High-performance lead-free piezoelectric catalytic material as well as preparation method and application thereof

Abstract

The invention discloses a high-performance lead-free piezoelectric catalytic material and a preparation method and application thereof, and belongs to the field of catalytic materials and pollution abatement, the preparation method of the lead-free piezoelectric catalytic material comprises the following steps: weighing K2CO3, Na2CO3, Nb2O5, Fe2O3 and Co2O3, mixing, performing ultrasonic dispersion treatment, and then performing grinding and presintering treatment to obtain precursor powder; grinding the precursor powder again, and then tabletting to obtain a green body; the green body is subjected to sintering treatment and grinding treatment in sequence, and ceramic powder is obtained; the ceramic powder is placed in pure water for ultrasonic treatment, then drying treatment is conducted, and the lead-free piezoelectric catalytic material is obtained. The potassium-sodium niobate-based lead-free piezoelectric catalytic material prepared through the processes of compact sintering, grinding, pure water ultrasonic treatment and the like has extremely high spontaneous polarization, has a very obvious effect on piezoelectric catalytic degradation of rhodamine B, and has the advantages of being environmentally friendly, efficient, high in catalytic activity, safe, stable, capable of reacting at normal temperature and the like.

Description

Technical Field

[0001] The present invention relates to the fields of catalytic materials and pollution control, and particularly to a high-performance lead-free piezoelectric catalytic material, a preparation method thereof, and an application thereof. Background Technique

[0002] With the continuous advancement of the social industrialization process, the treatment of industrial wastewater has become one of the extremely severe challenges faced by our country at present. According to statistics, the annual discharge of industrial wastewater in our country is as high as hundreds of billions of tons. Among them, industries such as textile, printing, and pharmaceutical, as major wastewater emitters, have a non-negligible proportion of emissions. In these industries, how to achieve the efficient degradation and treatment of industrial wastewater is becoming the core hot issue in the current research in related fields.

[0003] The research on the catalytic performance of piezoelectric materials is a newly emerging research field in recent years. Traditional energy conversion and environmental remediation technologies have problems such as low efficiency, high cost, and secondary pollution. Therefore, it is necessary to develop a new technology that is efficient, clean, and sustainable to solve these problems. Piezoelectric catalysis technology can convert mechanical energy into chemical energy, achieve efficient energy conversion and utilization, and at the same time can also be used for environmental remediation to degrade organic pollutants, with broad application prospects.

[0004] Traditional piezoelectric material processing methods, such as the commonly used solid-phase sintering method, etc., show obvious shortcomings when dealing with increasingly complex and stringent application requirements. Such traditional processes are unable to finely control the microstructure and properties of materials, resulting in significant unevenness in key indicators such as piezoelectric characteristics, stability, and consistency of the produced piezoelectric materials, and it has always been difficult to improve the qualified rate and excellent rate of products. In the process of preparing piezoelectric ceramic catalytic materials using the traditional solid-phase sintering process, problems such as interlayer bonding defects and internal stress imbalance are frequently encountered, ultimately resulting in limitations in the energy conversion efficiency and long-term stability of products. In the preparation of the perovskite-type piezoelectric material sodium potassium bismuth titanate, the originally long reaction time was significantly reduced, significantly improving the production efficiency, providing a very promising green synthesis strategy for the large-scale industrial production of piezoelectric materials. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-performance lead-free piezoelectric catalytic material to solve the problems mentioned in the above background technique.

[0006] To achieve the above purpose, the embodiments of the present invention provide the following technical solutions: A preparation method of a high-performance lead-free piezoelectric catalytic material, which includes the following steps: Weigh K2CO3, Na2CO3, Nb2O5, Fe2O3, Co2O3, mix them, perform ultrasonic dispersion treatment, and then perform grinding and pre-burning treatment to obtain a precursor powder; The precursor powder is ground again, and then tableted to obtain a green body; The green body is sintered and crushed in sequence to obtain ceramic powder; The ceramic powder is placed in pure water for ultrasonic treatment, and then dried to obtain the lead-free piezoelectric catalytic material.

[0007] Preferably, according to the chemical formula (K 0.52 Na 0.48 )[Nb 0.985 (Fe 0.0075 Co 0.0075 )]O3 (KNNFC15), corresponding masses of K2CO3, Na2CO3, Nb2O5, Fe2O3, and Co2O3 are weighed.

[0008] Preferably, the pressure used during tableting is 15 - 25 MPa.

[0009] Preferably, the sintering treatment method is: the green body is sintered at a temperature of 1050 - 1150 °C for 4 - 6 min, then cooled at a cooling rate of 10 °C / min to 750 - 850 °C and annealed for 2 - 4 h to obtain a ceramic sheet.

[0010] Preferably, the crushing treatment method is: the two sides of the ceramic sheet are polished and ground, cleaned, and then crushed to obtain ceramic powder.

[0011] Preferably, in the step of placing the ceramic powder in pure water for ultrasonic treatment, the ultrasonic power is 350 - 450 W, the ultrasonic frequency is 35 - 45 kHz, and the treatment time is 2 - 4 h.

[0012] Preferably, the drying temperature is 100 - 110 °C.

[0013] Another object of the present invention is to provide a high-performance lead-free piezoelectric catalytic material prepared by the above preparation method.

[0014] Another object of the present invention is to provide an application of the above high-performance lead-free piezoelectric catalytic material in degrading organic pollutants, and the organic pollutants include Rhodamine B.

[0015] Preferably, the method for the lead-free piezoelectric catalytic material to degrade organic pollutants is: adding the lead-free piezoelectric catalytic material into a solution containing organic pollutants, stirring under dark conditions, and then performing ultrasonic vibration to drive the lead-free piezoelectric catalytic material to carry out catalytic degradation.

[0016] The lead-free piezoelectric catalytic material based on sodium potassium niobate (KNNFC) prepared by processes such as compact sintering, crushing and combined with ultrasonic treatment in pure water has extremely strong spontaneous polarization, and has a very obvious effect on the piezoelectric catalytic degradation of rhodamine B. It has the advantages of environmental protection and high efficiency, high catalytic activity, safety and stability, and reaction at room temperature. Before catalysis, the lead-free piezoelectric catalytic material is placed in pure water for ultrasonic treatment. During the ultrasonic action process of the sample, almost equal amounts of ions with different polarities in the pure water attach to both sides of the ferroelectric domain, which can thicken the domain wall and promote domain growth, thereby enhancing the piezoelectric catalytic performance and further improving the piezoelectric catalytic efficiency of the material and shortening the catalytic time. Without the premise of using electric field polarization, the degradation efficiency of rhodamine B can be improved. Brief Description of the Drawings

[0017] Figure 1 SEM images of the lead-free piezoelectric catalytic material prepared in the comparative example of the present invention; among them, a is the SEM image of KNNFC15c-US0; b is the SEM image of KNNFC15p-US0.

[0018] Figure 2 Degradation effect test diagrams of the lead-free piezoelectric catalytic materials prepared in the examples and comparative examples of the present invention in an aqueous solution of rhodamine B; among them, a-d are the degradation effect test diagrams of KNNFC15c-US0, KNNFC15c-US3, KNNFC15p-US0 and KNNFC15p-US3 respectively.

[0019] Figure 3 Comparison diagram of the test results of the degradation efficiency of the lead-free piezoelectric catalytic materials prepared in the examples and comparative examples of the present invention in an aqueous solution of rhodamine B after ultrasonic treatment in pure water for different times. Detailed Embodiments

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0021] Example 1: This example provides a preparation method of a high-performance lead-free piezoelectric catalytic material, which includes the following steps: S1. Add 2.8890 g of K2CO3, 2.0391 g of Na2CO3, 10.4740 g of Nb2O5, 0.0479 g of Fe2O3, and 0.0503 g of Co2O3 into a ball milling jar. Then add 2 / 3 of absolute ethanol into the ball milling jar and perform ultrasonic dispersion treatment for 30 min. Subsequently, ball mill the mixture at a rotation speed of 360 r / min for 24 h and then place it in an oven for drying. Place the dried sample in a mortar and hand mill it for 3 h to make each component fully mixed and uniform. Place the milled mixture in a crucible and pre-sinter it at 850 °C for 6 h to obtain a precursor powder; S2. Re-place the precursor powder into the ball milling jar, add 2 / 3 of absolute ethanol, ball mill it at a rotation speed of 360 r / min for 24 h and then dry it. Re-hand mill the dried sample until the particles are fine and then sieve it. Weigh 1.5 g of the sieved powder each time and use a tablet press to make a green body with a thickness of 1.5 mm. When pressing, use a compressive stress of 20 MPa and a pressure holding time of 10 minutes to obtain a green body; S3. Place the obtained green body on a crucible plate, cover it with a double crucible, set the heating and cooling rate of the muffle furnace to 5 °C / min. Place the green body sample in the muffle furnace and sinter it at 1090 °C for 5 min, then cool it at a cooling rate of 10 °C / min to 800 °C and then perform annealing treatment for 3 h to obtain a ceramic sheet. Polish both sides of the sintered ceramic sheet sample by 0.01 mm each and then clean it. Then grind and crush it into grains with a size of about 0.6 μm to obtain ceramic powder; S4. Place the ceramic powder in pure water and perform ultrasonic treatment for 3 h, with an ultrasonic power of 400 W and an ultrasonic frequency of 40 kHz. Then place it at a temperature of 105 °C for drying treatment to obtain a lead-free piezoelectric catalytic material, denoted as KNNFC15c-US3.

[0022] Example 2: This example provides a preparation method of a high-performance lead-free piezoelectric catalytic material, which includes the following steps: S1. Add 2.8890 g of K2CO3, 2.0391 g of Na2CO3, 10.4740 g of Nb2O5, 0.0479 g of Fe2O3, and 0.0503 g of Co2O3 into a ball milling jar. Then add 2 / 3 of absolute ethanol into the ball milling jar and perform ultrasonic dispersion treatment for 30 min. Subsequently, ball mill the mixture at a rotation speed of 360 r / min for 24 h and then place it in an oven for drying. Place the dried sample in a mortar and hand mill it for 3 h to make each component fully mixed and uniform. Place the milled mixture in a crucible and pre-sinter it at 850 °C for 6 h to obtain a precursor powder; S2. Re-put the precursor powder into the ball milling jar, add 2 / 3 of absolute ethanol, ball mill for 24 h at a rotation speed of 360 r / min, then dry it. Re-grind the dried sample by hand until the particles are fine and sieve it. Weigh 1.5 g of the sieved powder each time and use a tablet press to make a green compact with a thickness of 1.5 mm. Apply a compressive stress of 15 MPa during pressing and keep the pressure for 10 minutes to obtain the green compact; S3. Place the obtained green compact on the crucible plate, cover it with a double crucible, set the heating and cooling rate of the muffle furnace to 5 °C / min. Place the green compact sample in the muffle furnace, sinter at 1050 °C for 4 min, then cool to 750 °C at a cooling rate of 10 °C / min and perform annealing treatment for 2 h to obtain a ceramic sheet. Polish both sides of the sintered ceramic sheet sample by 0.01 mm each, then wash it, and then grind and crush it into grains of about 0.6 μm size to obtain ceramic powder; S4. Place the ceramic powder in pure water and perform ultrasonic treatment for 2 h with an ultrasonic power of 350 W and an ultrasonic frequency of 35 kHz. Then place it at a temperature of 100 °C for drying treatment to obtain the lead-free piezoelectric catalytic material.

[0023] Example 3: This example provides a preparation method of a high-performance lead-free piezoelectric catalytic material, which includes the following steps: S1. Add 2.8890 g of K2CO3, 2.0391 g of Na2CO3, 10.4740 g of Nb2O5, 0.0479 g of Fe2O3, and 0.0503 g of Co2O3 into the ball milling jar, add 2 / 3 of absolute ethanol to the ball milling jar, and then perform ultrasonic dispersion treatment for 30 min. Then ball mill the mixture for 24 h at a rotation speed of 360 r / min and place it in an oven for drying. Place the dried sample in a mortar and grind it by hand for 3 h to make each component fully mixed and uniform. Place the ground mixture in a crucible and pre-burn it at 850 °C for 6 h to obtain the precursor powder; S2. Re-put the precursor powder into the ball milling jar, add 2 / 3 of absolute ethanol, ball mill for 24 h at a rotation speed of 360 r / min, then dry it. Re-grind the dried sample by hand until the particles are fine and sieve it. Weigh 1.5 g of the sieved powder each time and use a tablet press to make a green compact with a thickness of 1.5 mm. Apply a compressive stress of 25 MPa during pressing and keep the pressure for 10 minutes to obtain the green compact; S3. Place the obtained green body on a crucible plate, cover it with a double crucible, set the heating and cooling rate of the muffle furnace to 5 °C / min, place the green body sample in the muffle furnace, sinter it at 1150 °C for 6 min, then cool it to 850 °C at a cooling rate of 10 °C / min and perform annealing treatment for 4 h to obtain a ceramic sheet. Grind and polish both sides of the sintered ceramic sheet sample by 0.01 mm each, then clean it, and then grind and crush it into grains of about 0.6 μm in size to obtain ceramic powder; S4. Place the ceramic powder in pure water and perform ultrasonic treatment for 4 h, with an ultrasonic power of 450 W and an ultrasonic frequency of 45 kHz. Then place it in an oven at a temperature of 110 °C for drying treatment to obtain a lead-free piezoelectric catalytic material.

[0024] Comparative Example 1: This comparative example provides a method for preparing a lead-free piezoelectric catalytic material, which includes the following steps: S1. Add 2.8890 g of K2CO3, 2.0391 g of Na2CO3, 10.4740 g of Nb2O5, 0.0479 g of Fe2O3, and 0.0503 g of Co2O3 into a ball milling tank, add 2 / 3 of anhydrous ethanol to the ball milling tank, and then perform ultrasonic dispersion treatment for 30 min. Then ball mill the mixture at a rotation speed of 360 r / min for 24 h and place it in an oven for drying. Place the dried sample in a mortar and hand mill it for 3 h to fully mix and homogenize each component. Place the milled mixture in a crucible and pre-burn it at 850 °C for 6 h to obtain a precursor powder; S2. Re-place the precursor powder in the ball milling tank, add 2 / 3 of anhydrous ethanol, ball mill it at a rotation speed of 360 r / min for 24 h and then dry it. Re-hand mill the dried sample until the particles are fine and sieve it. Weigh 1.5 g of the sieved powder each time and use a tablet press to make a green body with a thickness of 1.5 mm. When pressing, use a compressive stress of 20 MPa and a pressure holding time of 10 minutes to obtain a green body; S3. Place the obtained green body on a crucible plate, cover it with a double crucible, set the heating and cooling rate of the muffle furnace to 5 °C / min, place the green body sample in the muffle furnace, sinter it at 1090 °C for 5 min, then cool it to 800 °C at a cooling rate of 10 °C / min and perform annealing treatment for 3 h to obtain a ceramic sheet. Grind and polish both sides of the sintered ceramic sheet sample by 0.01 mm each, then clean it, and then grind and crush it into grains of about 0.6 μm in size to obtain ceramic powder; This ceramic powder is not subjected to ultrasonic treatment with pure water and is directly used as a lead-free piezoelectric catalytic material, denoted as KNNFC15c-US0.

[0025] The lead-free piezoelectric catalytic material KNNFC15c-US0 prepared in Comparative Example 1 was observed using a scanning electron microscope. It can be seen that the particle size of the milled powder is about 0.6 μm, and the result is as shown in Figure 1 a of

[0026] Comparative Example 2: This comparative example provides a method for preparing a lead-free piezoelectric catalytic material, which includes the following steps: S1. Add 2.8890 g of K2CO3, 2.0391 g of Na2CO3, 10.4740 g of Nb2O5, 0.0479 g of Fe2O3, and 0.0503 g of Co2O3 into a ball milling jar, and add 2 / 3 of anhydrous ethanol to the ball milling jar, then perform ultrasonic dispersion treatment for 30 min. Subsequently, the mixture is ball milled at a rotation speed of 360 r / min for 24 h and then placed in an oven for drying. The dried sample is hand milled in a mortar for 3 h to fully mix and homogenize each component. The milled mixture is placed in a crucible and pre-sintered at 850 °C for 6 h to obtain a precursor powder; S2. Re-place the precursor powder into the ball milling jar, add 2 / 3 of anhydrous ethanol, and then ball mill at a rotation speed of 360 r / min for 24 h and dry. The dried sample is hand milled again until the particles are fine and then sieved to obtain the sieved powder.

[0027] S3. Directly place the sieved powder into a crucible, set the heating and cooling rate of the muffle furnace to 5 °C / min, place the crucible in the muffle furnace, sinter at 1090 °C for 5 min, then cool at a cooling rate of 10 °C / min to 800 °C and perform annealing treatment for 3 h to obtain a ceramic powder; this ceramic powder is not subjected to pure water ultrasonic treatment and is directly used as a lead-free piezoelectric catalytic material, denoted as KNNFC15p-US0.

[0028] The lead-free piezoelectric catalytic material KNNFC15p-US0 prepared in Comparative Example 2 was observed using a scanning electron microscope, and the result is as shown in Figure 1 b of

[0029] Comparative Example 3: This comparative example provides a method for preparing a lead-free piezoelectric catalytic material, which includes the following steps: S1. Add 2.8890 g of K2CO3, 2.0391 g of Na2CO3, 10.4740 g of Nb2O5, 0.0479 g of Fe2O3, and 0.0503 g of Co2O3 into a ball milling jar. Then add 2 / 3 of anhydrous ethanol into the ball milling jar and perform ultrasonic dispersion treatment for 30 min. Subsequently, ball mill the mixture at a rotational speed of 360 r / min for 24 h and then place it in an oven for drying. Place the dried sample in a mortar and hand mill it for 3 h to make each component fully mixed and uniform. Place the milled mixture in a crucible and pre-sinter it at 850 °C for 6 h to obtain a precursor powder; S2. Re-place the precursor powder into the ball milling jar, add 2 / 3 of anhydrous ethanol, then ball mill it at a rotational speed of 360 r / min for 24 h and dry it. Re-hand mill the dried sample until the particles are fine and then sieve it to obtain the sieved powder.

[0030] S3. Place the sieved powder directly into a crucible, set the heating and cooling rate of the muffle furnace to 5 °C / min. Place the crucible in the muffle furnace and sinter it at 1090 °C for 5 min, then cool it to 800 °C at a cooling rate of 10 °C / min and perform annealing treatment for 3 h to obtain a ceramic powder; S4. Place the ceramic powder in pure water and perform ultrasonic treatment for 3 h with an ultrasonic power of 400 W and an ultrasonic frequency of 40 kHz. Then place it at a temperature of 105 °C for drying treatment to obtain a lead-free piezoelectric catalytic material, denoted as KNNFC15p-US3.

[0031] Performance test: Measure the degradation effect of the lead-free piezoelectric catalytic materials prepared in Example 1 and Comparative Examples 1-3 on the rhodamine B aqueous solution at room temperature. The specific implementation steps are as follows. First, take 0.08 g of each of the lead-free piezoelectric catalytic materials prepared in Example 1 and Comparative Examples 1-3 and add them into 50 mL of rhodamine B aqueous solution with a concentration of 5 mg / L respectively; then stir for 60 min under dark conditions at 30 °C; then drive the lead-free piezoelectric catalytic material to perform catalytic degradation through ultrasonic vibration with a power of 100 W and a frequency of 40 kHz. Every once in a while, collect 3 mL of the water dispersant, centrifuge to remove the catalyst particles, and analyze the concentration of the rhodamine B aqueous solution.

[0032] The test results of the degradation effect of the lead-free piezoelectric catalytic materials prepared in Example 1 and Comparative Examples 1-3 on the rhodamine B aqueous solution are as Figure 2As shown. It can be seen from the figure that all four catalysts have a catalytic degradation effect on Rhodamine B under ultrasonic vibration. And when the catalytic conditions are ultrasonic power of 100 W and ultrasonic frequency of 40 kHz, the finally recorded degradation efficiencies are 21%, 76%, 84% and 97% respectively. Among them, the actual catalytic efficiency of the catalytic material sample KNNFC15c-US3, which is made by pressing into a bulk sample, firing, grinding, and then performing ultrasonic treatment with pure water, is better than that of the catalytic materials KNNFC15c-US0, KNNFC15p-US0 without water ultrasonic treatment and the sample KNNFC15p-US3 directly made by powder firing and ultrasonic treatment with pure water. The catalytic material KNNFC15c-US3, which is made by pressing, firing, grinding, and then performing water treatment, has the best catalytic degradation efficiency for Rhodamine B, and the catalytic efficiency can reach 97%.

[0033] The improvement of the embodiment of the present invention is the firing method of the catalytic material and the introduction of a treatment method for the catalyst to act together to improve the catalytic performance of the KNNFC15 piezoelectric catalytic material. It has a very significant degradation effect on Rhodamine B. Especially, the catalytic performance of KNNFC15c-US3, which is made by pressing, firing, grinding and cleaning, and then performing ultrasonic treatment with pure water, is more excellent. As Figure 3 shown, when the ultrasonic power for piezoelectric catalysis test is 100 W and the ultrasonic frequency is 40 kHz, the degradation efficiency of the catalyst sample, which is made by pressing, firing, grinding and then performing ultrasonic treatment with pure water for 3 h, for Rhodamine B can reach 97% after 25 min. Compared with the catalysts obtained under other preparation conditions, a more efficient catalytic effect is obtained with a shorter catalytic time.

[0034] Based on the data obtained from the above examples, the factors for the excellent piezoelectric catalytic performance of the potassium sodium niobate-based piezoelectric catalytic material prepared in the embodiment of the present invention can be attributed to the following two points: one is that the KNNFC15c-US3 catalytic material prepared in the embodiment of the present invention itself has very excellent ferroelectric properties. After pressing, sintering and grinding under compressive stress, the proportion of single crystal grains is increased, and the overall spontaneous polarization is improved. The other is that after the catalytic material is ultrasonically treated in pure water, its spontaneous polarization effect is promoted. Generally speaking, pressing and sintering the precursor sample of the catalytic material and performing ultrasonic treatment with pure water on the sample ground into powder after firing can increase its spontaneous polarization and promote domain growth. The two act together, enabling the catalytic material to have a stronger catalytic efficiency without the premise of using electric field polarization. These two effects are the key to improving the piezoelectric catalytic performance of the KNNFC15c-US3 catalytic material by the present invention.

[0035] In summary, in the process of treating the KNNFC catalytic material, the embodiments of the present invention adopted compact sintering, and carried out surface layer polishing and crushing treatment on the fired ceramic chips. The obtained ceramic powder samples were ultrasonically treated with pure water, introducing a new method for treating the KNNFC catalytic material. The piezoelectric catalytic degradation of Rhodamine B was tested on the finally obtained catalytic material samples. It was found that the piezoelectric catalytic efficiency of the KNNFC catalytic material samples obtained by pressing, firing and then crushing was increased by 63% compared with the powder samples obtained by direct firing; the piezoelectric catalytic efficiency of the KNNFC catalytic material after ultrasonic treatment in pure water was increased by 55% compared with the samples without ultrasonic treatment in pure water. It is worth noting that the KNNFC catalytic material obtained by compact sintering, crushing, ultrasonic treatment in pure water and then drying has a RhB degradation efficiency as high as 97%, and the catalytic time only takes 25 minutes. This method is simple and easy to handle, can improve the piezoelectric catalytic efficiency of the KNNFC catalytic material while greatly shortening the catalytic time, and has many advantages such as no need for additional electric field polarization treatment and high piezoelectric catalytic activity compared with the original lead-free piezoelectric catalytic material treatment method.

[0036] Inspired by the ideal embodiments of the present invention described above, through the above description, relevant staff can make various changes and modifications completely within the scope of not deviating from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification.

Claims

1. A preparation method of a high-performance lead-free piezoelectric catalytic material, characterized in that, It includes the following steps: Weigh K2CO3, Na2CO3, Nb2O5, Fe2O3, and Co2O3, mix them, and then perform ultrasonic dispersion treatment. Subsequently, perform grinding and pre-sintering treatment to obtain precursor powder; Grind the precursor powder again, and then perform pressing to obtain a green body; Perform sintering treatment and crushing treatment on the green body in sequence to obtain ceramic powder; Place the ceramic powder in pure water for ultrasonic treatment, and then perform drying treatment to obtain the lead-free piezoelectric catalytic material.

2. The preparation method of the high-performance lead-free piezoelectric catalytic material according to claim 1, wherein, According to the chemical formula (K 0.52 Na 0.48 )[Nb 0.985 (Fe 0.0075 Co 0.0075 )]O3, weigh corresponding masses of K2CO3, Na2CO3, Nb2O5, Fe2O3, and Co2O3.

3. The preparation method of the high-performance lead-free piezoelectric catalytic material according to claim 1, characterized in that, The pressure used during pressing is 15 - 25 MPa.

4. The high-performance lead-free piezoelectric catalytic material according to claim 1, characterized in that, The method of sintering treatment is: Place the green body in a temperature range of 1050 - 1150 °C for sintering for 4 - 6 min, then cool it at a cooling rate of 10 °C / min to 750 - 850 °C and perform annealing treatment for 2 - 4 h to obtain a ceramic sheet.

5. The preparation method of the high-performance lead-free piezoelectric catalytic material according to claim 4, characterized in that, The method of crushing treatment is: Polish and grind both sides of the ceramic sheet, clean it, and then perform crushing to obtain ceramic powder.

6. The preparation method of the high-performance lead-free piezoelectric catalytic material according to claim 1, characterized in that In the step of placing the ceramic powder in pure water for ultrasonic treatment, the ultrasonic power is 350 - 450 W, the ultrasonic frequency is 35 - 45 kHz, and the treatment time is 2 - 4 h.

7. The preparation method of the high-performance lead-free piezoelectric catalytic material according to claim 1, characterized in that, The temperature of the drying treatment is 100 - 110 °C.

8. A high-performance lead-free piezoelectric catalytic material prepared by the preparation method described in any one of claims 1 - 7.

9. Use of a high-performance lead-free piezoelectric catalytic material as described in claim 8 in the degradation of organic pollutants, characterized in that, The organic pollutant includes Rhodamine B.

10. The application according to claim 9, characterized in that, The method for the lead-free piezoelectric catalytic material to degrade organic pollutants is: Add the lead-free piezoelectric catalytic material to a solution containing organic pollutants, place it under dark conditions for stirring, and then perform ultrasonic vibration to drive the lead-free piezoelectric catalytic material to carry out catalytic degradation.

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