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- Title
CuAg nanoparticles formed in situ on electrochemically pre-anodized screen-printed carbon electrodes for the detection of nitrate and nitrite anions.
- Authors
Nai-Chang Lo; I-Wen Sun; Po-Yu Chen
- Abstract
CuAg nanoparticles (CuAgNPs) were electrochemically formed in situ on preanodized, screen-printed carbon electrodes (SPCEs) that possessed many oxygencontaining functional groups capable of adsorbing metal ions, namely Cu2+ and Ag+. Pre-anodization was achieved using continuous cyclic voltammetry in the range of potential 0.3-2.0 V under a scan rate of 50 mV/s. Cu2+ and Ag+ ions were adsorbed on the pre-anodized SPCE by immersing the electrode in solutions containing both metal ions, and then CuAgNPs were formed in situ via electrochemical reduction in a deaerated, neat NaClO4 solution after the electrode was ultrasonicated to remove physically adsorbed metal ions. Although CuNPs showed higher activity than AgNPs toward both nitrate (NO3-) and nitrite (NO2-) ions, the instability of CuNPs hindered the application, so CuAgNPs were employed to achieve a compromise between sensitivity and stability. The SPCE/anodized/CuAgNP electrodes showed activity toward the electrochemical reduction of NO3- and NO2-, respectively, with the limit of detection (LOD) of 15.6 µM (0.97 ppm) and 11.1 µM (0.51 ppm), which is sufficient to fit the allowed values (50 and 3 ppm, respectively) in drinking water as suggested by the World Health Organization (WHO).
- Subjects
SILVER nanoparticles; ELECTROCHEMISTRY; CARBON electrodes; NITRATES; ANIONS; FUNCTIONAL groups
- Publication
Journal of the Chinese Chemical Society, 2018, Vol 65, Issue 8, p982
- ISSN
0009-4536
- Publication type
Article
- DOI
10.1002/jccs.201800047