Selective capture of CO2 by poly(amido amine) dendrimer-loaded organoclays†
Abstract
Clay loaded poly(amido amine) dendrimers were explored for capture and storage of CO2. The loading of dendrimer was promotive in the order of laponite > hydrotalcite > sericite and depended on the surface area of the clays. The CO2 adsorption on organoclays of laponite and sericite with cationic dendrimer increased with the amount of loaded dendrimer. While CO2 on pristine laponite was completely released in the desorption process, CO2 on organo laponite remained in part after the desorption equilibrium. Since the removal of CO2 from organo laponite was almost comparable to that from pristine clay, it can be mentioned that CO2 adsorbed on the binding site of laponite is almost desorbed but CO2 on the binding site of dendrimer is conserved in organoclay. In contrast, in the case of the CO2 adsorption on the organoclay of hydrotalcite with an anionic dendrimer, the diminution of adsorption sites on hydrotalcite owing to the occupation by dendrimer was observed. It can be mentioned that the cation-exchanged organo laponite loaded amine-terminated dendrimer is a valuable solid adsorbent with a highly selective capture capacity for CO2.