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Awal, Abdul
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Publications (4/4 displayed)
- 2024Electrochemical detection of sulfite using gold nanoparticles decorated poly[2-(methacryloyloxy) ethyl] trimethylammonium chloride: kinetic and mechanistic studiescitations
- 2023Electrooxidation of Toxic Sulfite Material Using Ni-Ru-Based Heterometallo Supramolecular Polymer as Electrocatalyst: Synthesis and Kinetics Studycitations
- 2023Fe(II)-Based Metallo-Supramolecular Polymer Film for Electrochemical Detection of Nitrite: Studies of Kinetics and Reaction Mechanismscitations
- 2022Fe(II)-Based Metallo-Supramolecular Polymer Film as a Sensing Material for the Detection of Nitritecitations
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article
Electrochemical detection of sulfite using gold nanoparticles decorated poly[2-(methacryloyloxy) ethyl] trimethylammonium chloride: kinetic and mechanistic studies
Abstract
<jats:title>Abstract</jats:title><jats:p>Given the widespread use of sulfites in various industries and their potential environmental and health impacts, accurate and efficient detection is crucial. The deployment of positively charged poly [2-(methacryloyloxy) ethyl] trimethylammonium chloride (PMTC) decorated with gold nanoparticles (AuNPs) offers a novel approach, enhancing sensitivity and specificity in the electrochemical detection of negatively charged sulfite ions (SO32-). A sensor for detecting SO32- was developed using PMTC decorated with AuNPs on a glassy carbon electrode (GCE). Transmission electron microscopy (TEM) was employed to examine the structural morphology of the composite material, and the formation of AuNPs was confirmed through ultraviolet-visible spectroscopy. Zeta potential analysis affirmed the positive charge of the PMTC composite, highlighting its effective coordination with the negatively charged SO32-. The surface conductivity of the modified GCE was studied using electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). Kinetic analyses, focusing on scan rate and pH dependencies, elucidated the SO32- oxidation dynamics and the interaction between the positively charged PMTC and negatively charged SO32-. Quantitative evaluation was performed using the current-time (I-t) technique, achieving a limit of detection of 0.41 ± 0.003 µM (S/N = 3) within a linear range of 6.66 µM to 1020 µM. The modified electrode demonstrated remarkable stability, repeatability, and resistance to common interferents. Real sample analysis using laboratory tap water with a fixed SO32- concentration exhibited excellent recovery. The oxidation of SO32- on the AuNPs-PMTC-GCE proceeded via first-order kinetics and followed a stepwise pathway facilitated by the charge interactions.</jats:p>