【摘要】 TiO₂用于光催化技术受到两方面的限制:一方面较宽的禁带宽度限制了其对较大波长光的吸收;另一方面,光生载流子易复合导致光量子效率较低。TiO₂的诸多改性方法也都是针对这两方面来进行的。通过构造异质结实现光生载流子的分离,可以有效提高光生载流子的利用率,从而提高催化剂的光催化性能。TiO₂不同晶面具有不同的表面能及静态介电常数,因此不同表面接触时可以形成异质结。通过控制不同晶面的形成可以构造表面异质结,提高TiO₂催化剂的光催化性能。更多还原

【Abstract】 The application of TiO₂ in photocatalytic technology is limited in two aspects: The wider band gap limits its absorption of larger wavelength light; The photogenerated carriers are easy to recombine, resulting in lower photoquantum efficiency. Many modification methods of TiO₂ are also carried out for these two aspects. The separation of photogenerated carriers can be realized by constructing a heterojunction, which can effectively improve the utilization rate of photogenerated carriers to increase the photocatalytic performance of the catalyst. Different crystal faces of TiO₂ have different surface energies and static dielectric constants, so heterojunctions can be formed when different surfaces are in contact. The surface heterojunction can be constructed by controlling the formation of different crystal faces to improve the photocatalytic performance of TiO₂ catalyst.更多还原