Bismuth Tungstate Photocatalyst Modification
In recent years, because bismuth tungstate (Bi2WO6) has narrower band gap and wider visible range than titanium dioxide (TiO2), it has a great tendency to replace TiO2.
However, in practical applications, it was found that bismuth tungate is good, but there are some shortcomings, mainly in its photogenerated electrons and holes easy to complex, quantum efficiency is not high. Therefore, scholars believe that bismuth tungstate should be added with some elements to excite the photocatalytic potential of bismuth tungstate.
Some scholars have made Au (Ag) / Bi2WO6 nanocomposites with bismuth tungstate doped with gold or silver. The results show that the degradation efficiency of RhB solution is 40% using Au (Ag) / Bi2WO6 nano photocatalyst, and the efficiency is 99.2%, higher than that of pure Bi2WO6.
Some scholars have suggested that the Pt/Bi2WO6 composite can be used for photocatalytic degradation of Mo methyl orange by doping bismuth with platinum. The results show that the photocatalytic activity of Mo solution is reduced to 100% by using 0.3Pt/ Bi2WO6 composite photocatalyst, and the photocatalytic activity of the photocatalyst is still active and recyclable.
It is said that the nano crystalline Bi2WO6 powder is mixed with a small amount of TiO2 powder and is hydrothermally mixed. The structure of the photocatalyst is still Bi2WO6 crystal structure, however, the properties of the two compounds show good visible light response range and catalytic activity.
Of course, if you think the doped TiO2 material is too low, then change to the king of new material graphene, it is found that graphene is an excellent conductor, and graphene, as an efficient electron promoter, can be combined with Bi2WO6 catalyst to increase its light capture capability and enhance its catalytic capability. The results show that rGO/Bi2WO6 has a catalytic effect on dye wastewater. The decolorization rate is 92%, which is about 30% higher than that of pure bismuth tungstate.
Recently, some scholars have proposed a more comprehensive doping scheme, which is based on bismuth tungstate as the main catalyst and doped graphene and titanium dioxide. TiO2 assisted Bi2WO6 to generate more holes, and graphene assisted Bi2WO6 to capture electrons. By combining, the potential of bismuth tungstate is fully activated. It not only has a photocatalytic rate of 99% of methyl waste water, but also has strong degradation ability to pesticide wastewater and organic wastewater.
With the development of bismuth tungstate photocatalyst, more bismuth tungstate photocatalytic activity will be improved in the future. In addition, another point to mention is that by chemical methods bismuth tungstate in polyester or acrylic fiber load, it is more favorable for the recovery and reuse of bismuth tungstate photocatalyst in practice.
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