各种水流中都含有多种活性药物成分。这些合成的不可生物降解的有机物由于毒性给传统的废水处理带来了麻烦。迫切需要开发替代技术，如可见光驱动的光催化，用可重复使用的光催化剂将这些物质完全氧化成二氧化碳和水。采用溶胶-凝胶法合成了Fe掺杂TiO₂和Ag-Fe共掺杂TiO₂纳米颗粒，其铁质量分数为0.5 wt%， Ti/Ag摩尔比为30 (Ag-Fe CT 30)。利用各种分析技术对纳米颗粒的形貌和结构进行了研究。Ag-Fe CT 30光催化剂在太阳和紫外线照射下，与商业TiO₂、未掺杂TiO₂和Fe掺杂TiO₂纳米光催化剂相比，表现出优异的光催化活性，用于去除水中的抗真菌药物中间体二氟三唑苯乙酮(DFTA)。Ag-Fe CT 30在太阳和紫外线照射下的COD还原效率最高，证明了Ag-Fe CT 30光催化剂吸收紫外线和可见光的潜力。Ag-Fe CT 30在4次运行中表现出良好的稳定性，疗效没有明显下降。该研究为可重复使用的Ag-Fe CT 30光催化剂在高强度COD废水处理中的太阳能应用提供了见解。测定了光催化还原COD的动力学。
 

Highlights

• TiO₂, Fe doped TiO₂ and Ag-Fe codoped TiO₂ nanoparticles have been successfully synthesized using the sol-gel method and characterized using various analytical methods.
• Photocatalytic activity of different photocatalysts for mineralization of DFTA is compared under solar and UV irradiation for COD removal (with initial COD of 75,000 mg/L) has been carried out.
• Kinetics for Ag-Fe codoped TiO₂ photocatalysis has been determined.
• The photocatalysts can be easily separated from the water after application and show good stability up to 4 runs indicated from six recycled tests.