2026-06-21T17:40:20Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/39362021-11-10T09:38:26Zcom_10259_4313com_10259_5086com_10259_2604com_10259_4365col_10259_4314col_10259_4366

Trigo López, Miriam Pablos, Jesús Luis Muñoz Santamaría, María Asunción Ibeas Cortes, Saturnino Serna Arenas, Felipe García García, Félix Clemente García Pérez, José Miguel 2016-02-22T11:05:10Z 2016-02-22T11:05:10Z 2015-04 1759-9954 http://hdl.handle.net/10259/3936 10.1039/c4py01545b We synthesized a solid sensory material for the extraction, detection and quantification of iron(III) in aqueous media. The material is a film-shaped colorless polymer membrane that exhibits gel behavior. The Fe(III) extraction and sensing characteristics are imparted by a new monomer derived from a natural product (i.e., Kojic acid), which exhibits chelating properties toward Fe(III). The sorption of Fe(III) on the membrane in water has been thoroughly characterized, including the sorption kinetics, sorption isotherms and profiles as a function of the pH. Fe(III) sorption followed pseudo first-order kinetics and required approximately 30 min to reach equilibrium. The maximum sorption capacity was approximately 0.04 mmol/g, and the sorption isotherms are well modeled by the Langmuir equation. The complexes that were found in the solid phase are in good agreement with those previously identified in the aqueous phase. Moreover, the sorption is highly specific (i.e., a recognition process) and results from the formation of a colored complex (iron(III)-Kojic acid derivative moieties). Therefore, the colorless sensory membrane turns red upon immersion in aqueous solutions containing Fe(III). The color output allows for both the qualitative visual determination of the Fe(III) concentration as well as also titration of Fe(III) using a) a UV/vis technique (limit of detection of 3.6 × 10−5 M; dynamic range of five decades, lower concentration = 1.65 × 10−6 M) and b) a computer vision-based analytical chemistry approach via color definition of the sensory membrane (RGB parameters) obtained from an image recorded with a handy device (e.g., a smartphone) (limit of detection of 2.0 × 10−5 M). Spanish Ministerio de Economía y Competitividad-Feder (MAT2011-22544 and MAT2014-54137-R) and by the Consejería de Educación – Junta de Castilla y León (BU232U13) application/pdf eng Royal Society of Chemistry Polymer Chemistry. 2015, V. 6, n. 16, p. 3110–3120 http://dx.doi.org/10.1039/c4py01545b info:eu-repo/grantAgreement/MINECO/MAT2011-22544 info:eu-repo/grantAgreement/MINECO/MAT2014-54137-R info:eu-repo/grantAgreement/JCyL/BU232U13 Attribution-NonCommercial 3.0 Unported http://creativecommons.org/licenses/by-nc/3.0/ Este documento está sujeto a una licencia de uso Creative Commons, por la cual está permitido hacer copia, distribuir y comunicar públicamente la obra siempre que se cite al autor original y no se haga de él uso comercial info:eu-repo/semantics/openAccess Química orgánica Chemistry, Organic Aromatic polyamides and acrylic polymers as solid sensory materials and smart coated fibres for high acidity colorimetric sensing info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion