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Preparing method of core-shell TiO2/ZnO photocatalyst and applications thereof

A photocatalyst, 2·2H2O technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., to achieve the effect of effective separation

Inactive Publication Date: 2008-07-23
HARBIN INST OF TECH
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  • Summary
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  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the valence band electrons can transition to the conduction band to form the separation of photogenerated electrons and holes only under the excitation of ultraviolet light with a wavelength of 387nm in the existing photocatalyst, and provides a core-shell type TiO 2 Preparation method and application of ZnO photocatalyst

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  • Preparing method of core-shell TiO2/ZnO photocatalyst and applications thereof
  • Preparing method of core-shell TiO2/ZnO photocatalyst and applications thereof

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specific Embodiment approach 1

[0009] Specific implementation mode 1: In this embodiment, core-shell type TiO 2 The steps of the / ZnO photocatalyst preparation method are as follows: one, according to Zn(CH 3 COO) 2 2H 2 The mass ratio of O to polyvinyl alcohol is 2:1 to make Zn(CH 3 COO) 2 2H 2 O is dissolved in a polyvinyl alcohol solution with a weight concentration of 4-6%, mixed in a water bath at 80-100°C and stirred at a speed of 150-200r / min for 0.5-1 hour, and then mixed at 100-120°C Dry under low temperature for 1-2 hours, heat the dried product to 300°C for 0.5-1 hour, continue to heat up to 400°C for 0.5-1 hour, then raise the temperature to 550°C for 0.5-1 hour, and then cool it to room temperature in the air 2. After mixing and stirring 1-2 parts by weight of tetrabutyl titanate, 4-5 parts by weight of absolute ethanol and 0.1-0.3 parts by weight of triethanolamine for 1.5-2 hours, aging for 0.5-1 hours, press The mass ratio of the product to tetrabutyl titanate in step 1 is 2-4:1. Add th...

specific Embodiment approach 2

[0014] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in step two, 1.1-1.5 parts by weight of tetrabutyl titanate, 4.1-4.5 parts by weight of absolute ethanol and triethanolamine of 0.11-0.2 parts by weight Mix, and others are identical with specific embodiment one.

specific Embodiment approach 3

[0015] Specific embodiment three: the difference between this embodiment and specific embodiment one is that in step two, 1.6-1.9 parts by weight of tetrabutyl titanate, 4.6-4.9 parts by weight of absolute ethanol and triethanolamine of 0.21-0.29 parts by weight Mix, and others are identical with specific embodiment one.

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Abstract

The invention relates to a preparation method of core-shell TiO2 / ZnO photocatalyst and the application thereof, which relates to the preparation method of a photocatalyst and the application thereof. The invention solves the problem that the valence band electron of the existing photocatalyst can transit onto a conduction band only under the excitation of ultraviolet radiation. The preparation method of the invention is that: 1. Zn(CH3 / COO)2 / 2H2 / O is mixed into a Polyvinyl alcohol solution and heated in step after being dried and then cooled down to room temperature; 2. tetrabutyl titanate, absolute ethyl alcohol and triethanolamine are mixed together and aged, then the product of the step 1 is added into the solution for dissolving following by drying and heat treatment. The core-shell TiO2 / ZnO photocatalyst prepared by the invention is painted on cross linked ethylene, layered perovskite, molten salt crystal water and salt or Al-Si material as thermal energy storage material. The electron of the TiO2 in the invention can transit onto the conduction band under common lighting condition, which leads photo electron to be effectively separated.

Description

technical field [0001] The invention relates to a preparation method and application of a photocatalyst. Background technique [0002] In recent years, solar energy has been used as a major energy source for many years, but these research applications are far from achieving the effect of effectively utilizing solar energy. TiO 2 It has the function of catalyzing the decomposition of organic matter under light conditions. However, prior art exists TiO 2 The photocatalyst has a wide band gap (Eg=3.2eV,), and only under the excitation of ultraviolet light with a wavelength of 387nm, the valence band electrons can jump to the conduction band to form the separation of photogenerated electrons and holes. Moreover, due to the recombination of electrons and holes generated by light excitation, the light quantum efficiency is very low. Contents of the invention [0003] The purpose of the present invention is to solve the problem that the valence band electrons can transition to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06B01J21/06B01J35/02
Inventor 鞠春华王福平
Owner HARBIN INST OF TECH
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