2019年10月23日星期三

The PK Between Tungsten Trioxide and Titanium Dioxide Photocatalytic Performance

Photocatalysis is a photochemical reaction in the presence of a catalyst, it is a new science and technology.

Common photocatalysts include metal oxides (TiO2, ZnO, Fe2O3, Bi2O3, WO3) and metal sulfides (CdS, MoS2, MoSe2). Titanium dioxide TiO2 is the most white thing in the world, 1 grams of titanium dioxide can paint more than 450 square centimeter area to white. So it's the best paint for making white oil paint. The most well-known is that semiconductor photocatalysis performance of TiO2. TiO2 photocatalysis is widely used because of its high activity, photochemical stability, non-toxic and cheap.

Tungsten trioxide TiO2 is a kind of tungsten compounds that are widely used, It can be used not only for hard alloys, but also for dyes, the most commendable thing is that tungsten trioxide also with excellent photocatalytic performance. Like TiO2, WO3 also has high activity, photochemical stability, non-toxic and so on. If you compare the two, who can be better?

tungsten trioxide and titanium dioxide image

According to the data, TiO2 was the first compound to enter the field of photocatalysis, in 1972, the Japanese discovered that light irradiated TiO2 particles could cause water to undergo a sustained redox reaction, and began the history of photocatalysts. For a long time, TiO2 has been the preferred material for photocatalysis. Until 1983, the scholars in China used WO3 to treat printing and dyeing wastewater for the first time, and achieved very good results. Since then, WO3 has been discovered in application field and application, and gradually catch up from behind, outshining TiO2. How can WO3 compete with TiO2?

TiO2 was used as photocatalyst for a long time. But there are two fatal problems with the performance of TiO2, first, TiO2 has a narrow range of absorption of sunlight, which limits its use of solar energy. Second, photocatalytic reaction efficiency is low, generally not greater than 1%. With the increasingly serious problem of environmental water pollution, TiO2's capacity is too poor, TiO2's weaknesses are the strengths of WO3. From the performance point of view, the activity of WO3 photocatalytic degradation on organic pollutants is higher, the absorption and utilization on sunlight is better.

Tungsten trioxide has better chemical compatibility, WO3 can be mixed with ZnO, Bi2O3, rare earth La, Eu, Y and other elements to form a tungstate photocatalyst, not only pollution control, but also classify the printing and dyeing wastewater, antibiotic wastewater, metal wastewater targeted governance. Therefore, ignoring the price factor, the performance of WO3 undoubtedly has stronger competitiveness.

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