Table 4. CO₂ pH of the Solutions after Regeneration.

amine-based solutions	fresh solution	cycle 1	cycle 2	cycle 3
30% MEA	11.08	10.93	10.84	10.68
30% MEA-0.2 mg/mL GO	12.05	10.67	10.48	10.24
30% EDA	11.28	10.65	10.17	9.86
30% EDA-0.2 mg/mL GO	12.14	10.93	10.43	10.43