Silver Quantum Cluster (Ag-9)-Grafted Graphitic Carbon Nitride Nanosheets for Photocatalytic Hydrogen Generation and Dye Degradation

Title
Silver Quantum Cluster (Ag-9)-Grafted Graphitic Carbon Nitride Nanosheets for Photocatalytic Hydrogen Generation and Dye Degradation
Author
이정호
Keywords
dyes; hydrogen; nanosheets; quantum clusters; silver; UV; Vis spectroscopy; VISIBLE-LIGHT IRRADIATION; METAL NANOPARTICLES; AG; SEMICONDUCTOR; WATER; NANOSTRUCTURE; EVOLUTION; G-C3N4; COMPOSITES; CONVERSION
Issue Date
2015-06-15
Publisher
WILEY-V C H VERLAG GMBH
Citation
CHEMISTRY-A EUROPEAN JOURNAL, v. 21, Page. 9126-9132
Abstract
We report the visible-light photocatalytic properties of a composite system consisting of silver quantum clusters [Ag-9(H(2)MSA)(7)] (H(2)MSA=mercaptosuccinic acid) embedded on graphitic carbon nitride nanosheets (AgQCs-GCN). The composites were prepared through a simple chemical route; their structural, chemical, morphological, and optical properties were characterized by using X-ray diffraction (XRD), energy dispersive X-ray spectroscopy, transmission electron microscopy, UV/Vis diffuse reflectance spectroscopy, and photoluminescence spectroscopy. Embedment of [Ag-9(H(2)MSA)(7)] on graphitic carbon nitride nanosheets (GCN) resulted in extended visible-light absorption through multiple single-electron transitions in Ag quantum clusters and an effective electronic structure for hydroxyl radical generation, which enabled increased activity in the photocatalytic degradation of methylene blue and methyl orange dye molecules compared with pristine GCN and silver nanoparticle-grafted GCN (AgNPs-GCN). Similarly, the amount of hydrogen generated by using AgQCs-GCN was 1.7times higher than pristine GCN. However, the rate of hydrogen generated using AgQCs-GCN was slightly less than that of AgNPs-GCN because of surface hydroxyl radical formation. The plausible photocatalytic processes are discussed in detail.
URI
http://onlinelibrary.wiley.com/doi/10.1002/chem.201500163/fullhttp://hdl.handle.net/20.500.11754/33912
ISSN
1521-3765; 0947-6539
DOI
10.1002/chem.201500163
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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