Macroporous silica for concentration of nitroenergetic targets.
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.
Johnson
Brandy J
BJ
Center for Bio/Molecular Science & Engineering, Naval Research Laboratory, Washington, DC 20375-5348, USA. brandy.white@nrl.navy.mil
Melde
Brian J
BJ
Charles
Paul T
PT
Dinderman
Michael A
MA
Malanoski
Anthony P
AP
Leska
Iwona A
IA
Qadri
Syed B
SB
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
D053834:Explosive Agents; D012996:Solutions; D014227:Triazines; D014303:Trinitrotoluene; D012822:Silicon Dioxide; C009160:cyclonite