非金属离子掺杂对二氧化钛光催化降解有机染料的研究进展

Research Progress of Non-metal Ion Doped TiO_(2) for Photocatalytical Degradation of Organic Pollutants

二氧化钛(TiO_(2))是一种具有高化学稳定性、环境友好型和低毒性的半导体材料,广泛地应用于催化、传感、制氢、光学和光电等领域。然而作为光催化剂的二氧化钛存在带隙较宽、对太阳光的利用效率低等缺陷。通过对TiO_(2)改性,能增加晶体表面的活性位点或抑制光生载流子的复合,可以达到提高其光催化效率的目的。研究表明,将非金属离子掺杂到TiO_(2)的晶格中,可以减慢电子-空穴对的复合速率,是一种提高纳米TiO_(2)光催化活性的有效改性途径。讨论了非金属离子掺杂TiO_(2)的改性机理和使用非金属离子改性后的Ti O_(2)光催化剂降解常见有机污染物的最新进展,并对TiO_(2)光催化剂的改性前景做出展望。

Titanium dioxide(TiO_(2))is a semiconductor material with high chemical stability and low toxicity.It is widely used in the fields of catalysis,sensing,hydrogen production,optics and optoelectronics.However,as a photocatalyst,TiO_(2)has defects on the respect of the wide band gap and low utilization efficiency of sunlight.By modifying treatment,the active sites on the TiO_(2)crystal surface can be increased or the recombination of photo-generated carriers can be inhibited,which can achieve the purpose of improving its photocatalytic efficiency.Studies have shown that doping non-metal ions into the lattice of TiO_(2)can slow down the recombination rate of electron-hole pairs,which is an effective way to improve the photocatalytic activity of Nano-TiO_(2).In this paper,the modification mechanism of non-metal ion-doped TiO_(2)was analyzed.The latest progress in using non-metal ion-modified TiO_(2)photocatalyst to degrade common organic pollutants was introduced.The prospects for the modification of TiO_(2)photocatalyst were also discussed.