摘要：TiO 2 with different chemical structures are successfully synthesized via a one-step single-mode magnetic microwave (SMMW) assisted process, during where Ti selectively oxidizes in magnetic field under Ar-O 2 mixed atmosphere. The chemical state and band structure of the as-prepared TiO 2 are well-controlled by changing the volume fraction of O 2 (φO 2 ) during SMMW synthesis. Ti 3+ self-doped TiO 2 (TiO 2-x , 0 < x < 2) is synthesized under lower φO 2 , while TiO 2 with specific core/shell structure (TiO 2+y core/TiO 2-x -TiO 2+z shell) is observed under higher φO 2 . The as-synthesized TiO 2 with controlled structures show sufficient light absorption in visible region and quite narrow bandgap (2.05 eV∼), whose value can be also tuned by φO 2 during SMMW synthesis. In addition, the synthesized TiO 2 exhibits highly efficient photocatalytic performance towards the degradation of Rhodamine B under UV and visible light irradiation. The formation mechanism for different structural TiO 2 can be attributed to the specific rapid heating and cooling dynamics induced by SMMW irradiation.
