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

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...

AI Technical Summary

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 from one or more of Au, Ag, Cu and In, and the noble metal plus Large catalyst cost and metals are easy to cause secondary pollution; the photocatalyst layer is selected from CdS and / or TiO 2 , while CdS is unstable and prone to photocorrosion

The method is complicated and needs to be calcined at high temperature for a long time, which consumes energy and time

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