Surface CO32-bonded TiO2 was synthesized by a mechanical milling method followed by thermal treatment,using ammonium carbonate and TiO2xerogel prepared by a sol-gel method as starting materials.Characterizations were carried out to determine crystalline composition,specific surface area,optical absorption property,surface chemical states and separation efficiency of photoinduced carriers on catalysts.The photocatalytic activity of the samples was determined by the degradation of gas-phase acetone under ultr...