Ionic liquids (ILs), 1-butyl-3-methyl-imidazolium tetrafluoroborate bmim][BF4]) and 1-(3-aminopro pyl)-3-methyl-imidazolium tetrafluoroborate ([apmim][BF4]), were mixed with an alkanolamine of 2-amino-2-methyl-1-propanol (AMP) to form two IL-based aqueous blends as CO2 absorbents, respectively. A membrane absorption coupling process was used to evaluate the performance of the IL-based aqueous blended absorbents for CO2 capture. Mixed process of the ILs with the AMP was investigated. Characteristics of the coupling process of the membrane contactor with the IL-based blended absorbents were studied by various modes of cyclic and non-cyclic absorption operations, static hot regeneration, and continuous circulation of absorption and regeneration, respectively. Results show that membrane flux and loading capacity of the IL-based blends could be enhanced by an addition of AMP into the ILs. Membrane flux and loading capacity of [apmim][BF4]+AMP reached 1.05 x 10(-3) mol m(-2) s(-1)and 0.65 mol mol(-1), respectively. A regeneration efficiency of almost 100% for the IL-based absorbents could be obtained by the static hot regeneration. The blended absorbents could give higher net and circular absorption capacities comparing with the corresponding single ILs in the coupling process of continuous circulation of absorption and regeneration. Net absorption capacities of [apmim][BF4]+AMP arrived at 0.48 mol mol(-1). AMP mixed into ILs significantly influenced the performance of the IL-based absorbents as well as the coupling process. (C) 2015 Elsevier B.V. All rights reserved.