【摘要】 通过对近年来TiO2光催化活性及其在环境保护领域的最新进展的研究,进一步探讨了提高TiO2光催化活性的新方法和新途径以及TiO2在降解水及空气污染物等方面出现的新问题。结果表明,金属离子掺杂给TiO2提供电子受体,可降低电子与空穴的复合;表面贵金属沉积降低了TiO2的带隙宽度,能形成更多的电子-空穴对;表面光敏化利用敏化剂在可见光下有较大激发因子的特性,可扩大激发波长范围;复合半导体之间的能级差别能使电荷有效分离,有利于发生电子转移,延长电子-空穴对的寿命。在TiO2对水及空气污染物的光催化降解中,一般原始物质的去除十分迅速,但并非所有污染物最终都能达到完全矿化,其光催化降解效率仍有待进一步提高。更多还原

【Abstract】 The new methods and the new techniques of enhancing the TiO2 photocatalytic activity and the new problems of removing the contamination in water and in air are discussed in detail.Recent studies on these fields indicted that the metalionadulteration can provide electronacceptor and decrease the recombination,the noble metal sediment can debase the gap of energy band and increase the amount of electronhole,the photosensitization can enlarge the region of light wave,and the complex semiconductor can separate the charges effectively and prolong the life of electronhole.The photocatalytic removal of primordial contamination in water and in air had been removed fast by TiO2,but the contamination had not been mineralized entirely.The efficiency of photocatalytic removal of TiO2 must be father enhanced.更多还原