The Preparation Of Fixed TiO₂ Film And Application In Gas-phase Photocatalytic Degradation Of Formaldehyde

Treating the deleterious gas is an important field with practical value. Based on reviewing the preparation methods of TiO2 and the photodegradation of volatile organic chemicals (VOCs), the preparation of TiO2 film and the photodegradation of formaldehyde were studied systematically in this paper. The results showed that the technology was in possession of the prominent virtues, such as simple processing equipment, operation conditions controlled easily, pollutants degraded effectively, no secondary pollution, etc. So it can provide new strategy and pathways for industrialization treatment of VOCs and will be endowed with extensive application prospect in the self-cleaning or indoor air cleaning.The fixed titanium dioxide films on the glass were prepared by sol-gel process. The influences of solution composition, coating times, and sintering temperature on the catalytic performance were investigated. The glass pipes were dip-coated with the sol composition of Ti(OC4H9)4: CH3CH2OH: CH3COCH3COCH3: PEG400=l: 46.9: 1: 0.085 (molar ratio), and then calcinated at 400℃ for two hours. This process was repeated two times. The obtained fixed dioxide film on the glass pipes showed rather good photocatalytic performance, which was higher than coated TiO2 (P25) for the degradation of formaldehyde. The excellent stability of the fixed titanium dioxide film on the glass pipes was obtained.The TiO2 films were modified by transition metal ions of Ni2+, Mn2+, Cr3+, Co2+, Cu2+, Fe3+, and Cd2+ with different concentration for examining the properties of photocatalytic activity and utilization of visible light. The modified TiO2 films were prepared by dip-coated two times with the sol composition of titanium butoxide: ethanol: acetyl...