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Silver surface modified mixed crystal type titanium dioxide nano-net photo-electro-catalytic composite material

A technology of titanium dioxide and surface modification, which is applied in the field of photo-electric combined catalytic materials, can solve the problems of increasing specific surface area, brittleness and falling off, etc., and achieves the effects of high catalytic reaction activity, simple and fast preparation method, and stable properties

Active Publication Date: 2020-06-02
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention uses the ethanol solution of silver nitrate, which can perfectly solve the problem of amorphous TiO 2 It is easy to break and fall off in water. The use of 200-mesh titanium dioxide nano-mesh greatly increases the specific surface area, and the nano-mesh is a block material, which is easy to replace and will not cause secondary pollution.

Method used

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  • Silver surface modified mixed crystal type titanium dioxide nano-net photo-electro-catalytic composite material
  • Silver surface modified mixed crystal type titanium dioxide nano-net photo-electro-catalytic composite material
  • Silver surface modified mixed crystal type titanium dioxide nano-net photo-electro-catalytic composite material

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Embodiment 1

[0044] This embodiment provides a method for preparing silver-surface-modified mixed crystal titanium dioxide nano-net photo-electrocatalytic composite material, which includes the following steps:

[0045] (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.

[0046] (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 oxid...

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Abstract

The invention provides a silver surface modified mixed crystal form titanium dioxide nano-net photo-electro-catalytic composite material. The preparation method comprises the following steps: placinga titanium mesh serving as an anode and a platinum sheet servng as a cathode in an electrolyte, and carrying out an anodic oxidation reaction to obtain a titanium dioxide nano-net array of a titaniummesh substrate; and putting the titanium dioxide nano-net array of the titanium net substrate into an ethanol solution dissolved with silver nitrate for dipping treatment, taking out the titanium dioxide nano-net array, drying the titanium dioxide nano-net array, and then carrying out heat treatment to obtain the silver nanoparticle surface modified mixed crystal form titanium dioxide nano-net photo-electro-catalytic composite material. The ethanol solution of silver nitrate is used as a silver source for surface modification, and amorphous titanium dioxide does not fall off in ethanol. Silvernano-particles are deposited on a titanium dioxide nano-net, and part of crystal lattices are occupied, so the band gap width of TiO2 can be reduced, and the photo-electro-catalytic activity is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of photo-electric combined catalytic materials, and relates to a photo-electrocatalytic composite material of mixed crystal titanium dioxide nano-network with silver surface modification. 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. The electrocatalytic oxidation technology currently used for sewage treatment has multiple functions such as oxidation, reduction, neutralization, coagulation, and air flotation. No drugs are added during the treatment process, no ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50B01J37/34B01J37/08B82Y30/00C02F1/00C02F1/30B01D53/86B01D53/44B01D53/72C02F101/38C02F101/36C02F101/34
CPCB01J23/50B01J37/348B01J37/08B82Y30/00C02F1/00C02F1/30B01D53/8687B01D53/44B01D53/007B01D53/8668B01D53/72C02F2101/40C02F2101/38C02F2101/36C02F2101/34C02F2305/10B01J35/39Y02C20/30
Inventor 侯军伟周婧怡黄秉轩王雅斐刘亚锋程安迪宋琪皮婧婧惠泽友陈紫荆
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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