Journal
INORGANIC CHEMISTRY COMMUNICATIONS
Volume 142, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.inoche.2022.109704
Keywords
S-scheme heterojunction; (001)-TiO2 nanosheets; Polymeric carbon nitride; Photocatalytic degradation
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In this study, a solvothermal method was used to grow two-dimensional titanium dioxide nano sheets on the surface of polymeric carbon nitride nano sheets to form a heterojunction, which showed excellent photodegradation performance for norfloxacin. The superior photocatalytic performance was attributed to the reduction of the bandgap, the formation of S-scheme heterojunctions, and the hierarchical nano sheet structure and built-in electric field at the interface.
Poor visible light response and low separation efficiency of photogenerated carriers restricted the availability of titanium dioxide for antibiotic photodegradation, and the fabrication of two-dimensional/two-dimensional (2D/ 2D) heterojunction by coupling to a narrower bandgap semiconductor was an effective approach. Herein, a simple solvothermal method was used to grow 2D (001)-facets-exposed titanium dioxide ((00 1)-TiO2) nano sheets in situ on the surface of 2D polymeric carbon nitride (PCN) nanosheets to obtain PCN/(0 0 1)-TiO2 heterojunction for the photodegradation of norfloxacin. The synthesized heterojunction composites exhibited superior photodegradation performance, and the norfloxacin degradation rate reached up to 99% under simulated solar for 90 min. The efficient photocatalytic performance was attributed to the reduction of the bandgap and the formation of S-scheme heterojunctions, which enhanced the absorption of visible light and the carrier migration separation efficiency. Futhermore, the hierarchical 2D/2D nanosheet structure and the built-in electric field formed also sped up the charge transfer at the interface. This work presented a new viable solution to the problem of antibiotic contamination.
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