In our study, N-doped titanium dioxide (N-TiO2) nanomaterials were successfully prepared using titanium butoxide and guanidinium chloride by simple sol-gel method. The significance of annealing gas environment (air, argon, and nitrogen) on their physicochemical properties and photocatalytic degradation against rhodamine B (RhB) under direct sunlight irradiation was investigated. The XRD and Raman data revealed that the crystal structure of N-TiO2 nanoparticles was changed from monophase anatase with less crystallinity in argon, and nitrogen to dual-phase anatase/rutile with higher crystallinity in the air. Moreover, DRS and PL results revealed that the introduction of N in the TiO2 matrix not only led to a red shift towards visible light but also narrowed the band gap (2.35 eV) and suppressed charge carries recombination unlike unmodified material. The BET showed a typical IV isotherm of mesoporous N-TiO2 materials with high specific surface area in the rage of 80-103 m2 g-1. Furthermore, their RhB photodegradation performance was dictated by the annealing gas type; nobly, the N-TiO2 prepared in air demonstrated the highest degradation performance (99%) with the highest apparent rate constant (0.0158 min-1) which is twice faster than the undoped TiO2. Such improved performance is mainly attributed to its higher crystallinity, mixed phase, aqueous-dispersion character, and lower recombination rate.
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Annealing gas driven preparation of mesoporous bicrystalline N-doped TiO2 nanomaterials for sustainable sunlight degradation activity
Published:
05 May 2023
by MDPI
in The 4th International Online Conference on Nanomaterials
session Nanotechnology for Catalysis, Electrochemistry, Energy, and Environment
Abstract:
Keywords: Key words Doping, TiO2, Photocatalysis, Rhodamine B, Anatase and Rutile
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