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Iron oxide doped mixed crystal form titanium dioxide nano-net photocatalytic composite material

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

Pending Publication Date: 2020-06-05
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although there are many doping modification methods for titanium dioxide nanonets: 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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  • Iron oxide doped mixed crystal form titanium dioxide nano-net photocatalytic composite material
  • Iron oxide doped mixed crystal form titanium dioxide nano-net photocatalytic composite material
  • Iron oxide doped mixed crystal form titanium dioxide nano-net photocatalytic composite material

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Embodiment 1

[0041] This embodiment provides a method for preparing iron oxide-doped titanium dioxide nano-network photocatalytic composite material in mixed crystal form, which includes the following steps:

[0042] (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.

[0043] (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 oxidati...

Embodiment 2

[0055] Embodiment 2 different concentration experiments

[0056] Prepare iron oxide doped TiO according to Example 1 2 Nano-mesh arrays, using ferric chloride ethanol solutions with mass concentrations of 0.1%, 0.63%, and 1%, respectively, and the prepared samples were named TiO 2 -Fe 2 o 3 -A,TiO 2 -Fe 2 o 3 -B,TiO 2 -Fe 2 o 3 -C; using 50mL methylene blue solution with a concentration of 12mg / L as the target degradation product, the titanium mesh substrate TiO modified with different concentrations of iron oxide 2 The nanomesh array was placed in it, and its photocatalytic activity was tested (the photocatalytic experimental device is the CEL-APR100H reactor of Beijing Zhongjiao Jinyuan Technology Co., Ltd., and the light source is a 500W xenon lamp), and the supernatant was taken out every 30 minutes at room temperature Measure its absorbance in a UV-Vis spectrophotometer, and calculate its concentration according to the F factor, the results are as follows figure...

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Abstract

The invention provides an iron oxide doped mixed crystal form titanium dioxide nano-net photocatalytic composite material. A preparation method comprises the steps of placing a titanium mesh as an anode and a platinum sheet as a cathode in an electrolyte for an anodic oxidation reaction so that a titanium dioxide nano-mesh array of a titanium mesh substrate is obtained, placing the titanium dioxide nano-net array of the titanium net substrate in an ethanol solution dissolved with ferric chloride for dipping treatment, taking out the titanium dioxide nano-net array, drying the titanium dioxidenano-net array, and then carrying out heat treatment to obtain the ferric oxide doped mixed crystal form titanium dioxide nano-net photocatalytic composite material. An ethanol solution of ferric chloride is used as an iron source for doping, amorphous titanium dioxide does not fall off in ethanol, and ferric oxide is generated after a thermal reaction of ferric chloride. Iron oxide is deposited on the titanium dioxide nano-net, a part of crystal lattices are occupied, the band gap width of TiO2 can be changed, and the photocatalytic activity is improved, and meanwhile, the product is of a net-shaped thin film structure, so that the use is convenient and secondary pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and relates to a photocatalytic composite material of ferric oxide doped mixed crystal titanium dioxide nano-network. 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 modification me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J37/03B01J37/34B01J35/06C02F1/30C02F101/30C02F101/38C02F101/36
CPCB01J23/745B01J37/031B01J37/348C02F1/30C02F2101/40C02F2101/38C02F2101/36C02F2101/30C02F2305/10B01J35/59B01J35/39
Inventor 侯军伟周婧怡刘亚锋黄秉轩王雅斐程安迪皮婧婧宋琪吴梅杜春安
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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