Method for rapidly preparing barium titanate / carbon black piezoelectric catalytic material based on electromagnetic induction heating and application of barium titanate / carbon black piezoelectric catalytic material

Abstract

The invention discloses a second-level ultrafast preparation method of a barium titanate (BaTiO3) / carbon black composite piezoelectric catalytic material, which overcomes the problems of complexity and high cost in the traditional method by combining ultrasonic treatment, rotary evaporation and magnetic induction heating. The method is simple to operate and short in preparation time, and the efficient barium titanate (BaTiO3) / carbon black composite piezoelectric catalytic material can be prepared in a short time. Meanwhile, the material has excellent catalytic performance and stability and can be widely applied to the fields of electro-catalysis hydrogen evolution reaction, water treatment and the like.

Description

Technical Field

[0001] The present invention relates to a method for rapidly synthesizing barium titanate (BaTiO3) / carbon black composite piezoelectric catalytic materials and their application in the degradation of organic pollutants, in particular to a method for rapidly preparing barium titanate / carbon black composite materials by magnetic induction heating technology and their application in the field of environmental governance, belonging to the technical field of environmental engineering.

Background Art

[0002] In recent years, the discharge of organic pollutants in water bodies has become a major environmental issue of global concern. Traditional physical, chemical, and biological treatment methods are difficult to effectively remove refractory organic pollutants, so it is imperative to develop new and efficient treatment technologies. As an emerging environmental governance technology, piezoelectric catalysis technology has received extensive attention due to its high efficiency and environmental friendliness.

[0003] Barium titanate (BaTiO3) is a typical piezoelectric material with excellent piezoelectric properties and chemical stability, and is widely used in the catalytic field. However, its small specific surface area and insufficient active sites limit the further improvement of its catalytic performance. Carbon black, due to its high conductivity and large specific surface area, can significantly enhance the catalytic performance of the composite material. The present invention proposes a rapid synthesis method based on electromagnetic induction heating, which composites barium titanate and carbon black to prepare a piezoelectric catalytic material, and verifies its superior performance in the degradation of organic pollutants.

Summary of the Invention

[0004] [Technical Problems to be Solved]

[0005] The purpose of the present invention is to provide a method for rapidly preparing barium titanate / carbon black piezoelectric catalytic materials based on electromagnetic induction heating and their application in the degradation of organic pollutants in water. Through this method, highly efficient barium titanate / carbon black composite materials can be synthesized in a short time, with simple operation and low cost, and are suitable for large-scale production.

[0006] [Technical Solutions]

[0007] A method for rapidly preparing barium titanate / carbon black piezoelectric catalytic materials based on electromagnetic induction heating and their application, characterized in that a method for rapidly preparing barium titanate / carbon black piezoelectric catalytic materials based on electromagnetic induction heating, comprising the following steps:

[0008] (1) Weigh 5 mL of tetrabutyl titanate (Ti(OBu)4) and add it to 100 mL of absolute ethanol, and stir well to form a uniform solution A.

[0009] (2) Separately, dissolve 2 g of barium nitrate (Ba(NO3)2) in 50 mL of deionized water to form solution B.

[0010] (3) Add solution B dropwise to solution A while keeping stirring, and control the pH value around 10 during the process (adjust by adding ammonia water).

[0011] (4) After the reaction is completed, centrifuge and wash the obtained white precipitate three times, and then dry it at 80 °C for 12 hours to obtain the barium titanate precursor.

[0012] (5) Calcinate the precursor in an air atmosphere at 800 °C for 2 hours to obtain barium titanate powder.

[0013] (6) Weigh 90 mg of the calcined barium titanate powder and 10 mg of carbon black (particle size 10 nm to 50 nm), and mix them evenly.

[0014] (7) Add 10 mL of absolute ethanol to the mixture as a dispersion medium.

[0015] (8) Use an ultrasonic processor (frequency 40 kHz, power 200 W) to process the mixture for 30 minutes to ensure that the barium titanate and carbon black are fully mixed and evenly dispersed.

[0016] (9) Uniformly coat the mixture on an iron sheet with a size of 2.5 cm × 2.5 cm × 0.2 mm and a surface covered with 0.01 mm graphite paper.

[0017] (10) Place the iron sheet on the refractory brick of the quartz tube, and purge it with high-purity argon (flow rate 100 mL / min) for 10 minutes.

[0018] (11) In a multi-turn induction coil with a diameter of 5 cm, set the induction current to 500 A and perform magnetic induction heating for 10 seconds.

[0019] (12) After heating, naturally cool it in an inert atmosphere, collect the obtained material, wash it three times with ethanol and deionized water, and then dry it for standby.

[0020] [Beneficial effects]

[0021] The method for preparing the barium titanate / carbon black composite material provided by the present invention is rapid and efficient, and the carbon black loading ratio can be flexibly adjusted according to requirements. The obtained material shows significant degradation performance in water pollution treatment and has excellent treatment effects on refractory organic pollutants. The material can be reused, has good stability and application prospects, and is suitable for actual water pollution treatment.

Description of the drawings

[0022] Figure 1 : Showing the TEM image of the barium titanate / carbon black piezoelectric catalytic material prepared after Example 1

[0023] Figure 2: The effect diagram after 5 cycles of the barium titanate / carbon black piezoelectric catalytic material prepared after Example 2 is shown, demonstrating its application potential in water treatment.

Specific Embodiments

[0024] Example 1:

[0025] (1) Weigh 5 mL of tetrabutyl titanate (Ti(OBu)4) and add it to 100 mL of absolute ethanol, and stir well to form a uniform solution A.

[0026] (2) Take another 2 g of barium nitrate (Ba(NO3)2) and dissolve it in 50 mL of deionized water to form solution B.

[0027] (3) Slowly add solution B drop by drop to solution A while keeping stirring, and control the pH value at about 10 during the process (adjusted by adding ammonia water).

[0028] (4) After the reaction is completed, centrifuge and wash the obtained white precipitate three times, and then dry it at 80 °C for 12 hours to obtain the barium titanate precursor.

[0029] (5) Calcinate the precursor in an air atmosphere at 800 °C for 2 hours to obtain barium titanate powder.

[0030] (6) Weigh 90 mg of the calcined barium titanate powder and 10 mg of carbon black (particle size 10 nm to 50 nm), and mix them evenly.

[0031] (7) Add 10 mL of absolute ethanol to the mixture as a dispersion medium.

[0032] (8) Use an ultrasonic processor (frequency 40 kHz, power 200 W) to process the mixture for 30 minutes to ensure that barium titanate and carbon black are fully mixed and evenly dispersed.

[0033] (9) Uniformly coat the mixture on an iron sheet with a size of 2.5 cm × 2.5 cm × 0.2 mm and a surface covered with 0.01 mm graphite paper.

[0034] (10) Place the iron sheet on the refractory brick of the quartz tube and purge it with high-purity argon (flow rate 100 mL / min) for 10 minutes.

[0035] (11) In a multi-turn induction coil with a diameter of 5 cm, set the induction current to 500 A and perform magnetic induction heating for 10 seconds.

[0036] (12) After heating, naturally cool it in an inert atmosphere, collect the obtained material, wash it three times with ethanol and deionized water, and then dry it for standby.

[0037] (13) The TEM image of the barium titanate / carbon black composite material is shown inFigure 1 .

[0038] (14) Prepare 100 mL of a rhodamine B (RhB) solution with a concentration of 10 mg / L, and add 20 mg of the barium titanate / carbon black composite material prepared above.

[0039] (15) Use an ultrasonic device (frequency 40 kHz, power 200 W) for mechanical energy excitation while maintaining solution stirring (500 rpm).

[0040] (16) Use an ultraviolet-visible spectrophotometer to measure the absorbance of the solution at 554 nm every 5 minutes, and record the concentration change during the degradation process.

[0041] Calculate the degradation rate according to the following formula:

[0042] η = (1 - C t / C0) × 100%

[0043] where C0 is the initial concentration, and C t is the concentration at the reaction time t.

[0044] Example 2:

[0045] (1) Weigh 5 mL of tetrabutyl titanate (Ti(OBu)4) and add it to 100 mL of absolute ethanol, and stir well to form a uniform solution A.

[0046] (2) Take another 2 g of barium nitrate (Ba(NO3)2) and dissolve it in 50 mL of deionized water to form solution B.

[0047] (3) Slowly add solution B dropwise to solution A while stirring, and control the pH value at about 10 during the process (adjusted by adding ammonia water).

[0048] (4) After the reaction is completed, centrifuge and wash the obtained white precipitate three times, and then dry it at 80 °C for 12 hours to obtain a barium titanate precursor.

[0049] (5) Calcinate the precursor in an air atmosphere at 800 °C for 2 hours to obtain barium titanate powder.

[0050] (6) Weigh 80 mg of the calcined barium titanate powder and 20 mg of carbon black (particle size 10 nm to 50 nm), and mix them evenly.

[0051] (7) Add 10 mL of absolute ethanol to the mixture as a dispersion medium.

[0052] (8) Use an ultrasonic processor (frequency 40 kHz, power 200 W) to process the mixture for 30 minutes to ensure that the barium titanate and carbon black are fully mixed and evenly dispersed.

[0053] (9) The mixture was evenly coated on an iron sheet with a size of 2.5 cm × 2.5 cm × 0.2 mm and a surface covered with 0.01 mm graphite paper.

[0054] (10) The iron sheet was placed on the refractory brick in the quartz tube and purged with high-purity argon (flow rate 100 mL / min) for 10 minutes.

[0055] (11) In a multi-turn induction coil with a diameter of 5 cm, an induction current of 500 A was set and magnetic induction heating was carried out for 10 seconds.

[0056] (12) After heating, it was naturally cooled in an inert atmosphere, the obtained material was collected, washed three times with ethanol and deionized water, and then dried for standby.

[0057] (13) Prepare 100 mL of rhodamine B solution with a concentration of 10 mg / L and add 20 mg of the above-prepared barium titanate / carbon black composite material.

[0058] (14) Use an ultrasonic device to carry out mechanical energy excitation and stir (500 rpm) simultaneously to promote the mixing of the solution.

[0059] (15) After the experiment, the material was recovered by filtration and washed clean with deionized water.

[0060] (16) Repeat the above experiment five times and record the degradation efficiency each time.

[0061] (17) When used for the first time, the degradation rate of the material to rhodamine B reached 95%.

[0062] (18) As Figure 2 shown, after five cycles, the degradation efficiency remained above 85%, indicating that the material has excellent stability.

Claims

1. A method for rapidly preparing barium titanate / carbon black piezoelectric catalytic material based on electromagnetic induction heating and its application, characterized in that A method for rapidly preparing barium titanate / carbon black piezoelectric catalytic material based on electromagnetic induction heating comprises the following steps: (1) Weigh 5 mL of tetrabutyl titanate (Ti(OBu)4), add it to 100 mL of anhydrous ethanol, and stir thoroughly to form a uniform solution A. (2) Take another 2 g of barium nitrate (Ba(NO3)2) and dissolve it in 50 mL of deionized water to form solution B. (3) Add solution B dropwise into solution A while stirring. During the process, the pH value is controlled at about 10 (adjusted by adding ammonia water). (4) After the reaction was completed, the obtained white precipitate was centrifuged and washed three times, and then dried at 80° C. for 12 hours to obtain a barium titanate precursor. (5) The precursor was calcined at 800° C. for 2 hours in an air atmosphere to obtain barium titanate powder. (6) Weigh 90 mg of calcined barium titanate powder and 10 mg of carbon black (particle size 10 nm to 50 nm), and mix them evenly. (7) Add 10 mL of anhydrous ethanol to the mixture as a dispersion medium. (8) The mixture was treated with an ultrasonic processor (frequency 40 kHz, power 200 W) for 30 minutes to ensure that the barium titanate and carbon black were fully mixed and evenly dispersed. (9) The mixture was evenly coated on an iron sheet with a size of 2.5 cm × 2.5 cm × 0.2 mm and the surface was covered with 0.01 mm graphite paper. (10) Place the iron sheet on the refractory brick of the quartz tube and purge it with high-purity argon gas for 10 minutes. (11) In a multi-turn induction coil with a diameter of 5 cm, the induction current is set to 500 A and magnetic induction heating is performed for 10 seconds. (12) After heating, the mixture was naturally cooled in an inert atmosphere, and the obtained material was collected, washed three times with ethanol and deionized water, and dried for later use. 2 . The method according to claim 1 , wherein the conductivity of the graphite paper is 10 S / cm to 1000 S / cm. The method according to claim 1 , wherein the gas flow rate of the argon gas is 50 mL / min to 500 mL / min.

4. The method according to claim 1, wherein the frequency of the magnetic induction heating is 50 kHz to 1 MHz, the time of the magnetic induction heating is 10 seconds, and the power of the induction coil is 1 kW to 10 kW.

5. The method according to claim 1, wherein the surface of the iron sheet is pretreated to improve the adhesion of the graphite paper.

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