摘要
TiO_2以其优异的光催化活性和化学稳定性而备受关注,但是3.2e V的禁带宽度极大地限制了其实际应用范围和效果,因此寻找可有效拓宽TiO_2可见光吸收范围的方法和策略始终是目前的研究热点之一。利用金属-有机配合物独特的共轭结构,可以有效改善二氧化钛的吸光特性,但目前研究和应用较多的是Ru-有机配合物,该类配合物具有一定毒性且生产成本较高。本文用廉价易得的过渡金属铁-吡啶/氮菲配合物与TiO_2结合,得到了一系列可在可见光下高效降解有机污染物苯酚的复合光催化剂,通过深入研究结合理论计算,揭示了配合物在TiO_2表面锚定基团的数量和配合物共轭结构对配合物与TiO_2界面相互作用的影响,提出来光催化反应过程的机理。
TiO_2 has been one of the most popular photocatalysts because of its low cost, low toxicity, high physical and chemical stability, but its wide band gap(3.2 and 3.0 e V for anatase and rutile phase, respectively) results its inactivity in the visible light region, which limits its practical applications greatly. In this paper, Fe-dcbpy-phen complex was used to sensitize TiO_2 photocatalyst. The enhanced photocatalytic activities of TiO_2 on the degradation of phenol under visible light were achieved. The interfacial interaction between complexes and TiO_2 surface were discussed in detail, including not only the anchoring group number and conjugated structure of Fe-complexes but also the phase structure, crystal parameter and visible light absorbing capability of TiO_2.
引文
[1]Eunyoung Bae,Wonyong Choi,J.Phys.Chem.B 110(2006)14792–14799.
[2]Hyunwoong Park,Eunyoung Bae,Jae-Joon Lee,Jaiwook Park,and Wonyong Choi,J.Phys.Chem.B 2006,110,8740-8749.