g-C3N4/Cu5FeS4/Au三元光催化剂的设计、合成及催化性质的研究
The Design and Synthesis of g-C3 N4/Cu5 FeS4/Au Ternary Heterjunction Photocatalyst and Study on Properties
郑佳欣 1徐宝彤 1礼峥 2钱坤 1徐振和 1高雨2
作者信息
- 1. 沈阳化工大学理学院,辽宁沈阳 110142
- 2. 沈阳化工大学材料科学与工程学院,辽宁沈阳 110142
- 折叠
摘要
采用简单的方法成功合成了三元g-C3N4/Cu5FeS4/Au异质结光催化剂,系统研究了Au沉积和Cu5FeS4耦合对g-C3N4性能的影响,将三乙醇胺作为牺牲剂并通过在可见光照射下的光解水反应评估其光催化活性.实验结果表明:g-C3N4/0.75％Cu5FeS4/0.75％Au纳米复合材料具有最高的析氢活性(119.52 μmol·h-1·g-1),分别是纯 g-C3N4(10.44 μmol·h-1·g-1)的11.45倍和g-C3N4/Cu5FeS4(27.32 μmol·h-1·g-1)二元结构的4.37倍.光催化活性的提高可归因于以Cu5FeS4为电子桥的组件形成的典型Ⅱ型异质结可以提高电荷分离效率,并且三个组件间牢固界面的接触可以提供更多的电荷迁移途径,以实现跨界面的有效电荷转移.
Abstract
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.
关键词
光催化/电荷迁移/异质结Key words
photocatalysis/charge transfer/heterojunction引用本文复制引用
出版年
2024
NETL
NSTL
万方数据