g-C₃N₄/BiOCl光催化固氮性能研究

g-C₃N₄/BiOCl for Photo Catalytic Nitrogen Fixation

摘要: 本文采用水热法制备g-C₃N₄/BiOX复合催化剂，并考察了其固氮性能。通过UV-Vis、XRD和电化学工作站对催化剂进行表征。结果表明，当g-C₃N₄原料三聚氰胺水热时间为8 h，BiOCl的含量为50%时，g-C₃N₄-8/BiOCl (50%)光催化剂吸光范围集中在可见光区，带隙适中，阻抗较小，平带电位小，表面电荷迁移能力强，光生电子易在催化剂表面传导，光生电子与空穴易分离，还原能力强，易给出电子，填充到氮气分子的反键轨道中去，易活化氮气分子，TOF值达到了9.92 μg∙g⁻¹∙min⁻¹。

Abstract: In this paper, the g-C₃N₄/BiOX composite catalyst was prepared by hydrothermal method, and its nitrogen fixation performance was investigated. The catalyst was characterized by UV-Vis, XRD and electrochemical workstation. The results show that when the hydrothermal time of melamine, the raw material of g-C₃N₄, is 8 hours and the content of BiOCl is 50%, the absorption range of the g-C₃N₄-8/BiOCl (50%) photocatalyst is concentrated in the visible light region. It has a moderate band gap, small impedance, small flat band potential, strong surface charge migration ability. Photo-generated electrons are easily conducted on the surface of the catalyst, and photo-generated electrons and holes are easily separated. It has strong reduction ability and is easy to give electrons, which are filled into the antibonding orbit of nitrogen molecules and are easy to activate nitrogen molecules. The TOF value reaches 9.92 μg∙g⁻¹∙min⁻¹.