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A spectroelectrochemical study of chemisorption, anodic polymerization and degradation of salicylic acid on conductor and TiO2 surfaces

✍ Scribed by K. Kratochvilová; I. Hoskovcová; J. Jirkovský; J. Klíma; J. Ludvík

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
604 KB
Volume
40
Category
Article
ISSN
0013-4686

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✦ Synopsis

In situ uu-vis and SNIFTIR spectroscopy and their combination with electrochemical techniques have been used for investigation of interaction of salicylic acid (SA) with various forms of TiO, (pyrolyzed layers of TiO, and a collodial solution of TiO, Q-particles). For comparison, conductor electrodes (Pt, Au, Glassy carbon and F-doped SnO,) have been used. SA (0.01-0.1 M aqueous or acetonitrile solutions) is chemisorbed on TiO, surfaces through its carboxylic group forming C-T complexes with TiO, . Electrochemical oxidation of SA on conductor electrodes leads to a formation of an insulating layer due to anodic polymerization. A similar polymerization process has been observed on illuminated TiO, . Besides that, SA undergoes a photoanodic degradation on TiO, where formic acid as one of intermediates has been identified.

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