Preparation of Poly (3,4-ethylenedioxythiophene) and Ionic liquid Composite Film Modified Electrodes for Bisphenol A Determination
| Autor: | Jhe-Yi Wang, 汪哲毅 |
|---|---|
| Jazyk: | zh-TW |
| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 In the study, we modified a thin layer of poly (3,4-ehtylenedioxythiophene) on SPCE (screen-printed carbon electrode) by electrochemical methods, and then ionic liquid ([BMIM+][Br-]) was fabricated onto SPCE/PEDOT by spin coating. The obtained modified electrodes were further examined as electrochemical sensors for bisphenol A (BPA). Cyclic voltammetric studies showed that the SPCE/PEDOT/[BMIM+][Br-] showed enhanced oxidation current over 15 times compared to bare SPCE. In addition, a new redox couple at 0.20 V was observed following the second potential scan. The peak current of BPA decreased during the second cyclic voltammetry scanning. This is clearly evidence that the for the formation of an electroactive product of BPA on the electrode surface. The oxidized product could decrease oxidation current because of electrode poison, and modification of a layer of ionic liquid can improve the electrode activity. We used flow-injection analytical methods for the determination of BPA. A linear calibration plot was obtained for 0.1-20 μM BPA, and a sensitivity of 0.2595 μA/ μM was obtained. The detection limit was 0.025 μM (S/N = 3). The proposed SPCE/PEDOT/[BMIM+][Br-] was successfully applied to determine BPA in real sample with good recovery. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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