期刊
CHEMICAL ENGINEERING JOURNAL
卷 266, 期 -, 页码 112-120出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2014.12.089
关键词
Hydrothermal carbonization; Carboxymethylcellulose; Electrical conductivity; Carbon nanodots; Photocatalysts
资金
- National Key Technology RD Program [2012BAD32B04]
- Research Fund for the Fundamental Research Funds of the Central Universities [2572014EB01, 2572014AB17]
- National Natural Science Foundation of China [31170545]
- Hei Long Jiang Postdoctoral Foundation
Conductive carbon spheres (CSs) and water-soluble fluorescent carbon nano-dots (CNDs) were synthesized by the one-pot hydrothermal carbonization of carboxymethylcellulose (CMC) using urea as the nitrogen source. The CSs have diameters of 2-8 mu m and abundant nitrogen-containing functional groups. They contain N in two forms: (1) chemical N including amidogen and imido groups (-NH2-/-NH-), and (2) structural N including pyridine (N-6), pyrrolic/pyridone (N-5) and quaternary (N-Q) nitrogen. Activation at high temperature contributes to the formation of pyridine (N-6) and quaternary nitrogen (N-Q) with a graphite-like structure and higher stability. They are all conductive and CS0.2-900 was found to exhibit the highest electrical conductivity of 166 S/m. CNDs are monodispersed spheres with an average diameter of 32 am and show abundant oxygen-containing groups on their surface. They have excitationand emission-independent pH-sensitive properties. The use of CNDs as photosensitizer in a CND5/TiO2 system for methylene blue and phenol degradation under visible light irradiation is attractive. The spectral response range of the system was thus expanded from UV region to include part of the visible light region. (C) 2014 Elsevier B.V. All rights reserved.
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