Water effect on CO2 absorption for hydroxylammonium based ionic liquids: A molecular dynamics study

► The effect of absorbed water is a moderate weakening of ion-ion interactions. ► Water molecules decrease CO2-ion interactions and lead to a rearrangement of CO2 spatial distribution around ions. ► Weak effect of water molecules that should lead to a viscosity decrease maintaining the CO2 absorption ability. ► Water content may be considered adequate, favouring CO2 transport within the studied hydroxylammonium fluids.