Solvent absorption is one of the main commercial methods for CO2 capture. However, the process of solvent regeneration is energy intensive and constitutes the main cost in the whole process. The paper investigates the feasibility of a new method ,which is ,to control the pH value of solvent in reducing the energy consumption in solvent regeneration. Some Selected weak organic acids are added into typical solvents which are MEA, DEA and MDEA. It is found that the energy requirement for the release of CO2 is significantly reduced, which however is sensitive to the type of acid added. Meanwhile, CO2 releases faster as more amount of acids added. PH controlling method is thus potentially applicable in solvent technology.