Carbon nano onion/titanium dioxide/silicon dioxide composite photocatalytic material as well as preparation method and application thereof

A technology of composite photocatalysis and titanium dioxide, applied in the field of photocatalytic materials, can solve the problems of short wavelength and low quantum efficiency, and achieve the effects of inhibiting separation, improving catalytic efficiency and high visible light catalytic activity

Active Publication Date: 2018-11-30
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its practical application is affected by low quantum efficiency and wide bandgap (3.2eV for anatase, 3.0eV for rutile), which mak

Method used

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  • Carbon nano onion/titanium dioxide/silicon dioxide composite photocatalytic material as well as preparation method and application thereof
  • Carbon nano onion/titanium dioxide/silicon dioxide composite photocatalytic material as well as preparation method and application thereof
  • Carbon nano onion/titanium dioxide/silicon dioxide composite photocatalytic material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Example 1:

[0035] A nano-onion carbon / titanium dioxide / silica (CNOs / TiO 2 / SiO 2 ) The specific steps of the catalyst preparation method are as follows:

[0036] (1) Purification of CNOs

[0037] Weigh 15g of CNOs and disperse it in 750mL of 68% nitric acid solution with a mass fraction of 68%. The acid solution is refluxed for 2 hours at 80 °C. The pickled product is repeatedly washed with distilled water until the pH is neutral, dried at 80 °C, and calcined at 400 °C , Grinding;

[0038] (2) CNOs / TiO 2 / SiO 2 Preparation

[0039] 1) Mix 6 mL of titanium tetraisopropoxide and 3 mL of isopropanol solution and stir for 1 min. Weigh 0.0192 g of the acid-washed CNOs into the mixed solution and stir, transfer the mixed solution to the dropping funnel, and add it dropwise. In a 42mL distilled water round bottom flask, the dropping rate is controlled at 0.3mL / min, while stirring, turn on the condensation system;

[0040] 2) Add 1mL of nitric acid solution dropwise to the mixed solut...

Example Embodiment

[0051] Example 2:

[0052] (1) CNOs purification

[0053] Weigh 15g of CNOs and disperse it in 750mL of 68% nitric acid solution with a mass fraction of 68%. The acid solution is refluxed for 2h at 80 °C. The pickled product is repeatedly washed with distilled water until the pH is neutral, and dried at 80 °C, 400 °C Calcination, grinding;

[0054] (2) CNOs / TiO 2 / SiO 2 preparation

[0055] 1) Mix 6 mL of titanium tetraisopropoxide and 3 mL of isopropanol solution and stir for 1 min. Weigh 0.0576 g of the acid-washed CNOs into the mixed solution and stir, transfer the mixed solution to the dropping funnel, and add it dropwise. In a 42mL distilled water round bottom flask, the dropping rate is controlled at 0.3mL / min, while stirring, turn on the condensation system;

[0056] 2) Add 1mL of nitric acid solution dropwise to the mixed solution of step 1), the dropping rate is controlled to 0.25mL / min, heated and stirred in a 70℃ water bath, after the reaction is completed, the cooling wate...

Example Embodiment

[0063] Example 3:

[0064] (1) CNOs purification

[0065] Weigh 15g of CNOs and disperse it in 750mL of 68% nitric acid solution with a mass fraction of 68%. The acid solution is refluxed for 2h at 80 °C. The pickled product is repeatedly washed with distilled water until the pH is neutral, and dried at 80 °C, 400 °C Calcination, grinding;

[0066] (2) CNOs / TiO 2 / SiO 2 preparation

[0067] 1) Mix 7mL of titanium tetraisopropoxide and 3mL of isopropanol solution and stir for 1min, weigh 0.0192g of the acid-washed CNOs into the mixed solution and stir, transfer the mixed solution to the dropping funnel, add dropwise In a 42mL distilled water round bottom flask, the dropping rate is controlled at 0.3mL / min, while stirring, turn on the condensation system;

[0068] 2) Add 1mL of nitric acid solution dropwise to the mixed solution of step 1), the dropping rate is controlled to 0.25mL / min, and the water bath is heated and stirred at 70 °C. After the reaction is completed, the cooling water...

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Abstract

The invention discloses a preparation method and application of a carbon nano onion/titanium dioxide/silicon dioxide (CNOs/TiO2/SiO2) composite photocatalytic material. The method uses titanium tetraisopropoxide (C12H28O4Ti) as a titanium source, purified carbon nano onions (CNOs) as a carbon source, and ethyl orthosilicate (C8H20O4Si) as a silicon precursor to prepare the CNOs/TiO2/SiO2 compositephotocatalytic material through a sol-gel method. According to the method disclosed by the invention, active components of the photocatalytic material obtained by the method are not easy to fall offand have high stability; the obtained composite catalyst has a large specific surface area, and an obviously-improved adsorption effect on pollutants; introduction of the CNOs greatly inhibits TiO2 photogenerated electron-hole compounding, and improves catalytic activity; and the photocatalytic material effectively solves the two bottleneck difficult problems of a low quantum yield and a poor adsorption effect in a photocatalysis technology.

Description

technical field [0001] The invention relates to a nano-onion carbon / titanium dioxide / silicon dioxide composite photocatalytic material and a preparation method and application thereof, belonging to the field of photocatalytic materials. Background technique [0002] Water is the source of life, but with the continuous development of industry, the problem of water pollution is becoming more and more serious. Photocatalytic technology has the characteristics of simple operation, low energy consumption and no secondary pollution. Its development has brought a new development direction to the treatment of environmental pollutants. [0003] Among semiconductor photocatalysts, TiO2 has been widely studied for its high chemical stability, low cost, easy availability, non-toxicity and high photocatalytic efficiency. However, its practical application is affected by low quantum efficiency and wide bandgap (3.2eV for anatase, 3.0eV for rutile), which makes it easy to recombine photog...

Claims

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Application Information

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IPC IPC(8): B01J21/18C02F1/30C02F101/38C02F101/36C02F101/34
CPCB01J21/18B01J35/004C02F1/30C02F2101/34C02F2101/36C02F2101/38
Inventor 张卫珂杨艳青贾佳王佳玮邓钏
Owner TAIYUAN UNIV OF TECH
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