Evaluation of novel aqueous piperazine-based physical-chemical solutions as biphasic solvents for CO2 capture: Initial absorption rate, equilibrium solubility, phase separation and desorption rate

•Novel aqueous PZ + sulfolane/1-propanol liquid–liquid biphasic solvents for energy-efficient CO2 capture were developed.•The concentration of PZ and AEP was adjusted to optimize absorption/desorption rate of the biphasic solvent.•Sulfolane and 1-propanol can improve liquid–liquid phase separation behavior and promote absorption and desorption performance.