title: Equilibrium and column adsorption studies of 2,4-dinitroanisole (DNAN) on surface modified granular activated carbons.
abstract: 2,4-Dinitroanisole (DNAN) is used as a component extensively in the development of insensitive munitions. This may result in release of DNAN into the environment. Here, the results are reported of a study on the removal characteristics of DNAN through adsorption on granular activated carbon (GAC), chitosan coated granular activated carbon (CGAC), acid treated granular activated carbon (AGAC) and alkali treated granular activated carbon (BGAC) under equilibrium and column flow conditions. The effect of pH, contact time, concentration of DNAN, and presence of electrolytes on the uptake of DNAN by the adsorbents was investigated. The equilibrium data were fitted to different types of adsorption isotherms. The data were further analysed on the basis of Lagergren first-order, pseudo second-order and intraparticle diffusion kinetic models. Breakthrough curves were obtained based on column flow results. All the adsorbents were capable of removing about 99% of DNAN from aqueous media, except CGAC which adsorbed about 87% of DNAN.
authors.affiliation: Environmental Processes Branch, US Army Engineer Research and Development Center, Construction Engineering Research Laboratory, Champaign, Illinois, USA. veera.boddu@usace.army.mil
authors.forename: V M
authors.initials: VM
authors.lastname: Boddu
authors.forename: K
authors.initials: K
authors.lastname: Abburi
authors.forename: A J
authors.initials: AJ
authors.lastname: Fredricksen
authors.forename: S W
authors.initials: SW
authors.lastname: Maloney
authors.forename: R
authors.initials: R
authors.lastname: Damavarapu
mesh_terms: D000327:Adsorption; D000840:Anisoles / Q000302:isolation & purification*; D002606:Charcoal / Q000737:chemistry*; D005591:Chemical Fractionation / Q000379:methods*; D048271:Chitosan / Q000737:chemistry; D004573:Electrolytes / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D014867:Water / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D000840:Anisoles; D004573:Electrolytes; D014874:Water Pollutants, Chemical; D014867:Water; D002606:Charcoal; C539360:2,4-dinitroanisole; D048271:Chitosan