The Application of Bi‐Doped TiO 2 for the Photocatalytic Oxidation of Formaldehyde

The photocatalytic oxidation technology has a great potential for the removal of volatile organic compounds (VOCs). In this research, a novel TiO 2 /Bi 2 O 3 catalyst is developed to degrade indoor formaldehyde by the photocatalytic oxidation technology. The TiO 2 /Bi 2 O 3 catalysts with different mass fractions of Bismuth(Bi) are prepared by impregnation method. The characterizations of the TiO 2 /Bi 2 O 3 catalysts by X‐ray diffraction (XRD), ultraviolet–visible (UV–vis) spectrophotometry, and Brunauer–Emmett–Teller analyses suggest that the doping of TiO 2 with Bi neither changes the crystal structure nor the crystal phase of the TiO 2 , but increases the number of mesopores on the TiO 2 /Bi 2 O 3 surface and the specific surface area of the TiO 2 /Bi 2 O 3 . By optimizing such parameters as the flow rate; the concentration; and the relative humidity of formaldehyde, the mass fraction of Bi, and the loading amount of the catalyst, a formaldehyde degradation efficiency as high as 96% is obtained.