Calcium oxide is a known adsorbent for the capture of carbon dioxide. In this study, CaO-based sorbents were prepared using the precipitation of solutions containing different anion precursors, including nitrate NO3- and chloride Cl-, by different alkaline precipitants. The sorbents prepared from the precipitation of salt solutions by alkaline solutions under specific precipitation conditions resulted in the excellent uptake capacity for CO2. These sorbents formed as a fine powder with a BET surface area (16.5 m(2)/g) and pore volume (0.35 cm(3)/g) showed almost 100% carbonation, at temperatures between 650 and 750 degrees C. Moreover, the carbonation proceeded predominantly during an initial short period. Under numerous carbonation/calcination cycles, these sorbents demonstrated a good reversibility. During a 17-cycle operation, the sorbents maintained a fairly high conversion of 70% at 700 degrees C. As the carbonation/calcination cycles progress, sorbent particles conglomerate to a loosely integrated lump resulting in a greater mass transfer resistance for CO2 molecules to reach the unreacted core of calcium oxide. It is observed that grinding of the formed chunk to fine particles could recover the activity of sorbent completely.