Novel potentiometric sensor for the determination of Cd2+ based on a new nano-composite |
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| Authors: | Hasan Bagheri Abbas Afkhami Ali Shirzadmehr Hosein Khoshsafar Hamid Khoshsafar Hamed Ghaedi |
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| Institution: | 1. Department of Chemistry , Takestan Branch, Islamic Azad University , Takestan , Iran h.bagheri@tiau.ac.ir h.bagheri@srbiau.ac.ir;3. Faculty of Chemistry , Bu-Ali Sina University , Hamedan , Iran;4. Department of Chemistry , Takestan Branch, Islamic Azad University , Takestan , Iran;5. Faculty of Engineering , Bushehr Branch, Islamic Azad University , Bushehr , Iran |
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| Abstract: | A novel ion selective carbon paste electrode for Cd2+ ions based on 2,2′-thio-bis4-methyl(2-amino phenoxy) phenyl ether] (TBMAPPE) as an ionophore was prepared. The carbon paste was made based on a new nano-composite including multi-walled carbon nanotubes (MWCNTs), nanosilica and room-temperature ionic liquid, 1-Butyl-3-methylimidazolium hexafluorophosphate (BMIM-PF6). The constructed nano-composite electrode showed better sensitivity, selectivity, response time, response stability and lifetime in comparison with typical Cd2+ carbon paste sensor for the successful determination of Cd2+ ions in water and in waste water samples. The best performance for nano-composite sensor was obtained with an electrode composition of 18% TBMAPPE, 20% BMIM-PF6, 48% graphite powder, 10% MWCNT and 4% nanosilica. The new electrode exhibited a Nernstian response (29.95?±?0.10?mV?decade?1) toward Cd2+ ions in the range of 3.0?×?10?8 to 1.0?×?10?1?mol?L?1 with a detection limit of 7.5?×?10?9?mol?L?1. The potentiometric response of prepared sensor was independent of the pH of test solution in the pH range 3.0 to 5.5. It had a quick response with a response time of about 6?s. The proposed electrode showed fairly good selectivity over some alkali, alkaline earth, transition and heavy metal ions. |
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| Keywords: | carbon paste electrode cadmium multi-walled carbon nanotubes nanosilica ionic liquids potentiometric sensor |
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