Research and Application of Materials Science

Coal Based Carbon Dots for Fe3+ Detection and Photoelectric Catalysis

JIANGJianzhe, WANGZheng, MAShangwen, AGengxiong, FENGRuiqi, RENTiezhen


The carbon dots (CDs) could be applied in advanced field by using their sensitivity of the optical phenomenon. In this paper, the CDs in an average size of 3.75 nm was synthesized from coal by one-step solvothermal method, in which ethylenediamine was a reaction solvent and a nitrogen-containing precursor in the system. A blue-green fluorescence appeared under ultraviolet light. The strongest fluorescence emission was recorded at 480 nm under the excitation wavelength of 400 nm. The coal-based CDs could specifically recognize Fe3+ and the detection limit was 0.103 μM. The coal-based CDs/TiO2 composite displayed an improved photoelectric response in 4 times comparing that of the TiO2 under the ultraviolet light with intensity of 10 mW cm-2. The photocatalytic activity over the degradation of organic molecules was accelerated as well.


solvothermal; carbon dots; Fe3+ detection; photocurrent response; photodegradation

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