%0 Journal Article
%T Immobilization of Ionophore and Surface Characterization Studies of the Titanium(III) Ion in a PVC-Membrane Sensor
%A Majid Rezayi
%A Lee Yook Heng
%A Anuar Kassim
%A Saeid Ahmadzadeh
%A Yadollah Abdollahi
%A Hossein Jahangirian
%J Sensors
%D 2012
%I MDPI AG
%R 10.3390/s120708806
%X Novel ionophores comprising various hydroxide and amine structures were immobilized onto poly(vinyl chloride) (PVC) matrices, and these were examined to determine Ti(III) selectivity. To predict the selectivity of Ti(III), a PVC membrane was used to investigate the binding of Ti(III) to c-methylcalix[4]resorcinarene (CMCR). The study showed that the chelating ligand, CMCR, was coordinated selectively to Ti(III) at eight coordination sites involving the oxygen atoms at the interface of the membrane/solution. The membrane was prepared, based on CMCR as an ionophore, sodium tetrakis(4-fluorophenyl) borate (NaTFPB) as a lipophilic ionic additive, and dioctylphthalate (DOP) as a plasticizer. The immobilization of the ionophore and surface characterization studies revealed that the performance of CMCR-immobilized PVC was equivalent to that of mobile ionophores in supported liquid membranes (SLMs). The strengths of the ion-ionophore (CMCR-Ti(OH)(OH2)52+) interactions and the role of ionophores on membranes were studied via UV-Vis, Fourier transform infrared spectroscopy (FT¨CIR), scanning electron microscopy (SEM) and and X-ray diffraction (XRD).
%K ionophore-immobilized membrane
%K titanium(III) cation
%K c-methyl-calix[4]resorcinarene
%K UV-Vis
%K Fourier transform infrared spectroscopy
%K scanning electron microscopy
%K X-ray diffraction
%U http://www.mdpi.com/1424-8220/12/7/8806