Macroporous silica for concentration of nitroenergetic targets
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- 作者：Br ; y J. Johnson ; Brian J. Melde ; Paul T. Charles ; Michael A. Dinderman ; Anthony P. Malanoski ; Iwona A. Leska ; Syed B. Qadri
- 关键词：Macroporous monolith ; Periodic mesoporous organosilica ; Hierarchical material ; Solid phase extraction ; TNT ; RDX
- 刊名：Talanta
- 出版年：2010
- 出版时间：15 June 2010
- 年：2010
- 卷：81
- 期：4-5
- 页码：1454-1460
- 全文大小：757 K
文摘
Hierarchical organosilicate sorbents were synthesized which possess structure on two length scales: macropores of approximately 1 μm lined by mesopores (35–45 Å). 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.