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Zinc oxide doped mixed crystal form titanium dioxide nanotube photocatalytic composite material

A technology of titanium dioxide and composite materials, applied in the field of photocatalytic materials, can solve the problems of rare raw materials, limited wide application, complicated preparation process, etc., and achieve the effects of stable properties, high photocatalytic reaction activity, and extended energy range.

Pending Publication Date: 2020-04-28
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although there are many doping and modification methods for titanium dioxide nanotubes: non-metal doping, noble metal doping, transition metal doping, semiconductor compound modification, etc., the preparation process is complicated and the raw materials are scarce, which greatly limits the wide application.

Method used

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  • Zinc oxide doped mixed crystal form titanium dioxide nanotube photocatalytic composite material
  • Zinc oxide doped mixed crystal form titanium dioxide nanotube photocatalytic composite material
  • Zinc oxide doped mixed crystal form titanium dioxide nanotube photocatalytic composite material

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Embodiment 1

[0040] This embodiment provides a method for preparing a zinc oxide-doped mixed crystal titanium dioxide nanotube photocatalytic composite material, which includes the following steps:

[0041] (1) Titanium mesh pretreatment: put the pure titanium mesh in a beaker of propanol, methanol, and isopropanol in turn, place it in an ultrasonic cleaner for 10 minutes, and after taking it out, clean it with deionized water for 5 minutes and dry it for later use ; Then use mixed acid (HF: glacial acetic acid = 1:8) to ultrasonically clean to remove the surface oxide film; then wash with deionized water and ethanol for 2-5 minutes, dry, and seal.

[0042] (2) take the metal Pt sheet as the cathode, and the titanium mesh with the smooth surface obtained in the step (1) as the anode, the distance between the two electrodes is 7cm, and the NH containing 0.5wt% 4 F, 3% vol of H 2 Anodic oxidation is carried out in the electrolyte of ethylene glycol solution of O. The whole oxidation process...

Embodiment 2

[0054] Embodiment 2 repeatability experiment

[0055] The TiO doped with zinc oxide after the photocatalytic test of Example 1 2 The nanotube network array was taken out and placed in deionized water for 5 minutes, dried, and the second photocatalytic test was carried out; using 50 mL of methylene blue solution with a concentration of 12 mg / L as the target degradation product, the zinc oxide-modified titanium mesh substrate TiO 2 The nanotube network array was placed in it, and its photocatalytic activity was tested (the photocatalytic experimental device was the CEL-APR100H reactor of Beijing Zhongjiao Jinyuan Technology Co., Ltd., and the light source was a 500W xenon lamp). The supernatant was taken out every 30 minutes at room temperature The absorbance of the liquid was measured in a UV-visible spectrophotometer, and its concentration was calculated according to the F factor. The results were as follows: figure 1 (ZnO-TiO 2 -B).

[0056] Depend on figure 1 It can be s...

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Abstract

The invention provides a zinc oxide doped mixed crystal form titanium dioxide nanotube photocatalytic composite material. The preparation method of the material comprises the steps: using a titanium mesh as an anode and a platinum sheet as a cathode, and placing the anode and the cathode in an electrolyte for an anodic oxidation reaction to obtain a titanium dioxide nanotube mesh array of a titanium mesh substrate; and putting the titanium dioxide nanotube mesh array of the titanium mesh substrate into an ethanol solution dissolved with zinc acetate for dipping treatment, taking out the titanium dioxide nanotube mesh array, drying the titanium dioxide nanotube mesh array, and then carrying out heat treatment to obtain the zinc oxide doped mixed crystal form titanium dioxide nanotube photocatalytic composite material. The ethanol solution of zinc acetate is used as a zinc source for doping, amorphous titanium dioxide cannot fall off in ethanol, zinc acetate is completely decomposed to generate zinc oxide, CO2 and water, and pollution cannot be caused. Zinc oxide is deposited on a titanium dioxide nanotube to occupy part of crystal lattices so that the band gap width of TiO2 can be reduced and the photocatalytic activity is improved.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and relates to a photocatalytic composite material of zinc oxide doped mixed crystal titanium dioxide nanotubes. Background technique [0002] TiO 2 Due to its biochemical inertness, non-toxicity, low cost, and corrosion resistance, it is regarded as a suitable photocatalytic material for environmental pollution treatment, and has been widely used in the degradation of harmful substances and water pollutants. However, due to TiO 2 The wide bandgap width of photocatalysts (3.0-3.2eV) leads to low utilization rate of visible light, and can only be excited by ultraviolet light to generate electron-hole pairs. To expand TiO 2 To improve its photocatalytic performance under visible light, it needs to be modified and doped. It is a very effective way to couple narrow-bandgap semiconductor materials to form heterojunctions. [0003] Although there are many doping and modification met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06B01J37/34C25D11/26C23C18/12C02F1/30C02F101/30C02F101/38C02F101/36
CPCB01J23/06B01J23/002B01J37/348C25D11/26C23C18/1216C02F1/30C02F2305/10C02F2101/40C02F2101/38C02F2101/36C02F2101/30B01J35/39
Inventor 侯军伟周婧怡刘亚锋刘烨妍宋琪程安迪魏景垣张元勃刘艳升杜春安
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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