Abstract: After loading of TiO₂ on bamboo activated carbon (BAC) through sol-gel method, elements of Pt and N were doped on the composite to produce Pt/N/TiO₂/BAC. N₂ adsorption, XRD, FT-IR and XPS analysis have been used to characterize these samples. Analysis results showed that doping method can reduce the BET surface area and the pore volume; Pt, N co-doping can not change the crystal type, but it is helpful for the scattering of TiO₂ particles on BAC surface; N doping inhibited anatase changing to tutile, but lessened agglomeration; N entered into the TiO₂ lattice, Pt made more active sites and there were oxygen vacancies on the catalyst surface. The photocatalytic degradation of formaldehyde aqueous solution, using TiO₂/BAC, Pt/TiO₂/BAC, N/TiO₂/BAC and Pt/N/TiO₂/BAC respectively, under UV lamp and xenon lamp was also investigated. The results showed that co-doping of Pt and N not only widened the light absorption width but also enhanced photocatalytic activity. The fomaldehyde degradation rae by Pt/N/TiO₂/BAC and 2.6 times of that by TiO₂/BAC under similar conditions Pt/N/TiO₂/BAC had good property of separation.

Key words: bamboo activated carbon, co-doping, Pt/N/TiO₂/BAC, formaldehyde