Abstract

A key barrier to implementing photocatalysis is delivering light to photocatalysts that are in contact with aqueous pollutants. Slurry photocatalyst systems suffer from poor light penetration and require post-treatment to separate the catalyst. The alternative is to deposit photocatalysts on fixed films and deliver light onto the surface or the backside of the attached catalysts. In this study, TiO2-coated quartz optical fibers were coupled to light emitting diodes (OF/LED) to improve in situ light delivery. Design factors and mechanisms studied for OF/LEDs in a flow-through reactor included: (i) the influence of number of LED sources coupled to fibers and (ii) the use of multiple optical fibers bundled to a single LED. The light delivery mechanism from the optical fibers into the TiO2 coatings is thoroughly discussed. To demonstrate influence of design variables, experiments were conducted in the reactor using the chlorinated pollutant para-chlorobenzoic acid (pCBA). From the degradation kinetics of pCBA, the quantum efficiencies (Φ) of oxidation and electrical energies per order (EEO) were determined. The use of TiO2 coated optical fiber bundles reduced the energy requirements to deliver photons and increased available surface area, which improved Φ and enhanced oxidative pollutant removal performance (EEO).

LanguageEnglish (US)
Pages1331-1338
Number of pages8
JournalScience of the Total Environment
Volume613-614
DOIs
StatePublished - Feb 1 2018

Fingerprint

Water treatment
Light emitting diodes
Optical fibers
water treatment
Photocatalysts
Optical fiber coupling
catalyst
Catalysts
Quartz
Acids
Photocatalysis
pollutant removal
Quantum efficiency
pollutant
acid
Deposits
Photons
slurry
energy
reactor

Keywords

  • Advanced oxidation processes
  • Nanotechnology
  • Photocatalysis
  • Trace organics, pollutants
  • Water treatment

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

Cite this

Compact light-emitting diode optical fiber immobilized TiO2 reactor for photocatalytic water treatment. / O'Neal Tugaoen, Heather; Garcia-Segura, Sergi; Hristovski, Kiril; Westerhoff, Paul.

In: Science of the Total Environment, Vol. 613-614, 01.02.2018, p. 1331-1338.

Research output: Contribution to journalArticle

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