Preparation of Iodide Selective Carbon Paste Electrode with Modified Carbon Nanotubes by Potentiometric Method and Effect of CuS-NPs on Its Response

In this research, multiwalled carbon nanotubes (MWCNTs) was oxidized and chemically modified through reaction with 3-(trimethoxysilyl)propan-1-amine (TMSPA) and their subsequent reaction with 2-hydroxy-3-methoxy benzaldehyde. Subsequently, this material was metalized by reaction with copper acetate that lead to formation and impergeation of 2-methoxy-6-((3-(trimethoxysilyl)propylimino)methyl)phenol MMSPIMP-MWCNT-Cu. This novel material was identified with different techniques such as SEM and FT-IR analysis. In this work, the reported material are exhibited high accurate and repeatable monitoring of iodide due to its high surface area with various reactive centre. It exhibited selectivity for iodide over the wide linear dynamic range between 1.8×10^-6 and 1.15×10^-1M, with a Nernstian slope of -59.12±0.7mV per decade of activity and detection limit of 1.8×10^-6M. Copper sulfide nanoparticles were prepared and their effect on the electrode response was investigated. The results were improved in the presence of nanoparticles with fast and stable response, good reproducibility, long-term stability, high selectivity over the presence of common organic and inorganic anions, high detection limit and dynamic range. The proposed sensor has been applied as potentiometric determination of some iodine species over a pH range of 2.5-10.