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

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...

AI Technical Summary

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

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