The Design and Synthesis of g-C3 N4/Cu5 FeS4/Au Ternary Heterjunction Photocatalyst and Study on Properties
A series of g-C3N4/Cu5FeS4/Au ternary heterojunction were synthesized by simple meth-od.The effects of Au deposition and Cu5FeS4 coupling on the performance of g-C3N4 were systematical-ly studied,and the photocatalytic activity of triethanolamine as a sacrificial agent was evaluated by photol-ysis of water under visible light irradiation.The experimental results show that g-C3N4/0.75％Cu5FeS4/0.75％Au ternary composites exhibited highly enhanced visible light photocatalytic H2 evolution from water-splitting(119.52 μmol·h-1·g-1),which was about 11.45 and 4.37 times higher than those of g-C3N4(10.44μmol·h-1·g-1)and g-C3N4/Cu5FeS4(27.32 μmol h-1·g-1)under identical conditions.The enhanced photocatalytic activity can be attributed to the assembly with Cu5FeS4 as electron bridge forming typical Type Ⅱ alignment can improve the charge separation efficiency and the strong interfacial contact between the three component can provide more"charge migration way"for efficient charge transfer across the interface.
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