表面键合型CO_3^(2-)/TiO_2光催化剂的性能表征

Performance Characterization of Surface CO_3^(2-) Bonded TiO_2 Photocatalyst

以碳酸铵和溶胶-凝胶法制备的TiO2干凝胶为原料,采用机械研磨-热处理法制备表面键合型CO2-3/TiO2光催化剂,并对样品的晶相组成、比表面积、光吸收性能、表面化学状态和表面光生载流子的分离效率等性质进行表征.此外,以气相的丙酮为模型污染物,考察催化剂在紫外光(λ≈365nm)照射下的光催化性能.结果表明:CO2-3/TiO2光催化降解丙酮的转化率和矿化率分别为82%和100%,与纯TiO2相比,其转化率和矿化率分别提高了105%和61%.

Surface CO2/3--bonded TiO2 was synthesized by a mechanical milling method followed by thermal treatment, u- sing ammonium carbonate and TiO2 xerogel 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 ultraviolet light （）,~365 nm） irradiation. The results show the conversion rate and mineralization rate of acetone over the CO2/3--bonded TiOe were up to 82% and 100%, respectively, which were correspondingly improved by 105% and 61%compared with those on the pure Ti02.