Preparation and Characterization of g-C₃N₄/Bi₂S₃ Composites by an Ionothermal Method

Bismuth sulphide (Bi₂S₃)/g-C₃N₄ composites were synthesized by an ionothermal method under defferent reaction temperature using Bi(NO₃)₃ as the bismuth source, thiourea as a sulphur source, and g-C₃N₄ as carrier in an ionic liquids reaction medium. The prepared samples were characterized by XRD, SEM, UV-vis spectrum and PL spectrum respectively. XRD results indicated that the prepared samples were only Bi₂S₃ phase and g-C₃N₄ phase in the Bi₂S₃/g-C₃N₄ composites. SEM results indicated that the Bi₂S₃ grains are nanorods. The UV-vis spectrum result indicated that the prepared samples exhibited stronger absorption over the entire visible light range. Especially when the reaction temperature was beyond 160℃, absorbance values of the prepared samples were beyond 0.5 over the entire visible light range. The PL spectrum result indicated that the fluorescence intensity of the prepared composites was obviously weakened with reaction temperature increasing. At the same time, the thermal conductivity of the prepared samples was tested. The result indicated that the thermal conductivity of the Bi₂S₃/g-C₃N₄ composites was increased with reaction temperature increasing.