采用水热法合成SnO₂/Na_0.9Mg_0.45Ti_3.55O₈(SnO₂/NMTO)异质结,考察了SnO₂/Na_0.9Mg_0.45Ti_3.55O₈对罗丹明B(RhB)的光催化活性。结果表明,SnO₂/Na_0.9Mg_0.45Ti_3.55O₈的光催化活性优于NMTO和SnO₂,SnO₂的质量分数为10.0%时,具有最好的光催化活性;光照时产生的光生电子大部分迁移到界面处,有助于延长光生电子-空穴对的寿命,从而提高其光催化性能。瞬态光电流响应结果证实,光生电子-空穴对得到了有效分离。

SnO₂/Na_0.9Mg_0.45Ti_3.55O₈ (SnO₂/NMTO) heterojunction is synthesized through a hydrothermal technique,and its photocatalytic activity for Rhodamine B (RHB) is investigated.The results show that the photocatalytic activity of SnO₂/NMTO is better than NMTO as well as SnO₂ in terms of the degradation of RhB.SnO₂/NMTO has the best photocatalytic activity when it contains 10% of SnO₂.Most of the photogenerated electrons generated during illumination migrate to the interface,which is helpful in prolonging the lifetime of photogenerated electron-hole pairs,thus enhancing the photocatalytic performance of SnO₂/NMTO.The results from transient photocurrent responses confirm that photogenerated electron-hole pairs are effectively separated.