title: Adsorption, desorption, and thermodynamic studies of CO2 with high-amine-loaded multiwalled carbon nanotubes.
abstract: Commercially available multiwalled carbon nanotubes (CNTs) were functionalized with a high mass load of 3-aminopropyltriethoxysilane (APTS) to study their behaviors in the cyclic CO(2) adsorption as well as the associated thermodynamic properties. The breakthrough curve showed a fast kinetics of CO(2) adsorption resulting in percentage ratios of working capacity to equilibrium capacity greater than 80%. The adsorption capacity of CNT(APTS) was significantly influenced by the presence of water vapor and reached a maximum of 2.45 mmol/g at a water vapor of 2.2%. The adsorption capacities and the physicochemical properties of CNT(APTS) were preserved through 100 adsorption-desorption cycles displaying the stability of CNT(APTS) during a prolonged cyclic operation. The heat input required to regenerate spent CNT(APTS) was determined, and the result suggests that adsorption process with solid CNT(APTS) is possibly a promising CO(2) capture technology.
authors.affiliation: Department of Environmental Engineering, National Chung Hsing University, Taichung 402, Taiwan.
authors.forename: Fengsheng
authors.initials: F
authors.lastname: Su
authors.forename: Chungsying
authors.initials: C
authors.lastname: Lu
authors.forename: Hung-Shih
authors.initials: HS
authors.lastname: Chen
mesh_terms: D000327:Adsorption; D002245:Carbon Dioxide / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D011437:Propylamines; D012821:Silanes / Q000737:chemistry*; D013499:Surface Properties; D013816:Thermodynamics
chemical_list: D037742:Nanotubes, Carbon; D011437:Propylamines; D012821:Silanes; D002245:Carbon Dioxide; C477625:amino-propyl-triethoxysilane