Neutral red interlinked gold nanoparticles/multiwalled carbon nanotubes modified electrochemical sensor for simultaneous speciation and detection of chromium (VI) and vanadium (V) in water samples
By Filik, Hayati; Avan, Asiye Asl?han
Published in Microchemical Journal
Microchemical Journal
2020
Abstract
An electrochemical separation procedure has been developed for the speciation of Cr(VI) and V(V) in water samples. The sensing technique was based on the direct linear sweep voltammetric reduction of Cr(VI) and V(V) on a multi-walled carbon nanotube-neutral red-gold nanoparticles (MWCNTs-NR-AuNPs) modified commercially available screen-printed carbon electrode (SPCE). In this study, MWCNTs attached on the surfaces of NR-AuNPs via the covalent bonding between the carboxylic acid of MWCNTs and the free amine group of neutral red. The peak to peak separation of V(V) and Cr(VI) was about 269 mV, Totalchromium and vanadium were determined after oxidationofCr (III) to Cr(VI) and V(IV) to V(V) by potassium permanganate oxidation. The linear range of Cr(VI) and V(V) was 0.4