pH-Tunable Hydrogelators for Water Purification: Structural Optimisation and Evaluation
Impacto
Scholar |
Otros documentos de la autoría: Greenland, Barnaby W.; Wood, Daniel M.; Acton, Aaron L.; Rodríguez Llansola, Francisco; Murray, Claire A.; Cardin, Christine J.; Miravet, Juan; Escuder, Beatriu; Hamley, Ian W.; Hayes, Wayne
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http://dx.doi.org/10.1002/chem.201102137 |
Metadatos
Título
pH-Tunable Hydrogelators for Water Purification: Structural Optimisation and EvaluationAutoría
Fecha de publicación
2012-02Editor
WileyISSN
0947-6539Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://onlinelibrary.wiley.com/doi/10.1002/chem.201102137/fullPalabras clave / Materias
Resumen
A focused library of potential hydrogelators each containing two substituted aromatic residues separated by a urea or thiourea linkage have been synthesised and characterized. Six of these novel compounds are highly ... [+]
A focused library of potential hydrogelators each containing two substituted aromatic residues separated by a urea or thiourea linkage have been synthesised and characterized. Six of these novel compounds are highly efficient hydrogelators, forming gels in aqueous solution at low concentrations (0.03–0.60 wt %). Gels were formed through a pH switching methodology, by acidification of a basic solution (pH 14 to ≈4) either by addition of HCl or via the slow hydrolysis of glucono-δ-lactone. Frequently, gelation was accompanied by a dramatic switch in the absorption spectra of the gelators, resulting in a significant change in colour, typically from a vibrant orange to pale yellow. Each of the gels was capable of sequestering significant quantities of the aromatic cationic dye, methylene blue, from aqueous solution (up to 1.02 g of dye per gram of dry gelator). Cryo-transmission electron microscopy of two of the gels revealed an extensive network of high aspect ratio fibers. The structure of the fibers altered dramatically upon addition of 20 wt % of the dye, resulting in aggregation and significant shortening of the fibrils. This study demonstrates the feasibility for these novel gels finding application as inexpensive and effective water purification platforms. [-]
Publicado en
Chemistry - A European Journal, 2012, Vol. 18, num. 9Derechos de acceso
Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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