期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 21, 期 25, 页码 9126-9132出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201500163
关键词
dyes; hydrogen; nanosheets; quantum clusters; silver; UV; Vis spectroscopy
资金
- National Research Foundation of Korea (NRF) - Korea government (MEST) [2012R1A2A2A01047579]
- New & Renewable Energy of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) by Korea government Ministry of Knowledge Economy [20123010010160]
- National Research Foundation of Korea [2012R1A2A2A01047579] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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