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Immobilization of Ionophore and Surface Characterization Studies of the Titanium(III) Ion in a PVC-Membrane Sensor
School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor D.E., Malaysia
ACECR Mashhad Branch, Food Science and Technology Research Institute, Mashhad 91775-1376, Iran
Department of Chemistry, Faculty of Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
Advanced Materials and Nanotechnology Laboratory, Institute of Advanced Technology Universiti Putra Malaysia, 43400 Serdang, Selangor D.E., Malaysia
* Authors to whom correspondence should be addressed.
Received: 11 May 2012; in revised form: 28 May 2012 / Accepted: 28 May 2012 / Published: 27 June 2012
Abstract: 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-methylcalixresorcinarene (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–IR), scanning electron microscopy (SEM) and and X-ray diffraction (XRD).
Keywords: ionophore-immobilized membrane; titanium(III) cation; c-methyl-calixresorcinarene; UV-Vis; Fourier transform infrared spectroscopy; scanning electron microscopy; X-ray diffraction
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Rezayi, M.; Heng, L.Y.; Kassim, A.; Ahmadzadeh, S.; Abdollahi, Y.; Jahangirian, H. Immobilization of Ionophore and Surface Characterization Studies of the Titanium(III) Ion in a PVC-Membrane Sensor. Sensors 2012, 12, 8806-8814.
Rezayi M, Heng LY, Kassim A, Ahmadzadeh S, Abdollahi Y, Jahangirian H. Immobilization of Ionophore and Surface Characterization Studies of the Titanium(III) Ion in a PVC-Membrane Sensor. Sensors. 2012; 12(7):8806-8814.
Rezayi, Majid; Heng, Lee Yook; Kassim, Anuar; Ahmadzadeh, Saeid; Abdollahi, Yadollah; Jahangirian, Hossein. 2012. "Immobilization of Ionophore and Surface Characterization Studies of the Titanium(III) Ion in a PVC-Membrane Sensor." Sensors 12, no. 7: 8806-8814.