研究目的
Investigating the photocatalytic fixation of nitrogen on TiO2 (B) nanotubes with large specific surface area, ultrathin shell, and submicrometer-sized cavity for efficient ammonia synthesis under mild conditions.
研究成果
The study successfully designed and fabricated an efficient nitrogen photofixation catalyst based on TiO2 nanotubes, which exhibited a high and stable ammonia yield under simulated solar light irradiation. The enhanced activity is attributed to the efficient nitrogen activation by the abundant surface defects and the improved light utilization on nanotube with the multiple light-scattering effect. This study highlights a promising route to nitrogen photofixation under mild conditions through the multiple cooperation.
研究不足
The study focuses on the photocatalytic fixation of nitrogen under mild conditions using TiO2 (B) nanotubes. Potential areas for optimization include further enhancing the light utilization efficiency and carrier separation to improve the photocatalytic activity.
1：Experimental Design and Method Selection:
The study employed a hard-template route to fabricate TiO2 (B) nanotubes with MoO3 nanorods as the template. Polyvinylpyrrolidone (PVP) was used to enhance the interaction between MoO3 nanorods and TiO2 nanosheets. The hollow nanotubes were obtained by etching the template in NaOH aqueous solution.
2：Sample Selection and Data Sources:
MoO3 nanorods were prepared through hydrothermal treatment and served as the template for the growth of TiO2 nanoshell.
3：List of Experimental Equipment and Materials:
Chemicals included ammonium molybdate tetrahydrate, nitric acid, Polyvinylpyrrolidone (PVP), ethanol, glycol, methanol, ammonia chloride, hydrochloric acid, titanium trichloride, Sodium hydroxide, mercuric iodide, seignette salt, potassium hydroxide, p-dimethylaminobenzaldehyd, aminosulfonic acid, and hydrazine hydrochloride.
4：Experimental Procedures and Operational Workflow:
The photocatalytic fixation of nitrogen was carried out under 300 W Xe lamp irradiation. The generated NH3 was measured by Nessler's reagent method.
5：Data Analysis Methods:
The ammonia concentration was measured by the Nessler′s reagent. Characterization techniques included TEM, XRD, SEM, Raman spectra, UV-vis absorbance spectra, ESR, and time-resolved fluorescence decay spectra.
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