Characterizations of iron-rich clay modified electrodes and their applications in optical recognition

Suh Ching Shyu, Chong Mou Wang

研究成果: 雜誌貢獻文章同行評審

摘要

Optical recognition was studied with modified electrodes based on iron-rich clays. According to energy-dispersive X-ray spectroscopy (EDX), several clay minerals including montmorillonite K10 (mont. K10) contain a lot of iron. Cyclic voltammetry suggested that electrochemically active iron species exist in most iron-rich clays and are likely to reside at different sites. The associated electrochemical activity is strongly pH-dependent and photosensitive. Under UV irradiation (λ ≤ 420 nm), these iron species were activated, and a pronounced photocurrent resulted. When these electrodes were flow-injected with 2-pyridylcarboxylic acids (λab,max = 260 nm), the originally monotonic photocurrent could be modulated into a more recognizable a.c. pattern and the 260 nm optical signal became distinguishable. The photoresponse was highly reproducible, and the response time (t90) was less than 10s.

原文英語
頁(從 - 到)27-33
頁數7
期刊Journal of Electroanalytical Chemistry
440
發行號1-2
DOIs
出版狀態已發佈 - 1997 十二月 20

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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