Piezoelectric photocatalyst, preparation method and application

A photocatalyst and piezoelectric technology, applied in the field of environmental science, can solve problems such as high current-carrying recombination rate, influence on application prospects, and limited research field of view, and achieve the effect of simple operation method

Active Publication Date: 2021-06-18
CHANGAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of this technology relies heavily on charge separation and transfer kinetics, i.e., the catalytic reaction mainly depends on the generation and separation of electron-hole pairs, and their efficient separation and migration are crucial for participating in reduction and / or oxidation reactions. Important, and these are the inherent defects faced by the actual use of photocatalysts, resulting in photocatalyst performance still lower than expected
[0004] In order to solve such problems, predecessors have proposed strategies to promote charge transfer on the surface of photocatalysts, such as heterojunction, metal or metal oxide modification, and surface defect engineering. However, such previous studies only focus on the improvement of materials in the field of photocatalysis. However, the research field of view is relatively limited, and the current-carrying recombination rate of the prepared material is still high, which affects its practical application prospects.

Method used

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  • Piezoelectric photocatalyst, preparation method and application
  • Piezoelectric photocatalyst, preparation method and application
  • Piezoelectric photocatalyst, preparation method and application

Examples

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preparation example Construction

[0040] Preparation of CTOC: Pivalic acid (2.14g) and ethylene glycol (70ml) were mixed ultrasonically (40KHz) for 10min until the solution was clear, then tetrabutyl titanate (2.14ml) was added dropwise, and the mixed solution was subjected to ultrasound ( Power 120W, frequency 40KHz) for 10min, react at 100°C for 24h. The obtained product was washed three times with tetrahydrofuran, and dried under vacuum (0.09Mpa) at 60°C for 12h.

[0041] Preparation of CuS: Cu(NO 3 ) 2 ·3H 2 O (0.2416g, 1mmol) and ethylene glycol (40ml) were added to the reactor liner, followed by CH 4 N 2 S (0.1522, 2 mmol), the mixture was ultrasonically treated for 30 min, and reacted at 150°C for 24 h. The product was washed three times alternately with deionized water and ethanol, and dried at 60 °C for 4 h.

[0042] BaTiO 3 / CuS preparation: add 0.2g CuS prepared above to the lining of the reactor, add Ba(OH) 2 ·8H2 O (0.0271g) and TiO 2 (0.0068g), and 5ml of diethylene glycol, 5ml of ethano...

Embodiment 1

[0047] Binary composite BaTiO 3 / CuS is prepared by the following method: Weigh 0.2g of CuS prepared into the lining of the reactor, add Ba(OH) 2 ·8H 2 O (0.0027g) and TiO 2 (0.0007g), and 5ml of diethylene glycol, 5ml of ethanol, 1.5ml of isopropanol, 0.6g of tetrabutylammonium hydroxide solution (TBAH, 40wt%) and 7ml of deionized water were added as reaction solvents. The mixture was placed in an oven at 170°C for 4 h. The resulting product was washed with deionized water and ethanol and dried to obtain a mass ratio (m BaTiO3 :m CuS ) is 1wt% binary composite material BaTiO 3 / CuS, simplified as BC-1, and used for the degradation of tetracycline hydrochloride.

Embodiment 2

[0049] The present embodiment is different from Embodiment 1 in that: Ba(OH) 2 ·8H 2 O and TiO 2 The addition amounts of the two components are 0.0271g and 0.0068g respectively, and the mass ratio of the binary composite material is 10wt%, which is simplified as BC-10.

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Abstract

The invention discloses a piezoelectric photocatalyst, a preparation method and application thereof. The piezoelectric photocatalyst is characterized in that CTOC and a binary composite material BaTiO3 / CuS are compounded to form a ternary composite material, wherein a mass ratio of the BaTiO3 to the CuS in the binary composite material is 10 wt%, and the mass ratio of the CTOC to the BaTiO3 / CuS in the ternary composite material is 4:3. According to the invention, the preparation method is simple; the piezoelectric material BaTiO3 is adopted to modify the photocatalyst, so that the prepared composite catalyst has good catalytic activity and stability; and under the combined action of illumination and ultrasound, the degradation rate of tetracycline hydrochloride in water can reach 100%.

Description

technical field [0001] The invention relates to the field of environmental science, in particular to a piezoelectric photocatalyst, a preparation method and an application. Background technique [0002] With the rapid development of globalization, resulting in a large accumulation of organic and inorganic toxic compounds, water pollution has become an urgent problem to be solved. Among them, tetracycline hydrochloride (TC), as an antibiotic widely used in medicine and agricultural and veterinary drugs, discharges a large amount of polluting wastewater during production and use, aggravates water environment pollution, and poses a threat to the ecological environment and human health. [0003] Among various water environment remediation methods, the use of photocatalytic semiconductor materials and renewable solar energy to degrade pollutants is considered to be a promising green technology for environmental remediation. The performance of this technology relies heavily on ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J37/10B01J37/34C02F1/30C02F101/38C02F101/34C02F101/36
CPCB01J27/04B01J23/002B01J37/10B01J37/343C02F1/30C02F2305/10C02F2101/38C02F2101/34C02F2101/36B01J35/39B01J35/23B01J35/33Y02W10/37
Inventor 李宇亮周鲁平秦延林林绪亮徐帅吴欣朱棋
Owner CHANGAN UNIV
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