摘要
报道了一种新型Ag/Ag3PO4/g-C3N4三元复合光催化剂的制备及其半导体界面处的快速载流子分离所引起的光催化活性的显著增强效应.通过X射线衍射,扫描电子显微镜,紫外-可见吸收光谱以及光致发光光谱等就其晶体结构、形貌、组分、光学吸收以及载流子的快速分离行为进行了表征与分析.以罗丹明B作为模型化合物分子,研究发现,所制备的Ag/Ag3PO4/g-C3N4三元复合光催化剂在可见光照射下表现出比Ag3PO4以及Ag3PO4/g-C3N4二元催化剂更为优异的光催化活性.研究认为,Ag3PO4表面尺寸约为40 nm的Ag纳米粒子在可见光下受激所产生的等离子表面共振效应以及Ag3PO4与g-C3N4界面处所形成的类似异质结结构对所制备的Ag/Ag3PO4/g-C3N4三元复合光催化剂光催化活性的显著增强起到重要作用.
The preparation of a series of ternary Ag/Ag3PO4/g-C3N4 hybrid photocatalysts,which display enhanced photocatalytic activity,was reported.The crystal structure,morphology,composition,optical absorption,and efficient separation of charge carriers were studied by X-ray diffraction,scanning electron microscopy,absorption and photoluminescence spectroscopy measurements.Using rhodamine B as a model contaminant,the as-prepared Ag/Ag3PO4/g-C3N4 hybrid photocatalyst exhibited superior degradation performance under visible light irradiation than Ag3PO4 or binary Ag3PO4/g-C3N4 hybrid photocatalyst systems.The surface plasmon resonance of the 40 nm-silver nanoparticles formed on the surface of Ag3PO4 and the heterojunction formed at the interface between Ag3PO4 and g-C3N4,are considered to be the major physical-chemical origin and to be responsible for the enhanced photocatalytic activity.
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
2014年第1期78-84,共7页
基金
supported by the National Natural Science Foundation of China(51172044)
the Project R15‐CW‐11(MIT11109,MIT11110)by KFUPM(King Fahd University of Petroleum and Minerals)~~
关键词
银纳米粒子
磷酸银
石墨型氮化碳
表面等离子共振
异质结
Silver nanoparticle
Silver orthophosphate （Ag3PO4）
Graphitic carbon nitride （g-C3N4）
Surface plasmon resonance
Heterojunction structure
