Three-dimensional graphene and nanometer titania composite photocatalyst and preparation method thereof

A nano-titanium dioxide and graphene technology, applied in the field of nanomaterials and photocatalysis, can solve the problems of uncontrollable morphology, weak interaction, cumbersome process flow, etc. Effect

Inactive Publication Date: 2016-09-21
广州东铝轻合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, further studies have shown that graphene is laminated and irreversibly agglomerated during the preparation process, and it is difficult to obtain monodisperse graphene; the interaction between catalyst nanoparticles and the support is weak, and graphene will inevitably agglomerate together. TiO2 nanoparticles-modified graphene sheets are in aggregated state
In this way, the huge specific surface area of ​​graphene cannot be fully utilized, and the synergistic catalytic effect of the composite cannot be fully exerted.
In addition, the prepared nano-titanium dioxide particle size and shape are uncontrollable, poor dispersion and stability on the carrier and other shortcomings, and its process is relatively cumbersome, and it is difficult to adapt to large-scale batch industrial applications

Method used

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  • Three-dimensional graphene and nanometer titania composite photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Clean the nickel foam of 10mm*10mm*1mm with dilute hydrochloric acid, acetone and absolute ethanol in sequence, then wash it with deionized water and dry it.

[0026] (2) Put 10 mg of graphene oxide prepared by the Hummers method in a beaker filled with distilled water, and sonicate in an ultrasonic instrument to obtain a concentration of 5 mg·ml -1 graphene oxide aqueous solution.

[0027] (3) Soak the nickel foam treated in step (1) directly into a 20ml graphene oxide aqueous solution beaker, and then sonicate and soak to finally form a three-dimensional graphene oxide material. During the ultrasonic immersion process, the reaction temperature is 40°C, the frequency is 40KHz, ultrasonic is used for 20 minutes, the interval is 5 minutes, and the ultrasonic immersion is performed for another 20 minutes. The total ultrasonic immersion time is 2 hours.

[0028] (4) Dry the prepared three-dimensional graphene oxide material, and then raise the temperature to 480°C in ...

Embodiment 2

[0031] (1) Clean the nickel foam of 10mm*10mm*1mm with dilute hydrochloric acid, acetone and absolute ethanol for 12 minutes, then wash it with deionized water for 5 minutes and then dry it.

[0032] (2) Put 10 mg of graphene oxide in a beaker filled with distilled water and sonicate in an ultrasonic instrument for 2 hours to obtain a concentration of 3 mg·ml -1 graphene oxide aqueous solution.

[0033] (3) Soak the nickel foam treated in step (1) directly into a 20ml graphene oxide aqueous solution beaker, and then sonicate and soak to finally form a three-dimensional graphene oxide material. During the ultrasonic immersion process, the reaction temperature was 70°C, the frequency was 40KHz, ultrasonic was used for 20 minutes, and the interval was 5 minutes, followed by ultrasonic immersion for another 20 minutes. The total ultrasonic immersion time was 3 hours.

[0034] (4) Dry the prepared three-dimensional graphene oxide material, and then raise the temperature to 450°C i...

Embodiment 3

[0037] (1) Put 10 mg of graphene oxide in a beaker filled with distilled water and sonicate in an ultrasonic instrument to obtain a concentration of 6 mg·ml -1 graphene oxide aqueous solution.

[0038] (2) Soak 10mm*10mm*1mm nickel foam directly into a 20ml graphene oxide aqueous solution beaker, and then ultrasonically soak to form a three-dimensional graphene oxide material. During the ultrasonic immersion process, the reaction temperature was controlled at 80°C, the frequency was 40KHz, the ultrasound was performed for 20 minutes, and the interval was 5 minutes, followed by another 20 minutes of ultrasound. The total ultrasonic immersion time was 1 hour.

[0039] (3) Dry the prepared three-dimensional graphene oxide material, and then raise the temperature to 500°C at a rate of 4°C / min under vacuum in a tube furnace, and take it out after holding for 2 hours.

[0040] (4) Dissolve 0.50ml of HCl and 0.4ml of titanium tetrachloride in 30ml of absolute ethanol in turn, and st...

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Abstract

The invention relates to a three-dimensional graphene and nanometer titania composite photocatalyst and a preparation method thereof. The method comprises the following steps that 1, a 1.0 mg/mL-10.0 mg/mL aqueous graphene oxide solution is prepared; 2, nickel foam is taken and soaked in the aqueous graphene oxide solution, ultrasonic treatment is conducted, a nickel foam material loaded with graphene oxide is prepared, the material is dried, and a three-dimensional graphene oxide material is obtained; 3, haloid acid and titanium tetrachloride are sequentially dissolved in absolute ethyl alcohol, the three-dimensional graphene oxide material obtained in the second step is soaked in the solution, a reaction is conducted under the condition of 100 DEG C to 200 DEG C, heat preservation is conducted for 1 h to 6 h, cooling, separating, cleaning and drying are conducted, and the three-dimensional graphene and nanometer titania composite photocatalyst is obtained. The method inhibits lamination and irreversible agglomeration of graphene in the preparation process and greatly increases the specific surface area of graphene and the electron transmission rate, the size and morphology of obtained nanometer titania are controllable, and the photocatalytic effect of the photocatalyst is improved.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and photocatalysis, and relates to a three-dimensional graphene-nano titanium dioxide composite photocatalyst and a preparation method thereof. Background technique [0002] Among various semiconductor photocatalysts, TiO 2 Due to its strong oxidation ability, good light-induced superhydrophilicity, non-toxicity and long-term photochemical stability, it has important application prospects in environmental purification, but TiO 2 There is a defect in its own nature, that is, its forbidden band is wide, and the amount of ultraviolet light absorbed is very small, accounting for only about 4% of sunlight. In addition, its carriers are extremely prone to recombination on the surface of the catalyst, and the defects of the material itself hinder its practical application as a photocatalytic material. Nano TiO 2 It is not easy to recycle, so the preparation of TiO with good photocatalytic activi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18B01J21/06
CPCB01J21/063B01J21/18B01J35/004
Inventor 冷金凤单光乐张少辰王艳周国荣陈广立赵松方
Owner 广州东铝轻合金有限公司
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