The photocatalytic activity of all N-doped TiO2 can be arranged in the following order: TiO2/diethanolamine > TiO2/triethylamine > TiO2/urea > un-doped TiO2. The initial rate of 2-chlorophenol degradation using the interstitial N-doped TiO2 with diethanolaminewas 0.59mg/L-min and the kinetic constant was 2.34×10−2 min−1 with a half-life of 98 min. In all cases, hydroquinone was detected as a major intermediate in the degradation of 2-chlorophenol.