title: Studies of aluminum (III) ion-selective optical sensor based on a chromogenic calix[4]arene derivative.
abstract: An optical chemical sensor based on azo-calix[4]arene derivative is developed for the determination of aluminum (III) ions in aqueous solutions. The complex formation ability of azo-calix[4]arene toward metal cations such as Li(I), Cs(I), K(I), Sn(II), Pb(II), Cu(II), Eu(III), Er(III) and Al(III) is investigated by UV-vis spectroscopy. Assessments of results reveal that the azo-calix[4]arene derivative has high affinity to Al(III). The stoichiometric ratio and the association constant were determined as 1:1 and 1.24×10(4)M(-1), respectively for the complex between Al(3+) and the azo-calix[4]arene. The sensing film is fabricated by spin coating on glass plates. Under the optimized conditions, at pH 6.8, the proposed optical sensor displays a linear response to Al(3+) over 10(-7) to 10(-5)M range with response time of 12min. The optical sensor can be regenerated with HNO3 solution. In addition to its high stability and reproducibility, the sensor shows good selectivity for Al(3+) ion.
authors.affiliation: Laboratoire des Interfaces et Matériaux Avancés (LIMA), Faculté des sciences de Monastir, Avenue de l'environnement, 5000 Monastir, Tunisia. mosaab.echabaane@yahoo.fr
authors.forename: M
authors.initials: M
authors.lastname: Echabaane
authors.forename: A
authors.initials: A
authors.lastname: Rouis
authors.forename: I
authors.initials: I
authors.lastname: Bonnamour
authors.forename: H
authors.initials: H
authors.lastname: Ben Ouada
mesh_terms: D000042:Absorption; D000535:Aluminum / Q000737:chemistry*; D047250:Calixarenes / Q000737:chemistry*; D002863:Chromogenic Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007477:Ions; D055095:Optics and Photonics / Q000295:instrumentation*; D015203:Reproducibility of Results; D012996:Solutions; D013056:Spectrophotometry, Ultraviolet; D013997:Time Factors
chemical_list: D002863:Chromogenic Compounds; D007477:Ions; D012996:Solutions; D047250:Calixarenes; D000535:Aluminum
keywords: Aluminum ion; Azo-calix[4]arene; Optical sensor; Spectrophotometric method