Development and characterization of a titanosilicate ETS-10-coated optical fiber reactor towards the photodegradation of methylene blue

Zhaoxia Ji, Dennis M. Callahan, Mariam N. Ismail, Juliusz Warzywoda, Albert Sacco

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

An optical fiber reactor (OFR) system containing uniformly distributed quartz fibers coated with titanosilicate ETS-10 crystals was investigated. Optimum ETS-10 film thickness (∼1.5 μm) and coating length (15 cm) were determined from the light propagation analysis in a single ETS-10-coated fiber. The nearly constant value of the attenuation coefficient (α ≈ 0.10 cm-1) for films with different thickness indicated uniform fiber surface coverage with these films. The extinction coefficient, ε, decreased from ∼1.6 to ∼1.0 μm-1 with ETS-10 film thickness increasing from ∼0.5 to ∼1.5 μm, which suggested less contact per unit film thickness between light and ETS-10 crystals inside thicker films, likely due to their lower crystal packing density. Photodegradation of methylene blue (MB) conducted in the OFR showed higher photocatalytic activity for thicker ETS-10 films. Although higher MB photodegradation rates were obtained at higher light intensity, the apparent quantum efficiency, Φ, decreased with increasing light intensity. This is consistent with the charge separation mechanism for MB photodegradation in the UV light range investigated. All ETS-10 samples investigated showed ∼4-5 times higher Φ values in the OFR than in the slurry reactor, likely due to the unique light/photocatalyst/reactant contact and high fiber packing density in the OFR.

Original languageEnglish
Pages (from-to)22-28
Number of pages7
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume217
Issue number1
DOIs
StatePublished - Jan 1 2011

Keywords

  • ETS-10
  • Methylene blue
  • Optical fiber reactor
  • Photocatalysis
  • Quantum efficiency
  • Titanosilicates

Fingerprint Dive into the research topics of 'Development and characterization of a titanosilicate ETS-10-coated optical fiber reactor towards the photodegradation of methylene blue'. Together they form a unique fingerprint.

Cite this