Coal Based Carbon Dots for Fe^(3+) Detection and Photoelectric Catalysis

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 Fe^(3+)and the detection limit was 0.103μM.The coal-based CDs/TiO_(2) composite displayed an improved photoelectric response in 4 times comparing that of the TiO_(2) under the ultraviolet light with intensity of 10 mW cm_(-2).The photocatalytic activity over the degradation of organic molecules was accelerated as well.

The Influence of Dry or Wet Activating Process to the Electrochemical Features of Biowaste Carbon

The utilization of biowaste to the activated carbon(AC)as electrode material is conducive to alleviating the energy crisis and promoting the high value-added.The popular KOH activation has been applied for years,but rare report clarified the difference of dry and wet activation,with which the batch producing technique could be different.Here nitrogen doped hierarchical AC was derived from wood chip by a wet or dry KOH activation.The surface area,framework structure and surface feature were characterized to reveal the effect of wet and dry activation.1.44 at%of nitrogen doped AC was made by dry KOH activation,which was higher than the AC derived from wet KOH activation with 1.36 at%of nitrogen.Their electrochemical properties were investigated in 6 mol L^(-1)of KOH,the capacitance of wAC was 401 F g^(-1)at 0.5 A g^(-1),but dAC possessed a capacitance of 215 F g^(-1).These indicated that AC obtained by using wet KOH activation displayed a potential application in energy field.