This paper researched the effect of degradation of formaldehyde by the Ti02 powder doped with iron and nitrogen.Using triethylamine as nitrogen source,Ti02 powder doped with nitrogen(N-Ti02) were synthesized by TiCl4.Ti02 powder codoped with iron and nitrogen(Fe/N-Ti02) was prepared by adsorption-deposition of Fe3+ on N-Ti02 powder and heat treatment.The photodegradation of formaldehyde was used as model reaction to evaluate the effect of degradation of formaldehyde of different catalysts,the photosource,th...