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A chromium-silver co-doped nano-tio 2 Photocatalyst and preparation method and use thereof

A technology of co-doping and photocatalytic materials, applied in the field of photocatalysis, can solve the problems of high recombination rate, low quantum efficiency, and restrictions on the popularization and use of TiO, and achieve the effects of inhibiting recombination, improving photocatalytic activity, and good visible light absorption performance

Active Publication Date: 2016-08-17
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to TiO 2 Wide band gap (3.2eV), no response to visible light, high recombination rate of photogenerated electron-hole pairs, and low quantum efficiency, thus limiting TiO 2 promotional use of

Method used

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  • A chromium-silver co-doped nano-tio <sub>2</sub> Photocatalyst and preparation method and use thereof
  • A chromium-silver co-doped nano-tio <sub>2</sub> Photocatalyst and preparation method and use thereof
  • A chromium-silver co-doped nano-tio <sub>2</sub> Photocatalyst and preparation method and use thereof

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Experimental program
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Effect test

Embodiment 1

[0031] The invention provides a chromium-silver co-doped nano-TiO 2 The preparation method of the photocatalyst adopts the sol-gel method, and the specific operation steps are:

[0032] (1) Add 10mL of butyl titanate to 20mL of absolute ethanol, add dropwise 2mL of glacial acetic acid, and stir magnetically for 30 minutes until uniformly mixed to obtain solution A;

[0033] (2) Dissolve silver nitrate and ferric nitrate in 2mL of distilled water, pour into 20mL of absolute ethanol, add dropwise 2mL of glacial acetic acid, 2mL of dilute nitric acid (concentration 0.1mol / L), stir magnetically for 25 minutes until uniformly mixed, and obtain solution B The amount of silver nitrate added is 0.1% of the molar fraction of the corresponding titanium particles in the solution A obtained in step (1); the added amount of iron nitrate is 0.5% of the molar fraction of the corresponding titanium particles in the solution A obtained in step (1);

[0034] (3) Under the condition of vigorous...

Embodiment 2

[0038] The invention provides a chromium-silver co-doped nano-TiO 2 The preparation method of the photocatalyst adopts the sol-gel method, and the specific operation steps are:

[0039] (1) Add 10mL of butyl titanate to 20mL of absolute ethanol, add dropwise 2mL of glacial acetic acid, and stir magnetically for 30 minutes until uniformly mixed to obtain solution A;

[0040] (2) Dissolve silver nitrate and ferric nitrate in 2mL of distilled water, pour into 20mL of absolute ethanol, add dropwise 2mL of glacial acetic acid, 2mL of dilute nitric acid (concentration 0.1mol / L), stir magnetically for 25 minutes until uniformly mixed, and obtain solution B The amount of silver nitrate added is 0.5% of the molar fraction of the corresponding titanium particles in the solution A obtained in step (1); the added amount of iron nitrate is 1.0% of the molar fraction of the corresponding titanium particles in the solution A obtained in step (1);

[0041] (3) Under the condition of vigorous...

Embodiment 3

[0048] The invention provides a chromium-silver co-doped nano-TiO 2 The preparation method of the photocatalyst adopts the sol-gel method, and the specific operation steps are:

[0049] (1) Add 10mL of butyl titanate to 20mL of absolute ethanol, add dropwise 2mL of glacial acetic acid, and stir magnetically for 30 minutes until uniformly mixed to obtain solution A;

[0050] (2) Dissolve silver nitrate and ferric nitrate in 2mL of distilled water, pour into 20mL of absolute ethanol, add dropwise 2mL of glacial acetic acid, 2mL of dilute nitric acid (concentration 0.1mol / L), stir magnetically for 25 minutes until uniformly mixed, and obtain solution B The amount of silver nitrate added is 1.0% of the molar fraction of the corresponding titanium particles in the solution A obtained in step (1); the added amount of iron nitrate is 2.5% of the molar fraction of the corresponding titanium particles in the solution A obtained in step (1);

[0051] (3) Under the condition of vigorous...

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Abstract

The invention discloses a chromium-silver co-doped nano TiO2 photo-catalyst, and a preparation method and the use thereof. By using a sol-gel method, the preparation method comprises the following steps: (1) adding butyl titanate into absolute ethyl alcohol, dropwise adding glacial acetic acid, and performing magnetic stirring and uniform mixing to obtain a solution A; (2) dissolving silver nitrate which corresponds to titanium particles and has a molar fraction of 0.1-1 percent, and chromic nitrate which has a molar fraction of 0.5-2.5 percent into distilled water, injecting into the absolute ethyl alcohol, dropwise adding the glacial acetic acid and dilute nitric acid, and stirring to obtain a solution B; (3) dropwise adding the solution B into the solution A, and stirring and aging the solutions to form gel; (4) drying the gel to obtain dried gel; and (5) grinding the dried gel into powder, and firing the powder in air at the temperature of 400-700 DEG C to obtain the chromium-silver co-doped nano TiO2 photo-catalyst. A chromium-silver co-doped nano TiO2 photo-catalytic material is fine and uniform in powder granularity, and high in photo-catalytic activity; the average particle size is 10-25nm.

Description

Technical field: [0001] The invention belongs to the technical field of photocatalysis, in particular to a chromium-silver co-doped nano-TiO 2 Photocatalyst and its preparation method. Background technique: [0002] Titanium dioxide (TiO 2 ) As the most promising photocatalytic material at present, it has broad application prospects in the fields of environmental purification, sewage treatment, and organic matter degradation. Due to TiO 2 Wide band gap (3.2eV), no response to visible light, high recombination rate of photogenerated electron-hole pairs, and low quantum efficiency, thus limiting TiO 2 promotional use. [0003] Element doping is to achieve nano-TiO 2 An effective means for photocatalysts to respond to visible light: On the one hand, ion doping can 2 The impurity energy level and defect energy level are introduced into the forbidden band to narrow the band gap, which is conducive to the transition of electrons from the valence band to the conduction band, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/68C02F1/30C02F101/30
CPCY02W10/37
Inventor 高淑雅刘杰董亚琼陈维铅
Owner SHAANXI UNIV OF SCI & TECH