One-pot Synthesis of Phosphorus Doped G-C$lt;inf$gt;3$lt;/inf$gt;N$lt;inf$gt;4$lt;/inf$gt; with Enhanced Visible-light Photocatalytic Activity

A series of P-doped g-C 3 N 4 (P-CN) samples were prepared using urea (CO(NH 2 ) 2 ) and diammonium hydrogen phosphate ((NH 4 ) 2 HPO 4 ) as raw materials by a simple thermal condensation method.The surface morphologies and structures of the as-prepared samples were characterized by X-ray diffraction (XRD), fourier transform infrared spectroscope (FT-IR), X-ray photoelectron spectroscope(XPS), scanning electron microscope (SEM), transmission electron microscope (TEM), UV-Vis diffuse reflection spectra (UV-Vis DRS) and N 2 adsorption-desorption isotherms, respectively.The visible-light photocatalytic property was demonstrated for photodegradation of Rhodamine (RhB) solution, and the photocatalytic mechanism for the P-CN samples under visible-light was tentatively proposed.The corresponding results indicate that C atoms in g-C 3 N 4 are replaced by P atoms, which modifies the surface morphologies and electronic structures.The as-prepared P-CN samples show remarkably higher photocatalytic efficiency than pure g-C 3 N 4 for RhB degradation under visible-light irradiation.3%P-CN sample demonstrates the highest photocatalytic activity, which degrades 96.8% RhB after reaction for 30 min.The replacement of P to C atoms in g-C 3 N 4 makes the surface of P-CN in an electron-rich state.Furthermore, the research indicates the conduction band of P-CN shifts to