2020年9月15日星期二

Graphene, Bismuth Tungstate, Titanium Oxide

Bismuth tungstate is a popular new visible light catalyst, especially petal shaped bismuth tungstate.

It has good light absorption and high stability, and has broad application prospects in the field of photocatalysis.

The scholars in our country believe that the proper doping of bismuth tungstate, the preparation of semiconductor compound and assistant modification are effective ways to improve the photocatalytic property of bismuth tungstate.

treatment of methyl wastewater image

In recent years, graphene has brought tremendous changes to the material industry because of its unique two-dimensional structure, large specific surface area and high electron transmission rate. It has been recognized as the "king of new materials", Chinese scholars believe that graphene as an efficient electronic additive, and Bi2WO6 composite catalyst, will greatly improve its light capture electronic capabilities, thereby enhancing catalytic capacity. However, scholars believe that only graphene is not enough, and the number of photocatalytic holes will also be increased to improve the cavity manufacturing capacity of bismuth tungstate.

In the photodegradation process, the main active species, HO, is obtained by the reaction of holes and H2O. In recent years, adding cavity additives into photocatalyst is a popular method. Amorphous oxide amorphous TiOis a common assistant, and TiO2 is also a photocatalyst. It is found that the amorphous TiO2 film can be applied to the surface of BiVO4 and GaAs electrodes to transfer the photogenerated cavity rapidly.

With bismuth tungstate (Bi2WO6) as the main catalyst, graphene (rGO) is an electron assistant, and TiO2 (TIO2) is a hole assistant, three Musketeers combined to degrade methyl wastewater. Ti (IV) -rGO/Bi2WO6 has been prepared by hydrothermal impregnation deposition method to degrade methylene orange. The test concluded that the catalytic rate of composite catalyst are pure Bi2WO6, Ti (IV) Bi2WO6 / rGO/Bi2WO6, 88 times, 67 times and 17 times, enhance the photocatalytic performance is mainly due to the Ti (IV) and rGO double additive synergistic effect, rapidly capture and transfer of photogenerated holes and electrons promote separation between them, thus effectively reducing the recombination of photogenerated carriers.

From the cost point of view, bismuth tungstate is the most expensive, followed by graphene, titanium dioxide is the cheapest, they reduce the use of bismuth tungstate, cost a great deal of medicine, and the effect is greatly increased. Therefore, the use of new additives to modify the photocatalytic materials will be most likely to become mainstream methods in the future.

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