Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/201063
Type: Artigo
Title: Free amino and imino-bridged centres attached to organic chains bonded to structurally ordered silica for dye removal from aqueous solution
Author: Rehman, Fozia
Volpe, Pedro L.O.
Airoldi, Claudio
Abstract: Ordered mesoporous SBA-15 type silica was synthesized by sol gel polymerization and reacted with 3-aminopropyltriethoxysilane (AP) or triethylenetetramine (TE), to attach pendant chains or bridging molecules, with basic centres. The materials were characterized by elemental analysis, infrared spectroscopy, and nuclear magnetic resonance in the solid state, X-ray diffractometry, scanning and transmission electron microscopy. The nitrogen sorption/desorption data for SBA-15 and the organofunctionalized SBA-15AP and SBA-15TE silicas resulted in IV type isotherms with hysteresis loops of the H1 type, surface areas of 800; 213 and 457 m(2) g(-1) and average pore diameters of 8.0; 3.2 and 6.8 nm, respectively. The ordered structural features of the mesoporous silica remained preserved after post-functionalization with pendant and bridged organic chains. Sorption data for organofunctionalized silicas gave highly selective sorption capacities for anionic water soluble Reactive Blue dye, with 0.064 and 0.072 mmol g(-1). Negligible sorption was observed with the unmodified mesoporous silica. The results suggest that organofunctionalized silica can be a simple, efficient, inexpensive and suitable method for the effective and selective removal of anionic organic dye pollutants from aqueous solutions.
Ordered mesoporous SBA-15 type silica was synthesized by sol gel polymerization and reacted with 3-aminopropyltriethoxysilane (AP) or triethylenetetramine (TE), to attach pendant chains or bridging molecules, with basic centres. The materials were charact
Subject: Silica mesoporosa
Agente sililante
Country: Reino Unido
Editor: Elsevier
Citation: Journal Of Environmental Management. v. 133, p. 135-43, 2014-Jan.
Rights: fechado
Fechado
Identifier DOI: 10.1016/j.jenvman.2013.11.042
Address: https://www.sciencedirect.com/science/article/pii/S0301479713007354
Date Issue: 2014
Appears in Collections:IQ - Artigos e Outros Documentos

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