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Preparation method of boron-doped graphene nano-sheet composite TiO2 photocatalyst

A technology of graphene nanosheets and photocatalysts, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of unfavorable industrial production, high price, high energy consumption, etc., and achieve high photogenerated electrons Ability and electron transmission ability, reduce production cost, effect of simple equipment

Inactive Publication Date: 2013-03-20
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the doping of traditional metal or non-metal ions will lead to TiO 2 The thermal stability of the catalyst becomes poor, and it will introduce charge traps to generate a large number of electron-hole recombination centers on the surface and bulk phase of the catalyst.
More importantly, the traditional doping method has high energy consumption and needs to be equipped with expensive instruments, which greatly increases the production cost and is not conducive to future industrial production

Method used

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  • Preparation method of boron-doped graphene nano-sheet composite TiO2 photocatalyst
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  • Preparation method of boron-doped graphene nano-sheet composite TiO2 photocatalyst

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Embodiment 1

[0041] 1): Preparation of graphene oxide (GO)

[0042] 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 superna...

Embodiment 2

[0053] A Boron-doped Graphene Nanosheet Composite TiO 2 A method for preparing a photocatalyst, which uses graphene oxide and gas-phase titanium dioxide (P25) as precursors, and uses a combination of low-temperature vacuum reduction and ultrasound to prepare boron-doped graphene nanosheet composite TiO 2 Photocatalyst, specifically comprises the following steps:

[0054] Preparation of Boron-doped Graphene Nanosheets

[0055] Adopt the Hummer method to prepare graphene oxide aqueous solution, measure the above-mentioned prepared graphene oxide aqueous solution with a concentration of 2 mg / ml, disperse it in ultrapure water, ultrasonically disperse for 1 hour, then add boric acid, the weight ratio of graphene oxide to boric acid 0.01:0.4, magnetically stirred for 1 hour and then evaporated to dryness at 60°C. The evaporated sample was then vacuum-reduced at 300°C for 3 hours, redispersed in ultrapure water, and then ultrasonicated for 10 hours, and 1M hydrochloric acid solutio...

Embodiment 3

[0059] A Boron-doped Graphene Nanosheet Composite TiO 2 A method for preparing a photocatalyst, which uses graphene oxide and gas-phase titanium dioxide (P25) as precursors, and uses a combination of low-temperature vacuum reduction and ultrasound to prepare boron-doped graphene nanosheet composite TiO 2 Photocatalyst, specifically comprises the following steps:

[0060] Preparation of Boron-doped Graphene Nanosheets

[0061] Adopt the Hummer method to prepare graphene oxide aqueous solution, measure the above-mentioned prepared graphene oxide aqueous solution with a concentration of 3 mg / ml, disperse it in ultrapure water, ultrasonically disperse for 1 hour, then add boric acid, the weight ratio of graphene oxide to boric acid 0.015:0.4, magnetically stirred for 1 hour and then evaporated to dryness at 60°C. The evaporated sample was then vacuum-reduced at 300°C for 3 hours, redispersed in ultrapure water, and then ultrasonicated for 10 hours, and 1M hydrochloric acid soluti...

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Abstract

The invention relates to a preparation method of a boron-doped graphene nano-sheet composite TiO2 photocatalyst. The preparation method comprises the following steps of: firstly, preparing a boron-doped graphene nano-sheet by adopting a method that vacuum reduction is combined with the ultrasonic; and secondly, directly compositing the P25 with the boron-doped graphene nano-sheet by adopting an ultrasonic mixing method. Compared with the prior art, the boron-doped graphene nano-sheet prepared by using the method has smaller nano-size and better dispersity, and due to the largely exposed edge, the loading of P25 nano particles at the edge of the graphene nano-sheet is facilitated. The boron-doped graphene nano-sheet has strong photoproduction electronic capability and electronic transmission capability; and the prepared novel boron-doped graphene nano-sheet composite P25 photocatalyst has strong photoproduction CO2 capability.

Description

technical field [0001] The invention relates to the field of nano-photocatalytic materials, and prepares a new type of photocatalyst with high photoreduction properties by using cheap and easy-to-obtain P25, graphene oxide and boric acid as raw materials. 2 Performance, Boron-doped Graphene Nanosheets Composite TiO 2 A new approach to photocatalysts. Background technique [0002] Although TiO 2 Has many advantages, but TiO 2 There are also many limitations that cannot be ignored in the application of heterogeneous photocatalysis. TiO 2 The biggest application limitation is that its band gap energy is extremely mismatched with the spectrum of sunlight, TiO 2 It can only absorb ultraviolet light with a wavelength less than 387nm. To overcome TiO 2 This shortcoming of the TiO 2 Research on non-metallic and metal doping to improve its response to visible light has gradually attracted people's attention. However, the doping of traditional metal or non-metal ions will lea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18
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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