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Bossmann SH, Göb S, Siegenthaler T, et al. An N,N'-dialkyl-4,4'-bipyridinium-modified titanium-dioxide photocatalyst for water remediation--observation and application of supramolecular effects in photocatalytic degradation of pi-donor organic compounds. Fresenius J Anal Chem. 2001;371(5):621-8doi: 10.1007/s002160100952.
Bossmann, S. H., Göb, S., Siegenthaler, T., Braun, A. M., Ranjit, K. T., & Willner, I. (2001). An N,N'-dialkyl-4,4'-bipyridinium-modified titanium-dioxide photocatalyst for water remediation--observation and application of supramolecular effects in photocatalytic degradation of pi-donor organic compounds. Fresenius' journal of analytical chemistry, 371(5), 621-8. https://doi.org/10.1007/s002160100952
Bossmann, S H, et al. "An N,N'-dialkyl-4,4'-bipyridinium-modified titanium-dioxide photocatalyst for water remediation--observation and application of supramolecular effects in photocatalytic degradation of pi-donor organic compounds." Fresenius' journal of analytical chemistry vol. 371,5 (2001): 621-8. doi: https://doi.org/10.1007/s002160100952
Bossmann SH, Göb S, Siegenthaler T, Braun AM, Ranjit KT, Willner I. An N,N'-dialkyl-4,4'-bipyridinium-modified titanium-dioxide photocatalyst for water remediation--observation and application of supramolecular effects in photocatalytic degradation of pi-donor organic compounds. Fresenius J Anal Chem. 2001 Nov;371(5):621-8. doi: 10.1007/s002160100952. PMID: 11767888.
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Fresenius J Anal Chem. 2001 Nov;371(5):621-8. doi: 10.1007/s002160100952.

An N,N'-dialkyl-4,4'-bipyridinium-modified titanium-dioxide photocatalyst for water remediation--observation and application of supramolecular effects in photocatalytic degradation of pi-donor organic compounds.

Fresenius' journal of analytical chemistry

S H Bossmann, S Göb, T Siegenthaler, A M Braun, K T Ranjit, I Willner

Affiliations

  1. Engler-Bunte-Institut, Universität Karlsruhe (TH), Lehrstuhl für Umweltmesstechnik, Germany. [email protected]

PMID: 11767888 DOI: 10.1007/s002160100952

Abstract

The photocatalytic activity of TiO2 (Degussa P-25) modified with a 4,4'-bipyridinium monolayer (V2+-TiO2) has been compared with that of conventional TiO2-P-25 by investigating the efficiency of degradation of a series of four organic model compounds with increasing pi-donor capacity (2,4-xylidine, 2,4-dimethylphenol, hydroquinone, and dimethylhydroquinone). As far as the mechanism of the first oxidation reaction is concerned, evidence for the formation of supramolecular donor-acceptor complexes with the bipyridinium units at the semiconductor surface was obtained by comparison of the Langmuir-adsorption characteristics and the efficiencies of photodegradation of the different substrates. Furthermore, the main intermediates of the photocatalytic degradation of 2,4-xylidine were identified, and the presence of 2,4-dimethylphenol indicates that the main pathway of substrate oxidation proceeds via electron transfer from the adsorbed organic substrate to the "holes" within the valence band of the photoexcited semiconductors V2+-TiO2 and TiO2. The efficiencies of photocatalytic degradation by both V2+-TiO2 and TiO2 were limited by the trapping efficiency of the conduction band electrons by molecular oxygen.

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