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Composite photocatalyst film as well as preparation method and application thereof

A catalyst and composite light technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low sunlight utilization rate, reduced catalytic activity, unfavorable reuse, etc. Catalytic efficiency, increasing the illuminated area, and reducing the effect of electron-hole recombination rate

Pending Publication Date: 2020-11-24
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But TiO 2 The energy band is wide (Eg=3.2eV), and only less than 5% of the ultraviolet light in sunlight can be used, and the utilization rate of sunlight is low, and electrons (e - )-hole (h + ) high recombination rate, reducing the catalytic activity
Currently, ZnO / TiO 2 Most nanocomposites are powders, which are difficult to recycle and are not conducive to reuse. At the same time, the existing ZnO / TiO 2 Nanocomposites are purely physical mixtures, and their catalytic efficiency needs to be further improved

Method used

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  • Composite photocatalyst film as well as preparation method and application thereof
  • Composite photocatalyst film as well as preparation method and application thereof
  • Composite photocatalyst film as well as preparation method and application thereof

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preparation example Construction

[0036] The present invention also provides a method for preparing the composite photocatalyst film described in the above technical solution, comprising the following steps:

[0037] A titanium dioxide film is provided, the titanium dioxide film is formed by interweaving titanium dioxide nanowires;

[0038] adding the zinc salt solution to the alkali solution to obtain a zinc oxide precursor solution;

[0039] immersing the titanium dioxide film in a zinc oxide precursor solution, and self-assembling to obtain the composite photocatalyst film;

[0040] The molar ratio of the titanium element in the titanium dioxide nanowire to the zinc element in the zinc oxide precursor solution is 4-12:1.

[0041] In the present invention, unless otherwise specified, all raw materials are commercially available products well known to those skilled in the art.

[0042] In the present invention, the preparation method of the titanium dioxide film comprises the following steps:

[0043] Afte...

Embodiment 1

[0073] Ultrasonicate 0.14g tetra-n-butyl titanate and 15mL deionized water at a power of 100W for 15min to obtain Ti(OH) 4 colloid;

[0074] The Ti(OH) 4 The colloid and 20mL10mol / L sodium hydroxide solution were sonicated for 15min at a power of 100W to obtain 35mL sodium titanate film precursor solution;

[0075] Transfer the sodium titanate film precursor solution to a 50mL autoclave with a polytetrafluoroethylene liner, and react at 200°C for 48h to obtain a sodium titanate film; the linear titanium in the sodium titanate film The diameter of sodium bicarbonate is 70-80nm, and the aspect ratio is 500-600:1;

[0076] Rinse the sodium titanate film from the surface of the polytetrafluoroethylene liner with deionized water and soak it in a hydrochloric acid solution with a concentration of 0.1 mol / L for 24 hours to obtain a titanate film;

[0077] Soak and wash the phthalic acid film in deionized water for 40 minutes, and repeat the soaking and washing 4 times; use a dropp...

Embodiment 2

[0085] Composite photocatalyst film is prepared according to the preparation method of embodiment 1, the difference is that Zn(NO 3 ) 2 The solution was replaced by Zn(CH 3 COO) 2 solution.

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Abstract

The invention belongs to the technical field of photocatalysts, and particularly relates to a composite photocatalyst film as well as a preparation method and application thereof. The composite photocatalyst film provided by the invention comprises the following components in percentage by mass: 3.8 to 18 percent of a ZnO nanorod and 82 to 96.2 percent of a TiO2 nanowire, wherein the ZnO nanorod vertically grows on the surface of the TiO2 nanowire and is in a multi-branch shape; and a heterojunction is formed between the ZnO nanorod and the TiO2 nanowire. A film structure of the composite photocatalyst film provided by the invention is a self-supporting film, can keep a good form, is easy to recycle, and is beneficial to reuse. A structural relation between the zinc oxide nanorod and the titanium dioxide nanowire in the composite photocatalyst film provided by the invention is similar to the structure of bamboo leaves and bamboo poles, so that the illumination area is increased, and the photocatalytic efficiency is improved. Results of embodiments show that the composite photocatalyst film provided by the invention has excellent photocatalytic performance.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, and in particular relates to a composite photocatalyst thin film and its preparation method and application. Background technique [0002] In recent years, semiconductor photocatalysis technology, as a green environmental treatment technology that uses semiconductors as catalysts and uses light energy to deeply decompose organic pollutants, has become an ideal and effective means of saving energy and protecting the environment. TiO 2 Because of its excellent photocatalytic performance, stable physical and chemical properties, non-toxicity and low cost, it is currently the most commonly used semiconductor photocatalytic material. But TiO 2 The energy band is wide (Eg=3.2eV), and only less than 5% of the ultraviolet light in sunlight can be used, and the utilization rate of sunlight is low, and electrons (e - )-hole (h + ) The recombination rate is high, which reduces the catalytic activ...

Claims

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Application Information

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IPC IPC(8): B01J23/06B01J35/06B01J37/02C02F1/30C02F101/30
CPCB01J23/06B01J23/002B01J37/0201C02F1/30C02F2101/308C02F2305/10B01J35/39B01J35/40B01J35/59
Inventor 武军竹秋妮方静曹雪波
Owner JIAXING UNIV
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