title: Characterization of a sensitive and selective copper optode based on β-ketoimine modified calix[4]arene derivative.
abstract: In this paper, an optical sensor was proposed for sensitive determination of copper (II) ions in aqueous solution. The sensing membrane was prepared by coating β-ketoimine calix[4]arene derivative as ionophore on a glass plate surface. Thin β-ketoimine calix[4]arene layer was characterized by contact angle measurements showing a good surface coverage. Besides, a smooth and homogeneous morphology of the calixarene membrane was examined by atomic force microscopy (AFM). The response of the optode is based on the decrease in the absorbance signal at 309 nm upon exposure to buffer solutions containing Cu(2+) ions. At a pH 6.8, the proposed sensor displays a calibration response for copper over a wide concentration range of 1.0×10(-7) M to 1.0×10(-4) M with a detection limit of 2.0×10(-8) M and response time of 7-10 min. This optode exhibits good selectivity toward copper ions in comparison with common ions including Hg(2+) and Ag(+) ions. The copper sensing film can be regenerated using 0.01M HNO3 solution. In addition to its high stability, repeatability and reproducibility, the sensor shows operational life time of 4 weeks.
authors.affiliation: Laboratoire des Interfaces et Matériaux Avancés (LIMA), Faculté des sciences de Monastir, Avenue de l'Environnement, 5000 Monastir, Tunisia. Electronic address: rouisahlem2@yahoo.fr.
authors.forename: A
authors.initials: A
authors.lastname: Rouis
authors.affiliation: Laboratoire des Interfaces et Matériaux Avancés (LIMA), Faculté des sciences de Monastir, Avenue de l'Environnement, 5000 Monastir, Tunisia.
authors.forename: M
authors.initials: M
authors.lastname: Echabaane
authors.affiliation: Laboratoire des Interfaces et Matériaux Avancés (LIMA), Faculté des sciences de Monastir, Avenue de l'Environnement, 5000 Monastir, Tunisia.
authors.forename: N
authors.initials: N
authors.lastname: Sakly
authors.affiliation: Institut de Chimie & Biochimie Moléculaires & Supramoléculaires (ICBMS), UMR CNRS 5246, 43 Boulevard du 11 Novembre 1918, Université Claude Bernard Lyon 1, 69100 Villeurbanne, France.
authors.forename: I
authors.initials: I
authors.lastname: Bonnamour
authors.affiliation: Laboratoire des Interfaces et Matériaux Avancés (LIMA), Faculté des sciences de Monastir, Avenue de l'Environnement, 5000 Monastir, Tunisia.
authors.forename: H
authors.initials: H
authors.lastname: Ben Ouada
mesh_terms: D047250:Calixarenes / Q000737:chemistry*; D003300:Copper / Q000032:analysis*; D055664:Electrochemical Techniques / Q000295:instrumentation* / Q000379:methods; D006863:Hydrogen-Ion Concentration; D007097:Imines / Q000737:chemistry*; D007476:Ionophores / Q000737:chemistry*; D057230:Limit of Detection; D008567:Membranes, Artificial; D015203:Reproducibility of Results; D013499:Surface Properties
chemical_list: D007097:Imines; D007476:Ionophores; D008567:Membranes, Artificial; D047250:Calixarenes; D003300:Copper
keywords: Copper(II); Optode membrane; Spectrophotometry; β-Ketoimine calix[4]arene