol/L, 0.1-0.5 mol/L and 0.1-0.5 mol/L, and the volume of the ethylene glycol in the reaction system accounts for 80% of the total volume of the water and the ethylene glycol;
preferably, in the step (2), the stirring time is 0.5-3 hours, and the centrifugal rotation speed is 8000-;
preferably, in the step (3), the alcohol is ultrasonically cleaned for 3 to 5 times, and the drying temperature is 25 to 60 ℃.
In an exemplary embodiment of the present invention, an AuPd/ZnO nanomaterial prepared by the above method is provided, which has excellent photocatalytic degradation efficiency.
In a typical embodiment of the invention, the AuPd/ZnO nanomaterial and the preparation method thereof are applied to the field of photocatalysis, particularly photocatalytic pollutant degradation and environmental management.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
Example 1
Preparation of AuPd/ZnO nano material
Firstly, adding 14 ml of deionized water into 80 ml of ethylene glycol solution, and uniformly stirring to obtain a mixed solution of ethylene glycol and water; then, 1 ml of a 5 mol/l zinc chloride aqueous solution, 30.5. mu.l of a 0.1 mol/l chloroauric acid solution and 18.8. mu.l of a 0.1 mol/l sodium chloropalladate solution were added to the mixed solution of ethylene glycol and water with rapid stirring, 5 ml of a 5 mol/l sodium hydroxide aqueous solution was rapidly added after stirring for 30 minutes, because the glycol has certain reducibility under alkaline conditions, gold ions and palladium ions in the solution are gradually reduced, the color of the solution gradually changes into black brown, wherein the volume of the ethylene glycol in the reaction system accounts for 80 percent of the total volume of the water and the ethylene glycol, after the mixture is fully stirred for 1 hour under the room temperature reaction, centrifuging at the rotation speed of 10000 r/min, removing colorless supernatant in a centrifuge tube to obtain a dark brown precipitate product, ultrasonically cleaning the obtained precipitate product for 3 times by using alcohol, and then drying in an oven at the temperature of 30 ℃ to obtain the AuPd/ZnO nano material.
Example 2
Preparation of AuPd/ZnO nano material
Firstly, adding 8 ml of deionized water into 80 ml of ethylene glycol solution, and uniformly stirring to obtain a mixed solution of ethylene glycol and water; then under the condition of rapid stirring, adding 2 ml of 2.5 mol/L zinc chloride aqueous solution, 24.4 microliter of 0.125 mol/L chloroauric acid solution and 15.0 microliter of sodium chloropalladate solution with the concentration of 0.125 mol/L into the mixed solution of ethylene glycol and water, stirring for 1 hour, rapidly adding 10 ml of 2.5 mol/L sodium hydroxide aqueous solution, and gradually changing the color of the solution into black brown, wherein the volume of the ethylene glycol in the reaction system accounts for 80 percent of the total volume of the water and the ethylene glycol, fully stirring for 1.5 hours at room temperature, centrifuging at the rotating speed of 8000 rpm, removing colorless supernatant in a centrifuge tube to obtain a black brown precipitate product, ultrasonically cleaning the obtained precipitate product for 4 times by using alcohol, and then drying in an oven at the temperature of 60 ℃ to obtain the AuPd/ZnO nano material.
The AuPd/ZnO material prepared in the embodiment is used for carrying out a catalytic degradation experiment on rhodamine B with the concentration of 0.01 millimole/liter, so that the rhodamine B can be completely degraded within 11 minutes, and the AuPd/ZnO material has excellent degradation efficiency.
Example 3
Preparation of AuPd/ZnO nano material
Firstly, adding 12 ml of deionized water into 80 ml of ethylene glycol solution, and uniformly stirring to obtain a mixed solution of ethylene glycol and water; then under the condition of rapid stirring, adding 4 ml of 1.25 mol/L zinc chloride aqueous solution, 10.2. mu.l of 0.3 mol/L chloroauric acid solution and 6.25. mu.l of sodium chloropalladate solution with the concentration of 0.3 mol/L into the mixed solution of ethylene glycol and water, stirring for 30 minutes, rapidly adding 4 ml of 6.25 mol/L sodium hydroxide aqueous solution, the color of the solution gradually changes into black brown, wherein the volume of the ethylene glycol in the reaction system accounts for 80 percent of the total volume of the water and the ethylene glycol, after fully stirring for 1 hour at room temperature, centrifuging at the rotating speed of 14000 r/min, removing colorless supernatant in a centrifugal tube to obtain a black brown precipitate product, ultrasonically cleaning the obtained precipitate product for 5 times by using alcohol, and then drying in an oven at the temperature of 40 ℃ to obtain the AuPd/ZnO nano material.
The AuPd/ZnO material prepared in the embodiment is used for carrying out a catalytic degradation experiment on rhodamine B with the concentration of 0.01 millimole/liter, the rhodamine B can be completely degraded within 10.5 minutes, and the AuPd/ZnO material has excellent degradation efficiency.
Comparative example 1
Preparation of ZnO nano material
Firstly, adding 14 ml of deionized water into 80 ml of ethylene glycol solution, and uniformly stirring to obtain a mixed solution of ethylene glycol and water; and then under the condition of rapid stirring, adding 1 ml of 5 mol/L zinc chloride aqueous solution and 5 ml of 5 mol/L sodium hydroxide aqueous solution into the mixed solution of ethylene glycol and water to obtain a precursor solution for preparing the zinc oxide nano material, wherein the volume of ethylene glycol in a reaction system accounts for 80 percent of the total volume of water and ethylene glycol, fully stirring for 1 hour at room temperature, centrifuging at the rotation speed of 10000 r/min, removing colorless supernatant in a centrifuge tube to obtain a white precipitate product, ultrasonically cleaning the obtained precipitate product for 3 times by using alcohol, and then drying in a 30 ℃ oven to obtain the ZnO nano material shown in figure 3 a.
Comparative example 2
Preparation of Au/ZnO composite nano material
Firstly, adding 14 ml of deionized water into 80 ml of ethylene glycol solution, and uniformly stirring to obtain a mixed solution of ethylene glycol and water; then under the condition of rapid stirring, adding 1 ml of 5 mol/L zinc chloride aqueous solution and 40.7 microliters of 0.1 mol/L chloroauric acid solution into the mixed solution of ethylene glycol and water, stirring for 30 minutes, and then rapidly adding 5 ml of 5 mol/L sodium hydroxide aqueous solution into the solution, wherein after the volume of ethylene glycol in the reaction system accounts for 80 percent of the total volume of the water and the ethylene glycol and fully stirring for 1 hour at room temperature, the solution gradually turns into dark brown, centrifuging at the rotating speed of 10000 r/min, removing colorless supernatant in a centrifuge tube to obtain a dark brown precipitate product, ultrasonically cleaning the obtained precipitate product for 3 times by using alcohol, and then drying in an oven at 30 ℃ to obtain the Au/ZnO composite nano material shown in figure 3 b.
Comparative example 3
Preparation of Pd/ZnO composite nano material
Firstly, adding 14 ml of deionized water into 80 ml of ethylene glycol solution, and uniformly stirring to obtain a mixed solution of ethylene glycol and water; then under the condition of rapid stirring, adding 1 ml of 5 mol/L zinc chloride aqueous solution and 75 microliters of 0.1 mol/L sodium chloropalladate solution into the mixed solution of ethylene glycol and water, stirring for 1 hour, then rapidly adding 5 ml of 5 mol/L sodium hydroxide aqueous solution into the solution, wherein the volume of ethylene glycol in the reaction system accounts for 80 percent of the total volume of the water and the ethylene glycol, after rapid stirring for 1 hour, the solution gradually changes into gray color, centrifuging at the rotating speed of 10000 r/min, removing colorless supernatant in a centrifuge tube to obtain a gray precipitation product, ultrasonically cleaning the obtained precipitation product for 3 times by using alcohol, and then drying in an oven at 30 ℃ to obtain the Pd/ZnO heterogeneous composite nano material shown in figure 3 c.
As can be seen from the optical photograph in fig. 1, the ZnO nanomaterial powder is white, and the AuPd/ZnO nanomaterial powder is dark brown, which indicates that the gold-palladium alloy nanoparticles are supported on the zinc oxide nanomaterial particles.
As can be seen from the Transmission Electron Microscope (TEM) photographs of fig. 2 and 3, the AuPd alloy nanoparticles, Au nanoparticles, and Pd nanoparticles have diameters of about 2 to 5 nm.
As can be seen from EDS-mapping of fig. 4, the Au element and the Pd element are uniformly dispersed throughout the ZnO nanoparticles.
As can be seen from fig. 5, the actual and theoretical contents of the gold palladium element tested by the inductively coupled plasma mass spectrometer are substantially in agreement, but the actual loading of the gold palladium element is slightly lower than the theoretical loading due to the multiple washing ultrasounds of the sample.
As can be seen from the X-ray diffraction (XRD) pattern of fig. 6, only the diffraction peak of the ZnO material was shown in the XRD diffraction pattern due to the very low noble metal loading, while no diffraction peak was detected in Au, Pd, and AuPd alloys.
As can be seen from the diffuse reflection spectra of the ZnO, Au/ZnO, Pd/ZnO and AuPd/ZnO powder materials UV-Vis in FIG. 7, the Au/ZnO and AuPd/ZnO samples both show strong absorption in the range of 400-900nm compared with pure ZnO and Pb/ZnO, which is caused by the SPR effect of the Au nanoparticles. Therefore, the modification of the Au nanoparticles can significantly improve the solar light absorption performance of the sample.
It can be seen from the PL emission spectra of the ZnO, Au/ZnO, Pd/ZnO, and AuPd/ZnO powder materials of fig. 8 that thermal electrons generated by the gold nanoparticles can be rapidly conducted to the surface of the palladium nanoparticles with the palladium nanoparticles, thereby further prolonging the recombination time of electron holes, and on the other hand, due to the synergistic effect between the two metals, the fluorescence emission intensity of the AuPd/ZnO material is further reduced, the recombination of holes and electrons is reduced, which also greatly improves the utilization efficiency of the prepared AuPd/ZnO sample to sunlight.
From the experimental result of the AuPd/ZnO material in FIG. 9 on the catalytic degradation of rhodamine B with the concentration of 0.01 mmol/L, it can be seen that the AuPd/ZnO material can completely degrade rhodamine B within 10 minutes, and has excellent degradation efficiency.
From the experimental results of the AuPd/ZnO material in FIG. 10 on rhodamine B with the concentration of 0.01 mmol/L for 5 cycles, it can be seen that the prepared AuPd/ZnO material has stable catalytic degradation performance under the condition of simulating solar illumination and can be recycled.
From the experimental results of the catalytic degradation of the ZnO, Au/ZnO, Pd/ZnO and AuPd/ZnO materials with the concentration of 0.01 millimole/liter rhodamine B in the graph of FIG. 11, it can be seen that the AuPd/ZnO materials have more excellent photocatalytic performance compared with the ZnO, Au/ZnO and Pd/ZnO materials.
It is seen from the schematic diagram of the photocatalytic mechanism of degrading rhodamine B under simulated sunlight irradiation by AuPd/ZnO in FIG. 12 that: when a metal is in contact with a semiconductor, the fermi level will inevitably reach equilibrium by interfacial charge transfer. Since ZnO has a different work function from Au and Pd, two schottky barriers (Au — ZnO and Pd — ZnO) can be generated by forming Au — ZnO and Pd — ZnO interfaces. Under the irradiation of visible light, generated hot electrons can be injected into a conduction band of ZnO due to the surface plasmon resonance of Au nanoparticles, which will significantly increase the number of photogenerated carriers in ZnO. Meanwhile, the generated photogenerated carriers can be captured by the Schottky barrier of Pd-ZnO. O with separated electrons and holes respectively adsorbed by surfaces2And H2Capture of O to produce-O2-and-OH radicals, both of which are effective in degrading organic contaminants.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A preparation method of an AuPd/ZnO nano material is characterized by comprising the following steps:
(1) respectively preparing zinc chloride aqueous solution, sodium hydroxide aqueous solution, chloroauric acid aqueous solution and sodium chloropalladate aqueous solution with certain concentration and mixed solution of glycol and water;
(2) under the condition of stirring at room temperature, adding the zinc chloride aqueous solution, the chloroauric acid aqueous solution and the sodium chloropalladate aqueous solution prepared in the step (1) into a mixed solution of ethylene glycol and water, after uniform mixing, quickly adding the sodium hydroxide aqueous solution prepared in the step (1) into the solution, gradually changing the color of the solution into black brown, and after centrifugation, removing colorless supernatant in a centrifugal tube to obtain a black brown precipitate product; wherein the loading of gold is about 0.15 wt% and the loading of palladium is about 0.05 wt%;
(3) and (3) ultrasonically centrifuging and cleaning the black brown precipitate obtained in the step (2) by using alcohol, and drying to obtain the ZnO nano material powder modified by the AuPd alloy.
2. The process according to claim 1, wherein the loading of gold is 0.15% by weight and the loading of palladium is 0.05% by weight, and wherein the loading is the ratio of the mass of gold or palladium to the mass of zinc oxide support.
3. The process according to claim 1, wherein in the step (1), the concentrations of the aqueous solutions of zinc chloride, sodium hydroxide, chloroauric acid and sodium chloropalladate are 1.0 to 5.0 mol/l, 2.0 to 10.0 mol/l, 0.1 to 0.5 mol/l and 0.1 to 0.5 mol/l, respectively.
4. The process according to claim 1, wherein the volume of ethylene glycol in the reaction system is 80% of the total volume of water and ethylene glycol.
5. The process according to claim 1, wherein in the step (2), the stirring time is 0.5 to 3 hours, and the centrifugal rotation speed is 8000-.
6. The method according to claim 1, wherein in the step (3), the ultrasonic cleaning is performed 3 to 5 times and the drying temperature is 25 to 60 ℃.
7. The AuPd/ZnO nano-material prepared by the method of any one of claims 1 to 6.
8. Use of the AuPd/ZnO nanomaterial of claim 7 or the preparation method of any one of claims 1-6 in the field of photocatalysis.
9. The use according to claim 8, wherein the use is in photocatalytic pollutant degradation, environmental remediation.
10. Use according to claim 9, wherein the contaminant is rhodamine B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110032820.9A CN112675844A (en) | 2021-01-11 | 2021-01-11 | Low-load AuPd modified ZnO nano material and preparation and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110032820.9A CN112675844A (en) | 2021-01-11 | 2021-01-11 | Low-load AuPd modified ZnO nano material and preparation and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112675844A true CN112675844A (en) | 2021-04-20 |
Family
ID=75457325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110032820.9A Pending CN112675844A (en) | 2021-01-11 | 2021-01-11 | Low-load AuPd modified ZnO nano material and preparation and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112675844A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113499773A (en) * | 2021-07-08 | 2021-10-15 | 辽宁大学 | Nano enzyme of nano zinc oxide supported palladium nanoparticles and preparation method and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10337477A (en) * | 1997-06-09 | 1998-12-22 | Inax Corp | Product having photocatalystic performance and production thereof |
| CN105797720A (en) * | 2016-05-16 | 2016-07-27 | 北京化工大学 | Superfine supported noble metal catalyst prepared through in-situ reduction deposition method and preparing method thereof |
| CN108262041A (en) * | 2018-02-27 | 2018-07-10 | 济南大学 | A kind of one pot of method for preparing high activity gold/zinc oxide compound nano cluster of room temperature |
-
2021
- 2021-01-11 CN CN202110032820.9A patent/CN112675844A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10337477A (en) * | 1997-06-09 | 1998-12-22 | Inax Corp | Product having photocatalystic performance and production thereof |
| CN105797720A (en) * | 2016-05-16 | 2016-07-27 | 北京化工大学 | Superfine supported noble metal catalyst prepared through in-situ reduction deposition method and preparing method thereof |
| CN108262041A (en) * | 2018-02-27 | 2018-07-10 | 济南大学 | A kind of one pot of method for preparing high activity gold/zinc oxide compound nano cluster of room temperature |
Non-Patent Citations (1)
| Title |
|---|
| YAN LU ET AL.: "Synthesis of novel AuPd nanoparticles decorated one-dimensional ZnO nanorod arrays with enhanced photoelectrochemical water splitting activity", 《COLLOID AND INTERFACE SCIENCE》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113499773A (en) * | 2021-07-08 | 2021-10-15 | 辽宁大学 | Nano enzyme of nano zinc oxide supported palladium nanoparticles and preparation method and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhang et al. | Core-shell Ag@ nitrogen-doped carbon quantum dots modified BiVO4 nanosheets with enhanced photocatalytic performance under Vis-NIR light: Synergism of molecular oxygen activation and surface plasmon resonance | |
| Jiang et al. | Novel ternary BiOI/g-C3N4/CeO2 catalysts for enhanced photocatalytic degradation of tetracycline under visible-light radiation via double charge transfer process | |
| Xu et al. | Visible-light-driven Ag/AgBr/ZnFe2O4 composites with excellent photocatalytic activity for E. coli disinfection and organic pollutant degradation | |
| Wang et al. | Controllable assembly of well-defined monodisperse Au nanoparticles on hierarchical ZnO microspheres for enhanced visible-light-driven photocatalytic and antibacterial activity | |
| Zhang et al. | Enhanced piezo/solar-photocatalytic activity of Ag/ZnO nanotetrapods arising from the coupling of surface plasmon resonance and piezophototronic effect | |
| CN102350346B (en) | Preparation method of visible light catalyst with surface plasmon effect and application thereof | |
| CN105126868B (en) | High-activity visible light catalyst Ag/Cu2O hierarchy method for preparing microsphere | |
| You et al. | Preparation, visible light-driven photocatalytic activity, and mechanism of multiphase CdS/C3N4 inorganic-organic hybrid heterojunction | |
| Ni et al. | Facile construction of 3D hierarchical flower-like Ag2WO4/Bi2WO6 Z-scheme heterojunction photocatalyst with enhanced visible light photocatalytic activity | |
| Bi et al. | Preparation of flower-like ZnO photocatalyst with oxygen vacancy to enhance the photocatalytic degradation of methyl orange | |
| CN110918095A (en) | Carbon/titanium dioxide/noble metal composite material, photocatalyst and preparation method thereof | |
| CN108654607B (en) | Preparation method of silver nanoparticle/carbon/titanium dioxide nano composite with core-shell structure | |
| CN105478117A (en) | Gold@zinc oxide core-shell heterogeneous nanoparticles having strong sunlight absorption property, and preparation method thereof | |
| CN108262041B (en) | Method for preparing high-activity gold/zinc oxide composite nano-cluster at room temperature in one pot | |
| Liu et al. | Construction of ternary hollow TiO2-ZnS@ ZnO heterostructure with enhanced visible-light photoactivity | |
| Liu et al. | Ni2P/ZnS (CdS) core/shell composites with their photocatalytic performance | |
| Zhang et al. | Electrostatic self-assembly of 2D/2D Bi2WO6/ZnIn2S4 heterojunction with enhanced photocatalytic degradation of tetracycline hydrochloride | |
| Chen et al. | Facile synthesis of AgBr@ ZIF-8 hybrid photocatalysts for degradation of Rhodamine B | |
| CN112675844A (en) | Low-load AuPd modified ZnO nano material and preparation and application thereof | |
| US11896960B1 (en) | High-efficiency visible-light catalytic material and preparation method and application thereof | |
| CN113522320A (en) | Ellipsoidal bismuth oxyhalide photocatalyst and preparation method and application thereof | |
| CN108514885A (en) | A kind of Cu（Ⅱ）The preparation method and applications of the BiOCl of modification | |
| CN108722394B (en) | WO having a yolk-eggshell structure3-TiO2Nanocomposite and method for preparing same | |
| CN103041772A (en) | One-dimensional zinc oxide/graphitized carbon core-shell structure hetero-junction and preparation method thereof | |
| Cui et al. | Boosting photoelectrochemical and photocatalytic performances of electronspun WO3 nanofibers by combining with biphase-Ag2WO4 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |