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Supported nano TiO2 photocatalyst and method for preparing same

A photocatalyst and load-type technology, applied in the field of photocatalysis, can solve the problems of low utilization rate, weak carrier binding force, poor photocatalytic activity, etc., and achieve the effects of easy recycling and reuse, good degradation efficiency, and simple preparation method

Inactive Publication Date: 2016-06-01
SHAANXI UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

At present, there are records in the literature that the titanium dioxide film layer is loaded on glass sheets and ceramics by the sol-gel method, or that nano-titanium dioxide particles are loaded on the surface of tourmaline by the hydrolysis precipitation method, but these technologies all have a small specific surface area of ​​titanium dioxide. , small adsorption amount, poor photocatalytic activity, weak binding force with the carrier, easy to fall off, low utilization rate of light, etc.

Method used

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  • Supported nano TiO2 photocatalyst and method for preparing same
  • Supported nano TiO2 photocatalyst and method for preparing same
  • Supported nano TiO2 photocatalyst and method for preparing same

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preparation example Construction

[0028] A kind of loaded nano TiO 2 The preparation method of photocatalyst comprises the following steps:

[0029] Step 1: Wash the titanium sheet with distilled water, dry it, and then soak it in a chemical polishing solution, wherein the chemical polishing solution is a mixture of hydrofluoric acid, nitric acid and distilled water, and the concentration of hydrofluoric acid in the chemical polishing solution is 2mol / L~ 10mol / L, the concentration of nitric acid is 2mol / L~7mol / L;

[0030] Step 2: Using the constant voltage direct current anodic oxidation method, the titanium sheet treated in step 1 is used as an anode, and the inert electrode is used as a cathode (such as Pt), and the reaction is carried out in an electrolyte solution containing fluorine ions, and the electrolyte solution containing fluoride ions is for NH 4 F, a mixed solution of water and glycerol, in which NH 4 The mass percentage of F is 0.25% to 0.5%, the mass percentage of water is 0.25% to 0.4%, and ...

Embodiment 1

[0034] Step 1: Wash the titanium sheet (2cm×2cm) with distilled water, dry it, and then soak it in a chemical polishing solution for 1 minute. The chemical polishing solution is a mixture of hydrofluoric acid, nitric acid and distilled water, and the concentration of hydrofluoric acid is 2mol / L, the concentration of nitric acid is 5mol / L;

[0035] Step 2: Use the anodic oxidation method, LP series DC stabilized power supply, use the titanium sheet treated in step 1 as the anode, the inert electrode as the cathode, and the distance between the two electrodes is 5cm, and react in the electrolyte solution containing fluorine ions, and the reaction voltage It is 20V, the time is 20h, and the loaded sample is obtained on the anode titanium sheet. The whole anodic oxidation process is carried out at room temperature, accompanied by magnetic stirring, and the electrolyte containing fluorine ions is NH 4 F, a mixed solution of water and glycerol, in which NH 4 The mass percentage of...

Embodiment 2

[0039] Step 1: Wash the titanium sheet (2cm×2cm) with distilled water, dry it, and then soak it in a chemical polishing solution for 1 min. The chemical polishing solution is a mixture of hydrofluoric acid, nitric acid and distilled water, and the concentration of hydrofluoric acid is 10mol / L, the concentration of nitric acid is 2mol / L;

[0040]Step 2: Use the anodic oxidation method, LP series DC stabilized power supply, use the titanium sheet treated in step 1 as the anode, the inert electrode as the cathode, and the distance between the two electrodes is 5cm, and react in the electrolyte solution containing fluorine ions, and the reaction voltage 50V, time 10h, load-type samples were obtained on the anode titanium sheet, the whole anodic oxidation process was carried out at room temperature, and accompanied by magnetic stirring, in which the electrolyte containing fluorine ions was NH 4 F, a mixed solution of water and glycerol, in which NH 4 The mass percentage of F is 0...

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Abstract

The invention discloses a supported nano TiO2 photocatalyst and a method for preparing the same. The method includes washing titanium sheets by the aid of distilled water, then drying the titanium sheets in the air and soaking the titanium sheets in chemical polishing liquid; carrying out reaction between the titanium sheets treated at the first step and inert electrodes in electrolyte with fluorine ions by the aid of anodic oxidation processes to obtain supported test specimens on the titanium sheets which are used as anodes; washing the supported test specimens, drying the supported test specimens by means of blowing, and then carrying out thermal treatment on the supported test specimens to obtain the supported nano TiO2 photocatalyst. The titanium sheets are used as the anodes, and the inert electrodes are used as cathodes. The supported nano TiO2 photocatalyst and the method have the advantages that prepared TiO2 nano tubes directly grow on the titanium sheets by the aid of the anodic oxidation processes, and recycling can be facilitated when photocatalysis experiments are carried out; the prepared TiO2 nano tubes have large specific surface areas and are high in adsorption capacity, photocatalytic reaction can be carried out by under the sunlight, and accordingly excellent organic pollutant degradation effects can be realized.

Description

technical field [0001] The invention belongs to the field of photocatalysis, in particular to a loaded nano TiO 2 Photocatalyst and its preparation method. Background technique [0002] TiO 2 The forbidden band width is relatively large, and it can absorb ultraviolet light with a wavelength less than 388nm, and produce strong oxidizing OH·, which can degrade organic pollutants. But TiO 2 Catalytic activity exists only under ultraviolet light, and the utilization rate of sunlight is low. And the currently used TiO 2 Powder such as P25 powder has a good effect on the degradation of organic pollutants, but because it is powder and suspended in liquid to degrade organic pollutants, the catalyst is easy to lose, difficult to recycle, and cannot be reused. So immobilizing it on the carrier can solve this problem very well, so that the photocatalyst can be reused. At present, there are records in the literature that the titanium dioxide film layer is loaded on glass sheets an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06C02F1/30C02F101/38
CPCC02F1/30B01J21/063C02F2305/10C02F2101/308B01J35/23B01J35/39Y02W10/37
Inventor 胡亚微王晓芳孔霞许涛
Owner SHAANXI UNIV OF SCI & TECH
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