Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 16, Pages 8552-8558Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta00525f
Keywords
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Funding
- National Natural Science Foundation of China [21035002, 21375014, 21175021]
- Social Development Project of Jiangsu [BE2012731]
- Social Development Project of Suzhou [ZXY2012027]
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A novel nanocomposite of zinc porphyrin functionalized graphene quantum dots (GQDs/ZnPor) was prepared and used as a photocatalyst for the degradation of an organic pollutant under visible-light irradiation. In order to synthesise the nanocomposites, large graphene sheets were first cleaved into small pieces of graphene oxide by a mixture of concentrated H2SO4 and HNO3. Then, the GQDs/ZnPor was synthesized by a simple hydrothermal route with ZnPor and the as-synthesized graphene oxide as precursors. The resultant GQDs/ZnPor nanocomposites were characterized by transmission electron microscopy (TEM) and optical measurements. The photocatalytic activity of GQDs/ZnPor was evaluated by the degradation of methylene blue (MB) under visible-light irradiation. Enhancement of the photocatalytic activity of GQDs/ZnPor compared with pure zinc porphyrin was achieved. The photocatalytic degradation mechanism of GQDs/ZnPor was also illustrated by photoluminescence measurements and free radical and hole scavenging experiments. The proposed GQDs/ZnPor has potential application for decomposing organic pollutants in water.
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