首页|Construction of S-scheme cyano-modified g-C3N4/TiO2 film with boosted charge transfer and highly hydrophilic surface for enhanced photocatalytic degradation of norfloxacin
Construction of S-scheme cyano-modified g-C3N4/TiO2 film with boosted charge transfer and highly hydrophilic surface for enhanced photocatalytic degradation of norfloxacin
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Developing highly efficient and recyclable photocatalysts has been regarded as an attractive strategy to solve antibiotic contaminants.Herein,we designed and fabricated Cy-C3N4/TiO2 S-scheme heterojunction film with boosted charge transfer and a highly hydrophilic surface.The as-prepared heterojunction ex-hibited outstanding removal efficiency on tetracyclines and fluoroquinolone antibiotics(more than 80％within 90 min).The removal rate of 300-Cy-C3N4/TiO2 on norfloxacin(NOR)was 2.12,and 1.59 times higher than that of pristine TiO2,C3N4/TiO2,respectively.The excellent photocatalytic performance of 300-Cy-C3N4/TiO2 was attributed to the highly hydrophilic surface and effective transfer and separation of carriers.Moreover,the NOR degradation pathways were proposed based on the results of density func-tional theory(DFT),and liquid chromatography-mass spectrometry.The toxicity assessment indicated the toxicity of intermediates can be remarkably alleviated.The DFT calculation and selective photo-deposition experiment demonstrated that an internal electric field was formed at the heterojunction interface,and the charge carriers migrated between Cy-C3N4 and TiO2 following an S-scheme transfer pathway.This research not only provides a promising method for tracking charge distribution on thin-film heterojunc-tion photocatalysts but also helps us to design high-efficiency,and recyclable heterojunctions to solve antibiotic contaminants.
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