Facile fabrication of ascorbic acid reduced graphene oxide-modified electrodes toward electroanalytical determination of sulfamethoxazole in aqueous environments
| Autor: | Chiaying Chen, Yen-Chun Chen, Jing-Fang Huang, Yu-Ting Hong, Ting-Wei Lee |
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| Rok vydání: | 2018 |
| Předmět: |
Aqueous solution
Graphene General Chemical Engineering Inorganic chemistry Oxide 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry Ascorbic acid 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences Electrochemical gas sensor law.invention chemistry.chemical_compound chemistry law Environmental Chemistry Surface modification Differential pulse voltammetry 0210 nano-technology |
| Zdroj: | Chemical Engineering Journal. 352:188-197 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2018.06.110 |
| Popis: | In the present work, a novel reduced graphene oxide (rGO)-based electrochemical sensor has been developed for the detection of sulfamethoxazole (SMZ) using differential pulse voltammetry. Ascorbic acid (AA) under acid conditions has proven to be an efficient yet environmentally benign reductant to recover the outstanding electrochemical activity of graphene. Additionally, the ascorbic-acid-reduced graphene oxide exhibits a high total removal rate of epoxide and hydroxyl functional groups, with a rich presence of carbonyl and carboxyl functional groups, allowing an excellent solution processing ability for realizing further functionalization and applications, unlike reduced graphene oxide produced by conventional harmful reductants (e.g., hydrazine). Moreover, excellence in the determination of SMZ is likely due to selective reduction of oxygen functional groups on the graphene basal planes by ascorbic acid, which enhances π–π interactions with SMZ, which is present in anionic forms in natural aqueous systems. The AArGO-modified electrodes achieved a linear range of 0.5–50 μM with a limit of detection of 0.04 μM and satisfied recoveries in different water samples. Additionally, the cationic surfactant (e.g., cetyltrimethylammonium bromide, CTAB) showed a promoting effect toward SMZ determination. Collectively, the AArGO modified electrodes showed great improvement in the anodic oxidation reactivity of SMZ with high selectivity and stability, allowing promising and feasible applications in on-site environmental monitoring. |
| Databáze: | OpenAIRE |
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