g-C3N4–P25有机-无机复合物制备及可见光诱导光催化转化CO2性能研究

g-C3N4 and P25 organic-inorganic composite for improved visible light-induced photocatalytic conversion of CO2

摘要:

通过简单混合和热处理方法合成了不同g-C3N4含量的g-C3N4–P25有机—无机复合物。通过XRD、HRTEM、紫外-可见漫反射光谱、红外光谱、XPS光谱和比表面测试对复合光催化剂进行表征。测试结果表明在可见光照射下，含60%或80% g-C3N4的g-C3N4–P25复合光催化剂的光催化还原CO2的活性高于单相的g-C3N4或P25. 合成的有机—无机复合物具有高的光催化活性是由于提高了半导体界面和内部电子–空穴对的分离.

Abstract:

g-C3N4 and P25 organic-inorganic composite with varying the content of g-C3N4 has been synthesized through facile mixing and heating method. The composite was characterized by X-ray diffraction, high-resolution transmission electron microscopy (HRTEM) and UV-vis diffuse reflection spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and BET surface area measurements. The activity of composite photocatalyst g-C3N4-P25 with 60% or 80% g-C3N4 for photoreduction of CO2 is higher than that of either single-phase g-C3N4 or P25 under visible light irradiation. The as-prepared organic-inorganic composite exhibits an improved photocatalytic activity due to enhancement of electron–hole separations both at the interface and in the semiconductors.