With the development of information industries, abundant waste toner was produced along with the generation of waste toner cartridges in office works. Waste toner is considered a hazardous material due to the small size (2–7 μm) and components of polystyrene, polyacrylate, Fe3O4, and SiO2. Cancers of blood circulation and digestive systems will be induced if toner is inhaled. According to our knowledge, little information was published about the disposal technology of waste toner. This paper proposes an environmentally-friendly technology to dispose waste toner. Vacuum-gasification-condensation was employed to treat waste toner. Industrial chemicals, n-butene gas, and liquid oils of styrene, polystyrene, and acrylic ester were obtained from the pyrolysis of polystyrene and polyacrylate. The organics of waste toner began to be decomposed and gasified when the temperature reached 450 °C. Above 570 °C, most of the polystyrene and polyacrylate were converted to gases and then condensed into oil in the temperatures of 180 and 80 °C. SiO2 and Fe3O4 of waste toner were transformed into nano-Fe3O4 and nano-SiO2 and gathered. The size of the nanoparticles was about 200 nm. This paper provides a recovery technology of waste toner that is environmentally-friendly and high value-added.

No abstract

In the process of recycling spent lithium-ion batteries, citric acid is only used as a chelating agent to resynthesize new cathode materials by a sol-gel process or as a precipitant to separate Mn ions and Li ions.

No abstract

No abstract

No abstract

No abstract

No abstract