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ACS Appl Mater Interfaces

Title:		Amine-functionalized porous silicas as adsorbents for aldehyde abatement
Author(s):		Nomura A; Jones CW;
Address:		"School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30332-0100, USA"
Journal Title:		ACS Appl Mater Interfaces
Year:		2013
Volume:		20130607
Issue:		12
Page Number:		5569 - 5577
DOI:		10.1021/am400810s
ISSN/ISBN:		1944-8252 (Electronic) 1944-8244 (Linking)
Abstract:		"A series of aminopropyl-functionalized silicas containing of primary, secondary, or tertiary amines is fabricated via silane-grafting on mesoporous SBA-15 silica and the utility of each material in the adsorption of volatile aldehydes from air is systematically assessed. A particular emphasis is placed on low-molecular-weight aldehydes such as formaldehyde and acetaldehyde, which are highly problematic volatile organic compound (VOC) pollutants. The adsorption tests demonstrate that the aminosilica materials with primary amines most effectively adsorbed formaldehyde with an adsorption capacity of 1.4 mmolHCHO g(-1), whereas the aminosilica containing secondary amines showed lower adsorption capacity (0.80 mmolHCHO g(-1)) and the aminosilica containing tertiary amines adsorbed a negligible amount of formaldehyde. The primary amine containing silica also successfully abated higher aldehyde VOC pollutants, including acetaldehyde, hexanal, and benzaldehyde, by effectively adsorbing them. The adsorption mechanism is investigated by (13)C CP MAS solid-state NMR and FT-Raman spectroscopy, and it is demonstrated that the aldehydes are chemically attached to the surface of aminosilica in the form of imines and hemiaminals. The high aldehyde adsorption capacities of the primary aminosilicas in this study demonstrate the utility of amine-functionalized silica materials for reduction of gaseous aldehydes"
Keywords:		"Adsorption Air/analysis Air Pollutants/analysis/chemistry/*isolation & purification Aldehydes/analysis/chemistry/*isolation & purification Amines/*chemistry Nuclear Magnetic Resonance, Biomolecular Silicon Dioxide/*chemistry Spectrum Analysis, Raman Volat;"
Notes:		"MedlineNomura, Akihiro Jones, Christopher W eng Research Support, Non-U.S. Gov't 2013/05/30 ACS Appl Mater Interfaces. 2013 Jun 26; 5(12):5569-77. doi: 10.1021/am400810s. Epub 2013 Jun 7"