Lamellar nanometer barium titanate and preparation method thereof, and applications in sewage treatment based on piezoelectric photocatalysis

A layered nano-barium titanate technology, applied in the direction of light water/sewage treatment, special compound water treatment, water/sludge/sewage treatment, etc., can solve the problem of reduced redox capacity, limited practical application, low separation efficiency, etc. problems, to achieve the effect of promoting separation, enhancing catalytic oxidation capacity, and wide application potential

Inactive Publication Date: 2019-11-19
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the photocatalytic reaction is affected by the low separation efficiency and high recombination rate of photogenerated carriers, resulting in reduced redox ability, which limits the practical application of photocatalysis to a certain extent.

Method used

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  • Lamellar nanometer barium titanate and preparation method thereof, and applications in sewage treatment based on piezoelectric photocatalysis
  • Lamellar nanometer barium titanate and preparation method thereof, and applications in sewage treatment based on piezoelectric photocatalysis
  • Lamellar nanometer barium titanate and preparation method thereof, and applications in sewage treatment based on piezoelectric photocatalysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Sol-gel synthesis of lamellar barium titanate (BTO), the steps are as follows:

[0045] 1) Wash the glass sheet with deionized water and ethanol alternately and repeatedly until there are no obvious impurities on the surface, put it in a vacuum drying oven, dry it, and seal it for later use;

[0046] 2) Weigh 15.35g of tetrabutyl titanate, dissolve it in 50mL of ethanol solution, put the 250mL beaker containing the mixed solution into a magnet, and put it in a magnetic stirrer for 2 hours until it is evenly mixed, and record it as liquid A;

[0047] 3) Dissolve 11.66g of barium acetate in 50mL of acetic acid solution (mixed with 15mL of glacial acetic acid and 35mL of deionized water), stir it with a glass rod for a period of time, and then place it in a water bath at 60°C (at a heating rate of 2°C / min. to 60°C), keep warm for 2 hours, and record it as liquid B;

[0048] 4) Slowly add liquid B to liquid A, then stir magnetically for 1 hour and then let it stand for agi...

Embodiment 2

[0051] Sol-gel synthesis of lamellar barium titanate (BTO), the steps are as follows:

[0052] 1) Wash the glass sheet with deionized water and ethanol alternately and repeatedly until there are no obvious impurities on the surface, put it in a vacuum drying oven, dry it, and seal it for later use;

[0053] 2) Weigh 10-15g of tetrabutyl titanate, dissolve it in 50mL of isopropanol solution, add a magnet to the 250mL beaker containing the mixed solution and put it in a magnetic stirrer for 3-6h until the mixture is evenly mixed. For liquid A;

[0054] 3) Dissolve 12-18g of barium carbonate in 50mL of acetic acid solution (mixed with 15mL of glacial acetic acid and 35mL of deionized water), stir with a glass rod for a period of time and place it in a water bath at 60°C (at a heating rate of 2°C / min rise to 60°C), keep warm for 2 hours, and record it as liquid B;

[0055] 4) Slowly add liquid B to liquid A, then stir magnetically for 1-2 hours, then let it stand for aging to ob...

Embodiment 3

[0058] Sol-gel synthesis of lamellar barium titanate (BTO), the steps are as follows:

[0059] 1) Wash the glass sheet with deionized water and ethanol alternately and repeatedly until there are no obvious impurities on the surface, put it in a vacuum drying oven, dry it, and seal it for later use;

[0060] 2) Weigh 10-15g of tetrabutyl titanate, dissolve it in 50mL of isopropanol solution, add a magnet to the 250mL beaker containing the mixed solution and put it in a magnetic stirrer for 3-6h until the mixture is evenly mixed. For liquid A;

[0061] 3) Dissolve 12-18g of barium acetate in 50mL of acetic acid solution (mixed with 15mL of glacial acetic acid and 35mL of deionized water), stir it with a glass rod for a period of time and place it in a 60°C water bath (at a heating rate of 2°C / min rise to 50°C), keep it warm for 2 hours, and record it as liquid B;

[0062] 4) Slowly add liquid B to liquid A, then stir magnetically for 1-2 hours, then let it stand for aging to o...

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Abstract

The invention relates to lamellar nanometer barium titanate and a preparation method thereof, and applications in sewage treatment based on piezoelectric photocatalysis. The method for using the laminar nanometer barium titanate in piezoelectric photocatalytic degradation comprises: (a) weighing lamellar nanometer barium titanate, and adding to a methyl orange solution; (b) magnetically stirring in the dark to reach adsorption-desorption equilibrium; (c) transferring into an ultraviolet light source or / and ultrasonic radiation environment, and carrying out a catalytic degradation reaction; (d)sampling by a syringe, carrying out high-speed centrifugation, and taking the upper layer clarified solution; and (e) measuring the absorbance of the solution by using an ultraviolet-visible spectrophotometer, calculating the degradation rate, and characterizing the catalytic performance of the catalyst. According to the present invention, the piezoelectric photocatalyst BTO can establish the internal field strength based on the piezoelectric effect so as to effectively promote the separation of electrons and holes, such that the photocatalytic efficiency can be improved; and the catalytic degradation efficiency can be improved through the simple experimental operations, the cost is cheap, and the product is safe and non-toxic.

Description

technical field [0001] The invention relates to lamellar nano-barium titanate and its preparation method and its application in sewage treatment based on piezoelectric photocatalysis. Background technique [0002] With the development of today's society, people's requirements for environmental protection are becoming more and more stringent. Traditional sewage treatment technology is increasingly difficult to meet people's requirements for water quality, research and development of new water treatment technology is becoming more and more urgent. In recent years, semiconductor photocatalysis has great application value in environmental purification and sewage treatment due to its high catalytic activity, safety, non-toxicity, and high catalytic efficiency. However, the photocatalytic reaction is affected by the low separation efficiency and high recombination rate of photogenerated carriers, resulting in reduced redox ability, which limits the practical application of photoc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/02B01J35/02C02F1/30C02F101/30
CPCB01J23/02B01J35/02B01J35/004C02F1/30C02F2101/40C02F2305/10C02F2101/308
Inventor 刘晓芳肖龙银李念王烨
Owner WUHAN UNIV OF TECH
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