Abstract

A photocatalyst-coated optical fiber was coupled with a 318 nm ultraviolet-A light emitting diode, which activated the photocatalysts by interfacial photon-electron excitation while minimizing photonic energy losses due to conventional photocatalytic barriers. The light delivery mechanism was explored via modeling of evanescent wave energy produced upon total internal reflection and photon refraction into the TiO2 surface coating. This work explores aqueous phase LED-irradiated optical fibers for treating organic pollutants and for the first time proposes a dual-mechanistic approach to light delivery and photocatalytic performance. Degradation of a probe organic pollutant was evaluated as a function of optical fiber coating thickness, fiber length, and photocatalyst attachment method and compared against the performance of an equivalent catalyst mass in a completely mixed slurry reactor. Measured and simulated photon fluence through the optical fibers decreased as a function of fiber length, coating thickness, or TiO2 mass externally coated on the fiber. Thinner TiO2 coatings achieved faster pollutant removal rates from solution, and dip coating performed better than sol-gel attachment methods. TiO2 attached to optical fibers achieved a 5-fold higher quantum yield compared against an equivalent mass of TiO2 suspended in a slurry solution.

Original languageEnglish (US)
Pages (from-to)13319-13326
Number of pages8
JournalEnvironmental Science and Technology
Volume51
Issue number22
DOIs
StatePublished - Nov 21 2017

Fingerprint

Quantum yield
Photocatalysts
Light emitting diodes
Optical fibers
oxidation
Coatings
Oxidation
pollutant
coating
Photons
Organic pollutants
Fibers
Optical fiber coupling
organic pollutant
slurry
Refraction
Photonics
Sol-gels
Energy dissipation
pollutant removal

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Coupling Light Emitting Diodes with Photocatalyst-Coated Optical Fibers Improves Quantum Yield of Pollutant Oxidation. / Ling, Li; Tugaoen, Heather; Brame, Jonathon; Sinha, Shahnawaz; Li, Chuanhao; Schoepf, Jared; Hristovski, Kiril; Kim, Jae Hong; Shang, Chii; Westerhoff, Paul.

In: Environmental Science and Technology, Vol. 51, No. 22, 21.11.2017, p. 13319-13326.

Research output: Contribution to journalArticle

Ling, Li ; Tugaoen, Heather ; Brame, Jonathon ; Sinha, Shahnawaz ; Li, Chuanhao ; Schoepf, Jared ; Hristovski, Kiril ; Kim, Jae Hong ; Shang, Chii ; Westerhoff, Paul. / Coupling Light Emitting Diodes with Photocatalyst-Coated Optical Fibers Improves Quantum Yield of Pollutant Oxidation. In: Environmental Science and Technology. 2017 ; Vol. 51, No. 22. pp. 13319-13326.
@article{629c4ac2eacd4fa794f3da07005a6b7d,
title = "Coupling Light Emitting Diodes with Photocatalyst-Coated Optical Fibers Improves Quantum Yield of Pollutant Oxidation",
abstract = "A photocatalyst-coated optical fiber was coupled with a 318 nm ultraviolet-A light emitting diode, which activated the photocatalysts by interfacial photon-electron excitation while minimizing photonic energy losses due to conventional photocatalytic barriers. The light delivery mechanism was explored via modeling of evanescent wave energy produced upon total internal reflection and photon refraction into the TiO2 surface coating. This work explores aqueous phase LED-irradiated optical fibers for treating organic pollutants and for the first time proposes a dual-mechanistic approach to light delivery and photocatalytic performance. Degradation of a probe organic pollutant was evaluated as a function of optical fiber coating thickness, fiber length, and photocatalyst attachment method and compared against the performance of an equivalent catalyst mass in a completely mixed slurry reactor. Measured and simulated photon fluence through the optical fibers decreased as a function of fiber length, coating thickness, or TiO2 mass externally coated on the fiber. Thinner TiO2 coatings achieved faster pollutant removal rates from solution, and dip coating performed better than sol-gel attachment methods. TiO2 attached to optical fibers achieved a 5-fold higher quantum yield compared against an equivalent mass of TiO2 suspended in a slurry solution.",
author = "Li Ling and Heather Tugaoen and Jonathon Brame and Shahnawaz Sinha and Chuanhao Li and Jared Schoepf and Kiril Hristovski and Kim, {Jae Hong} and Chii Shang and Paul Westerhoff",
year = "2017",
month = "11",
day = "21",
doi = "10.1021/acs.est.7b03454",
language = "English (US)",
volume = "51",
pages = "13319--13326",
journal = "Environmental Science & Technology",
issn = "0013-936X",
publisher = "American Chemical Society",
number = "22",

}

TY - JOUR

T1 - Coupling Light Emitting Diodes with Photocatalyst-Coated Optical Fibers Improves Quantum Yield of Pollutant Oxidation

AU - Ling, Li

AU - Tugaoen, Heather

AU - Brame, Jonathon

AU - Sinha, Shahnawaz

AU - Li, Chuanhao

AU - Schoepf, Jared

AU - Hristovski, Kiril

AU - Kim, Jae Hong

AU - Shang, Chii

AU - Westerhoff, Paul

PY - 2017/11/21

Y1 - 2017/11/21

N2 - A photocatalyst-coated optical fiber was coupled with a 318 nm ultraviolet-A light emitting diode, which activated the photocatalysts by interfacial photon-electron excitation while minimizing photonic energy losses due to conventional photocatalytic barriers. The light delivery mechanism was explored via modeling of evanescent wave energy produced upon total internal reflection and photon refraction into the TiO2 surface coating. This work explores aqueous phase LED-irradiated optical fibers for treating organic pollutants and for the first time proposes a dual-mechanistic approach to light delivery and photocatalytic performance. Degradation of a probe organic pollutant was evaluated as a function of optical fiber coating thickness, fiber length, and photocatalyst attachment method and compared against the performance of an equivalent catalyst mass in a completely mixed slurry reactor. Measured and simulated photon fluence through the optical fibers decreased as a function of fiber length, coating thickness, or TiO2 mass externally coated on the fiber. Thinner TiO2 coatings achieved faster pollutant removal rates from solution, and dip coating performed better than sol-gel attachment methods. TiO2 attached to optical fibers achieved a 5-fold higher quantum yield compared against an equivalent mass of TiO2 suspended in a slurry solution.

AB - A photocatalyst-coated optical fiber was coupled with a 318 nm ultraviolet-A light emitting diode, which activated the photocatalysts by interfacial photon-electron excitation while minimizing photonic energy losses due to conventional photocatalytic barriers. The light delivery mechanism was explored via modeling of evanescent wave energy produced upon total internal reflection and photon refraction into the TiO2 surface coating. This work explores aqueous phase LED-irradiated optical fibers for treating organic pollutants and for the first time proposes a dual-mechanistic approach to light delivery and photocatalytic performance. Degradation of a probe organic pollutant was evaluated as a function of optical fiber coating thickness, fiber length, and photocatalyst attachment method and compared against the performance of an equivalent catalyst mass in a completely mixed slurry reactor. Measured and simulated photon fluence through the optical fibers decreased as a function of fiber length, coating thickness, or TiO2 mass externally coated on the fiber. Thinner TiO2 coatings achieved faster pollutant removal rates from solution, and dip coating performed better than sol-gel attachment methods. TiO2 attached to optical fibers achieved a 5-fold higher quantum yield compared against an equivalent mass of TiO2 suspended in a slurry solution.

UR - http://www.scopus.com/inward/record.url?scp=85035312183&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85035312183&partnerID=8YFLogxK

U2 - 10.1021/acs.est.7b03454

DO - 10.1021/acs.est.7b03454

M3 - Article

VL - 51

SP - 13319

EP - 13326

JO - Environmental Science & Technology

JF - Environmental Science & Technology

SN - 0013-936X

IS - 22

ER -