Preparation and Photocatalytic Properties of Graphene/Carbon Nanotubes/Bismuth Molybdate Composites
Bi2MoO6 has a typical Aurivillius type structure with appropriate band gap energy(2.7 eV),which can cap-ture visible light and has excellent photocatalytic performance.However,photogenerated charge carriers are easy to re-combine on the catalyst surface,resulting in low quantum efficiency.Using bismuth nitrate pentahydrate(Bi(NO3)3·5H2O),sodium molybdate dihydrate(Na2MoO4·2H2O),graphene oxide(GO)and carbon nanotubes(CNTs)as raw materials,the graphene/carbon nanotube/bismuth molybdate composite photocatalytic materials were prepared by general hydrothermal method,and Rhodamine B was photocatalyzed.The morphology,crystal structure and photocatalytic prop-erties of the prepared samples were characterized by scanning electron microscopy(SEM),X-ray diffractometer and UV-VIS spectrophotometer.The results show that appropriate amount of carbon nanotubes greatly improve the specific surface area of the composite powder and effectively promote the photocatalytic degradation of Rhodamine B.At the same time,the optimal hydrothermal reaction temperature is determined to be 120℃.Too high hydrothermal temperature will cause the growth of bismuth molybdate grains,which is not conducive to the photocatalytic performance.
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