Multi-walled carbon nanotube wrapped rare earth tungstate nanosheet composites for selective and rapid detection of sulfadiazine
Journal
Chemical Engineering Journal
Journal Volume
492
Start Page
152179
ISSN
1385-8947
Date Issued
2024-07-15
Author(s)
Santhiyagu Sahayaraj Rex Shanlee
Sundaresan Ruspika
Shen-Ming Chen
Ramachandran Balaji
Narendhar Chandrasekar
DOI
10.1016/j.cej.2024.152179
Abstract
Multi-walled carbon nanotube wrapped rare earth tungstate nanosheet composites are developed for the ultrasensitive and selective electrochemical detection of sulfa drug, sulfadiazine (SAN) as they exhibit high levels of toxicity towards public health and ecosystem. Here, we synthesized Gadolinium tungstate decorated with multi-walled carbon nanotubes (Gd2WO6/MWCNT) though hydrothermal processing and characterized by XRD, SEM, EDX, TEM, and EIS measurement to investigate the phase purity, morphology, and interfacial property. Gd2WO6 is a double perovskite that has high oxygen surface exchange kinetics and the MWCNT possesses high catalytic capability and a larger surface area contributes to the efficient sensing ability. The Gd2WO6/MWCNT possessed a great electrical conductivity owing to the synergism between the Gd2WO6 and MWCNT. The synergistic effect increases the surface area, ionic and electrical conductivity which increases the current response of SAN. Under optimum conditions, the Gd2WO6/MWCNT/GCE displays a broad linear of 0.01 – 671 µM and a LOD level of 2 nM (S/N ratio: 3) with a sensitivity of 0.371 µA µM cm−1. The analytical applicability of the proposed electrode modifier leads to a promising sensor for SAN detection in human urine and water samples with appreciable results.
Subjects
Differential pulse voltammetry
Electrochemical sensor
Multi-walled CNT
Rare earth tungstate
Sulfonamides
SDGs
Publisher
Elsevier BV
Type
journal article