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Peer-reviewedCC BY 4.0Nanomaterials

Experimental Investigation of CO2 Uptake and Absorption Kinetics in APTES-Modified Fe3O4/Water Nanofluids

  • Seokhyun Ko1
  • Muhammad Ali2
  • Jin Hyun Kim3
  • Honghyun Cho1
  • Jeonggyun Ham1
  1. 1Department of Mechanical Engineering, Chosun University, 10, Chosundae 1-gil, Dong-gu, Jeonnam-Gwangju 61452, Republic of Korea
  2. 2Department of Mechanical Engineering, Graduate School of Chosun University, 10, Chosundae 1-gil, Dong-gu, Jeonnam-Gwangju Special Metropolitan City 61452, Republic of Korea
  3. 3Cooperation Foundation, Sunchon National University, Suncheon-si, Jeonnam-Gwangju 57922, Republic of Korea
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Abstract

This study experimentally investigated CO2 absorption in APTES-modified Fe3O4/water nanofluids under continuous bubbling at nanoparticle concentrations of 0–0.1 wt% and temperatures of 10, 20, and 30 °C. Performance was evaluated using effective CO2 uptake and the apparent absorption rate constant, with enhancements calculated relative to deionized (DI) water at the same temperature. Effective uptake decreased with increasing temperature and exhibited a nonmonotonic concentration dependence, whereas normalized uptake profiles generally indicated a more rapid approach to the final uptake at higher temperatures. The highest uptake was 2.084 g L−1 at 10 °C and 0.01 wt%. The largest uptake enhancement was approximately 13.2% at 30 °C and 0.05 wt%, although the apparent rate constant decreased by approximately 4.1% under this condition. The greatest kinetic enhancement occurred at 10 °C and 0.1 wt%. Enhancement ranges across concentrations widened with increasing temperature for both metrics, while the largest ranges across temperatures occurred at different concentrations for uptake and kinetics. Normalized performance maps showed that conditions favoring uptake did not necessarily maximize the kinetic benefit of nanoparticle addition. These results support selecting nanoparticle concentration in relation to operating temperature and the relative importance of uptake and absorption rate.

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Cite

BibTeXRIS
BibTeX
@article{ko2026experimental,
  title = {{Experimental Investigation of CO2 Uptake and Absorption Kinetics in APTES-Modified Fe3O4/Water Nanofluids}},
  author = {Seokhyun Ko and Muhammad Ali and Jin Hyun Kim and Honghyun Cho and Jeonggyun Ham},
  journal = {Nanomaterials},
  year = {2026},
  month = nov,
  doi = {10.3390/nano16211404},
  url = {https://www.mdpi.com/2079-4991/16/21/1404},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Experimental Investigation of CO2 Uptake and Absorption Kinetics in APTES-Modified Fe3O4/Water Nanofluids
AU  - Seokhyun Ko
AU  - Muhammad Ali
AU  - Jin Hyun Kim
AU  - Honghyun Cho
AU  - Jeonggyun Ham
PY  - 2026
DA  - 2026/11/01
JO  - Nanomaterials
DO  - 10.3390/nano16211404
UR  - https://www.mdpi.com/2079-4991/16/21/1404
AB  - This study experimentally investigated CO2 absorption in APTES-modified Fe3O4/water nanofluids under continuous bubbling at nanoparticle concentrations of 0–0.1 wt% and temperatures of 10, 20, and 30 °C. Performance was evaluated using effective CO2 uptake and the apparent absorption rate constant, with enhancements calculated relative to deionized (DI) water at the same temperature. Effective uptake decreased with increasing temperature and exhibited a nonmonotonic concentration dependence, whereas normalized uptake profiles generally indicated a more rapid approach to the final uptake at higher temperatures. The highest uptake was 2.084 g L−1 at 10 °C and 0.01 wt%. The largest uptake enhancement was approximately 13.2% at 30 °C and 0.05 wt%, although the apparent rate constant decreased by approximately 4.1% under this condition. The greatest kinetic enhancement occurred at 10 °C and 0.1 wt%. Enhancement ranges across concentrations widened with increasing temperature for both metrics, while the largest ranges across temperatures occurred at different concentrations for uptake and kinetics. Normalized performance maps showed that conditions favoring uptake did not necessarily maximize the kinetic benefit of nanoparticle addition. These results support selecting nanoparticle concentration in relation to operating temperature and the relative importance of uptake and absorption rate.
SN  - 2079-4991
ER  -