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Preparation method of Ti<3+>-doped TiO2 composite graphene photocatalyst

A composite graphene and photocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of inability to reduce hydroxyl and carboxyl groups, low alcohol reducibility, environmental pollution, etc., to achieve Improved transfer efficiency, simplified equipment, and reduced production costs

Inactive Publication Date: 2013-04-03
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, hydrazine hydrate is widely used as a reducing agent in the reduction of graphene oxide, but it is highly toxic and causes environmental pollution.
Alcohol has low reducibility and can only reduce epoxy groups in graphene oxide, but not hydroxyl and carboxyl groups.

Method used

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  • Preparation method of Ti&lt;3+&gt;-doped TiO2 composite graphene photocatalyst
  • Preparation method of Ti&lt;3+&gt;-doped TiO2 composite graphene photocatalyst
  • Preparation method of Ti&lt;3+&gt;-doped TiO2 composite graphene photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of Graphene Oxide (GO)

[0032] The "Hummer" method was used to prepare GO, and the specific method was as follows: 3 g of graphite was dispersed in 12 ml of concentrated sulfuric acid containing 2.5 g of potassium persulfate and 2.5 g of phosphorus pentoxide, stirred at 80 °C for 4.5 h, then cooled to room temperature and placed at room temperature for 12 h . The resulting mixture was filtered, washed and naturally dried for 12 h. The pretreated graphite was added to 120ml of concentrated sulfuric acid, and 15g of potassium permanganate was added while stirring while keeping the temperature below 20°C, and stirred at 35°C for 2h. The mixture was diluted with 250 mL of deionized water, and the temperature was kept below 50°C in an ice-water bath. After stirring for 2 h, 0.7 L of deionized water was added, followed by the slow addition of 20 ml of 30% hydrogen peroxide. The mixed solution was bright yellow and bubbling. Stand still, remove the supernatant...

Embodiment 2

[0034] Preparation of Graphene (GR) Composite P25 Photocatalyst

[0035] The graduated cylinder measures 0.02ml of graphene oxide (GO) with a concentration of 2.1mg / ml prepared in Example 1, and disperses it in 40ml of ultrapure water. After ultrasonic dispersion for 1h, add 0.5g of P25, stir magnetically for 1h, and then After ultrasonication for 1h, drying at 100°C, and vacuum activation at 300°C for 3h, a P25 supported graphene (GR) catalyst was obtained, marked as: V-P25-0.02GR.

Embodiment 3

[0037] The graduated cylinder measures 0.05ml of graphene oxide (GO) with a concentration of 2.1mg / ml prepared in Example 1, and disperses it in 40ml of ultrapure water. After ultrasonic dispersion for 1h, add 0.5g of P25, stir magnetically for 1h, and then After ultrasonication for 1h, drying at 100°C, and vacuum activation at 300°C for 3h, a P25 supported graphene (GR) catalyst was obtained, marked as: V-P25-0.05GR.

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Abstract

The invention relates to a preparation method of a Ti<3+>-doped TiO2 composite graphene photocatalyst. Graphene oxide and gas-phase titanium dioxide (P25) are used as precursors to prepare the novel Ti<3+>-doped TiO2 composite graphene photocatalyst by a low-temperature vacuum activation method. Compared with the prior art, the invention can simultaneously implement Ti<3+> autodoping modification of TiO2 by one step, so that the photocatalyst has strong visible light response range; by carrying out reduction modification on the graphene oxide, the photocatalyst has higher electron transmission capacity; and the supporting modification is carried out on the graphene surface by using the TiO2 nanoparticles to generate a Ti-O-C chemical bond, thereby promoting the transfer of photoproduced electrons from TiO2 to the graphene surface. The prepared graphene-supported TiO2 photocatalyst has high ultraviolet and visible light activity, and also has high capacity for hydrogen production by composing water under visible light.

Description

technical field [0001] The invention relates to the field of nanometer photocatalytic materials, in particular to using cheap and easy-to-obtain P25 as a raw material, which can realize the photocatalysis of TiO in one step. 2 Ti 3+ Self-doping modification, reduction modification of graphene oxide, and TiO 2 Compound modification with graphene to obtain a new type of Ti 3+ doped TiO 2 Preparation method of composite graphene photocatalyst. Background technique [0002] It is well known that TiO 2 Photocatalytic technology can only effectively utilize the ultraviolet light energy that is less than 6% of the sun's incidence on the earth's surface, and does not fully have the potential for sustainable development. To overcome TiO 2 This shortcoming of the TiO 2 The study of compound modification with carbon materials to improve its response to visible light has gradually attracted people's attention. Graphene is a rising star in materials science and condensed matter p...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J21/06
Inventor 张金龙邢明阳杨小龙潘月綦殿禹方文章奚振浩周易
Owner EAST CHINA UNIV OF SCI & TECH
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