Iranian Journal of Oil and Gas Science and Technology
Quarterly Publication

Enhanced CO₂ Capture Using a Dual-Functionalized GO–MEA–CTAB Nanocomposite in a Bubble Column Reactor: Performance and Mass-Transfer Analysis

Articles in Press

Document Type : Research Paper

Authors

Siamak Azimi Maleki
masoomeh mirzaei
Amirhosein Shahbazi Kotenaei
Ali Alavi Fazel
Alireza Azimi

Department of Chemical Engineering, Mahs.C., Islamic Azad University, Mahshahr, Iran.

10.22050/ijogst.2026.597384.1788
Abstract
Efficient CO₂ capture in bubble columns requires both chemical affinity and effective gas–liquid transfer. This study evaluates a graphene oxide (GO) nanocomposite modified with monoethanolamine (MEA) and cetyltrimethylammonium bromide (CTAB) (F-GO) in a bubble-column reactor. XRD, FTIR, Raman, SEM, EDS, and XPS observations are discussed as evidence consistent with structural and chemical modification, with individual spectral features interpreted cautiously. Spectroscopy was used to characterize representative materials, whereas absorbent loading was evaluated independently using CO₂ absorption performance. The reported Raman ratios indicate changes in disorder and graphitic response and are discussed in the characterization results. Performance metrics included CO₂ solubility (X_CO₂), the overall gas-phase mass-transfer coefficient (K_G), t₉₀, and the dimensionless Bubble number (B_u). At 5.0 wt.% solvent and 0.02 wt.% F-GO, the reported maximum X_CO₂ was 5.8 × 10⁻⁴ mol cm⁻³ atm⁻¹ at Q = 2.5 L/min; E_X was approximately 1.65 at Q = 4.5 L/min and approximately 1.60 at Q = 4.5 L/min, while E_K reached approximately 2.0 at Q = 4.5 L/min. MEA-related functionality and CTAB-supported dispersion/interfacial effects are interpretations consistent with the available characterization and performance observations, not independently proven molecular mechanisms. Further validation, regeneration, stability, and scale-up studies are needed.

Keywords

CO₂ capture
graphene oxide
bubble column
nanocomposite
mass transfer enhancement
Subjects
Iranian Journal of Oil and Gas Science and Technology

Articles in Press, Accepted Manuscript
Available Online from 13 October 2026

  • Receive Date 17 August 2026
  • Revise Date 02 October 2026
  • Accept Date 13 October 2026

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