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Silver Surface Modified Mixed Crystalline Titanium Dioxide Nanomesh Photo-Electrocatalytic Composites

A titanium dioxide and surface modification technology, which is applied in the field of photo-electric combined catalytic materials, can solve the problems of fragility and falling off, increase the specific surface area, etc., and achieve the effect of simple and fast preparation method, increase the specific surface area, and stable properties

Active Publication Date: 2021-06-11
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 Crystalline Titanium Dioxide Nanomesh Photo-Electrocatalytic Composites
  • Silver Surface Modified Mixed Crystalline Titanium Dioxide Nanomesh Photo-Electrocatalytic Composites
  • Silver Surface Modified Mixed Crystalline Titanium Dioxide Nanomesh Photo-Electrocatalytic Composites

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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 photo-electrocatalytic composite material of mixed crystal titanium dioxide nano-network with silver surface modification. The preparation method includes: using a titanium mesh as an anode and a platinum sheet as a cathode, placing the anode and the cathode in an electrolyte solution for anodic oxidation reaction to obtain a titanium dioxide nanometer mesh array on the titanium mesh substrate; placing the titanium dioxide nanometer mesh array on the titanium mesh substrate Dip in an ethanol solution in which silver nitrate is dissolved, take it out, dry it, and then perform heat treatment to obtain a silver nanoparticle surface-modified mixed crystal form titanium dioxide nanonet photo-electrocatalytic composite material. The present invention adopts ethanol solution of silver nitrate as a silver source for surface modification, and the amorphous titanium dioxide will not fall off in ethanol. TiO2 can be reduced by depositing silver nanoparticles on the titania nanonetwork, occupying part of the crystal lattice. 2 Its own bandgap width makes the photo-electrocatalytic activity significantly 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 Patents(China)
IPC IPC(8): B01J23/50B01J37/34B01J37/08B82Y30/00C02F1/00C02F1/30B01D53/86B01D53/44B01D53/72C02F101/38C02F101/36C02F101/34
CPCB01D53/007B01D53/44B01D53/72B01D53/8668B01D53/8687B01J23/50B01J35/004B01J37/08B01J37/348B82Y30/00C02F1/00C02F1/30C02F2101/34C02F2101/36C02F2101/38C02F2101/40C02F2305/10Y02C20/30
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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