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Citation: Ruru MA, Yingjie SONG, Yahui LI, Ermin ZHOU, Deqiang LI, Xiaojuan HUANG, Jun LI. Synergistic nitrogen doping and carbon support in TiO2 for enhanced photocatalytic degradation of methylene blue and oxytetracycline[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(3): 641-656. doi: 10.11862/CJIC.20250221 shu

Synergistic nitrogen doping and carbon support in TiO2 for enhanced photocatalytic degradation of methylene blue and oxytetracycline

  • 1.

    College of Chemistry and Chemical Engineering, Xinjiang Agricultural University, Urumqi 830052, China

  • 2.

    Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China

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  • In this study, sawdust served as a carbon source and urea as a nitrogen source to synthesize carbon- supported, nitrogen-doped TiO2 composites via a one-pot solvothermal method. The composites were characterized using FTIR, powder X-ray diffraction, X-ray photoelectron spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy, thermogravimetry-derivative thermogravimetry, scanning electron microscopy-energy dispersive spectroscopy, and transmission electron microscopy. Results indicated that all synthesized composites exhibit the anatase phase, with those calcined at 800 ℃ demonstrating enhanced crystallinity. Nitrogen is incorporated into the TiO2 lattice, while carbon is predominantly located on the surface. Photodegradation experiments showed that 20 mg of composite N-TiO2/C-800 achieved degradation rates of 93.4% for methylene blue (20 mg·L-1, 50 mL) and 99.4% for oxytetracycline (20 mg·L-1, 50 mL) within 30 min. Free radical capture experiments indicated that h+ was the primary active species in the photocatalytic degradation process.
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