The Morphology Modification of Limestone By Different Forms of Carbon Additives for CO2 Sequestration

The limestone was used to sequestrate the CO₂ in cement industry had been widely reported. The efficiency was dramatically reduced after several cycles due to the “sintering” of limestone. Here we found that we can improve the CO₂ sequestration capability of limestone by adding different carbon additives to modify the limestone morphology. We have compared the influence of different forms of carbon and found that we can improve the efficiency over 18% and 8% by adding carbon black and bamboo carbon respectively. However, it will decrease by adding layered graphite type materials such as, graphite and graphene. The experimental results were discussed and characterized by SEM, particle distribution, XRD, optical microscope, and its corresponding mechanism was proposed in the paper.