Mesoporous TiO/g-CN composites with O-Ti-N bridge for improved visible-light photodegradation of enrofloxacin.

g-CN makes good prospects in photocatalytic field due to its two-dimensional (2D) structure and visible-light activity. How to improve its photocatalytic activity by minimizing the unexpected recombination of photo-induced charge carries on g-CN motivates our research. Herein, mesoporous TiO/g-CN composites are fabricated with 2D TiO(B) nanosheets regulating thermal condensation process of g-CN nanosheets. FT-IR and XPS results suggest that the formation of O-Ti-N chemical bond increases the percentage of N-(C) in the conjugated system, accelerating the transportation of photo-induced electrons. The optical property and PL results illustrate that the formed interface heterojunction with chemical bond facilitates the separation and transfer of photo-induced charge carriers. Hence, the removal constant of TiO/g-CN composites is 46.3 times higher than that of g-CN. This study opens up a new insight into the development of composite materials in the field of organic pollutant treatment.