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Extraction of Perchlorate Using Porous Organosilicate Materials
Center for Bio/Molecular Science and Engineering, Naval Research Laboratory, Washington, DC 20375, USA
NOVA Research Incorporated, Alexandria, VA 22308, USA
Chemistry Department, US Naval Academy, Annapolis, MD 21402, USA
* Author to whom correspondence should be addressed.
Received: 24 January 2013; in revised form: 21 March 2013 / Accepted: 22 March 2013 / Published: 2 April 2013
Abstract: Sorbent materials were developed utilizing two morphological structures, comprising either hexagonally packed pores (HX) or a disordered pore arrangement (CF). The sorbents were functionalized with combinations of two types of alkylammonium groups. When capture of perchlorate by the sorbents was compared, widely varying performance was noted as a result of differing morphology and/or functional group loading. A material providing improved selectivity for perchlorate over perrhenate was synthesized with a CF material using N-trimethoxysilylpropyl-N,N,N-trimethylammonium chloride. Materials were applied in batch and column formats. Binding isotherms followed the behavior expected for a system in which univalent ligands of varying affinity compete for immobilized sites. Performance of the sorbents was also compared to that of commercial Purolite materials.
Keywords: periodic mesoporous organosilica; perchlorate; solid phase extraction; groundwater monitoring
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Johnson, B.J.; Leska, I.A.; Melde, B.J.; Siefert, R.L.; Malanoski, A.P.; Moore, M.H.; Taft, J.R.; Deschamps, J.R. Extraction of Perchlorate Using Porous Organosilicate Materials. Materials 2013, 6, 1403-1419.
Johnson BJ, Leska IA, Melde BJ, Siefert RL, Malanoski AP, Moore MH, Taft JR, Deschamps JR. Extraction of Perchlorate Using Porous Organosilicate Materials. Materials. 2013; 6(4):1403-1419.
Johnson, Brandy J.; Leska, Iwona A.; Melde, Brian J.; Siefert, Ronald L.; Malanoski, Anthony P.; Moore, Martin H.; Taft, Jenna R.; Deschamps, Jeffrey R. 2013. "Extraction of Perchlorate Using Porous Organosilicate Materials." Materials 6, no. 4: 1403-1419.