Piezoelectric-photocatalyst for enhancing photocatalytic degradation reaction, preparation method and application thereof

A photocatalyst and degradation reaction technology, applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, heterogeneous catalyst chemical elements, etc., can solve secondary pollution, energy consumption, increase Catalyst cost and other issues, to achieve the effect of increasing rate and mineralization degree, and stabilizing chemical properties

Inactive Publication Date: 2019-03-29
SHANGHAI NORMAL UNIVERSITY +1
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  • Abstract
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Problems solved by technology

[0003] 201810681760.1 discloses a photocatalytic system, including sequentially setting: a nonvolatile polarization field layer, a conductive layer and a photocatalyst layer; Obtained; the ferroelectric material is selected from lead magnesium niobate ferroelectric materials, bismuth titanate or lead zirconate titanate; the conductive layer is selected fro

Method used

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  • Piezoelectric-photocatalyst for enhancing photocatalytic degradation reaction, preparation method and application thereof
  • Piezoelectric-photocatalyst for enhancing photocatalytic degradation reaction, preparation method and application thereof
  • Piezoelectric-photocatalyst for enhancing photocatalytic degradation reaction, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0027] A preparation method of a piezoelectric-photocatalyst for enhancing photocatalytic degradation reaction, comprising the following steps:

[0028] (1) Preparation of piezoelectric material lead zirconate titanate powder: mix zirconia, titanium oxide, and lead oxide mixed powders according to the molar ratio of lead element, zirconium element, and titanium element for 6 hours by ball milling at 800 ° C and 1200 °C respectively. ℃ Calcination 2h. After crushing, the lead zirconate titanate powder with a spherical structure can be obtained, and the lead zirconate titanate powder with a spherical structure can be obtained;

[0029] (2) Disperse 0.4g of lead zirconate titanate powder in 120mL of absolute ethanol, disperse in an ultrasonic bath for 15min, then add 2mL of concentrated ammonia water, and then add 2.0mL of tetrabutyl titanate dropwise, and transfer the above mixed liquid to In a 200mL stainless steel sealed hydrothermal kettle, place it in an oil bath at 110°C a...

Embodiment 2

[0033] The piezoelectric-photocatalyst obtained in Example 1 was dispersed in a 10 mg / L rhodamine B dye solution so that its mass fraction was 2 g / L.

[0034] like image 3 , given at 15mW·cm -2 The test results of photocatalytic degradation of Rhodamine B at stirring rates of 200, 400, 600 and 800rpm under ultraviolet light irradiation showed that the stronger piezoelectric field induced by higher stirring rates can promote the photocatalytic reaction.

Embodiment 3

[0036] The operation steps of Example 2 were repeated, except that the detection target was the total organic carbon content in the solution. The result was similar to that of Example 1, and the total organic carbon content was significantly reduced as the stirring intensity increased.

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Abstract

The invention relates to a piezoelectric-photocatalyst for enhancing photocatalytic degradation reaction, a preparation method and an application thereof. The material is prepared through three stepsof preparing lead zirconate titanate powder as a piezoelectric material, preparing a titanium oxide nano-wrapped particle precursor and using photocatalyst titanium oxide nano-particle for coating thelead zirconate titanate powder. The piezoelectric-photocatalyst is applied to a liquid phase catalytic degradation reaction system of rhodamine B dye, bisphenol A, parachlorophenol and phenol under the conditions of ultraviolet light power density of 1-20mW.cm-2 and magnetic stirring revolving rate of 200-1200rpm. Compared with the prior art, the invention has the advantages that only liquid mechanical energy is required for inducing a proper piezoelectric field, other element doped or heterogeneous structure is not required, and the photocatalytic reaction effect is obviously promoted. The compound catalyst with a core-shell structure has stable mechanical properties and chemical properties, is capable of treating environment while has no side effect to environment.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a piezoelectric-photocatalyst which uses fluid mechanical energy captured by a piezoelectric material to induce a piezoelectric field to enhance photocatalytic degradation performance, and a preparation method and application thereof. Background technique [0002] Semiconductor photocatalysis is a promising technology to solve environmental pollution and energy shortage. However, the development and practical application of this technology are severely limited by the severe recombination of photogenerated electron-holes, such as low catalytic efficiency and low photon quantum efficiency. The traditional methods to improve the photocatalytic reaction include improving the crystallinity, specific surface area or exposed crystal plane, electronic structure, photocatalytic recombination and semiconductor heterojunction recombination of semiconductors. The experimental data show that the pie...

Claims

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Application Information

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IPC IPC(8): B01J23/14C02F1/32C02F101/34C02F101/36
CPCB01J23/002B01J23/14B01J35/0013B01J35/0033B01J35/004B01J35/008B01J2523/00C02F1/32C02F2101/308C02F2101/34C02F2101/345C02F2101/36C02F2305/10B01J2523/44B01J2523/47B01J2523/48
Inventor 卞振锋陈瑶冯亚伟郑茹曹锋雷李魏李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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