Citation: BAI Jin, CHEN Xin, XI Zhao-Yi, WANG Xiang, LI Qiang, HU Shao-Zheng. Influence of Solvothermal Post-Treatment on Photochemical Nitrogen Conversion to Ammonia with g-C₃N₄ Catalyst[J]. Acta Physico-Chimica Sinica, ;2017, 33(3): 611-619. doi: 10.3866/PKU.WHXB201611102 shu

Influence of Solvothermal Post-Treatment on Photochemical Nitrogen Conversion to Ammonia with g-C₃N₄ Catalyst

College of Chemistry, Chemical Engineering, and Environmental Engineering, Liaoning Shihua University, Fushun 113001, Liaoning Province, P. R. China

Received Date: 23 September 2016
Revised Date: 10 November 2016

Fund Project: The project was supported by the National Natural Science Foundation of China (41571464)

In this work, graphitic carbon nitride (g-C₃N₄) with large surface area and many nitrogen vacancies was synthesized by introducing ionic liquid[Bmim]Br as a solvent into the solvothermal post-treatment. X-ray diffraction (XRD), N₂ adsorption, scanning electron microscopy (SEM), UV-Vis spectroscopy, X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR), temperature-programmed desorption of N₂ (N₂-TPD), and photoluminescence (PL) spectroscopy were used to characterize the prepared catalysts. The morphology of the as-prepared g-C₃N₄ was markedly changed from an orderless layered structure to nanoparticles with a uniform size distribution of around 30-40 nm after the introduction of[Bmim]Br, leading an increase in surface area from 8.6 to 37.9 m²·g^-1. N₂-TPD, photoluminescence spectra, and density functional theory (DFT) simulations indicated that the nitrogen vacancies not only trapped the photogenerated electrons to enhance their separation rate, but also served as active sites for the adsorption and activation of N₂ molecules. The increased surface area of the as-prepared g-C₃N₄ meant that more nitrogen vacancies were exposed on the surface, leading to a markedly promoted nitrogen photofixation ability. The possible reaction mechanism is proposed.
- Graphitic carbon nitride,
- Ionic liquid,
- [Bmim]Br,
- Nitrogen photofixation
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Influence of Solvothermal Post-Treatment on Photochemical Nitrogen Conversion to Ammonia with g-C₃N₄ Catalyst