Halloysite as mineral adsorbent of Co₂ - Kinetics and adsorption capacity

Physical adsorption of carbon dioxide on various mineral adsorbents is becoming extremely interesting in the field of energy and environment where CCS technology is an option for CO₂ emission reduction. In the article the halloysite from Dunino deposit was assessed in terms of its potential use as a CO₂ adsorbent. Results of tests indicate that modified halloysite (i.e. calcinated or modified by acid treatment) has a relatively low adsorption capacity which should be easily increased by other surface modification methods. Sorption kinetic is rather fast and over 85-89% of CO₂ adsorption is accounted by a rapid sorption step i.e. 7 to 16 seconds.