The present study is focused on green technology for converting cigarette filters (CFs) into cigarette carbonaceous (CC) hydrochar as a useful product with added value and lower toxicity. This work was aimed at three primary environmental goals: first, the valorization of CFs by their conversion into a novel adsorbent as a cheap and economic source; second, this structure can offer highly stable and reactive support for growing ZIF-67 metal-organic framework (MOF); and third, the CC-hydrochar/ZIF-67 nanofluids can be employed for the CO2 capture process in a newly designed packed column. CC-hydrochar/ZIF-67 was characterized through FTIR, XRD, FESEM, and BET analyses. The CC-hydrochar/ZIF-67 nanofluid was prepared by a simple and surfactant-free method and characterized by zeta potential and DLS analyses. Its CO2 capture performance was then evaluated in aqueous media. The capture tests were conducted in a packed bed column, while the central composite design was used to understand the interactions among the operational parameters, including CC-hydrochar/ZIF-67 loading, liquid flow rate, gas flow rate, and CO2 initial concentration. The obtained results indicated the maximum CO2 capture percentage (98.02%) at the optimum conditions involving a CC-hydrochar/ZIF-67 loading of 0.06 g/L, a liquid flow rate of 0.40 L/min, a gas flow rate of 3.00 m(3)/h, and a CO2 initial concentration of 4500 ppm. Finally, the mass-transfer performance was evaluated in the applied absorbents by the calculation of the overall mass-transfer coefficient per unit volume (KGa), the height of transfer unit (HTU), the number of transfer unit (NTU), and the total height of packing in the column (Z). The results indicated that the CC-hydrochar-ZIF-67 nanofluid could be considered as an efficient and economical alternative for conventional absorbents.