| 초록 |
Printer toner waste is one of the major electrical and electronic waste materials causing serious environmental threats and health hazards. Globally, only about 20-30% of toner waste has been recycled, while much of remaining portion has been dumped in landfills, which aggravates air/soil pollution and respiratory diseases. However, recycling toner is still limited due to its chemical durability and complexity. Herein, we report that carbon nanodots (CNDs) can be derived from toner waste by a facile one-pot hydrothermal method with the aid of ethanolamine (EA) as a ‘cutting’ agent. EA could chemically break down the carbon black cores of toner into nanoparticles and simultaneously passivate the nanoparticle surface, which results in the formation of well-dispersed and uniform-sized CNDs. These CNDs strongly interact with deep-UV light to exhibit intense fluorescence at around 300 nm. Furthermore, various types of surface defects such as radicals and dangling bonds in the CNDs could effectively generate reactive oxygen species (ROS) under laser irradiation, which renders them suitable for photodynamic therapy applications. |
