Abstract: In order to explore the influence of nanoparticles on the absorption of CO_2 by TETA solution and the promotion effect of dispersants on the absorption of CO_2 by nanofluids,two-step method was used to prepare nanofluids with different oscillation time,different TETA concentration,different particle size,different solid content and type of nanoparticles and dispersant.The TETA solution bubbling experiment platform was built to absorb CO_2. The absorption of CO_2 by nanofluids prepared under different working conditions was tested and compared with the blank solution.The experimental results show that,the enhancement coefficient of the removal rate of the nanofluids appears to increase first and then decrease with the increase of the mass fraction of the nanoparticles. The larger nanoparticles have better mass transfer performance,and the larger size can reduce the relative surface area and energy,the surface and quantum scale effects of nanoparticles are weakened.The CO_2 absorption rate increases with the increase of ultrasonic crushing time in the initial stage.However,the absorption rate slows down when the ultrasonic crushing time exceeds 1.0 h.During the experiment of TETA concentration and solid content of nanoparticles,the enhancement coefficient of removal rate increases first and then decreases with the increase of concentration and solid content.To sum up,1.0 mol/L TETA added with 60 nm TiO_2 with 0.1 wt.% has the most obvious promotion effect on CO_2 after 1.0 h ultrasonic shock.The removal rate enhancement coefficient can be up to 1.9. When dispersants of C-Na,SDBS and X-100 are added into TiO_2-TETA-H_2O nanofluids,the surface of TiO_2 particles is positively charged,so the influence of dispersants on the stability of TiO_2-TETA-H_2O nanofluids is generally as follows: anionic > non-ionic > cationic.When the mass fraction of anionic dispersant C-Na is 0.1%,the stability of cationic nanofluid TiO_2-TETA-H_2O is the best based on the theory of double electron layer.