Amine-based carbon dioxide (CO

2

) capture is still limited by high desorption energy consumption. Fixing CO

2

into carbonate is a safer and more permanent method. In this work

calcium oxide (CaO) is introduced to perform chemical desorption instead of thermal desorption on 1

8-diazabicyclo [5.4.0

]

undec-7-ene (DBU) aqueous solution after CO

2

absorption. The X-ray diffraction (XRD) patterns of solid products show the formation of calcite calcium carbonate (CaCO

3

)

which prove the feasibility of this method. The effects of reaction temperature

reaction time and Ca

2+

/CO

3

2-

molar ratios on the related reactions in CO

2

absorption-mineralization process and CaCO

3

precipitation are discussed

and purer CaCO

3

is obtained by ultrasonic treatment. The CaCO

3

content can be increased to 95.8% and the CO

2

desorption ratio can achieve 80% by 30 min ultrasonic dispersion treatment under the conditions (40 ℃

180 min

Ca

2+

/CO

3

2-

molar ratio = 1.0). After five cycles

DBU aqueous solution shows stable CO

2

absorption and mineralization ability. Fourier transform infrared spectroscopy (FT-IR) spectra of the reaction process also indicate the regeneration of the solvent. Compared with thermal desorption

this process is exothermic

almost without no additional heat.