Elizabeth Martínez

In this work, the MOF HKUST-1 and a combination of HKUST-1 with graphene oxide (GO) were synthesized via a green ball milling (BM) method, and their carbon capture performance was evaluated under post-combustion scenarios. A significant increase was observed in both CO₂ capacity (5.37 mmol CO₂/g for the composite compared to 3.15 mmol CO₂/g for the pristine MOF) and water sorption capacity (49 wt% for the composite compared to 29 wt% for pristine HKUST-1). Multicomponent dynamic sorption experiments, including gravimetric cycling and breakthrough measurements, show improved performance stability of the composite under humid conditions, with sustained CO2 uptake over repeated cycles. These results indicate modified competitive adsorption behaviour in the presence of water.,A multi-technique experimental insight into the competitive adsorption behaviour of the system is then provided through in situ methods. Infrared and ¹³C NMR spectroscopy, together with adsorption measurements, offer complementary qualitative evidence of guest–host and guest–guest interactions under different environments.,Overall, this study demonstrates that a small level of GO incorporation via mechanochemical synthesis can modify the CO₂/H₂O competitive adsorption behaviour of HKUST-1 under relevant humid conditions, highlighting its potential for post-combustion CO₂ capture applications.