2020年7月4日，我院教师郭峰等“Fabrication of TiO2/high-crystalline g-C3N4 composite with enhanced visible-light photocatalytic performance for tetracycline degradation”研究成果在《Journal Chemical Technology Biotechnology》上发表。
BACKGROUND: The construction of heterojunction between two-phase semiconductors is a crucial tactic to enhance photocatalytic activity due to its efficient charge separation.
RESULT: In this work, a novel TiO2/high-crystalline g-C3N4 (HCCN) heterojunction photocatalyst was synthesized successfully via a simply hydrothermal method, which was composed of TiO2 nanoparticles distributed on the surface of the HCCN nanosheets. The microstructure and morphology of TiO2/HCCN heterojunction were investigated by various characteristic techniques (such as X-ray diffraction, transmission electron microscopy and Fourier transform infrared). The photocatalytic performance of as-prepared photocatalysts was tested though the degradation of tetracycline (10 mg L?1) under visible light irradiation (λ> 420 nm). Significantly, the 50% TiO2/HCCN composite photocatalyst (mass fraction of TiO2 is 50%) exhibited the optimum photocatalytic activity (90%, 120 min), and the corresponding reaction rate constant was around 12 times and 54 times higher than those of pristine HCCN and TiO2, respectively.
CONCLUSION: The excellent photocatalytic performance was attributed mainly to the synergistic effect of the TiO2/HCCN heterojunction as follows: (i) enhanced light absorption capacity; (ii) improved separation and migration of electron–hole pairs; (iii) extended lifetime of photogenerated carriers. This current study extends our knowledge towards constructing other HCCN-based nanocomposites with extraordinary photocatalytic performance for addressing environmental problems.