采用溶胶-凝胶法合成了钴（Co）、氮（N）、碳（C）共掺杂的TiO₂纳米复合光催化剂。并通过SEM、TEM、XRD、FT-IR、UV-Vis和XPS等手段对样品的形貌、结构和带隙进行了表征。结果表明，Co、N、C共掺杂的TiO₂可以在TiO₂的带隙中形成杂质能级，缩短带隙能量（2.69 eV）。在Co、N、C共掺杂TiO₂（Co/N-TiO₂@C）和可见光照射30 min后，其对四环素（TC）的降解率为94.5%；照射60 min后，TC的降解率高达97.19%。在Co/N-TiO₂@C和可见光存在下循环3次后，TC的降解率降低到70.19%，这是由于掺杂离子浸出导致催化剂活性降低。

Cobalt (Co), nitrogen (N) and carbon (C) co-doped TiO₂ nanocomposite photocatalyst is synthesized via the sol-gel method.The morphology, surface area, chemical composition and band gap of the samples are characterized by SEM, TEM, XRD, FT-IR, UV-Vis and XPS.UV-Vis (DRS) spectra evidence that the doping of Co, N and C co-doped TiO₂ can form impurity energy levels in the band gap of TiO₂ to shorten the band gap energy (2.69 eV).The degradation rate of tetracycline reaches 94.5% after irradiation for 30 min by visible light in the presence of Co, N and C co-doped TiO₂(Co/N-TiO₂@C), and the degradation rate reaches 97.19% after irradiation for 60 min.The degradation rate of tetracycline drops to 70.19% after 3 cycles in the presence of Co/N-TiO₂@C and visible light, which may be due to the reduction of catalytic activity caused by doping ion leaching.

吕苏云(1996-),女,硕士研究生,研究方向为光催化降解水中污染物,3223903716@qq.com