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Graphene titanium dioxide composite nano material and preparation method thereof

A technology of composite nanomaterials and titanium dioxide, applied in the field of nanomaterials, can solve problems such as difficulty in applying large-scale production, and achieve the effects of good photocatalytic performance, high catalytic degradation efficiency and simple preparation process

Inactive Publication Date: 2018-10-26
NORTHEASTERN UNIV
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Problems solved by technology

[0004] At present, there are many reports on the preparation of graphene-titanium dioxide nanocomposites, and the preparation methods are diverse, but most of these methods rely on the complex control of reaction conditions (for example, high-temperature roasting under protective atmosphere, the addition of acid and alkali solutions and toxic additives, and Operation and control under complex conditions such as light-proof environment), and it is difficult to apply catalytic degradation of organic pollutants and large-scale production in practice

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  • Graphene titanium dioxide composite nano material and preparation method thereof
  • Graphene titanium dioxide composite nano material and preparation method thereof
  • Graphene titanium dioxide composite nano material and preparation method thereof

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preparation example Construction

[0032] This embodiment proposes a method for a graphene-titanium dioxide composite nanomaterial, and the preparation method of the nanocomposite comprises the following steps:

[0033] 1. Weigh a certain amount of dried graphite oxide and dissolve it in an acetone solution, and disperse it ultrasonically for 0.5-1 h to prepare a graphene oxide suspension A with a concentration of 0.001-0.01 mol / L.

[0034] In the process of preparing the graphene oxide suspension A, the improved Hummers method is used to synthesize graphite oxide. The Hummers method is a method commonly used by those skilled in the art to prepare graphite oxide, and will not be described here.

[0035] 2. Add a certain amount of titanate compounds into the alcohol solution, and stir at room temperature for 6-8 hours to prepare titanium dioxide precursor solution B.

[0036] In the process of preparing the titanium dioxide precursor solution B, at least one titanate compound selected from tetrabutyl titanate an...

Embodiment 1

[0045] like figure 1 As shown, embodiment 1 proposes a kind of preparation method of graphene-titanium dioxide composite nanomaterial, specifically comprises the following steps:

[0046] 1. Weigh a certain amount of dry graphite oxide synthesized by the Hummers method, dissolve it in an acetone solution, and disperse it ultrasonically for 0.5-1 h to prepare a graphene oxide suspension A with a concentration of 0.002 mol / L.

[0047] 2. Add a certain amount of tetrabutyl titanate with a mass fraction of 97% into the ethylene glycol solution, the volume ratio of tetrabutyl titanate to ethylene glycol is 0.08:10, stir at room temperature for 7 hours, and prepare titanium dioxide Precursor Solution B.

[0048] 3. Add 3ml of titanium dioxide precursor solution B to the graphene oxide suspension A, mix well, let stand for several hours, and then centrifuge the precipitate to obtain the precipitate.

[0049] 4. After adding 15ml of deionized water to the precipitate, transfer it to t...

Embodiment 2

[0054] Embodiment 2 proposes a kind of preparation method of graphene titanium dioxide composite nano material, specifically comprises the following steps:

[0055] 1. Weigh a certain amount of dry graphite oxide synthesized by the Hummers method, dissolve it in an acetone solution, and disperse it ultrasonically for 1 hour to prepare a graphene oxide suspension A with a concentration of 0.005 mol / L.

[0056] 2. Add a certain amount of tetrabutyl titanate with a mass fraction of 97% to the ethylene glycol solution, the volume ratio of tetrabutyl titanate to ethylene glycol is 0.13:10, and stir at room temperature for 6 hours to prepare titanium dioxide Precursor Solution B.

[0057] 3. Add 6ml of titanium dioxide precursor solution B to graphene oxide suspension A, mix well, let stand for several hours, and then centrifuge the precipitate to obtain the precipitate.

[0058] 4. After adding 15ml of deionized water to the precipitate, transfer it to the reaction kettle and seal...

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Abstract

The invention discloses a graphene titanium dioxide composite nano material and a preparation method thereof. The preparation method of the graphene titanium dioxide composite nano material includes the steps of: dissolving graphite oxide prepared by a Hummers method in an acetone solution, and conducting ultrasonic dispersion to prepare graphene oxide suspension A; adding a titanate compound to an alcohol solution, and stirring at room temperature to prepare a titanium dioxide precursor solution B; adding the titanium dioxide precursor solution B into the graphene oxide suspension A to be evenly mixed and stand still, and performing centrifugal separation of precipitates to obtain the precipitates; adding deionized water to the precipitates, and cooling to room temperature after hydrothermal reaction is over to obtain reaction liquid C; separating products from the reaction liquid C by centrifugation, carrying out ultrasonic dispersion, washing, conducting separation and precipitation, and drying the precipitates to obtain the graphene titanium dioxide composite nano material. The preparation method of the graphene titanium dioxide composite nano material has the advantages of being simple, suitable for large-scale production, and capable of performing one-step synthesis of the graphene titanium dioxide nano composite material with high specific surface and good photocatalyticproperties by a hydrothermal method under mild conditions.

Description

technical field [0001] The invention belongs to the field of nanomaterials, and relates to a graphene-titanium dioxide composite nanomaterial and a preparation method thereof. Background technique [0002] Titanium dioxide semiconductor materials are widely used in solar energy conversion and pollutant treatment due to their high oxidation ability, non-toxicity, stable chemical properties and reusable properties, and have great applications in the field of photocatalysis. It has a good effect on the degradation of organic dyes. However, the high photogenerated electron-hole recombination rate greatly reduces its photocatalytic activity and degradation efficiency. To solve this problem, people have done a lot of work, and one of the main ways is to combine with other semiconductor materials or carbon materials. [0003] As a new type of two-dimensional structured carbon material, graphene has excellent electrical, thermal and mechanical properties, and has been widely studi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18B01J35/00B01J35/02B01J35/10B01J37/10
CPCB01J21/18B01J37/10B01J35/40B01J35/615B01J35/39
Inventor 付海涛李武发杨晓红安希忠张浩贾倩弓梦丽吴镇湘
Owner NORTHEASTERN UNIV
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