Modifications of Graphitic C_3N_4 with Multi-metal Oxides for Enhanced Visible-light Active Photocatalysis

摘要

Graphitic C_3N_4 (g-C_3N_4) was modified by doping with zinc and construction of heterostructures with silver and copper-vanadium oxides. XRD patterns revealed that graphitic structure of C_3N_4 was maintained after modifications. Besides new diffraction peaks appeared for the copper-vanadium oxide phase. However, upon modifications with zinc and silver no appreciable new peaks were observed in the XRD patterns. Vibrational spectroscopy investigations showed signature IR peaks for g-C_3N_4 and furher supported the findings in the XRD patterns. Red-shift upon modifications of g-C_3N_4 demonstrated better absorbance of visible-light. Thermogravimetry analysis showed weight loss for copper-vanadate phase transformation around 520 K, and decomposition temperature of g-C_3N_4 around 950 K that decreased with loading of metal/metal oxides. Photocatalysis effeciency of catalysts was evaluated by aqueous phase mineralization of Rhodamine B under visible-light irradation.