Nano layered ion imprinted polymer based electrochemical sensor and sorbent for Mn (II) ions from real samples

Abstract

In this study, a multiwalled carbon nanotube based ion-imprinted polymer was prepared for the sensing and extraction of manganese ion. The binding sites for adsorption of Mn(II) ion were synthesized by free radical polymerization. For the comparison purpose ion imprinted polymer without using MWCNT was also prepared (MWCNT-NIP). To find out importance of MWCNT, ion imprinted polymer without MWCNT was also synthesized (IIP and NIP). The synthesized polymers were characterized by FT-IR, XRD, TEM, EDAX, and TGA. An electrochemical sensor was made by modifying a platinum electrode with MWCNT-IIP. The electrochemical response of the nanostructures modified platinum electrode were investigated and optimized. The limit of detection of the electrochemical sensor was investigated using DPV, it was found to be 0.0138 µM. The applicability of the modified electrochemical sensor was effectively applied for the sensing and extraction of Mn(II) ion from real samples collected from lake water, fertilizers, and mining effluents. The Mn(II) ion imprinted MWCNT-IIP exhibit Langmuir adsorption isotherm and pseudo-second-order kinetics which proposed homogenous monolayer formation of imprinting sites on the polymer sorbent. The selectivity studies were carried out using imprinted and non-imprinted polymers, the imprinted sorbent shows high selectivity and specificity towards Mn(II) ion than other metal ions.

Graphical Abstract

Keywords:

• Manganese (II)
• ion imprinting polymer
• MWCNT
• MWCNT-IIP
• cyclic voltammetry
• differential pulse voltammetry

Disclosure statement

No potential conflict of interest was reported by the authors.