| Formaldehyde (HCHO) is a major indoor air pollutant in houses. Its potential danger makes people studying on it. As we know, TiO2 which is one of the most basic materials has very high efficiency in degrading formaldehyde. Now, the study on degradation of formaldehyde by TiO2 is very popular, because of its stability,high-efficiency,inncouity etc. But how can we bring that effective photo catalyst into our daily life, obviously, fixing TiO2 on film is not only contains the efficiency of it, but also can be reused convenient.Three materials are used for dip-coating in this experiment: glass, fiberglass, stainless steel net. All of them are very important in our daily life, like fan, air-conditioner, curtain, lamp-chimney and so on. The photocatalytic reactor was designed by myself, it's a column of stainless steel which has a observe windows on the top of the cover. Through the contrastively experiment, we can find the best condition of each material degrading the formaldehyde.The fixed titanium dioxide films on the glass were prepared by sol-gel process. The reactor is designed by myself which is made up of stainless ion. It is about 100L. And there is a bracket inside the reactor which is upholding UV light and the thin film, a fan under the bracket. The best thin film is stainless steel ion, Which is coated 3 times, calcined 30-60min in. Glass fiber'best efficiency is about 84%, which is coated 3 times, calcined 30 min in 500℃. But it's hard to control the production of thin film. Glass thin film can degrade 80% formaldehyde. Otherwise the UV wave doesn't make differcence, but the density of UV light, can affect the degradation. After all, we found that the 60-stainless steel net with 3 coating times,500℃calcine for 30-60 minutes can make the highest efficiency of all these materials.
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