Abstract: A novel cadmium nano-composite carbon paste electrode based on biomimetic ion imprinted polymer (IIP) is constructed. The IIP was prepared by using vinyl pyridine and quinaldic acid as functional monomer and complexing agent, respectively. The nano-composite paste were made of cadmium imprinted polymer (IIP) as a sensing element, multi-walled carbon nanotube (MWCNT), nanosilica (NS), graphite powder, and room temperature ionic liquid (RTIL). The best response of the nano-composite sensor were obtained from the electrode composition of 5% MWCNT, 1% NS, 20% IIP, 20% RTIL, and 54% graphite powder. The proposed sensor shows a Nernstian response (29.2 ± 0.3 mV decade-1) in the range of 1.0 x 10-7 - 1.0 x 10-2 M with detection limit of 1.0 x 10-7 M. The response of the sensor is independent of pH in the range of 3.5-8.0. The nano-composite based Cd(II) sensor displayed very good selectivity, fast response time, and long lifetime.
Template and target information: cadmium ion, Cd(II)
Author keywords: cadmium, Ion Imprinted Polymer (IIP), Ion selective electrode, Ionic Liquids (IL), Multi-walled carbon nanotube (MWCNT), Nanosilica (NS), Potentiometry, sensor