Waste frying oil as a precursor for one-step synthesis of sulfur-doped carbon dots with pH-sensitive photoluminescence

Proper disposal of waste frying oil (WFO) is an important waste-management concern. In this paper, we develop a facile method to reuse WFO for one-step synthesis of sulfur-doped carbon dots (S-C-dots) with the assistance of concentrated sulfuric acid. The as-synthesized S-C-dots are uniform in size...

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Bibliographic Details
Published in:Carbon (New York) 2014-10, Vol.77, p.775-782
Main Authors: Hu, Yaoping, Yang, Jing, Tian, Jiangwei, Jia, Li, Yu, Jun-Sheng
Format: Article
Language:English
Subjects:
Carbon
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Frying
Nanoparticles
Optical properties
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Photoluminescence
Physics
Synthesis
Ultraviolet emission
Wastes
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Summary:Proper disposal of waste frying oil (WFO) is an important waste-management concern. In this paper, we develop a facile method to reuse WFO for one-step synthesis of sulfur-doped carbon dots (S-C-dots) with the assistance of concentrated sulfuric acid. The as-synthesized S-C-dots are uniform in size and show partial disordered graphite-like structure. Different from the doping-free or nitrogen-doped carbon dots, the S-C-dots perform a strong ultraviolet emission at 378nm due to successful sulfur-doping. Noticeably, the S-C-dots exhibit a distinct pH-sensitive feature and the intensity of photoluminescence increases linearly in the pH range from 3 to 9. Furthermore, possessing fascinating optical properties, high photostability, and low cytotoxicity, the S-C-dots have served as fluorescent probes for cell imaging.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2014.05.081