Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5009307 | Sensors and Actuators B: Chemical | 2017 | 24 Pages |
Abstract
Screen printing technology is widely used for the fabrication of low-cost disposable electrodes. However, this generates solid wastes that contain precious metals like platinum, which is highly polluting and quite valuable for different industries. Therefore, it is necessary to process spent platinum-containing materials to meet future demand and to protect resources. This work presents, for the first time, a procedure to recycle platinum from waste screen-printed electrodes using aqua regia as the leaching solution. Platinum from this solution was electrodeposited as nanoparticles onto the surface of screen-printed carbon electrodes (PtNPs@SPCEs) directly. PtNPs were characterized by SEM and X-ray diffraction analyses. PtNPs@SPCEs were applied as a hydrogen peroxide sensor, with similar results to those obtained with PtNPs from standard hexachloroplatinic acid solutions. With very small quantities of deposited platinum (μg), the reached sensitivity of the PtNPs@SPCEs was 687.3 nA cmâ2 μMâ1 and the limit of detection was 1.9 μM (based on a S/N ratio = 3). The sensitivity towards H2O2 was improved â¼360 times compared to commercial SPCEs, and â¼7 times compared to commercial screen-printed platinum electrodes.
Keywords
SPCEsPtNPsLSVSPESFRAElectrodepositionScreen-printed electrodesScreen-printed carbon electrodesRecyclingphosphate bufferEISLOD یا Limit of detectionHydrogen peroxide sensorElectrochemical impedance spectroscopylimit of detectionSEMscanning electron microscopePlatinum nanoparticlesS/N ratioSignal-to-noise ratioLinear sweep voltammetry
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Jerónimo Agrisuelas, MarÃa-Isabel González-Sánchez, Edelmira Valero,