Bismuth tungstate synthesized by hydrothermal synthesis has three bismuth tungstate forms: rod-shaped bismuth tungstate, flower-shaped bismuth tungstate, and flower-shaped bismuth tungstate. Among them, the experiment proves that rhodamine B solution is used as the degradation solution, and by measuring its ultraviolet absorption spectrum, it is found that the photocatalytic activity of the spherical bismuth tungstate is the strongest. Then three composite photocatalysts were sequentially synthesized: graphene oxide/spherical bismuth tungstate, graphene/spherical bismuth tungstate, multi-walled carbon nanotubes/spherical bismuth tungstate. Also using rhodamine B solution as the degradation solution, by measuring its ultraviolet absorption spectrum, it was found that the spherical bismuth tungstate/graphene (rGO) composite photocatalyst had the best degradation effect on rhodamine B solution.
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