| 초록 |
As the coffee industry grows, the amount of coffee waste discarded each year increases Most coffee wastes are landfilled or incinerated, and soils are contaminated by caffeine in coffee waste Herein coffee waste derived carbon dots (C-CDs) that emit blue light were synthesized The synthesized C-CDs was characterized using XPS, XRD, FT-IR, and FE-TEM In addition, optical properties were investigated by UV-Vis and PL spectroscopy The synthesized C-CDs were round shape with size of ~3.7 nm and showed graphitic structure C-CDs show PL dependence on pH and long term stability but independence on NaCl concentration The C-CDs showed promising applications as Fe3+ sensors in aqueous solutions The C-CDs exhibited strong turn off fluorescence when trace Fe3+ 0 to 100 μM was added to the solution In addition, fluorescence was recovered when ascorbic acid(AA) was added to the C-CDs Fe3+ complex The fluorescence response showed a good linear relationship, and the limit of detection ( was 4.314 and limit of quantification ( was 13.074 )The C-CDs and C CDs Fe3+ show very good selectivity for sensing Fe3+ and AA, respectively. |
