A CO2-controllable phase change absorbent solvent used to waste recycling of dining lampblack

[Display omitted] •The CO2 controllable regenerative solvent was used to treat dining lampblack.•The realization the concept of waste treatment by waste.•The desorption process does not require additional energy and reagent introduction. Dining lampblack as a source of atmospheric pollution, urban residents had to spend a lot of economic costs all year round to solve its impact. However, traditional treatment methods often carry the risk of secondary pollution. The use of phase change absorption solvent (PCAS) controlled by CO2 can effectively absorb the oily components in dining lampblack, and smoothly avoid the generation of secondary pollutants and squandering of resources. The reversibility of PCASs under CO2 control was explained by pH changes and macroscopic visualizations. The absorption effects of favorable absorbents and PCASs on dining lampblack were compared and analyzed. The fatty acid (FA) in the oil absorption mixture was desorbed by interacting with D230. The results of GC/MS analysis on the oil components separated by desorption showed that the desorption of PCASs was effective for these refractory oil components. FAs can be enriched and applied to the subsequent dining lampblack treatment link to realize the waste recycling. In addition, the absorption and desorption of oily components by PCASs were combined with the CO2-controlled phase transformation of PCASs itself to achieve the absorption circulation of treating dining lampblack by using PCASs.