Coupling Light Emitting Diodes with Photocatalyst-Coated Optical Fibers Improves Quantum Yield of Pollutant Oxidation
| Autor: | Li Ling, Jae-Hong Kim, Kiril Hristovski, Jared Schoepf, Heather O'Neal Tugaoen, Chuanhao Li, Chii Shang, Jonathon A. Brame, Paul Westerhoff, Shahnawaz Sinha |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Optical fiber Physics::Optics 02 engineering and technology 010501 environmental sciences engineering.material 01 natural sciences Catalysis law.invention Coating law Environmental Chemistry Fiber Optical Fibers 0105 earth and related environmental sciences Titanium Total internal reflection business.industry General Chemistry 021001 nanoscience & nanotechnology Surface coating engineering Photocatalysis Optoelectronics Photonics 0210 nano-technology business Oxidation-Reduction Light-emitting diode |
| Zdroj: | Environmental Science & Technology. 51:13319-13326 |
| ISSN: | 1520-5851 0013-936X |
| Popis: | 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 thick... |
| Databáze: | OpenAIRE |
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