Bismuth Tungstate / Expanded Graphite Composite Photocatalyst

The light response of bismuth tungstate is good, but in practice, it usually needs modification. Some researchers have used graphite loaded bismuth tungstate to make composite materials. The preparation process is as follows:

Bismuth nitrate, sodium tungstate and expanded graphite are added to the deionized water to be stirred and then transferred to the reaction kettle for thermal insulation under the hydrothermal condition, and then washed, washed, dried and grinded, that is, the bismuth tungstate / expanded graphite lamellar nanostructure composite material is obtained. The composite material is used as the carrier of the expanded graphite nanoscale. The surface of the expanded graphite is loaded with bismuth tungstate.

The expanded graphite as a carrier can not only promote the effective dispersion of the bismuth tungstate, but also make full use of the template effect provided by the expanded graphite to control the particle size of a single bismuth tungstate particle, and then the prepared small particle size bismuth tungstate can be loaded on his clay carrier. Load up and avoid reunion.

The advantages of bismuth tungstate / expanded graphite composite photocatalyst are that the conductivity of the graphite can transfer the optical carrier to avoid recombination, thus improving the photocatalytic activity of the bismuth tungstate / expanded graphite lamellar nanostructure composite, and the porous structure of the expanded graphite and the strong adhesion property can maintain the Bi suspension system of the bismuth tungstate. The photocatalytic efficiency of the composite is higher than that of pure bismuth tungstate. The experimental results show that the removal rate of methylene blue by bismuth tungstate / photocatalyst is about 70%, while the removal rate of methylene blue by bismuth tungstate / expanded graphite composite photocatalyst is over 97%.

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