Wastewater Nemesis -- Bismuth Tungstate
In recent years, photocatalytic degradation technology has been paid more and more attention to the treatment of environmental pollution.
Photocatalytic treatment of pesticide wastewater is considered to be an ideal method from energy consumption and effect. The tungstate photocatalyst is well received by people for its energy saving, high efficiency, easy operation, wide application range, thorough degradation of pollutants and no secondary pollution.
Bismuth tungstate is also a kind of tungstate. Since 1999, it has been reported that bismuth tungstate Bi2WO6 has photocatalytic activity after visible light radiation at wavelengths greater than 420 nm. Bi2WO6 can be excited by visible light and has a high catalytic activity under visible light due to its narrow bandgap width (about 2.7eV) and become a new addition to photocatalytic materials.
Some scholars have found in the visible light response Bi2WO6 can effectively degrade harmful substances such as chloroform and acetaldehyde, it must known that chloroform and acetaldehyde are notorious toxic pollutants, which are stored in waste water. If they flow into rivers, lakes and seas, they can cause irreversible damage to the ecological environment. Fortunately, the study of Bi2WO6 photocatalytic materials opens up a new way for photocatalytic removal and degradation of organic pollutants such as chloroform and acetaldehyde, and has very important practical value in environmental purification.
In addition, bismuth tungstate is also used to degrade the trouble with methyl dye wastewater. Methyl orange, for example, is a complex dye compound of azo and quinone structures in acid and alkaline conditions, is hard to remove, but bismuth tungstate can neat and quick to cut the Gordian knot, the methyl orange degradation was obedient. It has been proved that under acidic pH value, Bi2WO6 is highly targeted to methyl dyes and can achieve almost 99% photocatalytic degradation efficiency.
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