title: Fundamental studies of methyl iodide adsorption in DABCO impregnated activated carbons.
abstract: Methyl iodide capture from a water vapor stream using 1,4-diazabicyclo[2.2.2]octane (DABCO)-impregnated activated carbons is, for the first time, fundamentally described here on the atomic level by means of both molecular dynamics and grand canonical Monte Carlo simulations. A molecular dynamics annealing strategy was adopted to mimic the DABCO experimental impregnation procedure in a selected slitlike carbon pore. Predictions, restricted to the micropore region, are made about the adsorption isotherms of methyl iodide, water, and nitrogen on both impregnated and bare activated carbon models. Experimental and simulated nitrogen adsorption isotherms are compared for the validation of the impregnation strategy. Selectivity analyses of the preferential adsorption toward methyl iodide over water are also reported. These simulated adsorption isotherms sum up to previous experimental studies to provide an enhanced picture for this adsorption system of widespread use at nuclear plant HVAC facilities for the capture of radioactive iodine compounds.
authors.affiliation: Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, United Kingdom. c.herdes@imperial.ac.uk
authors.forename: Carmelo
authors.initials: C
authors.lastname: Herdes
authors.forename: Claudia
authors.initials: C
authors.lastname: Prosenjak
authors.forename: Silvia
authors.initials: S
authors.lastname: Román
authors.forename: Erich A
authors.initials: EA
authors.lastname: Müller
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D006847:Hydrocarbons, Iodinated / Q000737:chemistry*; D056004:Molecular Dynamics Simulation; D009010:Monte Carlo Method; D010879:Piperazines / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D006847:Hydrocarbons, Iodinated; D010879:Piperazines; D002244:Carbon; C014055:methyl iodide; C007306:triethylenediamine