title: Macroporous silica for concentration of nitroenergetic targets.
abstract: Hierarchical organosilicate sorbents were synthesized which possess structure on two length scales: macropores of approximately 1microm lined by mesopores (35-45A). The incorporation of macropores provides enhanced flow-through characteristics over purely mesoporous materials, thereby reducing back pressure when used in column formats. Materials of this type with varied surface groups were applied to the adsorption of 2,4,6-trinitrotoluene (TNT) and 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX) in both batch and column formats. The results presented here demonstrate the potential of these materials for application as solid phase extraction materials for the pre-concentration of nitroenergetic targets from aqueous solutions. The structural and binding characteristics of the materials have been evaluated and preliminary data on the impact of complex matrices is provided.
authors.affiliation: Center for Bio/Molecular Science & Engineering, Naval Research Laboratory, Washington, DC 20375-5348, USA. brandy.white@nrl.navy.mil
authors.forename: Brandy J
authors.initials: BJ
authors.lastname: Johnson
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Melde
authors.forename: Paul T
authors.initials: PT
authors.lastname: Charles
authors.forename: Michael A
authors.initials: MA
authors.lastname: Dinderman
authors.forename: Anthony P
authors.initials: AP
authors.lastname: Malanoski
authors.forename: Iwona A
authors.initials: IA
authors.lastname: Leska
authors.forename: Syed B
authors.initials: SB
authors.lastname: Qadri
mesh_terms: D000327:Adsorption; D002623:Chemistry Techniques, Analytical; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods*; D053834:Explosive Agents / Q000737:chemistry; D008855:Microscopy, Electron, Scanning / Q000379:methods; D046529:Microscopy, Electron, Transmission / Q000379:methods; D012822:Silicon Dioxide / Q000737:chemistry*; D012996:Solutions; D014227:Triazines / Q000032:analysis; D014303:Trinitrotoluene / Q000032:analysis* / Q000302:isolation & purification*; D014835:Volatilization
chemical_list: D053834:Explosive Agents; D012996:Solutions; D014227:Triazines; D014303:Trinitrotoluene; D012822:Silicon Dioxide; C009160:cyclonite