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A Novel Sensor for Monitoring of Iron(III) Ions Based on Porphyrins
Faculty of Chemistry-Biology-Geography, West University of Timisoara, Pestalozzi Street 16, 300115-Timisoara, Romania
Institute of Chemistry Timisoara of Romanian Academy, M. Viteazul Ave. 24, 300223-Timisoara, Romania
National Institute of Research for Electrochemistry and Condensed Matter, Timisoara, Aurel Paunescu Podeanu Street 144, 300860-Timisoara, Romania
Instituto Tecnológico de la Energía (ITE), Avenida Juan de la Cierva 24, 46980 Paterna, Valencia, Spain
* Author to whom correspondence should be addressed.
Received: 9 April 2012; in revised form: 27 May 2012 / Accepted: 8 June 2012 / Published: 13 June 2012
Abstract: Three A3B porphyrins with mixed carboxy-, phenoxy-, pyridyl- and dimethoxy-substituent functionalization on the meso-phenyl groups were obtained by multicomponent synthesis, fully characterized and used as ionophores for preparing PVC-based membrane sensors selective to iron(III). The membranes have an ionophore:PVC:plasticizer composition ratio of 1:33:66. Sodium tetraphenylborate was used as additive (20 mol% relative to ionophore). The performance characteristics (linear concentration range, slope and selectivity) of the sensors were investigated. The best results were obtained for the membrane based on 5-(4-carboxyphenyl)-10,15,20-tris(4-phenoxyphenyl)-porphyrin plasticized with bis(2-ethylhexyl)sebacate, in a linear range from 1 × 10−7–1 × 10−1 M with a slope of 21.6 mV/decade. The electrode showed high selectivity with respect to alkaline and heavy metal ions and a response time of 20 s. The influence of pH on the sensor response was studied. The sensor was used for a period of six weeks and the utility has been tested for the quantitative determination of Fe(III) in recovered solutions from spent lithium ion batteries and for the quantitative determination of Fe(III) in tap water samples.
Keywords: porphyrins; ion-selective electrode; potentiometry; lithium ion batteries; iron(III); PVC membrane
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Vlascici, D.; Fagadar-Cosma, E.; Popa, I.; Chiriac, V.; Gil-Agusti, M. A Novel Sensor for Monitoring of Iron(III) Ions Based on Porphyrins. Sensors 2012, 12, 8193-8203.
Vlascici D, Fagadar-Cosma E, Popa I, Chiriac V, Gil-Agusti M. A Novel Sensor for Monitoring of Iron(III) Ions Based on Porphyrins. Sensors. 2012; 12(6):8193-8203.
Vlascici, Dana; Fagadar-Cosma, Eugenia; Popa, Iuliana; Chiriac, Vlad; Gil-Agusti, Mayte. 2012. "A Novel Sensor for Monitoring of Iron(III) Ions Based on Porphyrins." Sensors 12, no. 6: 8193-8203.