Bismuth tungstate is a kind of tungstate, its appearance is white powder, and its chemical formula is Bi2WO6. It is a visible light semiconductor photocatalyst that has attracted a lot of attention. Under the action of sunlight, the electrons of bismuth tungstate undergo transitions due to light excitation and generate corresponding holes, thereby forming electron-hole pairs, and the generated electron-holes are in redox The effect is extremely obvious, and it can effectively react between organic matter and high molecular polymers, and then achieve the effect of degradation.
The main synthesis methods of bismuth tungstate are: hydrothermal (solvothermal) method, hydrothermal-roasting method, ultrasonic-assisted method, microwave-assisted method, electrochemical method, sol-gel-roasted method, etc. Different preparation directions and conditions may produce different crystal forms of bismuth tungstate.
The crystal forms of bismuth tungstate mainly include: nano hollow microspheres, nano flower microspheres, nanobelts, nanosheets, and nanoparticles. Among them, the photocatalytic performance of nanoflower-like microspheres is the most prominent.
As a new type of photocatalyst, bismuth tungstate has the following characteristics:
(1) Good UV and visible light response;
(2) Easy to modify and modify;
(3) The photocatalytic effect is stable;
(4) The cost is relatively low;
(5) Environmentally friendly
Bismuth tungstate can treat a wide range of sewage. Bismuth tungstate photocatalyst can degrade dye wastewater, alcohol wastewater, industrial wastewater, saccharin wastewater, pharmaceutical wastewater and other complex pollutants, and has the characteristics of rapidity and high efficiency. In addition, tungstic acid Bismuth can also enhance and improve photocatalytic properties by compounding titanium, silver, graphene and other elements, but its most important advantage is that it is an environmentally friendly green technology that will not cause secondary pollution to the environment, making people Live in harmony with nature.
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