Grading three-dimensional porous graphene/titanium dioxide photocatalyst and preparation method thereof

A titanium dioxide, three-dimensional porous technology, applied in the fields of environment and energy, can solve problems such as affecting the performance of photocatalyst materials, and achieve the effect of enhancing effective contact area, adsorption performance and photocatalytic performance, and enhancing adsorption performance and photocatalytic performance.

Inactive Publication Date: 2014-10-01
WUHAN UNIV OF TECH
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Problems solved by technology

However, due to the strong π-π bonds of graphene nanosheets, hydrophobic interface and van der Waals force in two-dimensional graphene materials, graphene nanosheets will partially agglomerate and overlap, thus sacrificing part of the two-dimensional graphene interface structure, Thus affecting the performance of photocatalyst materials

Method used

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  • Grading three-dimensional porous graphene/titanium dioxide photocatalyst and preparation method thereof
  • Grading three-dimensional porous graphene/titanium dioxide photocatalyst and preparation method thereof
  • Grading three-dimensional porous graphene/titanium dioxide photocatalyst and preparation method thereof

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Embodiment 1

[0031] The present embodiment provides a kind of preparation method of hierarchical three-dimensional porous graphene / titania photocatalyst, it comprises the following steps:

[0032] 1) Use the Hummers method to prepare graphite oxide, dissolve graphite oxide in deionized water, and ultrasonically obtain a graphene oxide aqueous solution with a concentration of 3 mg / ml for 2 hours;

[0033] 2) Add 7.95g of hexadecylamine to an aqueous solution of 800ml of absolute ethanol and 3.20ml of potassium chloride (0.1M), sonicate for 10 minutes, and slowly drop 18.10ml of isopropyl titanate into the mixed solution under vigorous stirring , reacted for 18 hours, filtered the reaction solution, then repeatedly washed 3 times with ethanol, and dried to obtain a titanium dioxide precursor;

[0034] 3) Dissolve 0.50g of titanium dioxide precursor in 10ml of ethanol, ultrasonically disperse for 10 minutes, then add 50ml of graphene oxide solution (3mg / ml) and 500μl of ammonia water in turn ...

Embodiment 2

[0041] The present embodiment is roughly the same as Example 1, except that the volume of the potassium chloride aqueous solution in step 2) is 5.49ml, i.e. H 2 When the molar ratio of O:Ti is 5:1: the particle size of titanium dioxide nanoparticles gradually decreases with the increase of water content. Due to the stretchability of the three-dimensional graphene skeleton, its coating structure still makes its photocatalytic efficiency higher than that of P25.

Embodiment 3

[0043] This embodiment is roughly the same as Example 1, except that the quality of hexadecylamine in step 2) is: 3.975g, that is, the molar ratio of hexadecylamine:titanium is reduced from 0.5:1 in Example 1 to 0.25 : 1, part of the titanium dioxide nanoparticles began to bond together, and three-dimensional graphene pore structure to form a coating, photocatalytic performance similar to Example 1.

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Abstract

The invention provides a grading three-dimensional porous graphene/titanium dioxide photocatalyst and preparation method thereof. The photocatalyst is composed by a three-dimensional grapheme framework and nano titanium dioxide particles; the grahene is provided with a macroporous structure; titanium dioxide is mesoporous titanium dioxide; the macropores and the mesopores are communicated; the nano titanium dioxide particles are scattered on a grapheme nano sheet; the surfaces of nano titanium dioxide microspheres are wrapped with graphene nano sheets; the macropores of the graphene are filled with the nano titanium dioxide microspheres. The photocatalyst with a three-dimensional structure can not only prevent the graphene sheet layers from stacking, but also scatter titanium dioxide particles excellently, and is high in specific surface area; besides, samples can be used for photocatalysis degradation of methylene blue, and the methylene blue can be fully degraded in 25 minutes. The preparation method provides a new thought for preparation of the photocatalyst, and has a potential application value in the fields of energy sources and environment.

Description

technical field [0001] The invention relates to the fields of environment and energy, in particular to a hierarchical three-dimensional porous graphene / titanium dioxide photocatalyst and a preparation method thereof. Background technique [0002] Titanium dioxide (TiO 2 ) Semiconductor photocatalysts are widely used in the degradation of organic dyes and photocatalytic water splitting. Since the 1970s, they have received a research boom at home and abroad. However, TiO 2 The bottleneck in the development of photocatalysts lies in the low effective absorption efficiency of light and the easy electron-hole recombination. thus resulting in TiO 2 The photocatalytic life is short and the photocatalytic activity is not high. In order to overcome the above defects, in recent years, researchers at home and abroad have combined two-dimensional graphene materials with TiO 2 compound to form a composite material to improve its photocatalytic performance. Two-dimensional graphene ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18
Inventor 阳晓宇卢毅张晓平苏宝连
Owner WUHAN UNIV OF TECH
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